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* [PATCH v3 34/38] sequencer (rebase -i): show only failed cherry-picks' output
From: Johannes Schindelin @ 2017-01-02 15:35 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

This is the behavior of the shell script version of the interactive
rebase, by using the `output` function defined in `git-rebase.sh`.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sequencer.c b/sequencer.c
index a501dfce38..4f37ba8d33 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -433,6 +433,8 @@ static int do_recursive_merge(struct commit *base, struct commit *next,
 	o.ancestor = base ? base_label : "(empty tree)";
 	o.branch1 = "HEAD";
 	o.branch2 = next ? next_label : "(empty tree)";
+	if (is_rebase_i(opts))
+		o.buffer_output = 2;
 
 	head_tree = parse_tree_indirect(head);
 	next_tree = next ? next->tree : empty_tree();
@@ -444,6 +446,8 @@ static int do_recursive_merge(struct commit *base, struct commit *next,
 	clean = merge_trees(&o,
 			    head_tree,
 			    next_tree, base_tree, &result);
+	if (is_rebase_i(opts) && clean <= 0)
+		fputs(o.obuf.buf, stdout);
 	strbuf_release(&o.obuf);
 	if (clean < 0)
 		return clean;
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 31/38] sequencer: make reading author-script more elegant
From: Johannes Schindelin @ 2017-01-02 15:35 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

Rather than abusing a strbuf to come up with an environment block, let's
just use the argv_array structure which serves the same purpose much
better.

While at it, rename the function to reflect the fact that it does not
really care exactly what environment variables are defined in said file.

Suggested-by: Jeff King <peff@peff.net>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 32 +++++++++++---------------------
 1 file changed, 11 insertions(+), 21 deletions(-)

diff --git a/sequencer.c b/sequencer.c
index 41f80ea2c4..a0d0aaeaf8 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -544,18 +544,17 @@ static int write_author_script(const char *message)
 }
 
 /*
- * Read the author-script file into an environment block, ready for use in
- * run_command(), that can be free()d afterwards.
+ * Read a list of environment variable assignments (such as the author-script
+ * file) into an environment block. Returns -1 on error, 0 otherwise.
  */
-static char **read_author_script(void)
+static int read_env_script(struct argv_array *env)
 {
 	struct strbuf script = STRBUF_INIT;
 	int i, count = 0;
-	char *p, *p2, **env;
-	size_t env_size;
+	char *p, *p2;
 
 	if (strbuf_read_file(&script, rebase_path_author_script(), 256) <= 0)
-		return NULL;
+		return -1;
 
 	for (p = script.buf; *p; p++)
 		if (skip_prefix(p, "'\\\\''", (const char **)&p2))
@@ -567,19 +566,12 @@ static char **read_author_script(void)
 			count++;
 		}
 
-	env_size = (count + 1) * sizeof(*env);
-	strbuf_grow(&script, env_size);
-	memmove(script.buf + env_size, script.buf, script.len);
-	p = script.buf + env_size;
-	env = (char **)strbuf_detach(&script, NULL);
-
 	for (i = 0; i < count; i++) {
-		env[i] = p;
+		argv_array_push(env, p);
 		p += strlen(p) + 1;
 	}
-	env[count] = NULL;
 
-	return env;
+	return 0;
 }
 
 static const char staged_changes_advice[] =
@@ -612,14 +604,12 @@ static int run_git_commit(const char *defmsg, struct replay_opts *opts,
 			  int allow_empty, int edit, int amend,
 			  int cleanup_commit_message)
 {
-	char **env = NULL;
-	struct argv_array array;
+	struct argv_array env = ARGV_ARRAY_INIT, array;
 	int rc;
 	const char *value;
 
 	if (is_rebase_i(opts)) {
-		env = read_author_script();
-		if (!env) {
+		if (!read_env_script(&env)) {
 			const char *gpg_opt = gpg_sign_opt_quoted(opts);
 
 			return error(_(staged_changes_advice),
@@ -655,9 +645,9 @@ static int run_git_commit(const char *defmsg, struct replay_opts *opts,
 		argv_array_push(&array, "--allow-empty-message");
 
 	rc = run_command_v_opt_cd_env(array.argv, RUN_GIT_CMD, NULL,
-			(const char *const *)env);
+			(const char *const *)env.argv);
 	argv_array_clear(&array);
-	free(env);
+	argv_array_clear(&env);
 
 	return rc;
 }
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 33/38] sequencer (rebase -i): show only failed `git commit`'s output
From: Johannes Schindelin @ 2017-01-02 15:35 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

This is the behavior of the shell script version of the interactive
rebase, by using the `output` function defined in `git-rebase.sh`.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/sequencer.c b/sequencer.c
index c7dc5a2ad4..a501dfce38 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -610,6 +610,11 @@ static int run_git_commit(const char *defmsg, struct replay_opts *opts,
 	cmd.git_cmd = 1;
 
 	if (is_rebase_i(opts)) {
+		if (!edit) {
+			cmd.stdout_to_stderr = 1;
+			cmd.err = -1;
+		}
+
 		if (read_env_script(&cmd.env_array)) {
 			const char *gpg_opt = gpg_sign_opt_quoted(opts);
 
@@ -644,6 +649,19 @@ static int run_git_commit(const char *defmsg, struct replay_opts *opts,
 	if (opts->allow_empty_message)
 		argv_array_push(&cmd.args, "--allow-empty-message");
 
+	if (cmd.err == -1) {
+		/* hide stderr on success */
+		struct strbuf buf = STRBUF_INIT;
+		int rc = pipe_command(&cmd,
+				      NULL, 0,
+				      /* stdout is already redirected */
+				      NULL, 0,
+				      &buf, 0);
+		if (rc)
+			fputs(buf.buf, stderr);
+		strbuf_release(&buf);
+		return rc;
+	}
 
 	return run_command(&cmd);
 }
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 32/38] sequencer: use run_command() directly
From: Johannes Schindelin @ 2017-01-02 15:35 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

Instead of using the convenience function run_command_v_opt_cd_env(), we
now use the run_command() function. The former function is simply a
wrapper of the latter, trying to make it more convenient to use.

However, we already have to construct the argv and the env parameters,
and we will need even finer control e.g. over the output of the command,
so let's just stop using the convenience function.

Based on patches and suggestions by Johannes Sixt and Jeff King.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 36 ++++++++++++++++--------------------
 1 file changed, 16 insertions(+), 20 deletions(-)

diff --git a/sequencer.c b/sequencer.c
index a0d0aaeaf8..c7dc5a2ad4 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -604,12 +604,13 @@ static int run_git_commit(const char *defmsg, struct replay_opts *opts,
 			  int allow_empty, int edit, int amend,
 			  int cleanup_commit_message)
 {
-	struct argv_array env = ARGV_ARRAY_INIT, array;
-	int rc;
+	struct child_process cmd = CHILD_PROCESS_INIT;
 	const char *value;
 
+	cmd.git_cmd = 1;
+
 	if (is_rebase_i(opts)) {
-		if (!read_env_script(&env)) {
+		if (read_env_script(&cmd.env_array)) {
 			const char *gpg_opt = gpg_sign_opt_quoted(opts);
 
 			return error(_(staged_changes_advice),
@@ -617,39 +618,34 @@ static int run_git_commit(const char *defmsg, struct replay_opts *opts,
 		}
 	}
 
-	argv_array_init(&array);
-	argv_array_push(&array, "commit");
-	argv_array_push(&array, "-n");
+	argv_array_push(&cmd.args, "commit");
+	argv_array_push(&cmd.args, "-n");
 
 	if (amend)
-		argv_array_push(&array, "--amend");
+		argv_array_push(&cmd.args, "--amend");
 	if (opts->gpg_sign)
-		argv_array_pushf(&array, "-S%s", opts->gpg_sign);
+		argv_array_pushf(&cmd.args, "-S%s", opts->gpg_sign);
 	if (opts->signoff)
-		argv_array_push(&array, "-s");
+		argv_array_push(&cmd.args, "-s");
 	if (defmsg)
-		argv_array_pushl(&array, "-F", defmsg, NULL);
+		argv_array_pushl(&cmd.args, "-F", defmsg, NULL);
 	if (cleanup_commit_message)
-		argv_array_push(&array, "--cleanup=strip");
+		argv_array_push(&cmd.args, "--cleanup=strip");
 	if (edit)
-		argv_array_push(&array, "-e");
+		argv_array_push(&cmd.args, "-e");
 	else if (!cleanup_commit_message &&
 		 !opts->signoff && !opts->record_origin &&
 		 git_config_get_value("commit.cleanup", &value))
-		argv_array_push(&array, "--cleanup=verbatim");
+		argv_array_push(&cmd.args, "--cleanup=verbatim");
 
 	if (allow_empty)
-		argv_array_push(&array, "--allow-empty");
+		argv_array_push(&cmd.args, "--allow-empty");
 
 	if (opts->allow_empty_message)
-		argv_array_push(&array, "--allow-empty-message");
+		argv_array_push(&cmd.args, "--allow-empty-message");
 
-	rc = run_command_v_opt_cd_env(array.argv, RUN_GIT_CMD, NULL,
-			(const char *const *)env.argv);
-	argv_array_clear(&array);
-	argv_array_clear(&env);
 
-	return rc;
+	return run_command(&cmd);
 }
 
 static int is_original_commit_empty(struct commit *commit)
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 30/38] sequencer (rebase -i): differentiate between comments and 'noop'
From: Johannes Schindelin @ 2017-01-02 15:34 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

In the upcoming patch, we will support rebase -i's progress
reporting. The progress skips comments but counts 'noop's.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/sequencer.c b/sequencer.c
index 6e92f186ae..41f80ea2c4 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -737,7 +737,9 @@ enum todo_command {
 	TODO_EXEC,
 	/* commands that do nothing but are counted for reporting progress */
 	TODO_NOOP,
-	TODO_DROP
+	TODO_DROP,
+	/* comments (not counted for reporting progress) */
+	TODO_COMMENT
 };
 
 static struct {
@@ -752,12 +754,13 @@ static struct {
 	{ 's', "squash" },
 	{ 'x', "exec" },
 	{ 0,   "noop" },
-	{ 'd', "drop" }
+	{ 'd', "drop" },
+	{ 0,   NULL }
 };
 
 static const char *command_to_string(const enum todo_command command)
 {
-	if ((size_t)command < ARRAY_SIZE(todo_command_info))
+	if (command < TODO_COMMENT)
 		return todo_command_info[command].str;
 	die("Unknown command: %d", command);
 }
@@ -1198,14 +1201,14 @@ static int parse_insn_line(struct todo_item *item, const char *bol, char *eol)
 	bol += strspn(bol, " \t");
 
 	if (bol == eol || *bol == '\r' || *bol == comment_line_char) {
-		item->command = TODO_NOOP;
+		item->command = TODO_COMMENT;
 		item->commit = NULL;
 		item->arg = bol;
 		item->arg_len = eol - bol;
 		return 0;
 	}
 
-	for (i = 0; i < ARRAY_SIZE(todo_command_info); i++)
+	for (i = 0; i < TODO_COMMENT; i++)
 		if (skip_prefix(bol, todo_command_info[i].str, &bol)) {
 			item->command = i;
 			break;
@@ -1214,7 +1217,7 @@ static int parse_insn_line(struct todo_item *item, const char *bol, char *eol)
 			item->command = i;
 			break;
 		}
-	if (i >= ARRAY_SIZE(todo_command_info))
+	if (i >= TODO_COMMENT)
 		return -1;
 
 	if (item->command == TODO_NOOP) {
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 29/38] sequencer (rebase -i): implement the 'drop' command
From: Johannes Schindelin @ 2017-01-02 15:34 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

The parsing part of a 'drop' command is almost identical to parsing a
'pick', while the operation is the same as that of a 'noop'.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/sequencer.c b/sequencer.c
index dd5b843a84..6e92f186ae 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -736,7 +736,8 @@ enum todo_command {
 	/* commands that do something else than handling a single commit */
 	TODO_EXEC,
 	/* commands that do nothing but are counted for reporting progress */
-	TODO_NOOP
+	TODO_NOOP,
+	TODO_DROP
 };
 
 static struct {
@@ -750,7 +751,8 @@ static struct {
 	{ 'f', "fixup" },
 	{ 's', "squash" },
 	{ 'x', "exec" },
-	{ 0,   "noop" }
+	{ 0,   "noop" },
+	{ 'd', "drop" }
 };
 
 static const char *command_to_string(const enum todo_command command)
@@ -762,7 +764,7 @@ static const char *command_to_string(const enum todo_command command)
 
 static int is_noop(const enum todo_command command)
 {
-	return TODO_NOOP <= (size_t)command;
+	return TODO_NOOP <= command;
 }
 
 static int is_fixup(enum todo_command command)
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* Re: [PATCH 14/17] sha1_file: introduce an nth_packed_object_oid function
From: Michael Haggerty @ 2017-01-02 15:30 UTC (permalink / raw)
  To: brian m. carlson, git; +Cc: Jeff King
In-Reply-To: <20170101191847.564741-15-sandals@crustytoothpaste.net>

On 01/01/2017 08:18 PM, brian m. carlson wrote:
> There are places in the code where we would like to provide a struct
> object_id *, yet read the hash directly from the pack.  Provide an
> nth_packed_object_oid function that mirrors the nth_packed_object_sha1
> function.
> 
> The required cast is questionable, but should be safe on all known
> platforms.  The alternative of allocating an object as an intermediate
> would be too inefficient and cause memory leaks.  If necessary, an
> intermediate union could be used; this practice is allowed by GCC and
> explicitly sanctioned by C11.  However, such a change will likely not be
> necessary, and can be made if and when it is.

I have the feeling that this design decision has been discussed on the
mailing list. If so, could you include a URL here?

The obvious alternative to allocating a new object to return to the
caller would be to have the caller of `nth_packed_object_oid()` pass a
`struct object_id *` argument to be filled in (by copying the hash into
it). Aside from being legal C, this would also be a more robust step
towards a post-SHA-1 world, where the suggested hack wouldn't work.

Of course, the question is what the callers want to do with the
`object_id`. Are the return values of `nth_packed_object_sha1()` stored
to other longer-lived structures that rely on the lifetime of the
packfile mmap to keep the value valid? If so, then keeping track of the
lifetime of the `struct object_id` could be a big chore, not to mention
that needing to keep a 20-byte `struct object_id` around rather than a
8- or 4-byte pointer would also cost more RAM.

As you probably can tell, I'm not psyched about straying outside of
legal C. It would be nice to see more justification.

> [...]

Michael


^ permalink raw reply

* [PATCH v3 28/38] sequencer (rebase -i): allow rescheduling commands
From: Johannes Schindelin @ 2017-01-02 15:28 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

The interactive rebase has the very special magic that a cherry-pick
that exits with a status different from 0 and 1 signifies a failure to
even record that a cherry-pick was started.

This can happen e.g. when a fast-forward fails because it would
overwrite untracked files.

In that case, we must reschedule the command that we thought we already
had at least started successfully.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sequencer.c b/sequencer.c
index 04a64cf0dc..dd5b843a84 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -1915,6 +1915,12 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 					1);
 			res = do_pick_commit(item->command, item->commit,
 					opts, is_final_fixup(todo_list));
+			if (is_rebase_i(opts) && res < 0) {
+				/* Reschedule */
+				todo_list->current--;
+				if (save_todo(todo_list, opts))
+					return -1;
+			}
 			if (item->command == TODO_EDIT) {
 				struct commit *commit = item->commit;
 				if (!res)
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 27/38] sequencer (rebase -i): respect strategy/strategy_opts settings
From: Johannes Schindelin @ 2017-01-02 15:28 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

The sequencer already has an idea about using different merge
strategies. We just piggy-back on top of that, using rebase -i's
own settings, when running the sequencer in interactive rebase mode.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/sequencer.c b/sequencer.c
index 06f7cebe48..04a64cf0dc 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -114,6 +114,8 @@ static GIT_PATH_FUNC(rebase_path_verbose, "rebase-merge/verbose")
 static GIT_PATH_FUNC(rebase_path_head_name, "rebase-merge/head-name")
 static GIT_PATH_FUNC(rebase_path_onto, "rebase-merge/onto")
 static GIT_PATH_FUNC(rebase_path_autostash, "rebase-merge/autostash")
+static GIT_PATH_FUNC(rebase_path_strategy, "rebase-merge/strategy")
+static GIT_PATH_FUNC(rebase_path_strategy_opts, "rebase-merge/strategy_opts")
 
 static inline int is_rebase_i(const struct replay_opts *opts)
 {
@@ -1368,6 +1370,26 @@ static int populate_opts_cb(const char *key, const char *value, void *data)
 	return 0;
 }
 
+static void read_strategy_opts(struct replay_opts *opts, struct strbuf *buf)
+{
+	int i;
+
+	strbuf_reset(buf);
+	if (!read_oneliner(buf, rebase_path_strategy(), 0))
+		return;
+	opts->strategy = strbuf_detach(buf, NULL);
+	if (!read_oneliner(buf, rebase_path_strategy_opts(), 0))
+		return;
+
+	opts->xopts_nr = split_cmdline(buf->buf, (const char ***)&opts->xopts);
+	for (i = 0; i < opts->xopts_nr; i++) {
+		const char *arg = opts->xopts[i];
+
+		skip_prefix(arg, "--", &arg);
+		opts->xopts[i] = xstrdup(arg);
+	}
+}
+
 static int read_populate_opts(struct replay_opts *opts)
 {
 	if (is_rebase_i(opts)) {
@@ -1381,11 +1403,13 @@ static int read_populate_opts(struct replay_opts *opts)
 				opts->gpg_sign = xstrdup(buf.buf + 2);
 			}
 		}
-		strbuf_release(&buf);
 
 		if (file_exists(rebase_path_verbose()))
 			opts->verbose = 1;
 
+		read_strategy_opts(opts, &buf);
+		strbuf_release(&buf);
+
 		return 0;
 	}
 
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 26/38] sequencer (rebase -i): respect the rebase.autostash setting
From: Johannes Schindelin @ 2017-01-02 15:28 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

Git's `rebase` command inspects the `rebase.autostash` config setting
to determine whether it should stash any uncommitted changes before
rebasing and re-apply them afterwards.

As we introduce more bits and pieces to let the sequencer act as
interactive rebase's backend, here is the part that adds support for
the autostash feature.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/sequencer.c b/sequencer.c
index 43ced8db31..06f7cebe48 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -113,6 +113,7 @@ static GIT_PATH_FUNC(rebase_path_orig_head, "rebase-merge/orig-head")
 static GIT_PATH_FUNC(rebase_path_verbose, "rebase-merge/verbose")
 static GIT_PATH_FUNC(rebase_path_head_name, "rebase-merge/head-name")
 static GIT_PATH_FUNC(rebase_path_onto, "rebase-merge/onto")
+static GIT_PATH_FUNC(rebase_path_autostash, "rebase-merge/autostash")
 
 static inline int is_rebase_i(const struct replay_opts *opts)
 {
@@ -1801,6 +1802,47 @@ static enum todo_command peek_command(struct todo_list *todo_list, int offset)
 	return -1;
 }
 
+static int apply_autostash(struct replay_opts *opts)
+{
+	struct strbuf stash_sha1 = STRBUF_INIT;
+	struct child_process child = CHILD_PROCESS_INIT;
+	int ret = 0;
+
+	if (!read_oneliner(&stash_sha1, rebase_path_autostash(), 1)) {
+		strbuf_release(&stash_sha1);
+		return 0;
+	}
+	strbuf_trim(&stash_sha1);
+
+	child.git_cmd = 1;
+	argv_array_push(&child.args, "stash");
+	argv_array_push(&child.args, "apply");
+	argv_array_push(&child.args, stash_sha1.buf);
+	if (!run_command(&child))
+		printf(_("Applied autostash."));
+	else {
+		struct child_process store = CHILD_PROCESS_INIT;
+
+		store.git_cmd = 1;
+		argv_array_push(&store.args, "stash");
+		argv_array_push(&store.args, "store");
+		argv_array_push(&store.args, "-m");
+		argv_array_push(&store.args, "autostash");
+		argv_array_push(&store.args, "-q");
+		argv_array_push(&store.args, stash_sha1.buf);
+		if (run_command(&store))
+			ret = error(_("cannot store %s"), stash_sha1.buf);
+		else
+			printf(_("Applying autostash resulted in conflicts.\n"
+				"Your changes are safe in the stash.\n"
+				"You can run \"git stash pop\" or"
+				" \"git stash drop\" at any time.\n"));
+	}
+
+	strbuf_release(&stash_sha1);
+	return ret;
+}
+
 static const char *reflog_message(struct replay_opts *opts,
 	const char *sub_action, const char *fmt, ...)
 {
@@ -1980,6 +2022,7 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 				run_command(&hook);
 			}
 		}
+		apply_autostash(opts);
 
 		strbuf_release(&buf);
 		strbuf_release(&head_ref);
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 22/38] sequencer (rebase -i): set the reflog message consistently
From: Johannes Schindelin @ 2017-01-02 15:28 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

We already used the same reflog message as the scripted version of rebase
-i when finishing. With this commit, we do that also for all the commands
before that.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sequencer.c b/sequencer.c
index 0d8e11f580..95ae4bcd1e 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -1785,6 +1785,10 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 			unlink(rebase_path_amend());
 		}
 		if (item->command <= TODO_SQUASH) {
+			if (is_rebase_i(opts))
+				setenv("GIT_REFLOG_ACTION", reflog_message(opts,
+					command_to_string(item->command), NULL),
+					1);
 			res = do_pick_commit(item->command, item->commit,
 					opts, is_final_fixup(todo_list));
 			if (item->command == TODO_EDIT) {
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 25/38] sequencer (rebase -i): run the post-rewrite hook, if needed
From: Johannes Schindelin @ 2017-01-02 15:28 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/sequencer.c b/sequencer.c
index d7273fd1b3..43ced8db31 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -1957,6 +1957,8 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 		if (!stat(rebase_path_rewritten_list(), &st) &&
 				st.st_size > 0) {
 			struct child_process child = CHILD_PROCESS_INIT;
+			const char *post_rewrite_hook =
+				find_hook("post-rewrite");
 
 			child.in = open(rebase_path_rewritten_list(), O_RDONLY);
 			child.git_cmd = 1;
@@ -1965,6 +1967,18 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 			argv_array_push(&child.args, "--for-rewrite=rebase");
 			/* we don't care if this copying failed */
 			run_command(&child);
+
+			if (post_rewrite_hook) {
+				struct child_process hook = CHILD_PROCESS_INIT;
+
+				hook.in = open(rebase_path_rewritten_list(),
+					O_RDONLY);
+				hook.stdout_to_stderr = 1;
+				argv_array_push(&hook.args, post_rewrite_hook);
+				argv_array_push(&hook.args, "rebase");
+				/* we don't care if this hook failed */
+				run_command(&hook);
+			}
 		}
 
 		strbuf_release(&buf);
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 24/38] sequencer (rebase -i): record interrupted commits in rewritten, too
From: Johannes Schindelin @ 2017-01-02 15:28 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

When continuing after a `pick` command failed, we want that commit
to show up in the rewritten-list (and its notes to be rewritten), too.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sequencer.c b/sequencer.c
index 50380a15b8..d7273fd1b3 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -2060,6 +2060,14 @@ int sequencer_continue(struct replay_opts *opts)
 			goto release_todo_list;
 		}
 		todo_list.current++;
+	} else if (file_exists(rebase_path_stopped_sha())) {
+		struct strbuf buf = STRBUF_INIT;
+		struct object_id oid;
+
+		if (read_oneliner(&buf, rebase_path_stopped_sha(), 1) &&
+		    !get_sha1_committish(buf.buf, oid.hash))
+			record_in_rewritten(&oid, peek_command(&todo_list, 0));
+		strbuf_release(&buf);
 	}
 
 	res = pick_commits(&todo_list, opts);
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 20/38] sequencer (rebase -i): allow fast-forwarding for edit/reword
From: Johannes Schindelin @ 2017-01-02 15:28 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

The sequencer already knew how to fast-forward instead of
cherry-picking, if possible.

We want to continue to do this, of course, but in case of the 'reword'
command, we will need to call `git commit` after fast-forwarding.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/sequencer.c b/sequencer.c
index 50e998acc4..23161f593e 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -860,7 +860,7 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
 	const char *base_label, *next_label;
 	struct commit_message msg = { NULL, NULL, NULL, NULL };
 	struct strbuf msgbuf = STRBUF_INIT;
-	int res, unborn = 0, amend = 0, allow;
+	int res, unborn = 0, amend = 0, allow = 0;
 
 	if (opts->no_commit) {
 		/*
@@ -905,11 +905,23 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
 	else
 		parent = commit->parents->item;
 
+	if (get_message(commit, &msg) != 0)
+		return error(_("cannot get commit message for %s"),
+			oid_to_hex(&commit->object.oid));
+
 	if (opts->allow_ff && !is_fixup(command) &&
 	    ((parent && !hashcmp(parent->object.oid.hash, head)) ||
-	     (!parent && unborn)))
-		return fast_forward_to(commit->object.oid.hash, head, unborn, opts);
-
+	     (!parent && unborn))) {
+		if (is_rebase_i(opts))
+			write_author_script(msg.message);
+		res = fast_forward_to(commit->object.oid.hash, head, unborn,
+			opts);
+		if (res || command != TODO_REWORD)
+			goto leave;
+		edit = amend = 1;
+		msg_file = NULL;
+		goto fast_forward_edit;
+	}
 	if (parent && parse_commit(parent) < 0)
 		/* TRANSLATORS: The first %s will be a "todo" command like
 		   "revert" or "pick", the second %s a SHA1. */
@@ -917,10 +929,6 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
 			command_to_string(command),
 			oid_to_hex(&parent->object.oid));
 
-	if (get_message(commit, &msg) != 0)
-		return error(_("cannot get commit message for %s"),
-			oid_to_hex(&commit->object.oid));
-
 	/*
 	 * "commit" is an existing commit.  We would want to apply
 	 * the difference it introduces since its first parent "prev"
@@ -1044,6 +1052,7 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
 		goto leave;
 	}
 	if (!opts->no_commit)
+fast_forward_edit:
 		res = run_git_commit(msg_file, opts, allow, edit, amend,
 				     cleanup_commit_message);
 
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 23/38] sequencer (rebase -i): copy commit notes at end
From: Johannes Schindelin @ 2017-01-02 15:28 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

When rebasing commits that have commit notes attached, the interactive
rebase rewrites those notes faithfully at the end. The sequencer must
do this, too, if it wishes to do interactive rebase's job.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)

diff --git a/sequencer.c b/sequencer.c
index 95ae4bcd1e..50380a15b8 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -96,6 +96,15 @@ static GIT_PATH_FUNC(rebase_path_amend, "rebase-merge/amend")
  */
 static GIT_PATH_FUNC(rebase_path_stopped_sha, "rebase-merge/stopped-sha")
 /*
+ * For the post-rewrite hook, we make a list of rewritten commits and
+ * their new sha1s.  The rewritten-pending list keeps the sha1s of
+ * commits that have been processed, but not committed yet,
+ * e.g. because they are waiting for a 'squash' command.
+ */
+static GIT_PATH_FUNC(rebase_path_rewritten_list, "rebase-merge/rewritten-list")
+static GIT_PATH_FUNC(rebase_path_rewritten_pending,
+	"rebase-merge/rewritten-pending")
+/*
  * The following files are written by git-rebase just after parsing the
  * command-line (and are only consumed, not modified, by the sequencer).
  */
@@ -850,6 +859,44 @@ static int update_squash_messages(enum todo_command command,
 	return res;
 }
 
+static void flush_rewritten_pending(void) {
+	struct strbuf buf = STRBUF_INIT;
+	unsigned char newsha1[20];
+	FILE *out;
+
+	if (strbuf_read_file(&buf, rebase_path_rewritten_pending(), 82) > 0 &&
+			!get_sha1("HEAD", newsha1) &&
+			(out = fopen(rebase_path_rewritten_list(), "a"))) {
+		char *bol = buf.buf, *eol;
+
+		while (*bol) {
+			eol = strchrnul(bol, '\n');
+			fprintf(out, "%.*s %s\n", (int)(eol - bol),
+					bol, sha1_to_hex(newsha1));
+			if (!*eol)
+				break;
+			bol = eol + 1;
+		}
+		fclose(out);
+		unlink(rebase_path_rewritten_pending());
+	}
+	strbuf_release(&buf);
+}
+
+static void record_in_rewritten(struct object_id *oid,
+		enum todo_command next_command) {
+	FILE *out = fopen(rebase_path_rewritten_pending(), "a");
+
+	if (!out)
+		return;
+
+	fprintf(out, "%s\n", oid_to_hex(oid));
+	fclose(out);
+
+	if (!is_fixup(next_command))
+		flush_rewritten_pending();
+}
+
 static int do_pick_commit(enum todo_command command, struct commit *commit,
 		struct replay_opts *opts, int final_fixup)
 {
@@ -1743,6 +1790,17 @@ static int is_final_fixup(struct todo_list *todo_list)
 	return 1;
 }
 
+static enum todo_command peek_command(struct todo_list *todo_list, int offset)
+{
+	int i;
+
+	for (i = todo_list->current + offset; i < todo_list->nr; i++)
+		if (!is_noop(todo_list->items[i].command))
+			return todo_list->items[i].command;
+
+	return -1;
+}
+
 static const char *reflog_message(struct replay_opts *opts,
 	const char *sub_action, const char *fmt, ...)
 {
@@ -1801,6 +1859,9 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 					item->arg, item->arg_len, opts, res,
 					!res);
 			}
+			if (is_rebase_i(opts) && !res)
+				record_in_rewritten(&item->commit->object.oid,
+					peek_command(todo_list, 1));
 			if (res && is_fixup(item->command)) {
 				if (res == 1)
 					intend_to_amend();
@@ -1827,6 +1888,7 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 
 	if (is_rebase_i(opts)) {
 		struct strbuf head_ref = STRBUF_INIT, buf = STRBUF_INIT;
+		struct stat st;
 
 		/* Stopped in the middle, as planned? */
 		if (todo_list->current < todo_list->nr)
@@ -1891,6 +1953,20 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 				log_tree_diff_flush(&log_tree_opt);
 			}
 		}
+		flush_rewritten_pending();
+		if (!stat(rebase_path_rewritten_list(), &st) &&
+				st.st_size > 0) {
+			struct child_process child = CHILD_PROCESS_INIT;
+
+			child.in = open(rebase_path_rewritten_list(), O_RDONLY);
+			child.git_cmd = 1;
+			argv_array_push(&child.args, "notes");
+			argv_array_push(&child.args, "copy");
+			argv_array_push(&child.args, "--for-rewrite=rebase");
+			/* we don't care if this copying failed */
+			run_command(&child);
+		}
+
 		strbuf_release(&buf);
 		strbuf_release(&head_ref);
 	}
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 21/38] sequencer (rebase -i): refactor setting the reflog message
From: Johannes Schindelin @ 2017-01-02 15:28 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

This makes the code DRYer, with the obvious benefit that we can enhance
the code further in a single place.

We can also reuse the functionality elsewhere by calling this new
function.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 33 ++++++++++++++++++++++++++-------
 1 file changed, 26 insertions(+), 7 deletions(-)

diff --git a/sequencer.c b/sequencer.c
index 23161f593e..0d8e11f580 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -1743,6 +1743,26 @@ static int is_final_fixup(struct todo_list *todo_list)
 	return 1;
 }
 
+static const char *reflog_message(struct replay_opts *opts,
+	const char *sub_action, const char *fmt, ...)
+{
+	va_list ap;
+	static struct strbuf buf = STRBUF_INIT;
+
+	va_start(ap, fmt);
+	strbuf_reset(&buf);
+	strbuf_addstr(&buf, action_name(opts));
+	if (sub_action)
+		strbuf_addf(&buf, " (%s)", sub_action);
+	if (fmt) {
+		strbuf_addstr(&buf, ": ");
+		strbuf_vaddf(&buf, fmt, ap);
+	}
+	va_end(ap);
+
+	return buf.buf;
+}
+
 static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 {
 	int res = 0;
@@ -1810,6 +1830,7 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 
 		if (read_oneliner(&head_ref, rebase_path_head_name(), 0) &&
 				starts_with(head_ref.buf, "refs/")) {
+			const char *msg;
 			unsigned char head[20], orig[20];
 			int res;
 
@@ -1825,23 +1846,21 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 				res = error(_("could not read orig-head"));
 				goto cleanup_head_ref;
 			}
-			strbuf_addf(&buf, "rebase -i (finish): %s onto ",
-				head_ref.buf);
 			if (!read_oneliner(&buf, rebase_path_onto(), 0)) {
 				res = error(_("could not read 'onto'"));
 				goto cleanup_head_ref;
 			}
-			if (update_ref(buf.buf, head_ref.buf, head, orig,
+			msg = reflog_message(opts, "finish", "%s onto %s",
+				head_ref.buf, buf.buf);
+			if (update_ref(msg, head_ref.buf, head, orig,
 					REF_NODEREF, UPDATE_REFS_MSG_ON_ERR)) {
 				res = error(_("could not update %s"),
 					head_ref.buf);
 				goto cleanup_head_ref;
 			}
-			strbuf_reset(&buf);
-			strbuf_addf(&buf,
-				"rebase -i (finish): returning to %s",
+			msg = reflog_message(opts, "finish", "returning to %s",
 				head_ref.buf);
-			if (create_symref("HEAD", head_ref.buf, buf.buf)) {
+			if (create_symref("HEAD", head_ref.buf, msg)) {
 				res = error(_("could not update HEAD to %s"),
 					head_ref.buf);
 				goto cleanup_head_ref;
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 19/38] sequencer (rebase -i): implement the 'reword' command
From: Johannes Schindelin @ 2017-01-02 15:28 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

This is now trivial, as all the building blocks are in place: all we need
to do is to flip the "edit" switch when committing.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/sequencer.c b/sequencer.c
index a2002f1c12..50e998acc4 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -718,6 +718,7 @@ enum todo_command {
 	TODO_PICK = 0,
 	TODO_REVERT,
 	TODO_EDIT,
+	TODO_REWORD,
 	TODO_FIXUP,
 	TODO_SQUASH,
 	/* commands that do something else than handling a single commit */
@@ -733,6 +734,7 @@ static struct {
 	{ 'p', "pick" },
 	{ 0,   "revert" },
 	{ 'e', "edit" },
+	{ 'r', "reword" },
 	{ 'f', "fixup" },
 	{ 's', "squash" },
 	{ 'x', "exec" },
@@ -962,7 +964,9 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
 		}
 	}
 
-	if (is_fixup(command)) {
+	if (command == TODO_REWORD)
+		edit = 1;
+	else if (is_fixup(command)) {
 		if (update_squash_messages(command, commit, opts))
 			return -1;
 		amend = 1;
@@ -1771,7 +1775,8 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 					item->arg_len, item->arg);
 			} else if (res && is_rebase_i(opts))
 				return res | error_with_patch(item->commit,
-					item->arg, item->arg_len, opts, res, 0);
+					item->arg, item->arg_len, opts, res,
+					item->command == TODO_REWORD);
 		} else if (item->command == TODO_EXEC) {
 			char *end_of_arg = (char *)(item->arg + item->arg_len);
 			int saved = *end_of_arg;
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 17/38] sequencer (rebase -i): update refs after a successful rebase
From: Johannes Schindelin @ 2017-01-02 15:27 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

An interactive rebase operates on a detached HEAD (to keep the reflog
of the original branch relatively clean), and updates the branch only
at the end.

Now that the sequencer learns to perform interactive rebases, it also
needs to learn the trick to update the branch before removing the
directory containing the state of the interactive rebase.

We introduce a new head_ref variable in a wider scope than necessary at
the moment, to allow for a later patch that prints out "Successfully
rebased and updated <ref>".

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 46 +++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 45 insertions(+), 1 deletion(-)

diff --git a/sequencer.c b/sequencer.c
index 6a840216b1..80b2b2a975 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -102,6 +102,8 @@ static GIT_PATH_FUNC(rebase_path_stopped_sha, "rebase-merge/stopped-sha")
 static GIT_PATH_FUNC(rebase_path_gpg_sign_opt, "rebase-merge/gpg_sign_opt")
 static GIT_PATH_FUNC(rebase_path_orig_head, "rebase-merge/orig-head")
 static GIT_PATH_FUNC(rebase_path_verbose, "rebase-merge/verbose")
+static GIT_PATH_FUNC(rebase_path_head_name, "rebase-merge/head-name")
+static GIT_PATH_FUNC(rebase_path_onto, "rebase-merge/onto")
 
 static inline int is_rebase_i(const struct replay_opts *opts)
 {
@@ -1784,12 +1786,53 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 	}
 
 	if (is_rebase_i(opts)) {
-		struct strbuf buf = STRBUF_INIT;
+		struct strbuf head_ref = STRBUF_INIT, buf = STRBUF_INIT;
 
 		/* Stopped in the middle, as planned? */
 		if (todo_list->current < todo_list->nr)
 			return 0;
 
+		if (read_oneliner(&head_ref, rebase_path_head_name(), 0) &&
+				starts_with(head_ref.buf, "refs/")) {
+			unsigned char head[20], orig[20];
+			int res;
+
+			if (get_sha1("HEAD", head)) {
+				res = error(_("cannot read HEAD"));
+cleanup_head_ref:
+				strbuf_release(&head_ref);
+				strbuf_release(&buf);
+				return res;
+			}
+			if (!read_oneliner(&buf, rebase_path_orig_head(), 0) ||
+					get_sha1_hex(buf.buf, orig)) {
+				res = error(_("could not read orig-head"));
+				goto cleanup_head_ref;
+			}
+			strbuf_addf(&buf, "rebase -i (finish): %s onto ",
+				head_ref.buf);
+			if (!read_oneliner(&buf, rebase_path_onto(), 0)) {
+				res = error(_("could not read 'onto'"));
+				goto cleanup_head_ref;
+			}
+			if (update_ref(buf.buf, head_ref.buf, head, orig,
+					REF_NODEREF, UPDATE_REFS_MSG_ON_ERR)) {
+				res = error(_("could not update %s"),
+					head_ref.buf);
+				goto cleanup_head_ref;
+			}
+			strbuf_reset(&buf);
+			strbuf_addf(&buf,
+				"rebase -i (finish): returning to %s",
+				head_ref.buf);
+			if (create_symref("HEAD", head_ref.buf, buf.buf)) {
+				res = error(_("could not update HEAD to %s"),
+					head_ref.buf);
+				goto cleanup_head_ref;
+			}
+			strbuf_reset(&buf);
+		}
+
 		if (opts->verbose) {
 			struct rev_info log_tree_opt;
 			struct object_id orig, head;
@@ -1810,6 +1853,7 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 			}
 		}
 		strbuf_release(&buf);
+		strbuf_release(&head_ref);
 	}
 
 	/*
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 18/38] sequencer (rebase -i): leave a patch upon error
From: Johannes Schindelin @ 2017-01-02 15:27 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

When doing an interactive rebase, we want to leave a 'patch' file for
further inspection by the user (even if we never tried to actually apply
that patch, since we're cherry-picking instead).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sequencer.c b/sequencer.c
index 80b2b2a975..a2002f1c12 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -1769,7 +1769,9 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 					intend_to_amend();
 				return error_failed_squash(item->commit, opts,
 					item->arg_len, item->arg);
-			}
+			} else if (res && is_rebase_i(opts))
+				return res | error_with_patch(item->commit,
+					item->arg, item->arg_len, opts, res, 0);
 		} else if (item->command == TODO_EXEC) {
 			char *end_of_arg = (char *)(item->arg + item->arg_len);
 			int saved = *end_of_arg;
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 16/38] sequencer (rebase -i): the todo can be empty when continuing
From: Johannes Schindelin @ 2017-01-02 15:27 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

When the last command of an interactive rebase fails, the user needs to
resolve the problem and then continue the interactive rebase. Naturally,
the todo script is empty by then. So let's not complain about that!

To that end, let's move that test out of the function that parses the
todo script, and into the more high-level function read_populate_todo().
This is also necessary by now because the lower-level parse_insn_buffer()
has no idea whether we are performing an interactive rebase or not.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/sequencer.c b/sequencer.c
index a7b9ee0d04..6a840216b1 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -1215,8 +1215,7 @@ static int parse_insn_buffer(char *buf, struct todo_list *todo_list)
 		else if (!is_noop(item->command))
 			fixup_okay = 1;
 	}
-	if (!todo_list->nr)
-		return error(_("no commits parsed."));
+
 	return res;
 }
 
@@ -1240,6 +1239,10 @@ static int read_populate_todo(struct todo_list *todo_list,
 	if (res)
 		return error(_("unusable instruction sheet: '%s'"), todo_file);
 
+	if (!todo_list->nr &&
+	    (!is_rebase_i(opts) || !file_exists(rebase_path_done())))
+		return error(_("no commits parsed."));
+
 	if (!is_rebase_i(opts)) {
 		enum todo_command valid =
 			opts->action == REPLAY_PICK ? TODO_PICK : TODO_REVERT;
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 13/38] sequencer (rebase -i): allow continuing with staged changes
From: Johannes Schindelin @ 2017-01-02 15:27 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

When an interactive rebase is interrupted, the user may stage changes
before continuing, and we need to commit those changes in that case.

Please note that the nested "if" added to the sequencer_continue() is
not combined into a single "if" because it will be extended with an
"else" clause in a later patch in this patch series.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/sequencer.c b/sequencer.c
index 9913882603..69301fecc6 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -1826,6 +1826,42 @@ static int continue_single_pick(void)
 	return run_command_v_opt(argv, RUN_GIT_CMD);
 }
 
+static int commit_staged_changes(struct replay_opts *opts)
+{
+	int amend = 0;
+
+	if (has_unstaged_changes(1))
+		return error(_("cannot rebase: You have unstaged changes."));
+	if (!has_uncommitted_changes(0))
+		return 0;
+
+	if (file_exists(rebase_path_amend())) {
+		struct strbuf rev = STRBUF_INIT;
+		unsigned char head[20], to_amend[20];
+
+		if (get_sha1("HEAD", head))
+			return error(_("cannot amend non-existing commit"));
+		if (!read_oneliner(&rev, rebase_path_amend(), 0))
+			return error(_("invalid file: '%s'"), rebase_path_amend());
+		if (get_sha1_hex(rev.buf, to_amend))
+			return error(_("invalid contents: '%s'"),
+				rebase_path_amend());
+		if (hashcmp(head, to_amend))
+			return error(_("\nYou have uncommitted changes in your "
+				       "working tree. Please, commit them\n"
+				       "first and then run 'git rebase "
+				       "--continue' again."));
+
+		strbuf_release(&rev);
+		amend = 1;
+	}
+
+	if (run_git_commit(rebase_path_message(), opts, 1, 1, amend, 0))
+		return error(_("could not commit staged changes."));
+	unlink(rebase_path_amend());
+	return 0;
+}
+
 int sequencer_continue(struct replay_opts *opts)
 {
 	struct todo_list todo_list = TODO_LIST_INIT;
@@ -1834,6 +1870,10 @@ int sequencer_continue(struct replay_opts *opts)
 	if (read_and_refresh_cache(opts))
 		return -1;
 
+	if (is_rebase_i(opts)) {
+		if (commit_staged_changes(opts))
+			return -1;
+	}
 	if (!file_exists(get_todo_path(opts)))
 		return continue_single_pick();
 	if (read_populate_opts(opts))
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 14/38] sequencer (rebase -i): remove CHERRY_PICK_HEAD when no longer needed
From: Johannes Schindelin @ 2017-01-02 15:27 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

The scripted version of the interactive rebase already does that.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/sequencer.c b/sequencer.c
index 69301fecc6..52e17c8887 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -1832,8 +1832,13 @@ static int commit_staged_changes(struct replay_opts *opts)
 
 	if (has_unstaged_changes(1))
 		return error(_("cannot rebase: You have unstaged changes."));
-	if (!has_uncommitted_changes(0))
+	if (!has_uncommitted_changes(0)) {
+		const char *cherry_pick_head = git_path("CHERRY_PICK_HEAD");
+
+		if (file_exists(cherry_pick_head) && unlink(cherry_pick_head))
+			return error(_("could not remove CHERRY_PICK_HEAD"));
 		return 0;
+	}
 
 	if (file_exists(rebase_path_amend())) {
 		struct strbuf rev = STRBUF_INIT;
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 15/38] sequencer (rebase -i): skip some revert/cherry-pick specific code path
From: Johannes Schindelin @ 2017-01-02 15:27 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

When a cherry-pick continues without a "todo script", the intention is
simply to pick a single commit.

However, when an interactive rebase is continued without a "todo
script", it means that the last command has been completed and that we
now need to clean up.

This commit guards the revert/cherry-pick specific steps so that they
are not executed in rebase -i mode.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/sequencer.c b/sequencer.c
index 52e17c8887..a7b9ee0d04 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -1878,26 +1878,28 @@ int sequencer_continue(struct replay_opts *opts)
 	if (is_rebase_i(opts)) {
 		if (commit_staged_changes(opts))
 			return -1;
-	}
-	if (!file_exists(get_todo_path(opts)))
+	} else if (!file_exists(get_todo_path(opts)))
 		return continue_single_pick();
 	if (read_populate_opts(opts))
 		return -1;
 	if ((res = read_populate_todo(&todo_list, opts)))
 		goto release_todo_list;
 
-	/* Verify that the conflict has been resolved */
-	if (file_exists(git_path_cherry_pick_head()) ||
-	    file_exists(git_path_revert_head())) {
-		res = continue_single_pick();
-		if (res)
+	if (!is_rebase_i(opts)) {
+		/* Verify that the conflict has been resolved */
+		if (file_exists(git_path_cherry_pick_head()) ||
+		    file_exists(git_path_revert_head())) {
+			res = continue_single_pick();
+			if (res)
+				goto release_todo_list;
+		}
+		if (index_differs_from("HEAD", 0, 0)) {
+			res = error_dirty_index(opts);
 			goto release_todo_list;
+		}
+		todo_list.current++;
 	}
-	if (index_differs_from("HEAD", 0, 0)) {
-		res = error_dirty_index(opts);
-		goto release_todo_list;
-	}
-	todo_list.current++;
+
 	res = pick_commits(&todo_list, opts);
 release_todo_list:
 	todo_list_release(&todo_list);
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 12/38] sequencer (rebase -i): write an author-script file
From: Johannes Schindelin @ 2017-01-02 15:27 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

When the interactive rebase aborts, it writes out an author-script file
to record the author information for the current commit. As we are about
to teach the sequencer how to perform the actions behind an interactive
rebase, it needs to write those author-script files, too.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 49 insertions(+), 1 deletion(-)

diff --git a/sequencer.c b/sequencer.c
index 29b944d724..9913882603 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -483,6 +483,52 @@ static int is_index_unchanged(void)
 	return !hashcmp(active_cache_tree->sha1, head_commit->tree->object.oid.hash);
 }
 
+static int write_author_script(const char *message)
+{
+	struct strbuf buf = STRBUF_INIT;
+	const char *eol;
+	int res;
+
+	for (;;)
+		if (!*message || starts_with(message, "\n")) {
+missing_author:
+			/* Missing 'author' line? */
+			unlink(rebase_path_author_script());
+			return 0;
+		} else if (skip_prefix(message, "author ", &message))
+			break;
+		else if ((eol = strchr(message, '\n')))
+			message = eol + 1;
+		else
+			goto missing_author;
+
+	strbuf_addstr(&buf, "GIT_AUTHOR_NAME='");
+	while (*message && *message != '\n' && *message != '\r')
+		if (skip_prefix(message, " <", &message))
+			break;
+		else if (*message != '\'')
+			strbuf_addch(&buf, *(message++));
+		else
+			strbuf_addf(&buf, "'\\\\%c'", *(message++));
+	strbuf_addstr(&buf, "'\nGIT_AUTHOR_EMAIL='");
+	while (*message && *message != '\n' && *message != '\r')
+		if (skip_prefix(message, "> ", &message))
+			break;
+		else if (*message != '\'')
+			strbuf_addch(&buf, *(message++));
+		else
+			strbuf_addf(&buf, "'\\\\%c'", *(message++));
+	strbuf_addstr(&buf, "'\nGIT_AUTHOR_DATE='@");
+	while (*message && *message != '\n' && *message != '\r')
+		if (*message != '\'')
+			strbuf_addch(&buf, *(message++));
+		else
+			strbuf_addf(&buf, "'\\\\%c'", *(message++));
+	res = write_message(buf.buf, buf.len, rebase_path_author_script(), 1);
+	strbuf_release(&buf);
+	return res;
+}
+
 /*
  * Read the author-script file into an environment block, ready for use in
  * run_command(), that can be free()d afterwards.
@@ -935,7 +981,9 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
 		}
 	}
 
-	if (!opts->strategy || !strcmp(opts->strategy, "recursive") || command == TODO_REVERT) {
+	if (is_rebase_i(opts) && write_author_script(msg.message) < 0)
+		res = -1;
+	else if (!opts->strategy || !strcmp(opts->strategy, "recursive") || command == TODO_REVERT) {
 		res = do_recursive_merge(base, next, base_label, next_label,
 					 head, &msgbuf, opts);
 		if (res < 0)
-- 
2.11.0.rc3.windows.1



^ permalink raw reply related

* [PATCH v3 10/38] sequencer (rebase -i): add support for the 'fixup' and 'squash' commands
From: Johannes Schindelin @ 2017-01-02 15:27 UTC (permalink / raw)
  To: git
  Cc: Junio C Hamano, Kevin Daudt, Dennis Kaarsemaker, Stephan Beyer,
	Jeff King
In-Reply-To: <cover.1483370556.git.johannes.schindelin@gmx.de>

This is a huge patch, and at the same time a huge step forward to
execute the performance-critical parts of the interactive rebase in a
builtin command.

Since 'fixup' and 'squash' are not only similar, but also need to know
about each other (we want to reduce a series of fixups/squashes into a
single, final commit message edit, from the user's point of view), we
really have to implement them both at the same time.

Most of the actual work is done by the existing code path that already
handles the "pick" and the "edit" commands; We added support for other
features (e.g. to amend the commit message) in the patches leading up to
this one, yet there are still quite a few bits in this patch that simply
would not make sense as individual patches (such as: determining whether
there was anything to "fix up" in the "todo" script, etc).

In theory, it would be possible to reuse the fast-forward code path also
for the fixup and the squash code paths, but in practice this would make
the code less readable. The end result cannot be fast-forwarded anyway,
therefore let's just extend the cherry-picking code path for now.

Since the sequencer parses the entire `git-rebase-todo` script in one go,
fixup or squash commands without a preceding pick can be reported early
(in git-rebase--interactive, we could only report such errors just before
executing the fixup/squash).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 227 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 217 insertions(+), 10 deletions(-)

diff --git a/sequencer.c b/sequencer.c
index 8ea3d6aa94..6a939a10bd 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -47,6 +47,35 @@ static GIT_PATH_FUNC(rebase_path_todo, "rebase-merge/git-rebase-todo")
  */
 static GIT_PATH_FUNC(rebase_path_done, "rebase-merge/done")
 /*
+ * The commit message that is planned to be used for any changes that
+ * need to be committed following a user interaction.
+ */
+static GIT_PATH_FUNC(rebase_path_message, "rebase-merge/message")
+/*
+ * The file into which is accumulated the suggested commit message for
+ * squash/fixup commands. When the first of a series of squash/fixups
+ * is seen, the file is created and the commit message from the
+ * previous commit and from the first squash/fixup commit are written
+ * to it. The commit message for each subsequent squash/fixup commit
+ * is appended to the file as it is processed.
+ *
+ * The first line of the file is of the form
+ *     # This is a combination of $count commits.
+ * where $count is the number of commits whose messages have been
+ * written to the file so far (including the initial "pick" commit).
+ * Each time that a commit message is processed, this line is read and
+ * updated. It is deleted just before the combined commit is made.
+ */
+static GIT_PATH_FUNC(rebase_path_squash_msg, "rebase-merge/message-squash")
+/*
+ * If the current series of squash/fixups has not yet included a squash
+ * command, then this file exists and holds the commit message of the
+ * original "pick" commit.  (If the series ends without a "squash"
+ * command, then this can be used as the commit message of the combined
+ * commit without opening the editor.)
+ */
+static GIT_PATH_FUNC(rebase_path_fixup_msg, "rebase-merge/message-fixup")
+/*
  * A script to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
  * GIT_AUTHOR_DATE that will be used for the commit that is currently
  * being rebased.
@@ -641,6 +670,8 @@ enum todo_command {
 	TODO_PICK = 0,
 	TODO_REVERT,
 	TODO_EDIT,
+	TODO_FIXUP,
+	TODO_SQUASH,
 	/* commands that do something else than handling a single commit */
 	TODO_EXEC,
 	/* commands that do nothing but are counted for reporting progress */
@@ -651,6 +682,8 @@ static const char *todo_command_strings[] = {
 	"pick",
 	"revert",
 	"edit",
+	"fixup",
+	"squash",
 	"exec",
 	"noop"
 };
@@ -667,15 +700,114 @@ static int is_noop(const enum todo_command command)
 	return TODO_NOOP <= (size_t)command;
 }
 
+static int is_fixup(enum todo_command command)
+{
+	return command == TODO_FIXUP || command == TODO_SQUASH;
+}
+
+static int update_squash_messages(enum todo_command command,
+		struct commit *commit, struct replay_opts *opts)
+{
+	struct strbuf buf = STRBUF_INIT;
+	int count, res;
+	const char *message, *body;
+
+	if (file_exists(rebase_path_squash_msg())) {
+		struct strbuf header = STRBUF_INIT;
+		char *eol, *p;
+
+		if (strbuf_read_file(&buf, rebase_path_squash_msg(), 2048) <= 0)
+			return error(_("could not read '%s'"),
+				rebase_path_squash_msg());
+
+		p = buf.buf + 1;
+		eol = strchrnul(buf.buf, '\n');
+		if (buf.buf[0] != comment_line_char ||
+		    (p += strcspn(p, "0123456789\n")) == eol)
+			return error(_("unexpected 1st line of squash message:"
+				       "\n\n\t%.*s"),
+				     (int)(eol - buf.buf), buf.buf);
+		count = strtol(p, NULL, 10);
+
+		if (count < 1)
+			return error(_("invalid 1st line of squash message:\n"
+				       "\n\t%.*s"),
+				     (int)(eol - buf.buf), buf.buf);
+
+		strbuf_addf(&header, "%c ", comment_line_char);
+		strbuf_addf(&header,
+			    _("This is a combination of %d commits."), ++count);
+		strbuf_splice(&buf, 0, eol - buf.buf, header.buf, header.len);
+		strbuf_release(&header);
+	} else {
+		unsigned char head[20];
+		struct commit *head_commit;
+		const char *head_message, *body;
+
+		if (get_sha1("HEAD", head))
+			return error(_("need a HEAD to fixup"));
+		if (!(head_commit = lookup_commit_reference(head)))
+			return error(_("could not read HEAD"));
+		if (!(head_message = get_commit_buffer(head_commit, NULL)))
+			return error(_("could not read HEAD's commit message"));
+
+		find_commit_subject(head_message, &body);
+		if (write_message(body, strlen(body),
+				  rebase_path_fixup_msg(), 0)) {
+			unuse_commit_buffer(head_commit, head_message);
+			return error(_("cannot write '%s'"),
+				     rebase_path_fixup_msg());
+		}
+
+		count = 2;
+		strbuf_addf(&buf, "%c ", comment_line_char);
+		strbuf_addf(&buf, _("This is a combination of %d commits."),
+			    count);
+		strbuf_addf(&buf, "\n%c ", comment_line_char);
+		strbuf_addstr(&buf, _("This is the 1st commit message:"));
+		strbuf_addstr(&buf, "\n\n");
+		strbuf_addstr(&buf, body);
+
+		unuse_commit_buffer(head_commit, head_message);
+	}
+
+	if (!(message = get_commit_buffer(commit, NULL)))
+		return error(_("could not read commit message of %s"),
+			     oid_to_hex(&commit->object.oid));
+	find_commit_subject(message, &body);
+
+	if (command == TODO_SQUASH) {
+		unlink(rebase_path_fixup_msg());
+		strbuf_addf(&buf, "\n%c ", comment_line_char);
+		strbuf_addf(&buf, _("This is the commit message #%d:"), count);
+		strbuf_addstr(&buf, "\n\n");
+		strbuf_addstr(&buf, body);
+	} else if (command == TODO_FIXUP) {
+		strbuf_addf(&buf, "\n%c ", comment_line_char);
+		strbuf_addf(&buf, _("The commit message #%d will be skipped:"),
+			    count);
+		strbuf_addstr(&buf, "\n\n");
+		strbuf_add_commented_lines(&buf, body, strlen(body));
+	} else
+		return error(_("unknown command: %d"), command);
+	unuse_commit_buffer(commit, message);
+
+	res = write_message(buf.buf, buf.len, rebase_path_squash_msg(), 0);
+	strbuf_release(&buf);
+	return res;
+}
+
 static int do_pick_commit(enum todo_command command, struct commit *commit,
-		struct replay_opts *opts)
+		struct replay_opts *opts, int final_fixup)
 {
+	int edit = opts->edit, cleanup_commit_message = 0;
+	const char *msg_file = edit ? NULL : git_path_merge_msg();
 	unsigned char head[20];
 	struct commit *base, *next, *parent;
 	const char *base_label, *next_label;
 	struct commit_message msg = { NULL, NULL, NULL, NULL };
 	struct strbuf msgbuf = STRBUF_INIT;
-	int res, unborn = 0, allow;
+	int res, unborn = 0, amend = 0, allow;
 
 	if (opts->no_commit) {
 		/*
@@ -720,7 +852,7 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
 	else
 		parent = commit->parents->item;
 
-	if (opts->allow_ff &&
+	if (opts->allow_ff && !is_fixup(command) &&
 	    ((parent && !hashcmp(parent->object.oid.hash, head)) ||
 	     (!parent && unborn)))
 		return fast_forward_to(commit->object.oid.hash, head, unborn, opts);
@@ -779,6 +911,27 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
 		}
 	}
 
+	if (is_fixup(command)) {
+		if (update_squash_messages(command, commit, opts))
+			return -1;
+		amend = 1;
+		if (!final_fixup)
+			msg_file = rebase_path_squash_msg();
+		else if (file_exists(rebase_path_fixup_msg())) {
+			cleanup_commit_message = 1;
+			msg_file = rebase_path_fixup_msg();
+		} else {
+			const char *dest = git_path("SQUASH_MSG");
+			unlink(dest);
+			if (copy_file(dest, rebase_path_squash_msg(), 0666))
+				return error(_("could not rename '%s' to '%s'"),
+					     rebase_path_squash_msg(), dest);
+			unlink(git_path("MERGE_MSG"));
+			msg_file = dest;
+			edit = 1;
+		}
+	}
+
 	if (!opts->strategy || !strcmp(opts->strategy, "recursive") || command == TODO_REVERT) {
 		res = do_recursive_merge(base, next, base_label, next_label,
 					 head, &msgbuf, opts);
@@ -834,8 +987,13 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
 		goto leave;
 	}
 	if (!opts->no_commit)
-		res = run_git_commit(opts->edit ? NULL : git_path_merge_msg(),
-				     opts, allow, opts->edit, 0, 0);
+		res = run_git_commit(msg_file, opts, allow, edit, amend,
+				     cleanup_commit_message);
+
+	if (!res && final_fixup) {
+		unlink(rebase_path_fixup_msg());
+		unlink(rebase_path_squash_msg());
+	}
 
 leave:
 	free_message(commit, &msg);
@@ -976,7 +1134,7 @@ static int parse_insn_buffer(char *buf, struct todo_list *todo_list)
 {
 	struct todo_item *item;
 	char *p = buf, *next_p;
-	int i, res = 0;
+	int i, res = 0, fixup_okay = file_exists(rebase_path_done());
 
 	for (i = 1; *p; i++, p = next_p) {
 		char *eol = strchrnul(p, '\n');
@@ -991,8 +1149,16 @@ static int parse_insn_buffer(char *buf, struct todo_list *todo_list)
 		if (parse_insn_line(item, p, eol)) {
 			res = error(_("invalid line %d: %.*s"),
 				i, (int)(eol - p), p);
-			item->command = -1;
+			item->command = TODO_NOOP;
 		}
+
+		if (fixup_okay)
+			; /* do nothing */
+		else if (is_fixup(item->command))
+			return error(_("cannot '%s' without a previous commit"),
+				command_to_string(item->command));
+		else if (!is_noop(item->command))
+			fixup_okay = 1;
 	}
 	if (!todo_list->nr)
 		return error(_("no commits parsed."));
@@ -1435,6 +1601,20 @@ static int error_with_patch(struct commit *commit,
 	return exit_code;
 }
 
+static int error_failed_squash(struct commit *commit,
+	struct replay_opts *opts, int subject_len, const char *subject)
+{
+	if (rename(rebase_path_squash_msg(), rebase_path_message()))
+		return error(_("could not rename '%s' to '%s'"),
+			rebase_path_squash_msg(), rebase_path_message());
+	unlink(rebase_path_fixup_msg());
+	unlink(git_path("MERGE_MSG"));
+	if (copy_file(git_path("MERGE_MSG"), rebase_path_message(), 0666))
+		return error(_("could not copy '%s' to '%s'"),
+			     rebase_path_message(), git_path("MERGE_MSG"));
+	return error_with_patch(commit, subject, subject_len, opts, 1, 0);
+}
+
 static int do_exec(const char *command_line)
 {
 	const char *child_argv[] = { NULL, NULL };
@@ -1475,6 +1655,21 @@ static int do_exec(const char *command_line)
 	return status;
 }
 
+static int is_final_fixup(struct todo_list *todo_list)
+{
+	int i = todo_list->current;
+
+	if (!is_fixup(todo_list->items[i].command))
+		return 0;
+
+	while (++i < todo_list->nr)
+		if (is_fixup(todo_list->items[i].command))
+			return 0;
+		else if (!is_noop(todo_list->items[i].command))
+			break;
+	return 1;
+}
+
 static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 {
 	int res = 0;
@@ -1490,9 +1685,15 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 		struct todo_item *item = todo_list->items + todo_list->current;
 		if (save_todo(todo_list, opts))
 			return -1;
-		if (item->command <= TODO_EDIT) {
+		if (is_rebase_i(opts)) {
+			unlink(rebase_path_message());
+			unlink(rebase_path_author_script());
+			unlink(rebase_path_stopped_sha());
+			unlink(rebase_path_amend());
+		}
+		if (item->command <= TODO_SQUASH) {
 			res = do_pick_commit(item->command, item->commit,
-					opts);
+					opts, is_final_fixup(todo_list));
 			if (item->command == TODO_EDIT) {
 				struct commit *commit = item->commit;
 				if (!res)
@@ -1503,6 +1704,12 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 					item->arg, item->arg_len, opts, res,
 					!res);
 			}
+			if (res && is_fixup(item->command)) {
+				if (res == 1)
+					intend_to_amend();
+				return error_failed_squash(item->commit, opts,
+					item->arg_len, item->arg);
+			}
 		} else if (item->command == TODO_EXEC) {
 			char *end_of_arg = (char *)(item->arg + item->arg_len);
 			int saved = *end_of_arg;
@@ -1601,7 +1808,7 @@ static int single_pick(struct commit *cmit, struct replay_opts *opts)
 {
 	setenv(GIT_REFLOG_ACTION, action_name(opts), 0);
 	return do_pick_commit(opts->action == REPLAY_PICK ?
-		TODO_PICK : TODO_REVERT, cmit, opts);
+		TODO_PICK : TODO_REVERT, cmit, opts, 0);
 }
 
 int sequencer_pick_revisions(struct replay_opts *opts)
-- 
2.11.0.rc3.windows.1



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