Re: Bug? ran into a "fatal" using interactive rebase

[Johannes Schindelin <Johannes.Schindelin@gmx.de>]

Hi Ralf,

On Tue, 6 Sep 2016, Ralf Thielow wrote:

> today I accidentally triggered a "fatal" using interactive rebase.
> 
> If you edit the instruction sheet after 'rebase -i' and add an unknown
> command, Git stops because it doesn't know the command.
> That's fine, however, now we are in a state where 'git status' fails with
> 
> interactive rebase in progress; onto 311f279
> fatal: Could not open file .git/rebase-merge/done for reading: No such
> file or directory

There was some discussion revolving around this (IIRC Matthieu was
involved, hence I Cc:ed him) and I was under the impression that we fixed
the status code not to assume the presence of the "done" file.

Apparently I was wrong...

So, something like this should help (if you are interested in seeing this
patch included, please run with it, as I am running short on time):

-- snipsnap --
diff --git a/wt-status.c b/wt-status.c
index 6225a2d..8e4d999 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -1072,14 +1072,17 @@ static void abbrev_sha1_in_line(struct strbuf *line)
 	strbuf_list_free(split);
 }
 
-static void read_rebase_todolist(const char *fname, struct string_list *lines)
+static void read_rebase_todolist(const char *fname, struct string_list *lines, int gently)
 {
 	struct strbuf line = STRBUF_INIT;
 	FILE *f = fopen(git_path("%s", fname), "r");
 
-	if (!f)
+	if (!f) {
+		if (gently)
+			return;
 		die_errno("Could not open file %s for reading",
 			  git_path("%s", fname));
+	}
 	while (!strbuf_getline_lf(&line, f)) {
 		if (line.len && line.buf[0] == comment_line_char)
 			continue;
@@ -1102,8 +1105,8 @@ static void show_rebase_information(struct wt_status *s,
 		struct string_list have_done = STRING_LIST_INIT_DUP;
 		struct string_list yet_to_do = STRING_LIST_INIT_DUP;
 
-		read_rebase_todolist("rebase-merge/done", &have_done);
-		read_rebase_todolist("rebase-merge/git-rebase-todo",
		&yet_to_do);
+		read_rebase_todolist("rebase-merge/done", &have_done, 1);
+		read_rebase_todolist("rebase-merge/git-rebase-todo", &yet_to_do, 0);
 
 		if (have_done.nr == 0)
 			status_printf_ln(s, color, _("No commands done."));