t1503 broken ?

t1503 broken ?

[Torsten Bögershausen]

./t1305-config-include.sh
seems to be broken:
not ok 19 - conditional include, $HOME expansion
not ok 21 - conditional include, relative path

Both Mac and Linux.

The problem seems to be the line

git config test.two >actual &&
and
git config test.four >actual &&

In both cases the config "test.two or test.four" is not found,
at least that is what my debugging shows.
After adding an
exit 0
before the test_done gives this:

 find trash\ directory.t1305-config-include/ -name "bar*"
trash directory.t1305-config-include/foo/.git/bar
trash directory.t1305-config-include/foo/.git/bar3
trash directory.t1305-config-include/foo/.git/bar5
trash directory.t1305-config-include/foo/.git/bar2
trash directory.t1305-config-include/bar4

Where should bar2 and bar4 be ?

Re: t1503 broken ?

[Duy Nguyen]

On Sat, Mar 25, 2017 at 5:46 PM, Torsten Bögershausen <tboegi@web.de> wrote:
> ./t1305-config-include.sh
> seems to be broken:
> not ok 19 - conditional include, $HOME expansion
> not ok 21 - conditional include, relative path

let me guess, your "git" directory is in a symlink path?
-- 
Duy

Re: t1503 broken ?

[Duy Nguyen]

On Sat, Mar 25, 2017 at 6:46 PM, Duy Nguyen <pclouds@gmail.com> wrote:
> On Sat, Mar 25, 2017 at 5:46 PM, Torsten Bögershausen <tboegi@web.de> wrote:
>> ./t1305-config-include.sh
>> seems to be broken:
>> not ok 19 - conditional include, $HOME expansion
>> not ok 21 - conditional include, relative path
>
> let me guess, your "git" directory is in a symlink path?

Yes I could reproduce it when I put my "git" in a symlink. There's a
note in document about "Symlinks in `$GIT_DIR` are not resolved before
matching" but failing tests is not acceptable. I'll fix it.
-- 
Duy

Re: t1503 broken ?

[Duy Nguyen]

On Sat, Mar 25, 2017 at 07:26:14PM +0700, Duy Nguyen wrote:
> On Sat, Mar 25, 2017 at 6:46 PM, Duy Nguyen <pclouds@gmail.com> wrote:
> > On Sat, Mar 25, 2017 at 5:46 PM, Torsten Bögershausen <tboegi@web.de> wrote:
> >> ./t1305-config-include.sh
> >> seems to be broken:
> >> not ok 19 - conditional include, $HOME expansion
> >> not ok 21 - conditional include, relative path
> >
> > let me guess, your "git" directory is in a symlink path?
> 
> Yes I could reproduce it when I put my "git" in a symlink. There's a
> note in document about "Symlinks in `$GIT_DIR` are not resolved before
> matching" but failing tests is not acceptable. I'll fix it.

The fix may be something like this. The problem is $GIT_DIR has symlinks
resolved, but we don't do the same for other paths in this code. As a
result, matching paths fails.

I'm a bit concerned about the change in expand_user_path() because I'm
not quite sure if it's a completely safe change. But at least could
you try the patch and see if it passe the tests on your machine too?

-- 8< --
diff --git a/config.c b/config.c
index 1a4d855..fc4eae9 100644
--- a/config.c
+++ b/config.c
@@ -191,7 +191,7 @@ static int prepare_include_condition_pattern(struct strbuf *pat)
 			return error(_("relative config include "
 				       "conditionals must come from files"));
 
-		strbuf_add_absolute_path(&path, cf->path);
+		strbuf_realpath(&path, cf->path, 1);
 		slash = find_last_dir_sep(path.buf);
 		if (!slash)
 			die("BUG: how is this possible?");
@@ -213,7 +213,7 @@ static int include_by_gitdir(const char *cond, size_t cond_len, int icase)
 	struct strbuf pattern = STRBUF_INIT;
 	int ret = 0, prefix;
 
-	strbuf_add_absolute_path(&text, get_git_dir());
+	strbuf_realpath(&text, get_git_dir(), 1);
 	strbuf_add(&pattern, cond, cond_len);
 	prefix = prepare_include_condition_pattern(&pattern);
 
diff --git a/path.c b/path.c
index 2224843..18eaac3 100644
--- a/path.c
+++ b/path.c
@@ -654,7 +654,7 @@ char *expand_user_path(const char *path)
 			const char *home = getenv("HOME");
 			if (!home)
 				goto return_null;
-			strbuf_addstr(&user_path, home);
+			strbuf_addstr(&user_path, real_path(home));
 #ifdef GIT_WINDOWS_NATIVE
 			convert_slashes(user_path.buf);
 #endif
-- 8< --
-- 
Duy

Re: t1503 broken ?

[Torsten Bögershausen]

On 03/25/2017 02:05 PM, Duy Nguyen wrote:
> On Sat, Mar 25, 2017 at 07:26:14PM +0700, Duy Nguyen wrote:
>> On Sat, Mar 25, 2017 at 6:46 PM, Duy Nguyen <pclouds@gmail.com> wrote:
>>> On Sat, Mar 25, 2017 at 5:46 PM, Torsten Bögershausen <tboegi@web.de> wrote:
>>>> ./t1305-config-include.sh
>>>> seems to be broken:
>>>> not ok 19 - conditional include, $HOME expansion
>>>> not ok 21 - conditional include, relative path
>>> let me guess, your "git" directory is in a symlink path?
>> Yes I could reproduce it when I put my "git" in a symlink. There's a
>> note in document about "Symlinks in `$GIT_DIR` are not resolved before
>> matching" but failing tests is not acceptable. I'll fix it.
> The fix may be something like this. The problem is $GIT_DIR has symlinks
> resolved, but we don't do the same for other paths in this code. As a
> result, matching paths fails.
>
> I'm a bit concerned about the change in expand_user_path() because I'm
> not quite sure if it's a completely safe change. But at least could
> you try the patch and see if it passe the tests on your machine too?
>
> -- 8< --
> diff --git a/config.c b/config.c
> index 1a4d855..fc4eae9 100644
> --- a/config.c
> +++ b/config.c
> @@ -191,7 +191,7 @@ static int prepare_include_condition_pattern(struct strbuf *pat)
>   			return error(_("relative config include "
>   				       "conditionals must come from files"));
>   
> -		strbuf_add_absolute_path(&path, cf->path);
> +		strbuf_realpath(&path, cf->path, 1);
>   		slash = find_last_dir_sep(path.buf);
>   		if (!slash)
>   			die("BUG: how is this possible?");
> @@ -213,7 +213,7 @@ static int include_by_gitdir(const char *cond, size_t cond_len, int icase)
>   	struct strbuf pattern = STRBUF_INIT;
>   	int ret = 0, prefix;
>   
> -	strbuf_add_absolute_path(&text, get_git_dir());
> +	strbuf_realpath(&text, get_git_dir(), 1);
>   	strbuf_add(&pattern, cond, cond_len);
>   	prefix = prepare_include_condition_pattern(&pattern);
>   
> diff --git a/path.c b/path.c
> index 2224843..18eaac3 100644
> --- a/path.c
> +++ b/path.c
> @@ -654,7 +654,7 @@ char *expand_user_path(const char *path)
>   			const char *home = getenv("HOME");
>   			if (!home)
>   				goto return_null;
> -			strbuf_addstr(&user_path, home);
> +			strbuf_addstr(&user_path, real_path(home));
>   #ifdef GIT_WINDOWS_NATIVE
>   			convert_slashes(user_path.buf);
>   #endif
> -- 8< --

Thanks for the fast reply.
Yes, my path is a softlink - into a directory under NoBackup/ - to make 
the backup shorter.
And I had forgotten about this :-(
And yes, your patch fixes it- tested under Linux.

[PATCH 1/2] path.c: and an option to call real_path() in expand_user_path()

[Nguyễn Thái Ngọc Duy]

In the next patch we need the ability to expand '~' to
real_path($HOME). But we can't do that from outside because '~' is part
of a pattern, not a true path. Add an option to expand_user_path() to do
so.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 builtin/commit.c   |  2 +-
 builtin/config.c   |  2 +-
 cache.h            |  2 +-
 config.c           |  8 ++++----
 credential-cache.c |  2 +-
 credential-store.c |  2 +-
 path.c             | 11 ++++++++---
 7 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/builtin/commit.c b/builtin/commit.c
index 4e288bc513..ad188fea9e 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -1404,7 +1404,7 @@ int cmd_status(int argc, const char **argv, const char *prefix)
 
 static const char *implicit_ident_advice(void)
 {
-	char *user_config = expand_user_path("~/.gitconfig");
+	char *user_config = expand_user_path("~/.gitconfig", 0);
 	char *xdg_config = xdg_config_home("config");
 	int config_exists = file_exists(user_config) || file_exists(xdg_config);
 
diff --git a/builtin/config.c b/builtin/config.c
index 05843a0f96..70bfaaaa1d 100644
--- a/builtin/config.c
+++ b/builtin/config.c
@@ -502,7 +502,7 @@ int cmd_config(int argc, const char **argv, const char *prefix)
 	}
 
 	if (use_global_config) {
-		char *user_config = expand_user_path("~/.gitconfig");
+		char *user_config = expand_user_path("~/.gitconfig", 0);
 		char *xdg_config = xdg_config_home("config");
 
 		if (!user_config)
diff --git a/cache.h b/cache.h
index 2214d52f61..62e44bfa2f 100644
--- a/cache.h
+++ b/cache.h
@@ -1146,7 +1146,7 @@ typedef int create_file_fn(const char *path, void *cb);
 int raceproof_create_file(const char *path, create_file_fn fn, void *cb);
 
 int mkdir_in_gitdir(const char *path);
-extern char *expand_user_path(const char *path);
+extern char *expand_user_path(const char *path, int real_home);
 const char *enter_repo(const char *path, int strict);
 static inline int is_absolute_path(const char *path)
 {
diff --git a/config.c b/config.c
index 1a4d85537b..f036c721e6 100644
--- a/config.c
+++ b/config.c
@@ -135,7 +135,7 @@ static int handle_path_include(const char *path, struct config_include_data *inc
 	if (!path)
 		return config_error_nonbool("include.path");
 
-	expanded = expand_user_path(path);
+	expanded = expand_user_path(path, 0);
 	if (!expanded)
 		return error("could not expand include path '%s'", path);
 	path = expanded;
@@ -177,7 +177,7 @@ static int prepare_include_condition_pattern(struct strbuf *pat)
 	char *expanded;
 	int prefix = 0;
 
-	expanded = expand_user_path(pat->buf);
+	expanded = expand_user_path(pat->buf, 0);
 	if (expanded) {
 		strbuf_reset(pat);
 		strbuf_addstr(pat, expanded);
@@ -948,7 +948,7 @@ int git_config_pathname(const char **dest, const char *var, const char *value)
 {
 	if (!value)
 		return config_error_nonbool(var);
-	*dest = expand_user_path(value);
+	*dest = expand_user_path(value, 0);
 	if (!*dest)
 		die(_("failed to expand user dir in: '%s'"), value);
 	return 0;
@@ -1498,7 +1498,7 @@ static int do_git_config_sequence(config_fn_t fn, void *data)
 {
 	int ret = 0;
 	char *xdg_config = xdg_config_home("config");
-	char *user_config = expand_user_path("~/.gitconfig");
+	char *user_config = expand_user_path("~/.gitconfig", 0);
 	char *repo_config = have_git_dir() ? git_pathdup("config") : NULL;
 
 	current_parsing_scope = CONFIG_SCOPE_SYSTEM;
diff --git a/credential-cache.c b/credential-cache.c
index 3cbd420019..91550bfb0b 100644
--- a/credential-cache.c
+++ b/credential-cache.c
@@ -87,7 +87,7 @@ static char *get_socket_path(void)
 {
 	struct stat sb;
 	char *old_dir, *socket;
-	old_dir = expand_user_path("~/.git-credential-cache");
+	old_dir = expand_user_path("~/.git-credential-cache", 0);
 	if (old_dir && !stat(old_dir, &sb) && S_ISDIR(sb.st_mode))
 		socket = xstrfmt("%s/socket", old_dir);
 	else
diff --git a/credential-store.c b/credential-store.c
index 55ca1b1334..ac295420dd 100644
--- a/credential-store.c
+++ b/credential-store.c
@@ -168,7 +168,7 @@ int cmd_main(int argc, const char **argv)
 	if (file) {
 		string_list_append(&fns, file);
 	} else {
-		if ((file = expand_user_path("~/.git-credentials")))
+		if ((file = expand_user_path("~/.git-credentials", 0)))
 			string_list_append_nodup(&fns, file);
 		file = xdg_config_home("credentials");
 		if (file)
diff --git a/path.c b/path.c
index 22248436bf..010c565512 100644
--- a/path.c
+++ b/path.c
@@ -638,8 +638,10 @@ static struct passwd *getpw_str(const char *username, size_t len)
  * Return a string with ~ and ~user expanded via getpw*.  If buf != NULL,
  * then it is a newly allocated string. Returns NULL on getpw failure or
  * if path is NULL.
+ *
+ * If real_home is true, real_path($HOME) is used in the expansion.
  */
-char *expand_user_path(const char *path)
+char *expand_user_path(const char *path, int real_home)
 {
 	struct strbuf user_path = STRBUF_INIT;
 	const char *to_copy = path;
@@ -654,7 +656,10 @@ char *expand_user_path(const char *path)
 			const char *home = getenv("HOME");
 			if (!home)
 				goto return_null;
-			strbuf_addstr(&user_path, home);
+			if (real_home)
+				strbuf_addstr(&user_path, real_path(home));
+			else
+				strbuf_addstr(&user_path, home);
 #ifdef GIT_WINDOWS_NATIVE
 			convert_slashes(user_path.buf);
 #endif
@@ -723,7 +728,7 @@ const char *enter_repo(const char *path, int strict)
 		strbuf_add(&validated_path, path, len);
 
 		if (used_path.buf[0] == '~') {
-			char *newpath = expand_user_path(used_path.buf);
+			char *newpath = expand_user_path(used_path.buf, 0);
 			if (!newpath)
 				return NULL;
 			strbuf_attach(&used_path, newpath, strlen(newpath),
-- 
2.11.0.157.gd943d85

[PATCH 2/2] config: resolve symlinks in conditional include's patterns

[Nguyễn Thái Ngọc Duy]

$GIT_DIR returned by get_git_dir() is normalized, with all symlinks
resolved (see setup_work_tree function). In order to match paths (or
patterns) against $GIT_DIR char-by-char, they have to be normalized
too. There is a note in config.txt about this, that the user need to
resolve symlinks by themselves if needed.

The problem is, we allow certain path expansion, '~/' and './', for
convenience and can't ask the user to resolve symlinks in these
expansions. Make sure the expanded paths have all symlinks resolved.

PS. The strbuf_realpath(&text, get_git_dir(), 1) is still needed because
get_git_dir() may return relative path.

Noticed-by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 config.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/config.c b/config.c
index f036c721e6..d5ba848b65 100644
--- a/config.c
+++ b/config.c
@@ -177,7 +177,7 @@ static int prepare_include_condition_pattern(struct strbuf *pat)
 	char *expanded;
 	int prefix = 0;
 
-	expanded = expand_user_path(pat->buf, 0);
+	expanded = expand_user_path(pat->buf, 1);
 	if (expanded) {
 		strbuf_reset(pat);
 		strbuf_addstr(pat, expanded);
@@ -191,7 +191,7 @@ static int prepare_include_condition_pattern(struct strbuf *pat)
 			return error(_("relative config include "
 				       "conditionals must come from files"));
 
-		strbuf_add_absolute_path(&path, cf->path);
+		strbuf_realpath(&path, cf->path, 1);
 		slash = find_last_dir_sep(path.buf);
 		if (!slash)
 			die("BUG: how is this possible?");
@@ -213,7 +213,7 @@ static int include_by_gitdir(const char *cond, size_t cond_len, int icase)
 	struct strbuf pattern = STRBUF_INIT;
 	int ret = 0, prefix;
 
-	strbuf_add_absolute_path(&text, get_git_dir());
+	strbuf_realpath(&text, get_git_dir(), 1);
 	strbuf_add(&pattern, cond, cond_len);
 	prefix = prepare_include_condition_pattern(&pattern);
 
-- 
2.11.0.157.gd943d85

Re: [PATCH 2/2] config: resolve symlinks in conditional include's patterns

[Junio C Hamano]

Nguyễn Thái Ngọc Duy  <pclouds@gmail.com> writes:

> $GIT_DIR returned by get_git_dir() is normalized, with all symlinks
> resolved (see setup_work_tree function). In order to match paths (or
> patterns) against $GIT_DIR char-by-char, they have to be normalized
> too. There is a note in config.txt about this, that the user need to
> resolve symlinks by themselves if needed.
>
> The problem is, we allow certain path expansion, '~/' and './', for
> convenience and can't ask the user to resolve symlinks in these
> expansions. Make sure the expanded paths have all symlinks resolved.

That sounds sensible but I fail to see why 1/2 is the right approach
to do this, and I must be missing something.  Wouldn't you get the
same result if you run realpath() yourself on expanded, after
receiving the return value of expand_user_path() in it?

Can you add a test to demonstrate the issue (which would need to be
protected with SYMLINKS prereq)?

Thanks.

> PS. The strbuf_realpath(&text, get_git_dir(), 1) is still needed because
> get_git_dir() may return relative path.
>
> Noticed-by: Torsten Bögershausen <tboegi@web.de>
> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
> ---
>  config.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/config.c b/config.c
> index f036c721e6..d5ba848b65 100644
> --- a/config.c
> +++ b/config.c
> @@ -177,7 +177,7 @@ static int prepare_include_condition_pattern(struct strbuf *pat)
>  	char *expanded;
>  	int prefix = 0;
>  
> -	expanded = expand_user_path(pat->buf, 0);
> +	expanded = expand_user_path(pat->buf, 1);
>  	if (expanded) {
>  		strbuf_reset(pat);
>  		strbuf_addstr(pat, expanded);
> @@ -191,7 +191,7 @@ static int prepare_include_condition_pattern(struct strbuf *pat)
>  			return error(_("relative config include "
>  				       "conditionals must come from files"));
>  
> -		strbuf_add_absolute_path(&path, cf->path);
> +		strbuf_realpath(&path, cf->path, 1);
>  		slash = find_last_dir_sep(path.buf);
>  		if (!slash)
>  			die("BUG: how is this possible?");
> @@ -213,7 +213,7 @@ static int include_by_gitdir(const char *cond, size_t cond_len, int icase)
>  	struct strbuf pattern = STRBUF_INIT;
>  	int ret = 0, prefix;
>  
> -	strbuf_add_absolute_path(&text, get_git_dir());
> +	strbuf_realpath(&text, get_git_dir(), 1);
>  	strbuf_add(&pattern, cond, cond_len);
>  	prefix = prepare_include_condition_pattern(&pattern);

Re: [PATCH 2/2] config: resolve symlinks in conditional include's patterns

[Duy Nguyen]

On Fri, Mar 31, 2017 at 1:38 AM, Junio C Hamano <gitster@pobox.com> wrote:
> Nguyễn Thái Ngọc Duy  <pclouds@gmail.com> writes:
>
>> $GIT_DIR returned by get_git_dir() is normalized, with all symlinks
>> resolved (see setup_work_tree function). In order to match paths (or
>> patterns) against $GIT_DIR char-by-char, they have to be normalized
>> too. There is a note in config.txt about this, that the user need to
>> resolve symlinks by themselves if needed.
>>
>> The problem is, we allow certain path expansion, '~/' and './', for
>> convenience and can't ask the user to resolve symlinks in these
>> expansions. Make sure the expanded paths have all symlinks resolved.
>
> That sounds sensible but I fail to see why 1/2 is the right approach
> to do this, and I must be missing something.  Wouldn't you get the
> same result if you run realpath() yourself on expanded, after
> receiving the return value of expand_user_path() in it?

Because at that point I don't know what part is $HOME (i.e. valid path
that real_path can walk through), what part is random wildcards from
the pattern. Note that in this case we pass a wildmatch pattern to
expand_user_path(), like ~/[ab]foo/*bar*/**. After expansion it
becomes /home/pclouds/[ab]foo/*bar*/**. It does not feel right to let
real_path() walk the "[ab]foo..." part. In the tests, I hit
die("Invalid path") in strbuf_realpath(). Even if I set die_on_error()
to avoid that, strbuf_realpath() will not return the resolved path

> Can you add a test to demonstrate the issue (which would need to be
> protected with SYMLINKS prereq)?

Will do. It may look a bit ugly though because I have to force
setup_git_directory() to call real_path() because it doesn't always do
that.
-- 
Duy

[PATCH v2 1/2] path.c: and an option to call real_path() in expand_user_path()

[Nguyễn Thái Ngọc Duy]

In the next patch we need the ability to expand '~' to
real_path($HOME). But we can't do that from outside because '~' is part
of a pattern, not a true path. Add an option to expand_user_path() to do
so.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 No changes in v2.

 builtin/commit.c   |  2 +-
 builtin/config.c   |  2 +-
 cache.h            |  2 +-
 config.c           |  8 ++++----
 credential-cache.c |  2 +-
 credential-store.c |  2 +-
 path.c             | 11 ++++++++---
 7 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/builtin/commit.c b/builtin/commit.c
index 4e288bc513..ad188fea9e 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -1404,7 +1404,7 @@ int cmd_status(int argc, const char **argv, const char *prefix)
 
 static const char *implicit_ident_advice(void)
 {
-	char *user_config = expand_user_path("~/.gitconfig");
+	char *user_config = expand_user_path("~/.gitconfig", 0);
 	char *xdg_config = xdg_config_home("config");
 	int config_exists = file_exists(user_config) || file_exists(xdg_config);
 
diff --git a/builtin/config.c b/builtin/config.c
index 05843a0f96..70bfaaaa1d 100644
--- a/builtin/config.c
+++ b/builtin/config.c
@@ -502,7 +502,7 @@ int cmd_config(int argc, const char **argv, const char *prefix)
 	}
 
 	if (use_global_config) {
-		char *user_config = expand_user_path("~/.gitconfig");
+		char *user_config = expand_user_path("~/.gitconfig", 0);
 		char *xdg_config = xdg_config_home("config");
 
 		if (!user_config)
diff --git a/cache.h b/cache.h
index 2214d52f61..62e44bfa2f 100644
--- a/cache.h
+++ b/cache.h
@@ -1146,7 +1146,7 @@ typedef int create_file_fn(const char *path, void *cb);
 int raceproof_create_file(const char *path, create_file_fn fn, void *cb);
 
 int mkdir_in_gitdir(const char *path);
-extern char *expand_user_path(const char *path);
+extern char *expand_user_path(const char *path, int real_home);
 const char *enter_repo(const char *path, int strict);
 static inline int is_absolute_path(const char *path)
 {
diff --git a/config.c b/config.c
index 1a4d85537b..f036c721e6 100644
--- a/config.c
+++ b/config.c
@@ -135,7 +135,7 @@ static int handle_path_include(const char *path, struct config_include_data *inc
 	if (!path)
 		return config_error_nonbool("include.path");
 
-	expanded = expand_user_path(path);
+	expanded = expand_user_path(path, 0);
 	if (!expanded)
 		return error("could not expand include path '%s'", path);
 	path = expanded;
@@ -177,7 +177,7 @@ static int prepare_include_condition_pattern(struct strbuf *pat)
 	char *expanded;
 	int prefix = 0;
 
-	expanded = expand_user_path(pat->buf);
+	expanded = expand_user_path(pat->buf, 0);
 	if (expanded) {
 		strbuf_reset(pat);
 		strbuf_addstr(pat, expanded);
@@ -948,7 +948,7 @@ int git_config_pathname(const char **dest, const char *var, const char *value)
 {
 	if (!value)
 		return config_error_nonbool(var);
-	*dest = expand_user_path(value);
+	*dest = expand_user_path(value, 0);
 	if (!*dest)
 		die(_("failed to expand user dir in: '%s'"), value);
 	return 0;
@@ -1498,7 +1498,7 @@ static int do_git_config_sequence(config_fn_t fn, void *data)
 {
 	int ret = 0;
 	char *xdg_config = xdg_config_home("config");
-	char *user_config = expand_user_path("~/.gitconfig");
+	char *user_config = expand_user_path("~/.gitconfig", 0);
 	char *repo_config = have_git_dir() ? git_pathdup("config") : NULL;
 
 	current_parsing_scope = CONFIG_SCOPE_SYSTEM;
diff --git a/credential-cache.c b/credential-cache.c
index 3cbd420019..91550bfb0b 100644
--- a/credential-cache.c
+++ b/credential-cache.c
@@ -87,7 +87,7 @@ static char *get_socket_path(void)
 {
 	struct stat sb;
 	char *old_dir, *socket;
-	old_dir = expand_user_path("~/.git-credential-cache");
+	old_dir = expand_user_path("~/.git-credential-cache", 0);
 	if (old_dir && !stat(old_dir, &sb) && S_ISDIR(sb.st_mode))
 		socket = xstrfmt("%s/socket", old_dir);
 	else
diff --git a/credential-store.c b/credential-store.c
index 55ca1b1334..ac295420dd 100644
--- a/credential-store.c
+++ b/credential-store.c
@@ -168,7 +168,7 @@ int cmd_main(int argc, const char **argv)
 	if (file) {
 		string_list_append(&fns, file);
 	} else {
-		if ((file = expand_user_path("~/.git-credentials")))
+		if ((file = expand_user_path("~/.git-credentials", 0)))
 			string_list_append_nodup(&fns, file);
 		file = xdg_config_home("credentials");
 		if (file)
diff --git a/path.c b/path.c
index 22248436bf..010c565512 100644
--- a/path.c
+++ b/path.c
@@ -638,8 +638,10 @@ static struct passwd *getpw_str(const char *username, size_t len)
  * Return a string with ~ and ~user expanded via getpw*.  If buf != NULL,
  * then it is a newly allocated string. Returns NULL on getpw failure or
  * if path is NULL.
+ *
+ * If real_home is true, real_path($HOME) is used in the expansion.
  */
-char *expand_user_path(const char *path)
+char *expand_user_path(const char *path, int real_home)
 {
 	struct strbuf user_path = STRBUF_INIT;
 	const char *to_copy = path;
@@ -654,7 +656,10 @@ char *expand_user_path(const char *path)
 			const char *home = getenv("HOME");
 			if (!home)
 				goto return_null;
-			strbuf_addstr(&user_path, home);
+			if (real_home)
+				strbuf_addstr(&user_path, real_path(home));
+			else
+				strbuf_addstr(&user_path, home);
 #ifdef GIT_WINDOWS_NATIVE
 			convert_slashes(user_path.buf);
 #endif
@@ -723,7 +728,7 @@ const char *enter_repo(const char *path, int strict)
 		strbuf_add(&validated_path, path, len);
 
 		if (used_path.buf[0] == '~') {
-			char *newpath = expand_user_path(used_path.buf);
+			char *newpath = expand_user_path(used_path.buf, 0);
 			if (!newpath)
 				return NULL;
 			strbuf_attach(&used_path, newpath, strlen(newpath),
-- 
2.11.0.157.gd943d85

[PATCH v2 2/2] config: resolve symlinks in conditional include's patterns

[Nguyễn Thái Ngọc Duy]

$GIT_DIR returned by get_git_dir() is normalized, with all symlinks
resolved (see setup_work_tree function). In order to match paths (or
patterns) against $GIT_DIR char-by-char, they have to be normalized
too. There is a note in config.txt about this, that the user need to
resolve symlinks by themselves if needed.

The problem is, we allow certain path expansion, '~/' and './', for
convenience and can't ask the user to resolve symlinks in these
expansions. Make sure the expanded paths have all symlinks resolved.

PS. The strbuf_realpath(&text, get_git_dir(), 1) is still needed because
get_git_dir() may return relative path.

Noticed-by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 Tests are added in v2.

 config.c                  |  6 +++---
 t/t1305-config-include.sh | 54 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+), 3 deletions(-)

diff --git a/config.c b/config.c
index f036c721e6..d5ba848b65 100644
--- a/config.c
+++ b/config.c
@@ -177,7 +177,7 @@ static int prepare_include_condition_pattern(struct strbuf *pat)
 	char *expanded;
 	int prefix = 0;
 
-	expanded = expand_user_path(pat->buf, 0);
+	expanded = expand_user_path(pat->buf, 1);
 	if (expanded) {
 		strbuf_reset(pat);
 		strbuf_addstr(pat, expanded);
@@ -191,7 +191,7 @@ static int prepare_include_condition_pattern(struct strbuf *pat)
 			return error(_("relative config include "
 				       "conditionals must come from files"));
 
-		strbuf_add_absolute_path(&path, cf->path);
+		strbuf_realpath(&path, cf->path, 1);
 		slash = find_last_dir_sep(path.buf);
 		if (!slash)
 			die("BUG: how is this possible?");
@@ -213,7 +213,7 @@ static int include_by_gitdir(const char *cond, size_t cond_len, int icase)
 	struct strbuf pattern = STRBUF_INIT;
 	int ret = 0, prefix;
 
-	strbuf_add_absolute_path(&text, get_git_dir());
+	strbuf_realpath(&text, get_git_dir(), 1);
 	strbuf_add(&pattern, cond, cond_len);
 	prefix = prepare_include_condition_pattern(&pattern);
 
diff --git a/t/t1305-config-include.sh b/t/t1305-config-include.sh
index e833939320..8fbc7a029f 100755
--- a/t/t1305-config-include.sh
+++ b/t/t1305-config-include.sh
@@ -3,6 +3,16 @@
 test_description='test config file include directives'
 . ./test-lib.sh
 
+# Force setup_explicit_git_dir() to run until the end. This is needed
+# by some tests to make sure real_path() is called on $GIT_DIR. The
+# caller needs to make sure git commands are run from a subdirectory
+# though or real_path() will not be called.
+force_setup_explicit_git_dir() {
+    GIT_DIR="$(pwd)/.git"
+    GIT_WORK_TREE="$(pwd)"
+    export GIT_DIR GIT_WORK_TREE
+}
+
 test_expect_success 'include file by absolute path' '
 	echo "[test]one = 1" >one &&
 	echo "[include]path = \"$(pwd)/one\"" >.gitconfig &&
@@ -208,6 +218,50 @@ test_expect_success 'conditional include, both unanchored, icase' '
 	)
 '
 
+test_expect_success SYMLINKS 'conditional include, set up symlinked $HOME' '
+	mkdir real-home &&
+	ln -s real-home home &&
+	(
+		HOME="$TRASH_DIRECTORY/home" &&
+		export HOME &&
+		cd "$HOME" &&
+
+		git init foo &&
+		cd foo &&
+		mkdir sub
+	)
+'
+
+test_expect_success SYMLINKS 'conditional include, $HOME expansion with symlinks' '
+	(
+		HOME="$TRASH_DIRECTORY/home" &&
+		export HOME &&
+		cd "$HOME"/foo &&
+
+		echo "[includeIf \"gitdir:~/foo/\"]path=bar2" >>.git/config &&
+		echo "[test]two=2" >.git/bar2 &&
+		echo 2 >expect &&
+		force_setup_explicit_git_dir &&
+		git -C sub config test.two >actual &&
+		test_cmp expect actual
+	)
+'
+
+test_expect_success SYMLINKS 'conditional include, relative path with symlinks' '
+	echo "[includeIf \"gitdir:./foo/.git\"]path=bar4" >home/.gitconfig &&
+	echo "[test]four=4" >home/bar4 &&
+	(
+		HOME="$TRASH_DIRECTORY/home" &&
+		export HOME &&
+		cd "$HOME"/foo &&
+
+		echo 4 >expect &&
+		force_setup_explicit_git_dir &&
+		git -C sub config test.four >actual &&
+		test_cmp expect actual
+	)
+'
+
 test_expect_success 'include cycles are detected' '
 	cat >.gitconfig <<-\EOF &&
 	[test]value = gitconfig
-- 
2.11.0.157.gd943d85