$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 <tbo...@web.de>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@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

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