Merge branch 'ab/conditional-config-with-symlinks'

The recently introduced "[includeIf "gitdir:$dir"] path=..."
mechansim has further been taught to take symlinks into account.
The directory "$dir" specified in "gitdir:$dir" may be a symlink to
a real location, not something that $(getcwd) may return.  In such
a case, a realpath of "$dir" is compared with the real path of the
current repository to determine if the contents from the named path
should be included.

* ab/conditional-config-with-symlinks:
  config: match both symlink & realpath versions in IncludeIf.gitdir:*

config.c

@@ -214,6 +214,7 @@ static int include_by_gitdir(const struct config_options *opts,
 	struct strbuf pattern = STRBUF_INIT;
 	int ret = 0, prefix;
 	const char *git_dir;
+	int already_tried_absolute = 0;
 
 	if (opts->git_dir)
 		git_dir = opts->git_dir;
@@ -226,6 +227,7 @@ static int include_by_gitdir(const struct config_options *opts,
 	strbuf_add(&pattern, cond, cond_len);
 	prefix = prepare_include_condition_pattern(&pattern);
 
+again:
 	if (prefix < 0)
 		goto done;
 
@@ -245,6 +247,20 @@ static int include_by_gitdir(const struct config_options *opts,
 	ret = !wildmatch(pattern.buf + prefix, text.buf + prefix,
 			 icase ? WM_CASEFOLD : 0, NULL);
 
+	if (!ret && !already_tried_absolute) {
+		/*
+		 * We've tried e.g. matching gitdir:~/work, but if
+		 * ~/work is a symlink to /mnt/storage/work
+		 * strbuf_realpath() will expand it, so the rule won't
+		 * match. Let's match against a
+		 * strbuf_add_absolute_path() version of the path,
+		 * which'll do the right thing
+		 */
+		strbuf_reset(&text);
+		strbuf_add_absolute_path(&text, git_dir);
+		already_tried_absolute = 1;
+		goto again;
+	}
 done:
 	strbuf_release(&pattern);
 	strbuf_release(&text);