[PATCH v3 2/2] MacOs: Precompose startup_info->prefix

[tboegi@web.de]

From: Torsten Bögershausen <tboegi@web.de>

The "prefix" was precomposed for MacOs in commit 5c327502db,
MacOS: precompose_argv_prefix()

However, this commit forgot to update "startup_info->prefix" after
precomposing.

Move the (possible) precomposition towards the end of
setup_git_directory_gently(), so that precompose_string_if_needed()
can use git_config_get_bool("core.precomposeunicode") correctly.

Keep prefix, startup_info->prefix and GIT_PREFIX_ENVIRONMENT all in sync.

And as a result, the prefix no longer needs to be precomposed in git.c

Reported-by: Dmitry Torilov <d.torilov@gmail.com>
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Torsten Bögershausen <tboegi@web.de>
---

 Changes since V2:
 - Re-arranged code in setup.c to be more consistent
 - Added the longer comment block, as suggested by Junio, thanks for that.

 git.c   |  2 +-
 setup.c | 28 ++++++++++++++++++----------
 2 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/git.c b/git.c
index 9bc077a025..b53e665671 100644
--- a/git.c
+++ b/git.c
@@ -423,7 +423,7 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 			int nongit_ok;
 			prefix = setup_git_directory_gently(&nongit_ok);
 		}
-		prefix = precompose_argv_prefix(argc, argv, prefix);
+		precompose_argv_prefix(argc, argv, NULL);
 		if (use_pager == -1 && p->option & (RUN_SETUP | RUN_SETUP_GENTLY) &&
 		    !(p->option & DELAY_PAGER_CONFIG))
 			use_pager = check_pager_config(p->cmd);
diff --git a/setup.c b/setup.c
index c04cd25a30..59e2facd9d 100644
--- a/setup.c
+++ b/setup.c
@@ -1274,18 +1274,10 @@ const char *setup_git_directory_gently(int *nongit_ok)
 	 * the GIT_PREFIX environment variable must always match. For details
 	 * see Documentation/config/alias.txt.
 	 */
-	if (nongit_ok && *nongit_ok) {
+	if (nongit_ok && *nongit_ok)
 		startup_info->have_repository = 0;
-		startup_info->prefix = NULL;
-		setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
-	} else {
+	else
 		startup_info->have_repository = 1;
-		startup_info->prefix = prefix;
-		if (prefix)
-			setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
-		else
-			setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
-	}

 	/*
 	 * Not all paths through the setup code will call 'set_git_dir()' (which
@@ -1311,6 +1303,22 @@ const char *setup_git_directory_gently(int *nongit_ok)
 		if (startup_info->have_repository)
 			repo_set_hash_algo(the_repository, repo_fmt.hash_algo);
 	}
+	/*
+	 * Since precompose_string_if_needed() needs to look at
+	 * the core.precomposeunicode configuration, this
+	 * has to happen after the above block that finds
+	 * out where the repository is, i.e. a preparation
+	 * for calling git_config_get_bool().
+	 */
+	if (prefix) {
+		prefix = precompose_string_if_needed(prefix);
+		startup_info->prefix = prefix;
+		setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
+	} else {
+		startup_info->prefix = NULL;
+		setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
+	}
+

 	strbuf_release(&dir);
 	strbuf_release(&gitdir);
--
2.30.0.155.g66e871b664