test_cmp: do not use "diff -u" on platforms that lack one

diff --git a/submodule.c b/submodule.c
index b3b8bc147909f81be6a387318ad0601dae50460f..676d48fb33119f393befcaf8998ad38741366525 100644 (file)
--- a/submodule.c
+++ b/submodule.c
@@ -12,8 +12,15 @@ static int add_submodule_odb(const char *path)
        struct strbuf objects_directory = STRBUF_INIT;
        struct alternate_object_database *alt_odb;
        int ret = 0;
+       const char *git_dir;
 
-       strbuf_addf(&objects_directory, "%s/.git/objects/", path);
+       strbuf_addf(&objects_directory, "%s/.git", path);
+       git_dir = read_gitfile_gently(objects_directory.buf);
+       if (git_dir) {
+               strbuf_reset(&objects_directory);
+               strbuf_addstr(&objects_directory, git_dir);
+       }
+       strbuf_addstr(&objects_directory, "/objects/");
        if (!is_directory(objects_directory.buf)) {
                ret = -1;
                goto done;
@@ -132,7 +139,6 @@ void show_submodule_summary(FILE *f, const char *path,
 
 unsigned is_submodule_modified(const char *path, int ignore_untracked)
 {
-       int i;
        ssize_t len;
        struct child_process cp;
        const char *argv[] = {
@@ -141,16 +147,16 @@ unsigned is_submodule_modified(const char *path, int ignore_untracked)
                NULL,
                NULL,
        };
-       const char *env[LOCAL_REPO_ENV_SIZE + 3];
        struct strbuf buf = STRBUF_INIT;
        unsigned dirty_submodule = 0;
        const char *line, *next_line;
+       const char *git_dir;
 
-       for (i = 0; i < LOCAL_REPO_ENV_SIZE; i++)
-               env[i] = local_repo_env[i];
-
-       strbuf_addf(&buf, "%s/.git/", path);
-       if (!is_directory(buf.buf)) {
+       strbuf_addf(&buf, "%s/.git", path);
+       git_dir = read_gitfile_gently(buf.buf);
+       if (!git_dir)
+               git_dir = buf.buf;
+       if (!is_directory(git_dir)) {
                strbuf_release(&buf);
                /* The submodule is not checked out, so it is not modified */
                return 0;
@@ -158,21 +164,16 @@ unsigned is_submodule_modified(const char *path, int ignore_untracked)
        }
        strbuf_reset(&buf);
 
-       strbuf_addf(&buf, "GIT_WORK_TREE=%s", path);
-       env[i++] = strbuf_detach(&buf, NULL);
-       strbuf_addf(&buf, "GIT_DIR=%s/.git", path);
-       env[i++] = strbuf_detach(&buf, NULL);
-       env[i] = NULL;
-
        if (ignore_untracked)
                argv[2] = "-uno";
 
        memset(&cp, 0, sizeof(cp));
        cp.argv = argv;
-       cp.env = env;
+       cp.env = local_repo_env;
        cp.git_cmd = 1;
        cp.no_stdin = 1;
        cp.out = -1;
+       cp.dir = path;
        if (start_command(&cp))
                die("Could not run git status --porcelain");
 
@@ -201,8 +202,6 @@ unsigned is_submodule_modified(const char *path, int ignore_untracked)
        if (finish_command(&cp))
                die("git status --porcelain failed");
 
-       for (i = LOCAL_REPO_ENV_SIZE; env[i]; i++)
-               free((char *)env[i]);
        strbuf_release(&buf);
        return dirty_submodule;
 }