rev-parse: add --show-superproject-working-tree
In some situations it is useful to know if the given repository
is a submodule of another repository.
Add the flag --show-superproject-working-tree to git-rev-parse
to make it easy to find out if there is a superproject. When no
superproject exists, the output will be empty.
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/submodule.c b/submodule.c
index 3b98766..bb40565 100644
--- a/submodule.c
+++ b/submodule.c
@@ -1514,3 +1514,85 @@ void absorb_git_dir_into_superproject(const char *prefix,
strbuf_release(&sb);
}
}
+
+const char *get_superproject_working_tree(void)
+{
+ struct child_process cp = CHILD_PROCESS_INIT;
+ struct strbuf sb = STRBUF_INIT;
+ const char *one_up = real_path_if_valid("../");
+ const char *cwd = xgetcwd();
+ const char *ret = NULL;
+ const char *subpath;
+ int code;
+ ssize_t len;
+
+ if (!is_inside_work_tree())
+ /*
+ * FIXME:
+ * We might have a superproject, but it is harder
+ * to determine.
+ */
+ return NULL;
+
+ if (!one_up)
+ return NULL;
+
+ subpath = relative_path(cwd, one_up, &sb);
+
+ prepare_submodule_repo_env(&cp.env_array);
+ argv_array_pop(&cp.env_array);
+
+ argv_array_pushl(&cp.args, "--literal-pathspecs", "-C", "..",
+ "ls-files", "-z", "--stage", "--full-name", "--",
+ subpath, NULL);
+ strbuf_reset(&sb);
+
+ cp.no_stdin = 1;
+ cp.no_stderr = 1;
+ cp.out = -1;
+ cp.git_cmd = 1;
+
+ if (start_command(&cp))
+ die(_("could not start ls-files in .."));
+
+ len = strbuf_read(&sb, cp.out, PATH_MAX);
+ close(cp.out);
+
+ if (starts_with(sb.buf, "160000")) {
+ int super_sub_len;
+ int cwd_len = strlen(cwd);
+ char *super_sub, *super_wt;
+
+ /*
+ * There is a superproject having this repo as a submodule.
+ * The format is <mode> SP <hash> SP <stage> TAB <full name> \0,
+ * We're only interested in the name after the tab.
+ */
+ super_sub = strchr(sb.buf, '\t') + 1;
+ super_sub_len = sb.buf + sb.len - super_sub - 1;
+
+ if (super_sub_len > cwd_len ||
+ strcmp(&cwd[cwd_len - super_sub_len], super_sub))
+ die (_("BUG: returned path string doesn't match cwd?"));
+
+ super_wt = xstrdup(cwd);
+ super_wt[cwd_len - super_sub_len] = '\0';
+
+ ret = real_path(super_wt);
+ free(super_wt);
+ }
+ strbuf_release(&sb);
+
+ code = finish_command(&cp);
+
+ if (code == 128)
+ /* '../' is not a git repository */
+ return NULL;
+ if (code == 0 && len == 0)
+ /* There is an unrelated git repository at '../' */
+ return NULL;
+ if (code)
+ die(_("ls-tree returned unexpected return code %d"), code);
+
+ return ret;
+}
