From bf0231c66140be5194ac76a4a9f79e949c588293 Mon Sep 17 00:00:00 2001 From: Stefan Beller Date: Wed, 8 Mar 2017 15:07:42 -0800 Subject: 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 Signed-off-by: Junio C Hamano --- submodule.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) (limited to 'submodule.c') diff --git a/submodule.c b/submodule.c index 3b98766a6..bb405653f 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 SP SP TAB \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; +} -- cgit v1.2.1