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authorStefan Beller <sbeller@google.com>2016-12-12 11:04:33 -0800
committerJunio C Hamano <gitster@pobox.com>2016-12-12 15:15:07 -0800
commit1a248cf21d450eb911d01a89c84412c2da365e66 (patch)
tree4eb4fdd12c9a35accddac60c40bee0413a6e14a8 /worktree.c
parent6f94351b0a4dd107623a35dc9081bf31c7ddac88 (diff)
downloadgit-1a248cf21d450eb911d01a89c84412c2da365e66.tar.gz
worktree: check if a submodule uses worktrees
In a later patch we want to move around the the git directory of a submodule. Both submodules as well as worktrees are involved in placing git directories at unusual places, so their functionality may collide. To react appropriately to situations where worktrees in submodules are in use, offer a new function to query the a submodule if it uses the worktree feature. An earlier approach: "Implement submodule_get_worktrees and just count them", however: This can be done cheaply (both in new code to write as well as run time) by obtaining the list of worktrees based off that submodules git directory. However as we have loaded the variables for the current repository, the values in the submodule worktree can be wrong, e.g. * core.ignorecase may differ between these two repositories * the ref resolution is broken (refs/heads/branch in the submodule resolves to the sha1 value of the `branch` in the current repository that may not exist or have another sha1) The implementation here is just checking for any files in $GIT_COMMON_DIR/worktrees for the submodule, which ought to be sufficient if the submodule is using the current repository format, which we also check. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'worktree.c')
-rw-r--r--worktree.c50
1 files changed, 50 insertions, 0 deletions
diff --git a/worktree.c b/worktree.c
index eb6121263b..d4606aa8cd 100644
--- a/worktree.c
+++ b/worktree.c
@@ -380,3 +380,53 @@ const struct worktree *find_shared_symref(const char *symref,
return existing;
}
+
+int submodule_uses_worktrees(const char *path)
+{
+ char *submodule_gitdir;
+ struct strbuf sb = STRBUF_INIT;
+ DIR *dir;
+ struct dirent *d;
+ int ret;
+ struct repository_format format;
+
+ submodule_gitdir = git_pathdup_submodule(path, "%s", "");
+ if (!submodule_gitdir)
+ return 0;
+
+ /* The env would be set for the superproject. */
+ get_common_dir_noenv(&sb, submodule_gitdir);
+
+ /*
+ * The check below is only known to be good for repository format
+ * version 0 at the time of writing this code.
+ */
+ strbuf_addstr(&sb, "/config");
+ read_repository_format(&format, sb.buf);
+ if (format.version != 0) {
+ strbuf_release(&sb);
+ return 1;
+ }
+
+ /* Replace config by worktrees. */
+ strbuf_setlen(&sb, sb.len - strlen("config"));
+ strbuf_addstr(&sb, "worktrees");
+
+ /* See if there is any file inside the worktrees directory. */
+ dir = opendir(sb.buf);
+ strbuf_release(&sb);
+ free(submodule_gitdir);
+
+ if (!dir)
+ return 0;
+
+ while ((d = readdir(dir)) != NULL) {
+ if (is_dot_or_dotdot(d->d_name))
+ continue;
+
+ ret = 1;
+ break;
+ }
+ closedir(dir);
+ return ret;
+}