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#include "cache.h"
#include "refs.h"
#include "strbuf.h"
#include "worktree.h"
void free_worktrees(struct worktree **worktrees)
{
int i = 0;
for (i = 0; worktrees[i]; i++) {
free(worktrees[i]->path);
free(worktrees[i]);
}
free (worktrees);
}
/*
* read 'path_to_ref' into 'ref'. Also if is_detached is not NULL,
* set is_detached to 1 (0) if the ref is detatched (is not detached).
*
* $GIT_COMMON_DIR/$symref (e.g. HEAD) is practically outside $GIT_DIR so
* for linked worktrees, `resolve_ref_unsafe()` won't work (it uses
* git_path). Parse the ref ourselves.
*
* return -1 if the ref is not a proper ref, 0 otherwise (success)
*/
static int parse_ref(char *path_to_ref, struct strbuf *ref, int *is_detached)
{
if (is_detached)
*is_detached = 0;
if (!strbuf_readlink(ref, path_to_ref, 0)) {
/* HEAD is symbolic link */
if (!starts_with(ref->buf, "refs/") ||
check_refname_format(ref->buf, 0))
return -1;
} else if (strbuf_read_file(ref, path_to_ref, 0) >= 0) {
/* textual symref or detached */
if (!starts_with(ref->buf, "ref:")) {
if (is_detached)
*is_detached = 1;
} else {
strbuf_remove(ref, 0, strlen("ref:"));
strbuf_trim(ref);
if (check_refname_format(ref->buf, 0))
return -1;
}
} else
return -1;
return 0;
}
/**
* get the main worktree
*/
static struct worktree *get_main_worktree(void)
{
struct worktree *worktree = NULL;
struct strbuf path = STRBUF_INIT;
struct strbuf worktree_path = STRBUF_INIT;
struct strbuf gitdir = STRBUF_INIT;
struct strbuf head_ref = STRBUF_INIT;
strbuf_addf(&gitdir, "%s", absolute_path(get_git_common_dir()));
strbuf_addbuf(&worktree_path, &gitdir);
if (!strbuf_strip_suffix(&worktree_path, "/.git"))
strbuf_strip_suffix(&worktree_path, "/.");
strbuf_addf(&path, "%s/HEAD", get_git_common_dir());
if (parse_ref(path.buf, &head_ref, NULL) >= 0) {
worktree = xmalloc(sizeof(struct worktree));
worktree->path = strbuf_detach(&worktree_path, NULL);
worktree->git_dir = strbuf_detach(&gitdir, NULL);
}
strbuf_release(&path);
strbuf_release(&gitdir);
strbuf_release(&worktree_path);
strbuf_release(&head_ref);
return worktree;
}
static struct worktree *get_linked_worktree(const char *id)
{
struct worktree *worktree = NULL;
struct strbuf path = STRBUF_INIT;
struct strbuf worktree_path = STRBUF_INIT;
struct strbuf gitdir = STRBUF_INIT;
struct strbuf head_ref = STRBUF_INIT;
if (!id)
die("Missing linked worktree name");
strbuf_addf(&gitdir, "%s/worktrees/%s",
absolute_path(get_git_common_dir()), id);
strbuf_addf(&path, "%s/gitdir", gitdir.buf);
if (strbuf_read_file(&worktree_path, path.buf, 0) <= 0)
/* invalid gitdir file */
goto done;
strbuf_rtrim(&worktree_path);
if (!strbuf_strip_suffix(&worktree_path, "/.git")) {
strbuf_reset(&worktree_path);
strbuf_addstr(&worktree_path, absolute_path("."));
strbuf_strip_suffix(&worktree_path, "/.");
}
strbuf_reset(&path);
strbuf_addf(&path, "%s/worktrees/%s/HEAD", get_git_common_dir(), id);
if (parse_ref(path.buf, &head_ref, NULL) >= 0) {
worktree = xmalloc(sizeof(struct worktree));
worktree->path = strbuf_detach(&worktree_path, NULL);
worktree->git_dir = strbuf_detach(&gitdir, NULL);
}
done:
strbuf_release(&path);
strbuf_release(&gitdir);
strbuf_release(&worktree_path);
strbuf_release(&head_ref);
return worktree;
}
struct worktree **get_worktrees(void)
{
struct worktree **list = NULL;
struct strbuf path = STRBUF_INIT;
DIR *dir;
struct dirent *d;
int counter = 0, alloc = 2;
list = xmalloc(alloc * sizeof(struct worktree *));
if ((list[counter] = get_main_worktree()))
counter++;
strbuf_addf(&path, "%s/worktrees", get_git_common_dir());
dir = opendir(path.buf);
strbuf_release(&path);
if (dir) {
while ((d = readdir(dir)) != NULL) {
struct worktree *linked = NULL;
if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
continue;
if ((linked = get_linked_worktree(d->d_name))) {
ALLOC_GROW(list, counter + 1, alloc);
list[counter++] = linked;
}
}
closedir(dir);
}
ALLOC_GROW(list, counter + 1, alloc);
list[counter] = NULL;
return list;
}
char *find_shared_symref(const char *symref, const char *target)
{
char *existing = NULL;
struct strbuf path = STRBUF_INIT;
struct strbuf sb = STRBUF_INIT;
struct worktree **worktrees = get_worktrees();
int i = 0;
for (i = 0; worktrees[i]; i++) {
strbuf_reset(&path);
strbuf_reset(&sb);
strbuf_addf(&path, "%s/%s", worktrees[i]->git_dir, symref);
if (parse_ref(path.buf, &sb, NULL)) {
continue;
}
if (!strcmp(sb.buf, target)) {
existing = xstrdup(worktrees[i]->path);
break;
}
}
strbuf_release(&path);
strbuf_release(&sb);
free_worktrees(worktrees);
return existing;
}
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