git/worktree.c

306 строки
7.4 KiB
C

#include "cache.h"
#include "refs.h"
#include "strbuf.h"
#include "worktree.h"
#include "dir.h"
#include "wt-status.h"
void free_worktrees(struct worktree **worktrees)
{
int i = 0;
for (i = 0; worktrees[i]; i++) {
free(worktrees[i]->path);
free(worktrees[i]->id);
free(worktrees[i]->head_ref);
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 detached (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;
}
/**
* Add the head_sha1 and head_ref (if not detached) to the given worktree
*/
static void add_head_info(struct strbuf *head_ref, struct worktree *worktree)
{
if (head_ref->len) {
if (worktree->is_detached) {
get_sha1_hex(head_ref->buf, worktree->head_sha1);
} else {
resolve_ref_unsafe(head_ref->buf, 0, worktree->head_sha1, NULL);
worktree->head_ref = strbuf_detach(head_ref, NULL);
}
}
}
/**
* 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 head_ref = STRBUF_INIT;
int is_bare = 0;
int is_detached = 0;
strbuf_addstr(&worktree_path, absolute_path(get_git_common_dir()));
is_bare = !strbuf_strip_suffix(&worktree_path, "/.git");
if (is_bare)
strbuf_strip_suffix(&worktree_path, "/.");
strbuf_addf(&path, "%s/HEAD", get_git_common_dir());
if (parse_ref(path.buf, &head_ref, &is_detached) < 0)
goto done;
worktree = xmalloc(sizeof(struct worktree));
worktree->path = strbuf_detach(&worktree_path, NULL);
worktree->id = NULL;
worktree->is_bare = is_bare;
worktree->head_ref = NULL;
worktree->is_detached = is_detached;
worktree->is_current = 0;
add_head_info(&head_ref, worktree);
done:
strbuf_release(&path);
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 head_ref = STRBUF_INIT;
int is_detached = 0;
if (!id)
die("Missing linked worktree name");
strbuf_git_common_path(&path, "worktrees/%s/gitdir", id);
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, &is_detached) < 0)
goto done;
worktree = xmalloc(sizeof(struct worktree));
worktree->path = strbuf_detach(&worktree_path, NULL);
worktree->id = xstrdup(id);
worktree->is_bare = 0;
worktree->head_ref = NULL;
worktree->is_detached = is_detached;
worktree->is_current = 0;
add_head_info(&head_ref, worktree);
done:
strbuf_release(&path);
strbuf_release(&worktree_path);
strbuf_release(&head_ref);
return worktree;
}
static void mark_current_worktree(struct worktree **worktrees)
{
struct strbuf git_dir = STRBUF_INIT;
struct strbuf path = STRBUF_INIT;
int i;
strbuf_addstr(&git_dir, absolute_path(get_git_dir()));
for (i = 0; worktrees[i]; i++) {
struct worktree *wt = worktrees[i];
strbuf_addstr(&path, absolute_path(get_worktree_git_dir(wt)));
wt->is_current = !fspathcmp(git_dir.buf, path.buf);
strbuf_reset(&path);
if (wt->is_current)
break;
}
strbuf_release(&git_dir);
strbuf_release(&path);
}
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;
mark_current_worktree(list);
return list;
}
const char *get_worktree_git_dir(const struct worktree *wt)
{
if (!wt)
return get_git_dir();
else if (!wt->id)
return get_git_common_dir();
else
return git_common_path("worktrees/%s", wt->id);
}
int is_worktree_being_rebased(const struct worktree *wt,
const char *target)
{
struct wt_status_state state;
int found_rebase;
memset(&state, 0, sizeof(state));
found_rebase = wt_status_check_rebase(wt, &state) &&
((state.rebase_in_progress ||
state.rebase_interactive_in_progress) &&
state.branch &&
starts_with(target, "refs/heads/") &&
!strcmp(state.branch, target + strlen("refs/heads/")));
free(state.branch);
free(state.onto);
return found_rebase;
}
int is_worktree_being_bisected(const struct worktree *wt,
const char *target)
{
struct wt_status_state state;
int found_rebase;
memset(&state, 0, sizeof(state));
found_rebase = wt_status_check_bisect(wt, &state) &&
state.branch &&
starts_with(target, "refs/heads/") &&
!strcmp(state.branch, target + strlen("refs/heads/"));
free(state.branch);
return found_rebase;
}
/*
* note: this function should be able to detect shared symref even if
* HEAD is temporarily detached (e.g. in the middle of rebase or
* bisect). New commands that do similar things should update this
* function as well.
*/
const struct worktree *find_shared_symref(const char *symref,
const char *target)
{
const struct worktree *existing = NULL;
struct strbuf path = STRBUF_INIT;
struct strbuf sb = STRBUF_INIT;
static struct worktree **worktrees;
int i = 0;
if (worktrees)
free_worktrees(worktrees);
worktrees = get_worktrees();
for (i = 0; worktrees[i]; i++) {
struct worktree *wt = worktrees[i];
if (wt->is_detached && !strcmp(symref, "HEAD")) {
if (is_worktree_being_rebased(wt, target)) {
existing = wt;
break;
}
if (is_worktree_being_bisected(wt, target)) {
existing = wt;
break;
}
}
strbuf_reset(&path);
strbuf_reset(&sb);
strbuf_addf(&path, "%s/%s",
get_worktree_git_dir(wt),
symref);
if (parse_ref(path.buf, &sb, NULL)) {
continue;
}
if (!strcmp(sb.buf, target)) {
existing = wt;
break;
}
}
strbuf_release(&path);
strbuf_release(&sb);
return existing;
}