mirror of
https://github.com/git/git
synced 2024-08-24 10:15:51 +00:00
![Nguyễn Thái Ngọc Duy](/assets/img/avatar_default.png)
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
220 lines
5.5 KiB
C
220 lines
5.5 KiB
C
#include "cache.h"
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#include "refs.h"
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#include "strbuf.h"
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#include "worktree.h"
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void free_worktrees(struct worktree **worktrees)
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{
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int i = 0;
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for (i = 0; worktrees[i]; i++) {
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free(worktrees[i]->path);
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free(worktrees[i]->git_dir);
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free(worktrees[i]->head_ref);
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free(worktrees[i]);
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}
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free (worktrees);
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}
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/*
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* read 'path_to_ref' into 'ref'. Also if is_detached is not NULL,
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* set is_detached to 1 (0) if the ref is detatched (is not detached).
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*
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* $GIT_COMMON_DIR/$symref (e.g. HEAD) is practically outside $GIT_DIR so
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* for linked worktrees, `resolve_ref_unsafe()` won't work (it uses
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* git_path). Parse the ref ourselves.
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*
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* return -1 if the ref is not a proper ref, 0 otherwise (success)
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*/
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static int parse_ref(char *path_to_ref, struct strbuf *ref, int *is_detached)
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{
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if (is_detached)
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*is_detached = 0;
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if (!strbuf_readlink(ref, path_to_ref, 0)) {
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/* HEAD is symbolic link */
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if (!starts_with(ref->buf, "refs/") ||
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check_refname_format(ref->buf, 0))
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return -1;
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} else if (strbuf_read_file(ref, path_to_ref, 0) >= 0) {
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/* textual symref or detached */
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if (!starts_with(ref->buf, "ref:")) {
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if (is_detached)
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*is_detached = 1;
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} else {
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strbuf_remove(ref, 0, strlen("ref:"));
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strbuf_trim(ref);
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if (check_refname_format(ref->buf, 0))
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return -1;
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}
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} else
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return -1;
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return 0;
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}
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/**
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* Add the head_sha1 and head_ref (if not detached) to the given worktree
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*/
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static void add_head_info(struct strbuf *head_ref, struct worktree *worktree)
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{
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if (head_ref->len) {
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if (worktree->is_detached) {
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get_sha1_hex(head_ref->buf, worktree->head_sha1);
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} else {
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resolve_ref_unsafe(head_ref->buf, 0, worktree->head_sha1, NULL);
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worktree->head_ref = strbuf_detach(head_ref, NULL);
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}
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}
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}
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/**
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* get the main worktree
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*/
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static struct worktree *get_main_worktree(void)
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{
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struct worktree *worktree = NULL;
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struct strbuf path = STRBUF_INIT;
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struct strbuf worktree_path = STRBUF_INIT;
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struct strbuf gitdir = STRBUF_INIT;
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struct strbuf head_ref = STRBUF_INIT;
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int is_bare = 0;
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int is_detached = 0;
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strbuf_addf(&gitdir, "%s", absolute_path(get_git_common_dir()));
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strbuf_addbuf(&worktree_path, &gitdir);
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is_bare = !strbuf_strip_suffix(&worktree_path, "/.git");
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if (is_bare)
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strbuf_strip_suffix(&worktree_path, "/.");
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strbuf_addf(&path, "%s/HEAD", get_git_common_dir());
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if (parse_ref(path.buf, &head_ref, &is_detached) < 0)
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goto done;
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worktree = xmalloc(sizeof(struct worktree));
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worktree->path = strbuf_detach(&worktree_path, NULL);
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worktree->git_dir = strbuf_detach(&gitdir, NULL);
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worktree->is_bare = is_bare;
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worktree->head_ref = NULL;
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worktree->is_detached = is_detached;
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add_head_info(&head_ref, worktree);
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done:
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strbuf_release(&path);
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strbuf_release(&gitdir);
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strbuf_release(&worktree_path);
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strbuf_release(&head_ref);
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return worktree;
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}
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static struct worktree *get_linked_worktree(const char *id)
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{
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struct worktree *worktree = NULL;
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struct strbuf path = STRBUF_INIT;
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struct strbuf worktree_path = STRBUF_INIT;
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struct strbuf gitdir = STRBUF_INIT;
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struct strbuf head_ref = STRBUF_INIT;
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int is_detached = 0;
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if (!id)
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die("Missing linked worktree name");
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strbuf_addf(&gitdir, "%s/worktrees/%s",
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absolute_path(get_git_common_dir()), id);
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strbuf_addf(&path, "%s/gitdir", gitdir.buf);
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if (strbuf_read_file(&worktree_path, path.buf, 0) <= 0)
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/* invalid gitdir file */
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goto done;
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strbuf_rtrim(&worktree_path);
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if (!strbuf_strip_suffix(&worktree_path, "/.git")) {
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strbuf_reset(&worktree_path);
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strbuf_addstr(&worktree_path, absolute_path("."));
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strbuf_strip_suffix(&worktree_path, "/.");
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}
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strbuf_reset(&path);
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strbuf_addf(&path, "%s/worktrees/%s/HEAD", get_git_common_dir(), id);
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if (parse_ref(path.buf, &head_ref, &is_detached) < 0)
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goto done;
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worktree = xmalloc(sizeof(struct worktree));
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worktree->path = strbuf_detach(&worktree_path, NULL);
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worktree->git_dir = strbuf_detach(&gitdir, NULL);
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worktree->is_bare = 0;
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worktree->head_ref = NULL;
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worktree->is_detached = is_detached;
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add_head_info(&head_ref, worktree);
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done:
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strbuf_release(&path);
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strbuf_release(&gitdir);
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strbuf_release(&worktree_path);
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strbuf_release(&head_ref);
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return worktree;
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}
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struct worktree **get_worktrees(void)
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{
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struct worktree **list = NULL;
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struct strbuf path = STRBUF_INIT;
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DIR *dir;
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struct dirent *d;
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int counter = 0, alloc = 2;
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list = xmalloc(alloc * sizeof(struct worktree *));
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if ((list[counter] = get_main_worktree()))
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counter++;
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strbuf_addf(&path, "%s/worktrees", get_git_common_dir());
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dir = opendir(path.buf);
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strbuf_release(&path);
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if (dir) {
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while ((d = readdir(dir)) != NULL) {
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struct worktree *linked = NULL;
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if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
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continue;
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if ((linked = get_linked_worktree(d->d_name))) {
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ALLOC_GROW(list, counter + 1, alloc);
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list[counter++] = linked;
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}
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}
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closedir(dir);
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}
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ALLOC_GROW(list, counter + 1, alloc);
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list[counter] = NULL;
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return list;
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}
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char *find_shared_symref(const char *symref, const char *target)
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{
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char *existing = NULL;
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struct strbuf path = STRBUF_INIT;
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struct strbuf sb = STRBUF_INIT;
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struct worktree **worktrees = get_worktrees();
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int i = 0;
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for (i = 0; worktrees[i]; i++) {
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strbuf_reset(&path);
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strbuf_reset(&sb);
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strbuf_addf(&path, "%s/%s", worktrees[i]->git_dir, symref);
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if (parse_ref(path.buf, &sb, NULL)) {
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continue;
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}
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if (!strcmp(sb.buf, target)) {
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existing = xstrdup(worktrees[i]->path);
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break;
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}
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}
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strbuf_release(&path);
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strbuf_release(&sb);
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free_worktrees(worktrees);
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return existing;
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}
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