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![Eric Sunshine](/assets/img/avatar_default.png)
Although "git worktree add" learned to run the 'post-checkout' hook inade546be47
(worktree: invoke post-checkout hook, 2017-12-07), it neglected to change to the directory of the newly-created worktree before running the hook. Instead, the hook runs within the directory from which the "git worktree add" command itself was invoked, which effectively neuters the hook since it knows nothing about the new worktree directory. Further,ade546be47
failed to sanitize the environment before running the hook, which means that user-assigned values of GIT_DIR and GIT_WORK_TREE could mislead the hook about the location of the new worktree. In the case of "git worktree add" being run from a bare repository, the GIT_DIR="." assigned by Git itself leaks into the hook's environment and breaks Git commands; this is so even when the working directory is correctly changed to the new worktree before the hook runs since ".", relative to the new worktree directory, does not point at the bare repository. Fix these problems by (1) changing to the new worktree's directory before running the hook, and (2) sanitizing the environment of GIT_DIR and GIT_WORK_TREE so hooks can't be confused by misleading values. Enhance the t2025 'post-checkout' tests to verify that the hook is indeed run within the correct directory and that Git commands invoked by the hook compute Git-dir and top-level worktree locations correctly. While at it, also add two new tests: (1) verify that the hook is run within the correct directory even when the new worktree is created from a sibling worktree (as opposed to the main worktree); (2) verify that the hook is provided with correct context when the new worktree is created from a bare repository (test provided by Lars Schneider). Implementation Notes: Rather than sanitizing the environment of GIT_DIR and GIT_WORK_TREE, an alternative would be to set them explicitly, as is already done for other Git commands run internally by "git worktree add". This patch opts instead to sanitize the environment in order to clearly document that the worktree is fully functional by the time the hook is run, thus does not require special environmental overrides. The hook is run manually, rather than via run_hook_le(), since it needs to change the working directory to that of the worktree, and run_hook_le() does not provide such functionality. As this is a one-off case, adding 'run_hook' overloads which allow the directory to be set does not seem warranted at this time. Reported-by: Lars Schneider <larsxschneider@gmail.com> Signed-off-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
602 lines
15 KiB
C
602 lines
15 KiB
C
#include "cache.h"
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#include "config.h"
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#include "builtin.h"
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#include "dir.h"
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#include "parse-options.h"
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#include "argv-array.h"
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#include "branch.h"
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#include "refs.h"
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#include "run-command.h"
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#include "sigchain.h"
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#include "refs.h"
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#include "utf8.h"
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#include "worktree.h"
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static const char * const worktree_usage[] = {
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N_("git worktree add [<options>] <path> [<branch>]"),
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N_("git worktree list [<options>]"),
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N_("git worktree lock [<options>] <path>"),
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N_("git worktree prune [<options>]"),
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N_("git worktree unlock <path>"),
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NULL
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};
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struct add_opts {
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int force;
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int detach;
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int checkout;
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int keep_locked;
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const char *new_branch;
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int force_new_branch;
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};
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static int show_only;
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static int verbose;
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static timestamp_t expire;
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static int prune_worktree(const char *id, struct strbuf *reason)
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{
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struct stat st;
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char *path;
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int fd;
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size_t len;
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ssize_t read_result;
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if (!is_directory(git_path("worktrees/%s", id))) {
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strbuf_addf(reason, _("Removing worktrees/%s: not a valid directory"), id);
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return 1;
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}
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if (file_exists(git_path("worktrees/%s/locked", id)))
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return 0;
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if (stat(git_path("worktrees/%s/gitdir", id), &st)) {
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strbuf_addf(reason, _("Removing worktrees/%s: gitdir file does not exist"), id);
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return 1;
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}
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fd = open(git_path("worktrees/%s/gitdir", id), O_RDONLY);
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if (fd < 0) {
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strbuf_addf(reason, _("Removing worktrees/%s: unable to read gitdir file (%s)"),
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id, strerror(errno));
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return 1;
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}
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len = xsize_t(st.st_size);
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path = xmallocz(len);
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read_result = read_in_full(fd, path, len);
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if (read_result < 0) {
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strbuf_addf(reason, _("Removing worktrees/%s: unable to read gitdir file (%s)"),
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id, strerror(errno));
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close(fd);
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free(path);
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return 1;
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}
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close(fd);
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if (read_result != len) {
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strbuf_addf(reason,
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_("Removing worktrees/%s: short read (expected %"PRIuMAX" bytes, read %"PRIuMAX")"),
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id, (uintmax_t)len, (uintmax_t)read_result);
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free(path);
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return 1;
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}
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while (len && (path[len - 1] == '\n' || path[len - 1] == '\r'))
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len--;
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if (!len) {
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strbuf_addf(reason, _("Removing worktrees/%s: invalid gitdir file"), id);
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free(path);
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return 1;
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}
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path[len] = '\0';
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if (!file_exists(path)) {
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struct stat st_link;
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free(path);
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/*
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* the repo is moved manually and has not been
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* accessed since?
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*/
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if (!stat(git_path("worktrees/%s/link", id), &st_link) &&
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st_link.st_nlink > 1)
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return 0;
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if (st.st_mtime <= expire) {
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strbuf_addf(reason, _("Removing worktrees/%s: gitdir file points to non-existent location"), id);
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return 1;
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} else {
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return 0;
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}
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}
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free(path);
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return 0;
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}
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static void prune_worktrees(void)
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{
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struct strbuf reason = STRBUF_INIT;
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struct strbuf path = STRBUF_INIT;
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DIR *dir = opendir(git_path("worktrees"));
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struct dirent *d;
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int ret;
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if (!dir)
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return;
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while ((d = readdir(dir)) != NULL) {
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if (is_dot_or_dotdot(d->d_name))
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continue;
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strbuf_reset(&reason);
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if (!prune_worktree(d->d_name, &reason))
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continue;
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if (show_only || verbose)
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printf("%s\n", reason.buf);
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if (show_only)
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continue;
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git_path_buf(&path, "worktrees/%s", d->d_name);
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ret = remove_dir_recursively(&path, 0);
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if (ret < 0 && errno == ENOTDIR)
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ret = unlink(path.buf);
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if (ret)
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error_errno(_("failed to remove '%s'"), path.buf);
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}
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closedir(dir);
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if (!show_only)
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rmdir(git_path("worktrees"));
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strbuf_release(&reason);
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strbuf_release(&path);
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}
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static int prune(int ac, const char **av, const char *prefix)
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{
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struct option options[] = {
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OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
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OPT__VERBOSE(&verbose, N_("report pruned working trees")),
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OPT_EXPIRY_DATE(0, "expire", &expire,
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N_("expire working trees older than <time>")),
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OPT_END()
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};
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expire = TIME_MAX;
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ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
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if (ac)
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usage_with_options(worktree_usage, options);
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prune_worktrees();
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return 0;
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}
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static char *junk_work_tree;
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static char *junk_git_dir;
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static int is_junk;
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static pid_t junk_pid;
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static void remove_junk(void)
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{
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struct strbuf sb = STRBUF_INIT;
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if (!is_junk || getpid() != junk_pid)
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return;
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if (junk_git_dir) {
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strbuf_addstr(&sb, junk_git_dir);
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remove_dir_recursively(&sb, 0);
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strbuf_reset(&sb);
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}
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if (junk_work_tree) {
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strbuf_addstr(&sb, junk_work_tree);
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remove_dir_recursively(&sb, 0);
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}
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strbuf_release(&sb);
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}
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static void remove_junk_on_signal(int signo)
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{
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remove_junk();
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sigchain_pop(signo);
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raise(signo);
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}
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static const char *worktree_basename(const char *path, int *olen)
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{
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const char *name;
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int len;
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len = strlen(path);
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while (len && is_dir_sep(path[len - 1]))
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len--;
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for (name = path + len - 1; name > path; name--)
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if (is_dir_sep(*name)) {
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name++;
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break;
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}
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*olen = len;
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return name;
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}
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static int add_worktree(const char *path, const char *refname,
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const struct add_opts *opts)
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{
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struct strbuf sb_git = STRBUF_INIT, sb_repo = STRBUF_INIT;
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struct strbuf sb = STRBUF_INIT;
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const char *name;
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struct stat st;
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struct child_process cp = CHILD_PROCESS_INIT;
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struct argv_array child_env = ARGV_ARRAY_INIT;
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int counter = 0, len, ret;
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struct strbuf symref = STRBUF_INIT;
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struct commit *commit = NULL;
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int is_branch = 0;
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if (file_exists(path) && !is_empty_dir(path))
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die(_("'%s' already exists"), path);
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/* is 'refname' a branch or commit? */
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if (!opts->detach && !strbuf_check_branch_ref(&symref, refname) &&
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ref_exists(symref.buf)) {
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is_branch = 1;
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if (!opts->force)
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die_if_checked_out(symref.buf, 0);
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}
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commit = lookup_commit_reference_by_name(refname);
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if (!commit)
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die(_("invalid reference: %s"), refname);
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name = worktree_basename(path, &len);
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git_path_buf(&sb_repo, "worktrees/%.*s", (int)(path + len - name), name);
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len = sb_repo.len;
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if (safe_create_leading_directories_const(sb_repo.buf))
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die_errno(_("could not create leading directories of '%s'"),
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sb_repo.buf);
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while (!stat(sb_repo.buf, &st)) {
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counter++;
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strbuf_setlen(&sb_repo, len);
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strbuf_addf(&sb_repo, "%d", counter);
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}
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name = strrchr(sb_repo.buf, '/') + 1;
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junk_pid = getpid();
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atexit(remove_junk);
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sigchain_push_common(remove_junk_on_signal);
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if (mkdir(sb_repo.buf, 0777))
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die_errno(_("could not create directory of '%s'"), sb_repo.buf);
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junk_git_dir = xstrdup(sb_repo.buf);
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is_junk = 1;
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/*
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* lock the incomplete repo so prune won't delete it, unlock
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* after the preparation is over.
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*/
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strbuf_addf(&sb, "%s/locked", sb_repo.buf);
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if (!opts->keep_locked)
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write_file(sb.buf, "initializing");
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else
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write_file(sb.buf, "added with --lock");
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strbuf_addf(&sb_git, "%s/.git", path);
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if (safe_create_leading_directories_const(sb_git.buf))
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die_errno(_("could not create leading directories of '%s'"),
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sb_git.buf);
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junk_work_tree = xstrdup(path);
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strbuf_reset(&sb);
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strbuf_addf(&sb, "%s/gitdir", sb_repo.buf);
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write_file(sb.buf, "%s", real_path(sb_git.buf));
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write_file(sb_git.buf, "gitdir: %s/worktrees/%s",
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real_path(get_git_common_dir()), name);
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/*
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* This is to keep resolve_ref() happy. We need a valid HEAD
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* or is_git_directory() will reject the directory. Any value which
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* looks like an object ID will do since it will be immediately
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* replaced by the symbolic-ref or update-ref invocation in the new
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* worktree.
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*/
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strbuf_reset(&sb);
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strbuf_addf(&sb, "%s/HEAD", sb_repo.buf);
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write_file(sb.buf, "%s", sha1_to_hex(null_sha1));
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strbuf_reset(&sb);
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strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
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write_file(sb.buf, "../..");
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fprintf_ln(stderr, _("Preparing %s (identifier %s)"), path, name);
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argv_array_pushf(&child_env, "%s=%s", GIT_DIR_ENVIRONMENT, sb_git.buf);
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argv_array_pushf(&child_env, "%s=%s", GIT_WORK_TREE_ENVIRONMENT, path);
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cp.git_cmd = 1;
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if (!is_branch)
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argv_array_pushl(&cp.args, "update-ref", "HEAD",
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oid_to_hex(&commit->object.oid), NULL);
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else
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argv_array_pushl(&cp.args, "symbolic-ref", "HEAD",
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symref.buf, NULL);
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cp.env = child_env.argv;
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ret = run_command(&cp);
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if (ret)
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goto done;
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if (opts->checkout) {
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cp.argv = NULL;
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argv_array_clear(&cp.args);
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argv_array_pushl(&cp.args, "reset", "--hard", NULL);
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cp.env = child_env.argv;
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ret = run_command(&cp);
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if (ret)
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goto done;
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}
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is_junk = 0;
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FREE_AND_NULL(junk_work_tree);
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FREE_AND_NULL(junk_git_dir);
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done:
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if (ret || !opts->keep_locked) {
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strbuf_reset(&sb);
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strbuf_addf(&sb, "%s/locked", sb_repo.buf);
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unlink_or_warn(sb.buf);
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}
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/*
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* Hook failure does not warrant worktree deletion, so run hook after
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* is_junk is cleared, but do return appropriate code when hook fails.
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*/
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if (!ret && opts->checkout) {
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const char *hook = find_hook("post-checkout");
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if (hook) {
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const char *env[] = { "GIT_DIR", "GIT_WORK_TREE", NULL };
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cp.git_cmd = 0;
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cp.no_stdin = 1;
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cp.stdout_to_stderr = 1;
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cp.dir = path;
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cp.env = env;
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cp.argv = NULL;
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argv_array_pushl(&cp.args, absolute_path(hook),
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oid_to_hex(&null_oid),
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oid_to_hex(&commit->object.oid),
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"1", NULL);
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ret = run_command(&cp);
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}
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}
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argv_array_clear(&child_env);
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strbuf_release(&sb);
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strbuf_release(&symref);
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strbuf_release(&sb_repo);
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strbuf_release(&sb_git);
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return ret;
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}
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static int add(int ac, const char **av, const char *prefix)
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{
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struct add_opts opts;
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const char *new_branch_force = NULL;
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char *path;
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const char *branch;
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struct option options[] = {
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OPT__FORCE(&opts.force, N_("checkout <branch> even if already checked out in other worktree")),
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OPT_STRING('b', NULL, &opts.new_branch, N_("branch"),
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N_("create a new branch")),
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OPT_STRING('B', NULL, &new_branch_force, N_("branch"),
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N_("create or reset a branch")),
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OPT_BOOL(0, "detach", &opts.detach, N_("detach HEAD at named commit")),
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OPT_BOOL(0, "checkout", &opts.checkout, N_("populate the new working tree")),
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OPT_BOOL(0, "lock", &opts.keep_locked, N_("keep the new working tree locked")),
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OPT_END()
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};
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memset(&opts, 0, sizeof(opts));
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opts.checkout = 1;
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ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
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if (!!opts.detach + !!opts.new_branch + !!new_branch_force > 1)
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die(_("-b, -B, and --detach are mutually exclusive"));
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if (ac < 1 || ac > 2)
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usage_with_options(worktree_usage, options);
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path = prefix_filename(prefix, av[0]);
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branch = ac < 2 ? "HEAD" : av[1];
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if (!strcmp(branch, "-"))
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branch = "@{-1}";
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opts.force_new_branch = !!new_branch_force;
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if (opts.force_new_branch) {
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struct strbuf symref = STRBUF_INIT;
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opts.new_branch = new_branch_force;
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if (!opts.force &&
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!strbuf_check_branch_ref(&symref, opts.new_branch) &&
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ref_exists(symref.buf))
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die_if_checked_out(symref.buf, 0);
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strbuf_release(&symref);
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}
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if (ac < 2 && !opts.new_branch && !opts.detach) {
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int n;
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const char *s = worktree_basename(path, &n);
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opts.new_branch = xstrndup(s, n);
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}
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if (opts.new_branch) {
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struct child_process cp = CHILD_PROCESS_INIT;
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cp.git_cmd = 1;
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argv_array_push(&cp.args, "branch");
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if (opts.force_new_branch)
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argv_array_push(&cp.args, "--force");
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argv_array_push(&cp.args, opts.new_branch);
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argv_array_push(&cp.args, branch);
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if (run_command(&cp))
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return -1;
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branch = opts.new_branch;
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}
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UNLEAK(path);
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UNLEAK(opts);
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return add_worktree(path, branch, &opts);
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}
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static void show_worktree_porcelain(struct worktree *wt)
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{
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printf("worktree %s\n", wt->path);
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if (wt->is_bare)
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printf("bare\n");
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else {
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printf("HEAD %s\n", oid_to_hex(&wt->head_oid));
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if (wt->is_detached)
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printf("detached\n");
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else if (wt->head_ref)
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printf("branch %s\n", wt->head_ref);
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}
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printf("\n");
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}
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static void show_worktree(struct worktree *wt, int path_maxlen, int abbrev_len)
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{
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struct strbuf sb = STRBUF_INIT;
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int cur_path_len = strlen(wt->path);
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int path_adj = cur_path_len - utf8_strwidth(wt->path);
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strbuf_addf(&sb, "%-*s ", 1 + path_maxlen + path_adj, wt->path);
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if (wt->is_bare)
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strbuf_addstr(&sb, "(bare)");
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else {
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strbuf_addf(&sb, "%-*s ", abbrev_len,
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find_unique_abbrev(wt->head_oid.hash, DEFAULT_ABBREV));
|
|
if (wt->is_detached)
|
|
strbuf_addstr(&sb, "(detached HEAD)");
|
|
else if (wt->head_ref) {
|
|
char *ref = shorten_unambiguous_ref(wt->head_ref, 0);
|
|
strbuf_addf(&sb, "[%s]", ref);
|
|
free(ref);
|
|
} else
|
|
strbuf_addstr(&sb, "(error)");
|
|
}
|
|
printf("%s\n", sb.buf);
|
|
|
|
strbuf_release(&sb);
|
|
}
|
|
|
|
static void measure_widths(struct worktree **wt, int *abbrev, int *maxlen)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; wt[i]; i++) {
|
|
int sha1_len;
|
|
int path_len = strlen(wt[i]->path);
|
|
|
|
if (path_len > *maxlen)
|
|
*maxlen = path_len;
|
|
sha1_len = strlen(find_unique_abbrev(wt[i]->head_oid.hash, *abbrev));
|
|
if (sha1_len > *abbrev)
|
|
*abbrev = sha1_len;
|
|
}
|
|
}
|
|
|
|
static int list(int ac, const char **av, const char *prefix)
|
|
{
|
|
int porcelain = 0;
|
|
|
|
struct option options[] = {
|
|
OPT_BOOL(0, "porcelain", &porcelain, N_("machine-readable output")),
|
|
OPT_END()
|
|
};
|
|
|
|
ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
|
|
if (ac)
|
|
usage_with_options(worktree_usage, options);
|
|
else {
|
|
struct worktree **worktrees = get_worktrees(GWT_SORT_LINKED);
|
|
int path_maxlen = 0, abbrev = DEFAULT_ABBREV, i;
|
|
|
|
if (!porcelain)
|
|
measure_widths(worktrees, &abbrev, &path_maxlen);
|
|
|
|
for (i = 0; worktrees[i]; i++) {
|
|
if (porcelain)
|
|
show_worktree_porcelain(worktrees[i]);
|
|
else
|
|
show_worktree(worktrees[i], path_maxlen, abbrev);
|
|
}
|
|
free_worktrees(worktrees);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int lock_worktree(int ac, const char **av, const char *prefix)
|
|
{
|
|
const char *reason = "", *old_reason;
|
|
struct option options[] = {
|
|
OPT_STRING(0, "reason", &reason, N_("string"),
|
|
N_("reason for locking")),
|
|
OPT_END()
|
|
};
|
|
struct worktree **worktrees, *wt;
|
|
|
|
ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
|
|
if (ac != 1)
|
|
usage_with_options(worktree_usage, options);
|
|
|
|
worktrees = get_worktrees(0);
|
|
wt = find_worktree(worktrees, prefix, av[0]);
|
|
if (!wt)
|
|
die(_("'%s' is not a working tree"), av[0]);
|
|
if (is_main_worktree(wt))
|
|
die(_("The main working tree cannot be locked or unlocked"));
|
|
|
|
old_reason = is_worktree_locked(wt);
|
|
if (old_reason) {
|
|
if (*old_reason)
|
|
die(_("'%s' is already locked, reason: %s"),
|
|
av[0], old_reason);
|
|
die(_("'%s' is already locked"), av[0]);
|
|
}
|
|
|
|
write_file(git_common_path("worktrees/%s/locked", wt->id),
|
|
"%s", reason);
|
|
free_worktrees(worktrees);
|
|
return 0;
|
|
}
|
|
|
|
static int unlock_worktree(int ac, const char **av, const char *prefix)
|
|
{
|
|
struct option options[] = {
|
|
OPT_END()
|
|
};
|
|
struct worktree **worktrees, *wt;
|
|
int ret;
|
|
|
|
ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
|
|
if (ac != 1)
|
|
usage_with_options(worktree_usage, options);
|
|
|
|
worktrees = get_worktrees(0);
|
|
wt = find_worktree(worktrees, prefix, av[0]);
|
|
if (!wt)
|
|
die(_("'%s' is not a working tree"), av[0]);
|
|
if (is_main_worktree(wt))
|
|
die(_("The main working tree cannot be locked or unlocked"));
|
|
if (!is_worktree_locked(wt))
|
|
die(_("'%s' is not locked"), av[0]);
|
|
ret = unlink_or_warn(git_common_path("worktrees/%s/locked", wt->id));
|
|
free_worktrees(worktrees);
|
|
return ret;
|
|
}
|
|
|
|
int cmd_worktree(int ac, const char **av, const char *prefix)
|
|
{
|
|
struct option options[] = {
|
|
OPT_END()
|
|
};
|
|
|
|
git_config(git_default_config, NULL);
|
|
|
|
if (ac < 2)
|
|
usage_with_options(worktree_usage, options);
|
|
if (!prefix)
|
|
prefix = "";
|
|
if (!strcmp(av[1], "add"))
|
|
return add(ac - 1, av + 1, prefix);
|
|
if (!strcmp(av[1], "prune"))
|
|
return prune(ac - 1, av + 1, prefix);
|
|
if (!strcmp(av[1], "list"))
|
|
return list(ac - 1, av + 1, prefix);
|
|
if (!strcmp(av[1], "lock"))
|
|
return lock_worktree(ac - 1, av + 1, prefix);
|
|
if (!strcmp(av[1], "unlock"))
|
|
return unlock_worktree(ac - 1, av + 1, prefix);
|
|
usage_with_options(worktree_usage, options);
|
|
}
|