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prune: strategies for linked checkouts

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(alias R=$GIT_COMMON_DIR/worktrees/<id>)

 - linked checkouts are supposed to keep its location in $R/gitdir up
   to date. The use case is auto fixup after a manual checkout move.

 - linked checkouts are supposed to update mtime of $R/gitdir. If
   $R/gitdir's mtime is older than a limit, and it points to nowhere,
   worktrees/<id> is to be pruned.

 - If $R/locked exists, worktrees/<id> is not supposed to be pruned. If
   $R/locked exists and $R/gitdir's mtime is older than a really long
   limit, warn about old unused repo.

 - "git checkout --to" is supposed to make a hard link named $R/link
   pointing to the .git file on supported file systems to help detect
   the user manually deleting the checkout. If $R/link exists and its
   link count is greated than 1, the repo is kept.

Helped-by: Marc Branchaud <marcnarc@xiplink.com>
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Helped-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Marc Branchaud <marcnarc@xiplink.com>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy 2014-11-30 15:24:48 +07:00 committed by Junio C Hamano
parent 529fef20cf
commit 23af91d102
7 changed files with 251 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
Documentation/git-checkout.txt
View File

@ -434,6 +434,26 @@ thumb is do not make any assumption about whether a path belongs to
$GIT_DIR or $GIT_COMMON_DIR when you need to directly access something
inside $GIT_DIR. Use `git rev-parse --git-path` to get the final path.
When you are done with a linked working tree you can simply delete it.
You can clean up any stale $GIT_DIR/worktrees entries via `git prune
--worktrees` in the main or any linked working tree.
If you move a linked working directory to another file system, or
within a file system that does not support hard links, you need to run
at least one git command inside the linked working directory
(e.g. `git status`) in order to update its entry in $GIT_DIR/worktrees
so that it does not get automatically removed.
To prevent `git prune --worktrees` from deleting a $GIT_DIR/worktrees
entry (which can be useful in some situations, such as when the
entry's working tree is stored on a portable device), add a file named
'locked' to the entry's directory. The file contains the reason in
plain text. For example, if a linked working tree's `.git` file points
to `/path/main/.git/worktrees/test-next` then a file named
`/path/main/.git/worktrees/test-next/locked` will prevent the
`test-next` entry from being pruned. See
linkgit:gitrepository-layout[5] for details.
EXAMPLES
--------

3
Documentation/git-prune.txt
View File

@ -48,6 +48,9 @@ OPTIONS
--expire <time>::
Only expire loose objects older than <time>.
--worktrees::
Prune dead working tree information in $GIT_DIR/worktrees.
<head>...::
In addition to objects
reachable from any of our references, keep objects

19
Documentation/gitrepository-layout.txt
View File

@ -259,6 +259,25 @@ worktrees::
$GIT_COMMON_DIR is set and "$GIT_COMMON_DIR/worktrees" will be
used instead.
worktrees/<id>/gitdir::
A text file containing the absolute path back to the .git file
that points to here. This is used to check if the linked
repository has been manually removed and there is no need to
keep this directory any more. mtime of this file should be
updated every time the linked repository is accessed.
worktrees/<id>/locked::
If this file exists, the linked repository may be on a
portable device and not available. It does not mean that the
linked repository is gone and `worktrees/<id>` could be
removed. The file's content contains a reason string on why
the repository is locked.
worktrees/<id>/link::
If this file exists, it is a hard link to the linked .git
file. It is used to detect if the linked repository is
manually removed.
SEE ALSO
--------
linkgit:git-init[1],

19
builtin/checkout.c
View File

@ -826,7 +826,7 @@ static int prepare_linked_checkout(const struct checkout_opts *opts,
const char *path = opts->new_worktree, *name;
struct stat st;
struct child_process cp;
int counter = 0, len;
int counter = 0, len, ret;
if (!new->commit)
die(_("no branch specified"));
@ -857,11 +857,21 @@ static int prepare_linked_checkout(const struct checkout_opts *opts,
if (mkdir(sb_repo.buf, 0777))
die_errno(_("could not create directory of '%s'"), sb_repo.buf);
/*
* lock the incomplete repo so prune won't delete it, unlock
* after the preparation is over.
*/
strbuf_addf(&sb, "%s/locked", sb_repo.buf);
write_file(sb.buf, 1, "initializing\n");
strbuf_addf(&sb_git, "%s/.git", path);
if (safe_create_leading_directories_const(sb_git.buf))
die_errno(_("could not create leading directories of '%s'"),
sb_git.buf);
strbuf_reset(&sb);
strbuf_addf(&sb, "%s/gitdir", sb_repo.buf);
write_file(sb.buf, 1, "%s\n", real_path(sb_git.buf));
write_file(sb_git.buf, 1, "gitdir: %s/worktrees/%s\n",
real_path(get_git_common_dir()), name);
/*
@ -870,6 +880,7 @@ static int prepare_linked_checkout(const struct checkout_opts *opts,
* value would do because this value will be ignored and
* replaced at the next (real) checkout.
*/
strbuf_reset(&sb);
strbuf_addf(&sb, "%s/HEAD", sb_repo.buf);
write_file(sb.buf, 1, "%s\n", sha1_to_hex(new->commit->object.sha1));
strbuf_reset(&sb);
@ -885,7 +896,11 @@ static int prepare_linked_checkout(const struct checkout_opts *opts,
memset(&cp, 0, sizeof(cp));
cp.git_cmd = 1;
cp.argv = opts->saved_argv;
return run_command(&cp);
ret = run_command(&cp);
strbuf_reset(&sb);
strbuf_addf(&sb, "%s/locked", sb_repo.buf);
unlink_or_warn(sb.buf);
return ret;
}
static int git_checkout_config(const char *var, const char *value, void *cb)

95
builtin/prune.c
View File

@ -76,6 +76,91 @@ static int prune_subdir(int nr, const char *path, void *data)
return 0;
}
static int prune_worktree(const char *id, struct strbuf *reason)
{
struct stat st;
char *path;
int fd, len;
if (!is_directory(git_path("worktrees/%s", id))) {
strbuf_addf(reason, _("Removing worktrees/%s: not a valid directory"), id);
return 1;
}
if (file_exists(git_path("worktrees/%s/locked", id)))
return 0;
if (stat(git_path("worktrees/%s/gitdir", id), &st)) {
strbuf_addf(reason, _("Removing worktrees/%s: gitdir file does not exist"), id);
return 1;
}
fd = open(git_path("worktrees/%s/gitdir", id), O_RDONLY);
if (fd < 0) {
strbuf_addf(reason, _("Removing worktrees/%s: unable to read gitdir file (%s)"),
id, strerror(errno));
return 1;
}
len = st.st_size;
path = xmalloc(len + 1);
read_in_full(fd, path, len);
close(fd);
while (len && (path[len - 1] == '\n' || path[len - 1] == '\r'))
len--;
if (!len) {
strbuf_addf(reason, _("Removing worktrees/%s: invalid gitdir file"), id);
free(path);
return 1;
}
path[len] = '\0';
if (!file_exists(path)) {
struct stat st_link;
free(path);
/*
* the repo is moved manually and has not been
* accessed since?
*/
if (!stat(git_path("worktrees/%s/link", id), &st_link) &&
st_link.st_nlink > 1)
return 0;
strbuf_addf(reason, _("Removing worktrees/%s: gitdir file points to non-existent location"), id);
return 1;
}
free(path);
return st.st_mtime <= expire;
}
static void prune_worktrees(void)
{
struct strbuf reason = STRBUF_INIT;
struct strbuf path = STRBUF_INIT;
DIR *dir = opendir(git_path("worktrees"));
struct dirent *d;
int ret;
if (!dir)
return;
while ((d = readdir(dir)) != NULL) {
if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
continue;
strbuf_reset(&reason);
if (!prune_worktree(d->d_name, &reason))
continue;
if (show_only || verbose)
printf("%s\n", reason.buf);
if (show_only)
continue;
strbuf_reset(&path);
strbuf_addstr(&path, git_path("worktrees/%s", d->d_name));
ret = remove_dir_recursively(&path, 0);
if (ret < 0 && errno == ENOTDIR)
ret = unlink(path.buf);
if (ret)
error(_("failed to remove: %s"), strerror(errno));
}
closedir(dir);
if (!show_only)
rmdir(git_path("worktrees"));
strbuf_release(&reason);
strbuf_release(&path);
}
/*
* Write errors (particularly out of space) can result in
* failed temporary packs (and more rarely indexes and other
@ -102,10 +187,12 @@ int cmd_prune(int argc, const char **argv, const char *prefix)
{
struct rev_info revs;
struct progress *progress = NULL;
int do_prune_worktrees = 0;
const struct option options[] = {
OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
OPT__VERBOSE(&verbose, N_("report pruned objects")),
OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
OPT_BOOL(0, "worktrees", &do_prune_worktrees, N_("prune .git/worktrees")),
OPT_EXPIRY_DATE(0, "expire", &expire,
N_("expire objects older than <time>")),
OPT_END()
@ -118,6 +205,14 @@ int cmd_prune(int argc, const char **argv, const char *prefix)
init_revisions(&revs, prefix);
argc = parse_options(argc, argv, prefix, options, prune_usage, 0);
if (do_prune_worktrees) {
if (argc)
die(_("--worktrees does not take extra arguments"));
prune_worktrees();
return 0;
}
while (argc--) {
unsigned char sha1[20];
const char *name = *argv++;

13
setup.c
View File

@ -390,6 +390,17 @@ static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
return ret;
}
static void update_linked_gitdir(const char *gitfile, const char *gitdir)
{
struct strbuf path = STRBUF_INIT;
struct stat st;
strbuf_addf(&path, "%s/gitfile", gitdir);
if (stat(path.buf, &st) || st.st_mtime + 24 * 3600 < time(NULL))
write_file(path.buf, 0, "%s\n", gitfile);
strbuf_release(&path);
}
/*
* Try to read the location of the git directory from the .git file,
* return path to git directory if found.
@ -438,6 +449,8 @@ const char *read_gitfile(const char *path)
if (!is_git_directory(dir))
die("Not a git repository: %s", dir);
update_linked_gitdir(path, dir);
path = real_path(dir);
free(buf);

84
t/t2026-prune-linked-checkouts.sh Executable file
View File

@ -0,0 +1,84 @@
#!/bin/sh
test_description='prune $GIT_DIR/worktrees'
. ./test-lib.sh
test_expect_success 'prune --worktrees on normal repo' '
git prune --worktrees &&
test_must_fail git prune --worktrees abc
'
test_expect_success 'prune files inside $GIT_DIR/worktrees' '
mkdir .git/worktrees &&
: >.git/worktrees/abc &&
git prune --worktrees --verbose >actual &&
cat >expect <<EOF &&
Removing worktrees/abc: not a valid directory
EOF
test_i18ncmp expect actual &&
! test -f .git/worktrees/abc &&
! test -d .git/worktrees
'
test_expect_success 'prune directories without gitdir' '
mkdir -p .git/worktrees/def/abc &&
: >.git/worktrees/def/def &&
cat >expect <<EOF &&
Removing worktrees/def: gitdir file does not exist
EOF
git prune --worktrees --verbose >actual &&
test_i18ncmp expect actual &&
! test -d .git/worktrees/def &&
! test -d .git/worktrees
'
test_expect_success POSIXPERM 'prune directories with unreadable gitdir' '
mkdir -p .git/worktrees/def/abc &&
: >.git/worktrees/def/def &&
: >.git/worktrees/def/gitdir &&
chmod u-r .git/worktrees/def/gitdir &&
git prune --worktrees --verbose >actual &&
test_i18ngrep "Removing worktrees/def: unable to read gitdir file" actual &&
! test -d .git/worktrees/def &&
! test -d .git/worktrees
'
test_expect_success 'prune directories with invalid gitdir' '
mkdir -p .git/worktrees/def/abc &&
: >.git/worktrees/def/def &&
: >.git/worktrees/def/gitdir &&
git prune --worktrees --verbose >actual &&
test_i18ngrep "Removing worktrees/def: invalid gitdir file" actual &&
! test -d .git/worktrees/def &&
! test -d .git/worktrees
'
test_expect_success 'prune directories with gitdir pointing to nowhere' '
mkdir -p .git/worktrees/def/abc &&
: >.git/worktrees/def/def &&
echo "$(pwd)"/nowhere >.git/worktrees/def/gitdir &&
git prune --worktrees --verbose >actual &&
test_i18ngrep "Removing worktrees/def: gitdir file points to non-existent location" actual &&
! test -d .git/worktrees/def &&
! test -d .git/worktrees
'
test_expect_success 'not prune locked checkout' '
test_when_finished rm -r .git/worktrees
mkdir -p .git/worktrees/ghi &&
: >.git/worktrees/ghi/locked &&
git prune --worktrees &&
test -d .git/worktrees/ghi
'
test_expect_success 'not prune recent checkouts' '
test_when_finished rm -r .git/worktrees
mkdir zz &&
mkdir -p .git/worktrees/jlm &&
echo "$(pwd)"/zz >.git/worktrees/jlm/gitdir &&
git prune --worktrees --verbose --expire=2.days.ago &&
test -d .git/worktrees/jlm
'
test_done