[PATCH v6 27/32] prune: strategies for linked checkouts
(alias R=$GIT_COMMON_DIR/repos/<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,
repos/<id> is to be pruned.
- If $R/locked exists, repos/<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.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
Documentation/git-prune.txt | 3 ++
Documentation/gitrepository-layout.txt | 19 +++++++++
builtin/checkout.c | 14 +++++++
builtin/prune.c | 74 ++++++++++++++++++++++++++++++++++
setup.c | 13 ++++++
5 files changed, 123 insertions(+)
diff --git a/Documentation/git-prune.txt b/Documentation/git-prune.txt
index 7a493c8..50e39ec 100644
--- a/Documentation/git-prune.txt
+++ b/Documentation/git-prune.txt
@@ -48,6 +48,9 @@ OPTIONS
--expire <time>::
Only expire loose objects older than <time>.
+--repos::
+ Prune directories in $GIT_DIR/repos.
+
<head>...::
In addition to objects
reachable from any of our references, keep objects
diff --git a/Documentation/gitrepository-layout.txt b/Documentation/gitrepository-layout.txt
index 543d874..bed4f1a 100644
--- a/Documentation/gitrepository-layout.txt
+++ b/Documentation/gitrepository-layout.txt
@@ -256,6 +256,25 @@ repos::
$GIT_COMMON_DIR is set and "$GIT_COMMON_DIR/repos" will be
used instead.
+repos/<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.
+
+repos/<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 `repos/<id>` could be
+ removed. The file's content contains a reason string on why
+ the repository is locked.
+
+repos/<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],
diff --git a/builtin/checkout.c b/builtin/checkout.c
index 069e803..98a2f5f 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -898,12 +898,22 @@ static int prepare_linked_checkout(const struct checkout_opts *opts,
junk_git_dir = sb_repo.buf;
is_junk = 1;
+ /*
+ * 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);
junk_work_tree = path;
+ 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/repos/%s\n",
real_path(get_git_common_dir()), name);
/*
@@ -912,6 +922,7 @@ 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);
@@ -930,6 +941,9 @@ static int prepare_linked_checkout(const struct checkout_opts *opts,
ret = run_command(&cp);
if (!ret)
is_junk = 0;
+ strbuf_reset(&sb);
+ strbuf_addf(&sb, "%s/locked", sb_repo.buf);
+ unlink_or_warn(sb.buf);
strbuf_release(&sb);
strbuf_release(&sb_repo);
strbuf_release(&sb_git);
diff --git a/builtin/prune.c b/builtin/prune.c
index 144a3bd..6db6bcc 100644
--- a/builtin/prune.c
+++ b/builtin/prune.c
@@ -112,6 +112,70 @@ static void prune_object_dir(const char *path)
}
}
+static const char *prune_repo_dir(const char *id, struct stat *st)
+{
+ char *path;
+ int fd, len;
+ if (file_exists(git_path("repos/%s/locked", id)))
+ return NULL;
+ if (stat(git_path("repos/%s/gitdir", id), st)) {
+ st->st_mtime = expire;
+ return _("gitdir does not exist");
+ }
+ fd = open(git_path("repos/%s/gitdir", id), O_RDONLY);
+ len = st->st_size;
+ path = xmalloc(len + 1);
+ read_in_full(fd, path, len);
+ close(fd);
+ while (path[len - 1] == '\n' || path[len - 1] == '\r')
+ len--;
+ 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("repos/%s/link", id), &st_link) &&
+ st_link.st_nlink > 1)
+ return NULL;
+ return _("gitdir points to non-existing file");
+ }
+ free(path);
+ return NULL;
+}
+
+static void prune_repos_dir(void)
+{
+ const char *reason;
+ DIR *dir = opendir(git_path("repos"));
+ struct dirent *d;
+ int removed = 0;
+ struct stat st;
+ if (!dir)
+ return;
+ while ((d = readdir(dir)) != NULL) {
+ if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
+ continue;
+ if ((reason = prune_repo_dir(d->d_name, &st)) != NULL &&
+ st.st_mtime <= expire) {
+ struct strbuf sb = STRBUF_INIT;
+ if (show_only || verbose)
+ printf(_("Removing repos/%s: %s\n"), d->d_name, reason);
+ if (show_only)
+ continue;
+ strbuf_addstr(&sb, git_path("repos/%s", d->d_name));
+ remove_dir_recursively(&sb, 0);
+ strbuf_release(&sb);
+ removed = 1;
+ }
+ }
+ closedir(dir);
+ if (removed)
+ rmdir(git_path("repos"));
+}
+
/*
* Write errors (particularly out of space) can result in
* failed temporary packs (and more rarely indexes and other
@@ -138,10 +202,12 @@ int cmd_prune(int argc, const char **argv, const char *prefix)
{
struct rev_info revs;
struct progress *progress = NULL;
+ int prune_repos = 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, "repos", &prune_repos, N_("prune .git/repos/")),
OPT_EXPIRY_DATE(0, "expire", &expire,
N_("expire objects older than <time>")),
OPT_END()
@@ -154,6 +220,14 @@ 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 (prune_repos) {
+ if (argc)
+ die(_("--repos does not take extra arguments"));
+ prune_repos_dir();
+ return 0;
+ }
+
while (argc--) {
unsigned char sha1[20];
const char *name = *argv++;
diff --git a/setup.c b/setup.c
index 8f90bc3..da2d669 100644
--- a/setup.c
+++ b/setup.c
@@ -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);
--
1.9.1.346.ga2b5940
Nguyễn Thái Ngọc Duy <pclouds@gmail.com>