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Diffstat (limited to 'builtin/fetch.c')
-rw-r--r--builtin/fetch.c224
1 files changed, 167 insertions, 57 deletions
diff --git a/builtin/fetch.c b/builtin/fetch.c
index 837382ef4f..0b90de87c7 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -63,6 +63,7 @@ static int enable_auto_gc = 1;
static int tags = TAGS_DEFAULT, unshallow, update_shallow, deepen;
static int max_jobs = -1, submodule_fetch_jobs_config = -1;
static int fetch_parallel_config = 1;
+static int atomic_fetch;
static enum transport_family family;
static const char *depth;
static const char *deepen_since;
@@ -144,6 +145,8 @@ static struct option builtin_fetch_options[] = {
N_("set upstream for git pull/fetch")),
OPT_BOOL('a', "append", &append,
N_("append to .git/FETCH_HEAD instead of overwriting")),
+ OPT_BOOL(0, "atomic", &atomic_fetch,
+ N_("use atomic transaction to update references")),
OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
N_("path to upload pack on remote end")),
OPT__FORCE(&force, N_("force overwrite of local reference"), 0),
@@ -583,13 +586,14 @@ static struct ref *get_ref_map(struct remote *remote,
static int s_update_ref(const char *action,
struct ref *ref,
+ struct ref_transaction *transaction,
int check_old)
{
char *msg;
char *rla = getenv("GIT_REFLOG_ACTION");
- struct ref_transaction *transaction;
+ struct ref_transaction *our_transaction = NULL;
struct strbuf err = STRBUF_INIT;
- int ret, df_conflict = 0;
+ int ret;
if (dry_run)
return 0;
@@ -597,31 +601,47 @@ static int s_update_ref(const char *action,
rla = default_rla.buf;
msg = xstrfmt("%s: %s", rla, action);
- transaction = ref_transaction_begin(&err);
- if (!transaction ||
- ref_transaction_update(transaction, ref->name,
- &ref->new_oid,
- check_old ? &ref->old_oid : NULL,
- 0, msg, &err))
- goto fail;
+ /*
+ * If no transaction was passed to us, we manage the transaction
+ * ourselves. Otherwise, we trust the caller to handle the transaction
+ * lifecycle.
+ */
+ if (!transaction) {
+ transaction = our_transaction = ref_transaction_begin(&err);
+ if (!transaction) {
+ ret = STORE_REF_ERROR_OTHER;
+ goto out;
+ }
+ }
- ret = ref_transaction_commit(transaction, &err);
+ ret = ref_transaction_update(transaction, ref->name, &ref->new_oid,
+ check_old ? &ref->old_oid : NULL,
+ 0, msg, &err);
if (ret) {
- df_conflict = (ret == TRANSACTION_NAME_CONFLICT);
- goto fail;
+ ret = STORE_REF_ERROR_OTHER;
+ goto out;
}
- ref_transaction_free(transaction);
- strbuf_release(&err);
- free(msg);
- return 0;
-fail:
- ref_transaction_free(transaction);
- error("%s", err.buf);
+ if (our_transaction) {
+ switch (ref_transaction_commit(our_transaction, &err)) {
+ case 0:
+ break;
+ case TRANSACTION_NAME_CONFLICT:
+ ret = STORE_REF_ERROR_DF_CONFLICT;
+ goto out;
+ default:
+ ret = STORE_REF_ERROR_OTHER;
+ goto out;
+ }
+ }
+
+out:
+ ref_transaction_free(our_transaction);
+ if (ret)
+ error("%s", err.buf);
strbuf_release(&err);
free(msg);
- return df_conflict ? STORE_REF_ERROR_DF_CONFLICT
- : STORE_REF_ERROR_OTHER;
+ return ret;
}
static int refcol_width = 10;
@@ -759,6 +779,7 @@ static void format_display(struct strbuf *display, char code,
}
static int update_local_ref(struct ref *ref,
+ struct ref_transaction *transaction,
const char *remote,
const struct ref *remote_ref,
struct strbuf *display,
@@ -799,7 +820,7 @@ static int update_local_ref(struct ref *ref,
starts_with(ref->name, "refs/tags/")) {
if (force || ref->force) {
int r;
- r = s_update_ref("updating tag", ref, 0);
+ r = s_update_ref("updating tag", ref, transaction, 0);
format_display(display, r ? '!' : 't', _("[tag update]"),
r ? _("unable to update local ref") : NULL,
remote, pretty_ref, summary_width);
@@ -836,7 +857,7 @@ static int update_local_ref(struct ref *ref,
what = _("[new ref]");
}
- r = s_update_ref(msg, ref, 0);
+ r = s_update_ref(msg, ref, transaction, 0);
format_display(display, r ? '!' : '*', what,
r ? _("unable to update local ref") : NULL,
remote, pretty_ref, summary_width);
@@ -858,7 +879,7 @@ static int update_local_ref(struct ref *ref,
strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
strbuf_addstr(&quickref, "..");
strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
- r = s_update_ref("fast-forward", ref, 1);
+ r = s_update_ref("fast-forward", ref, transaction, 1);
format_display(display, r ? '!' : ' ', quickref.buf,
r ? _("unable to update local ref") : NULL,
remote, pretty_ref, summary_width);
@@ -870,7 +891,7 @@ static int update_local_ref(struct ref *ref,
strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
strbuf_addstr(&quickref, "...");
strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
- r = s_update_ref("forced-update", ref, 1);
+ r = s_update_ref("forced-update", ref, transaction, 1);
format_display(display, r ? '!' : '+', quickref.buf,
r ? _("unable to update local ref") : _("forced update"),
remote, pretty_ref, summary_width);
@@ -897,6 +918,89 @@ static int iterate_ref_map(void *cb_data, struct object_id *oid)
return 0;
}
+struct fetch_head {
+ FILE *fp;
+ struct strbuf buf;
+};
+
+static int open_fetch_head(struct fetch_head *fetch_head)
+{
+ const char *filename = git_path_fetch_head(the_repository);
+
+ if (write_fetch_head) {
+ fetch_head->fp = fopen(filename, "a");
+ if (!fetch_head->fp)
+ return error_errno(_("cannot open %s"), filename);
+ strbuf_init(&fetch_head->buf, 0);
+ } else {
+ fetch_head->fp = NULL;
+ }
+
+ return 0;
+}
+
+static void append_fetch_head(struct fetch_head *fetch_head,
+ const struct object_id *old_oid,
+ enum fetch_head_status fetch_head_status,
+ const char *note,
+ const char *url, size_t url_len)
+{
+ char old_oid_hex[GIT_MAX_HEXSZ + 1];
+ const char *merge_status_marker;
+ size_t i;
+
+ if (!fetch_head->fp)
+ return;
+
+ switch (fetch_head_status) {
+ case FETCH_HEAD_NOT_FOR_MERGE:
+ merge_status_marker = "not-for-merge";
+ break;
+ case FETCH_HEAD_MERGE:
+ merge_status_marker = "";
+ break;
+ default:
+ /* do not write anything to FETCH_HEAD */
+ return;
+ }
+
+ strbuf_addf(&fetch_head->buf, "%s\t%s\t%s",
+ oid_to_hex_r(old_oid_hex, old_oid), merge_status_marker, note);
+ for (i = 0; i < url_len; ++i)
+ if ('\n' == url[i])
+ strbuf_addstr(&fetch_head->buf, "\\n");
+ else
+ strbuf_addch(&fetch_head->buf, url[i]);
+ strbuf_addch(&fetch_head->buf, '\n');
+
+ /*
+ * When using an atomic fetch, we do not want to update FETCH_HEAD if
+ * any of the reference updates fails. We thus have to write all
+ * updates to a buffer first and only commit it as soon as all
+ * references have been successfully updated.
+ */
+ if (!atomic_fetch) {
+ strbuf_write(&fetch_head->buf, fetch_head->fp);
+ strbuf_reset(&fetch_head->buf);
+ }
+}
+
+static void commit_fetch_head(struct fetch_head *fetch_head)
+{
+ if (!fetch_head->fp || !atomic_fetch)
+ return;
+ strbuf_write(&fetch_head->buf, fetch_head->fp);
+}
+
+static void close_fetch_head(struct fetch_head *fetch_head)
+{
+ if (!fetch_head->fp)
+ return;
+
+ fclose(fetch_head->fp);
+ strbuf_release(&fetch_head->buf);
+}
+
static const char warn_show_forced_updates[] =
N_("Fetch normally indicates which branches had a forced update,\n"
"but that check has been disabled. To re-enable, use '--show-forced-updates'\n"
@@ -909,22 +1013,20 @@ N_("It took %.2f seconds to check forced updates. You can use\n"
static int store_updated_refs(const char *raw_url, const char *remote_name,
int connectivity_checked, struct ref *ref_map)
{
- FILE *fp;
+ struct fetch_head fetch_head;
struct commit *commit;
int url_len, i, rc = 0;
- struct strbuf note = STRBUF_INIT;
+ struct strbuf note = STRBUF_INIT, err = STRBUF_INIT;
+ struct ref_transaction *transaction = NULL;
const char *what, *kind;
struct ref *rm;
char *url;
- const char *filename = (!write_fetch_head
- ? "/dev/null"
- : git_path_fetch_head(the_repository));
int want_status;
int summary_width = transport_summary_width(ref_map);
- fp = fopen(filename, "a");
- if (!fp)
- return error_errno(_("cannot open %s"), filename);
+ rc = open_fetch_head(&fetch_head);
+ if (rc)
+ return -1;
if (raw_url)
url = transport_anonymize_url(raw_url);
@@ -941,6 +1043,14 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
}
}
+ if (atomic_fetch) {
+ transaction = ref_transaction_begin(&err);
+ if (!transaction) {
+ error("%s", err.buf);
+ goto abort;
+ }
+ }
+
prepare_format_display(ref_map);
/*
@@ -953,7 +1063,6 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
want_status++) {
for (rm = ref_map; rm; rm = rm->next) {
struct ref *ref = NULL;
- const char *merge_status_marker = "";
if (rm->status == REF_STATUS_REJECT_SHALLOW) {
if (want_status == FETCH_HEAD_MERGE)
@@ -1011,31 +1120,15 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
strbuf_addf(&note, "%s ", kind);
strbuf_addf(&note, "'%s' of ", what);
}
- switch (rm->fetch_head_status) {
- case FETCH_HEAD_NOT_FOR_MERGE:
- merge_status_marker = "not-for-merge";
- /* fall-through */
- case FETCH_HEAD_MERGE:
- fprintf(fp, "%s\t%s\t%s",
- oid_to_hex(&rm->old_oid),
- merge_status_marker,
- note.buf);
- for (i = 0; i < url_len; ++i)
- if ('\n' == url[i])
- fputs("\\n", fp);
- else
- fputc(url[i], fp);
- fputc('\n', fp);
- break;
- default:
- /* do not write anything to FETCH_HEAD */
- break;
- }
+
+ append_fetch_head(&fetch_head, &rm->old_oid,
+ rm->fetch_head_status,
+ note.buf, url, url_len);
strbuf_reset(&note);
if (ref) {
- rc |= update_local_ref(ref, what, rm, &note,
- summary_width);
+ rc |= update_local_ref(ref, transaction, what,
+ rm, &note, summary_width);
free(ref);
} else if (write_fetch_head || dry_run) {
/*
@@ -1060,6 +1153,17 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
}
}
+ if (!rc && transaction) {
+ rc = ref_transaction_commit(transaction, &err);
+ if (rc) {
+ error("%s", err.buf);
+ goto abort;
+ }
+ }
+
+ if (!rc)
+ commit_fetch_head(&fetch_head);
+
if (rc & STORE_REF_ERROR_DF_CONFLICT)
error(_("some local refs could not be updated; try running\n"
" 'git remote prune %s' to remove any old, conflicting "
@@ -1076,8 +1180,10 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
abort:
strbuf_release(&note);
+ strbuf_release(&err);
+ ref_transaction_free(transaction);
free(url);
- fclose(fp);
+ close_fetch_head(&fetch_head);
return rc;
}
@@ -1891,6 +1997,10 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
die(_("--filter can only be used with the remote "
"configured in extensions.partialclone"));
+ if (atomic_fetch)
+ die(_("--atomic can only be used when fetching "
+ "from one remote"));
+
if (stdin_refspecs)
die(_("--stdin can only be used when fetching "
"from one remote"));
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-23 10:58:29 +0000