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git-commit-vandalism/builtin/fetch.c
Junio C Hamano 0f5e885173 Merge branch 'rc/fetch-refetch' 
"git fetch --refetch" learned to fetch everything without telling
the other side what we already have, which is useful when you
cannot trust what you have in the local object store.

* rc/fetch-refetch:
  docs: mention --refetch fetch option
  fetch: after refetch, encourage auto gc repacking
  t5615-partial-clone: add test for fetch --refetch
  fetch: add --refetch option
  builtin/fetch-pack: add --refetch option
  fetch-pack: add refetch
  fetch-negotiator: add specific noop initializer
2022-04-04 10:56:23 -07:00

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/*
* "git fetch"
*/
#include "cache.h"
#include "config.h"
#include "repository.h"
#include "refs.h"
#include "refspec.h"
#include "object-store.h"
#include "oidset.h"
#include "commit.h"
#include "builtin.h"
#include "string-list.h"
#include "remote.h"
#include "transport.h"
#include "run-command.h"
#include "parse-options.h"
#include "sigchain.h"
#include "submodule-config.h"
#include "submodule.h"
#include "connected.h"
#include "strvec.h"
#include "utf8.h"
#include "packfile.h"
#include "list-objects-filter-options.h"
#include "commit-reach.h"
#include "branch.h"
#include "promisor-remote.h"
#include "commit-graph.h"
#include "shallow.h"
#include "worktree.h"
#define FORCED_UPDATES_DELAY_WARNING_IN_MS (10 * 1000)
static const char * const builtin_fetch_usage[] = {
N_("git fetch [<options>] [<repository> [<refspec>...]]"),
N_("git fetch [<options>] <group>"),
N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
N_("git fetch --all [<options>]"),
NULL
};
enum {
TAGS_UNSET = 0,
TAGS_DEFAULT = 1,
TAGS_SET = 2
};
static int fetch_prune_config = -1; /* unspecified */
static int fetch_show_forced_updates = 1;
static uint64_t forced_updates_ms = 0;
static int prefetch = 0;
static int prune = -1; /* unspecified */
#define PRUNE_BY_DEFAULT 0 /* do we prune by default? */
static int fetch_prune_tags_config = -1; /* unspecified */
static int prune_tags = -1; /* unspecified */
#define PRUNE_TAGS_BY_DEFAULT 0 /* do we prune tags by default? */
static int all, append, dry_run, force, keep, multiple, update_head_ok;
static int write_fetch_head = 1;
static int verbosity, deepen_relative, set_upstream, refetch;
static int progress = -1;
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;
static const char *upload_pack;
static struct string_list deepen_not = STRING_LIST_INIT_NODUP;
static struct strbuf default_rla = STRBUF_INIT;
static struct transport *gtransport;
static struct transport *gsecondary;
static const char *submodule_prefix = "";
static int recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
static int recurse_submodules_cli = RECURSE_SUBMODULES_DEFAULT;
static int recurse_submodules_default = RECURSE_SUBMODULES_ON_DEMAND;
static int shown_url = 0;
static struct refspec refmap = REFSPEC_INIT_FETCH;
static struct list_objects_filter_options filter_options;
static struct string_list server_options = STRING_LIST_INIT_DUP;
static struct string_list negotiation_tip = STRING_LIST_INIT_NODUP;
static int fetch_write_commit_graph = -1;
static int stdin_refspecs = 0;
static int negotiate_only;
static int git_fetch_config(const char *k, const char *v, void *cb)
{
if (!strcmp(k, "fetch.prune")) {
fetch_prune_config = git_config_bool(k, v);
return 0;
}
if (!strcmp(k, "fetch.prunetags")) {
fetch_prune_tags_config = git_config_bool(k, v);
return 0;
}
if (!strcmp(k, "fetch.showforcedupdates")) {
fetch_show_forced_updates = git_config_bool(k, v);
return 0;
}
if (!strcmp(k, "submodule.recurse")) {
int r = git_config_bool(k, v) ?
RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
recurse_submodules = r;
}
if (!strcmp(k, "submodule.fetchjobs")) {
submodule_fetch_jobs_config = parse_submodule_fetchjobs(k, v);
return 0;
} else if (!strcmp(k, "fetch.recursesubmodules")) {
recurse_submodules = parse_fetch_recurse_submodules_arg(k, v);
return 0;
}
if (!strcmp(k, "fetch.parallel")) {
fetch_parallel_config = git_config_int(k, v);
if (fetch_parallel_config < 0)
die(_("fetch.parallel cannot be negative"));
return 0;
}
return git_default_config(k, v, cb);
}
static int parse_refmap_arg(const struct option *opt, const char *arg, int unset)
{
BUG_ON_OPT_NEG(unset);
/*
* "git fetch --refmap='' origin foo"
* can be used to tell the command not to store anywhere
*/
refspec_append(&refmap, arg);
return 0;
}
static struct option builtin_fetch_options[] = {
OPT__VERBOSITY(&verbosity),
OPT_BOOL(0, "all", &all,
N_("fetch from all remotes")),
OPT_BOOL(0, "set-upstream", &set_upstream,
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),
OPT_BOOL('m', "multiple", &multiple,
N_("fetch from multiple remotes")),
OPT_SET_INT('t', "tags", &tags,
N_("fetch all tags and associated objects"), TAGS_SET),
OPT_SET_INT('n', NULL, &tags,
N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
OPT_INTEGER('j', "jobs", &max_jobs,
N_("number of submodules fetched in parallel")),
OPT_BOOL(0, "prefetch", &prefetch,
N_("modify the refspec to place all refs within refs/prefetch/")),
OPT_BOOL('p', "prune", &prune,
N_("prune remote-tracking branches no longer on remote")),
OPT_BOOL('P', "prune-tags", &prune_tags,
N_("prune local tags no longer on remote and clobber changed tags")),
OPT_CALLBACK_F(0, "recurse-submodules", &recurse_submodules_cli, N_("on-demand"),
N_("control recursive fetching of submodules"),
PARSE_OPT_OPTARG, option_fetch_parse_recurse_submodules),
OPT_BOOL(0, "dry-run", &dry_run,
N_("dry run")),
OPT_BOOL(0, "write-fetch-head", &write_fetch_head,
N_("write fetched references to the FETCH_HEAD file")),
OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
OPT_BOOL('u', "update-head-ok", &update_head_ok,
N_("allow updating of HEAD ref")),
OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
OPT_STRING(0, "depth", &depth, N_("depth"),
N_("deepen history of shallow clone")),
OPT_STRING(0, "shallow-since", &deepen_since, N_("time"),
N_("deepen history of shallow repository based on time")),
OPT_STRING_LIST(0, "shallow-exclude", &deepen_not, N_("revision"),
N_("deepen history of shallow clone, excluding rev")),
OPT_INTEGER(0, "deepen", &deepen_relative,
N_("deepen history of shallow clone")),
OPT_SET_INT_F(0, "unshallow", &unshallow,
N_("convert to a complete repository"),
1, PARSE_OPT_NONEG),
OPT_SET_INT_F(0, "refetch", &refetch,
N_("re-fetch without negotiating common commits"),
1, PARSE_OPT_NONEG),
{ OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
OPT_CALLBACK_F(0, "recurse-submodules-default",
&recurse_submodules_default, N_("on-demand"),
N_("default for recursive fetching of submodules "
"(lower priority than config files)"),
PARSE_OPT_HIDDEN, option_fetch_parse_recurse_submodules),
OPT_BOOL(0, "update-shallow", &update_shallow,
N_("accept refs that update .git/shallow")),
OPT_CALLBACK_F(0, "refmap", NULL, N_("refmap"),
N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg),
OPT_STRING_LIST('o', "server-option", &server_options, N_("server-specific"), N_("option to transmit")),
OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
TRANSPORT_FAMILY_IPV4),
OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
TRANSPORT_FAMILY_IPV6),
OPT_STRING_LIST(0, "negotiation-tip", &negotiation_tip, N_("revision"),
N_("report that we have only objects reachable from this object")),
OPT_BOOL(0, "negotiate-only", &negotiate_only,
N_("do not fetch a packfile; instead, print ancestors of negotiation tips")),
OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
OPT_BOOL(0, "auto-maintenance", &enable_auto_gc,
N_("run 'maintenance --auto' after fetching")),
OPT_BOOL(0, "auto-gc", &enable_auto_gc,
N_("run 'maintenance --auto' after fetching")),
OPT_BOOL(0, "show-forced-updates", &fetch_show_forced_updates,
N_("check for forced-updates on all updated branches")),
OPT_BOOL(0, "write-commit-graph", &fetch_write_commit_graph,
N_("write the commit-graph after fetching")),
OPT_BOOL(0, "stdin", &stdin_refspecs,
N_("accept refspecs from stdin")),
OPT_END()
};
static void unlock_pack(unsigned int flags)
{
if (gtransport)
transport_unlock_pack(gtransport, flags);
if (gsecondary)
transport_unlock_pack(gsecondary, flags);
}
static void unlock_pack_atexit(void)
{
unlock_pack(0);
}
static void unlock_pack_on_signal(int signo)
{
unlock_pack(TRANSPORT_UNLOCK_PACK_IN_SIGNAL_HANDLER);
sigchain_pop(signo);
raise(signo);
}
static void add_merge_config(struct ref **head,
const struct ref *remote_refs,
struct branch *branch,
struct ref ***tail)
{
int i;
for (i = 0; i < branch->merge_nr; i++) {
struct ref *rm, **old_tail = *tail;
struct refspec_item refspec;
for (rm = *head; rm; rm = rm->next) {
if (branch_merge_matches(branch, i, rm->name)) {
rm->fetch_head_status = FETCH_HEAD_MERGE;
break;
}
}
if (rm)
continue;
/*
* Not fetched to a remote-tracking branch? We need to fetch
* it anyway to allow this branch's "branch.$name.merge"
* to be honored by 'git pull', but we do not have to
* fail if branch.$name.merge is misconfigured to point
* at a nonexisting branch. If we were indeed called by
* 'git pull', it will notice the misconfiguration because
* there is no entry in the resulting FETCH_HEAD marked
* for merging.
*/
memset(&refspec, 0, sizeof(refspec));
refspec.src = branch->merge[i]->src;
get_fetch_map(remote_refs, &refspec, tail, 1);
for (rm = *old_tail; rm; rm = rm->next)
rm->fetch_head_status = FETCH_HEAD_MERGE;
}
}
static void create_fetch_oidset(struct ref **head, struct oidset *out)
{
struct ref *rm = *head;
while (rm) {
oidset_insert(out, &rm->old_oid);
rm = rm->next;
}
}
struct refname_hash_entry {
struct hashmap_entry ent;
struct object_id oid;
int ignore;
char refname[FLEX_ARRAY];
};
static int refname_hash_entry_cmp(const void *hashmap_cmp_fn_data,
const struct hashmap_entry *eptr,
const struct hashmap_entry *entry_or_key,
const void *keydata)
{
const struct refname_hash_entry *e1, *e2;
e1 = container_of(eptr, const struct refname_hash_entry, ent);
e2 = container_of(entry_or_key, const struct refname_hash_entry, ent);
return strcmp(e1->refname, keydata ? keydata : e2->refname);
}
static struct refname_hash_entry *refname_hash_add(struct hashmap *map,
const char *refname,
const struct object_id *oid)
{
struct refname_hash_entry *ent;
size_t len = strlen(refname);
FLEX_ALLOC_MEM(ent, refname, refname, len);
hashmap_entry_init(&ent->ent, strhash(refname));
oidcpy(&ent->oid, oid);
hashmap_add(map, &ent->ent);
return ent;
}
static int add_one_refname(const char *refname,
const struct object_id *oid,
int flag, void *cbdata)
{
struct hashmap *refname_map = cbdata;
(void) refname_hash_add(refname_map, refname, oid);
return 0;
}
static void refname_hash_init(struct hashmap *map)
{
hashmap_init(map, refname_hash_entry_cmp, NULL, 0);
}
static int refname_hash_exists(struct hashmap *map, const char *refname)
{
return !!hashmap_get_from_hash(map, strhash(refname), refname);
}
static void clear_item(struct refname_hash_entry *item)
{
item->ignore = 1;
}
static void add_already_queued_tags(const char *refname,
const struct object_id *old_oid,
const struct object_id *new_oid,
void *cb_data)
{
struct hashmap *queued_tags = cb_data;
if (starts_with(refname, "refs/tags/") && new_oid)
(void) refname_hash_add(queued_tags, refname, new_oid);
}
static void find_non_local_tags(const struct ref *refs,
struct ref_transaction *transaction,
struct ref **head,
struct ref ***tail)
{
struct hashmap existing_refs;
struct hashmap remote_refs;
struct oidset fetch_oids = OIDSET_INIT;
struct string_list remote_refs_list = STRING_LIST_INIT_NODUP;
struct string_list_item *remote_ref_item;
const struct ref *ref;
struct refname_hash_entry *item = NULL;
const int quick_flags = OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT;
refname_hash_init(&existing_refs);
refname_hash_init(&remote_refs);
create_fetch_oidset(head, &fetch_oids);
for_each_ref(add_one_refname, &existing_refs);
/*
* If we already have a transaction, then we need to filter out all
* tags which have already been queued up.
*/
if (transaction)
ref_transaction_for_each_queued_update(transaction,
add_already_queued_tags,
&existing_refs);
for (ref = refs; ref; ref = ref->next) {
if (!starts_with(ref->name, "refs/tags/"))
continue;
/*
* The peeled ref always follows the matching base
* ref, so if we see a peeled ref that we don't want
* to fetch then we can mark the ref entry in the list
* as one to ignore by setting util to NULL.
*/
if (ends_with(ref->name, "^{}")) {
if (item &&
!has_object_file_with_flags(&ref->old_oid, quick_flags) &&
!oidset_contains(&fetch_oids, &ref->old_oid) &&
!has_object_file_with_flags(&item->oid, quick_flags) &&
!oidset_contains(&fetch_oids, &item->oid))
clear_item(item);
item = NULL;
continue;
}
/*
* If item is non-NULL here, then we previously saw a
* ref not followed by a peeled reference, so we need
* to check if it is a lightweight tag that we want to
* fetch.
*/
if (item &&
!has_object_file_with_flags(&item->oid, quick_flags) &&
!oidset_contains(&fetch_oids, &item->oid))
clear_item(item);
item = NULL;
/* skip duplicates and refs that we already have */
if (refname_hash_exists(&remote_refs, ref->name) ||
refname_hash_exists(&existing_refs, ref->name))
continue;
item = refname_hash_add(&remote_refs, ref->name, &ref->old_oid);
string_list_insert(&remote_refs_list, ref->name);
}
hashmap_clear_and_free(&existing_refs, struct refname_hash_entry, ent);
/*
* We may have a final lightweight tag that needs to be
* checked to see if it needs fetching.
*/
if (item &&
!has_object_file_with_flags(&item->oid, quick_flags) &&
!oidset_contains(&fetch_oids, &item->oid))
clear_item(item);
/*
* For all the tags in the remote_refs_list,
* add them to the list of refs to be fetched
*/
for_each_string_list_item(remote_ref_item, &remote_refs_list) {
const char *refname = remote_ref_item->string;
struct ref *rm;
unsigned int hash = strhash(refname);
item = hashmap_get_entry_from_hash(&remote_refs, hash, refname,
struct refname_hash_entry, ent);
if (!item)
BUG("unseen remote ref?");
/* Unless we have already decided to ignore this item... */
if (item->ignore)
continue;
rm = alloc_ref(item->refname);
rm->peer_ref = alloc_ref(item->refname);
oidcpy(&rm->old_oid, &item->oid);
**tail = rm;
*tail = &rm->next;
}
hashmap_clear_and_free(&remote_refs, struct refname_hash_entry, ent);
string_list_clear(&remote_refs_list, 0);
oidset_clear(&fetch_oids);
}
static void filter_prefetch_refspec(struct refspec *rs)
{
int i;
if (!prefetch)
return;
for (i = 0; i < rs->nr; i++) {
struct strbuf new_dst = STRBUF_INIT;
char *old_dst;
const char *sub = NULL;
if (rs->items[i].negative)
continue;
if (!rs->items[i].dst ||
(rs->items[i].src &&
!strncmp(rs->items[i].src, "refs/tags/", 10))) {
int j;
free(rs->items[i].src);
free(rs->items[i].dst);
for (j = i + 1; j < rs->nr; j++) {
rs->items[j - 1] = rs->items[j];
rs->raw[j - 1] = rs->raw[j];
}
rs->nr--;
i--;
continue;
}
old_dst = rs->items[i].dst;
strbuf_addstr(&new_dst, "refs/prefetch/");
/*
* If old_dst starts with "refs/", then place
* sub after that prefix. Otherwise, start at
* the beginning of the string.
*/
if (!skip_prefix(old_dst, "refs/", &sub))
sub = old_dst;
strbuf_addstr(&new_dst, sub);
rs->items[i].dst = strbuf_detach(&new_dst, NULL);
rs->items[i].force = 1;
free(old_dst);
}
}
static struct ref *get_ref_map(struct remote *remote,
const struct ref *remote_refs,
struct refspec *rs,
int tags, int *autotags)
{
int i;
struct ref *rm;
struct ref *ref_map = NULL;
struct ref **tail = &ref_map;
/* opportunistically-updated references: */
struct ref *orefs = NULL, **oref_tail = &orefs;
struct hashmap existing_refs;
int existing_refs_populated = 0;
filter_prefetch_refspec(rs);
if (remote)
filter_prefetch_refspec(&remote->fetch);
if (rs->nr) {
struct refspec *fetch_refspec;
for (i = 0; i < rs->nr; i++) {
get_fetch_map(remote_refs, &rs->items[i], &tail, 0);
if (rs->items[i].dst && rs->items[i].dst[0])
*autotags = 1;
}
/* Merge everything on the command line (but not --tags) */
for (rm = ref_map; rm; rm = rm->next)
rm->fetch_head_status = FETCH_HEAD_MERGE;
/*
* For any refs that we happen to be fetching via
* command-line arguments, the destination ref might
* have been missing or have been different than the
* remote-tracking ref that would be derived from the
* configured refspec. In these cases, we want to
* take the opportunity to update their configured
* remote-tracking reference. However, we do not want
* to mention these entries in FETCH_HEAD at all, as
* they would simply be duplicates of existing
* entries, so we set them FETCH_HEAD_IGNORE below.
*
* We compute these entries now, based only on the
* refspecs specified on the command line. But we add
* them to the list following the refspecs resulting
* from the tags option so that one of the latter,
* which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
* by ref_remove_duplicates() in favor of one of these
* opportunistic entries with FETCH_HEAD_IGNORE.
*/
if (refmap.nr)
fetch_refspec = &refmap;
else
fetch_refspec = &remote->fetch;
for (i = 0; i < fetch_refspec->nr; i++)
get_fetch_map(ref_map, &fetch_refspec->items[i], &oref_tail, 1);
} else if (refmap.nr) {
die("--refmap option is only meaningful with command-line refspec(s)");
} else {
/* Use the defaults */
struct branch *branch = branch_get(NULL);
int has_merge = branch_has_merge_config(branch);
if (remote &&
(remote->fetch.nr ||
/* Note: has_merge implies non-NULL branch->remote_name */
(has_merge && !strcmp(branch->remote_name, remote->name)))) {
for (i = 0; i < remote->fetch.nr; i++) {
get_fetch_map(remote_refs, &remote->fetch.items[i], &tail, 0);
if (remote->fetch.items[i].dst &&
remote->fetch.items[i].dst[0])
*autotags = 1;
if (!i && !has_merge && ref_map &&
!remote->fetch.items[0].pattern)
ref_map->fetch_head_status = FETCH_HEAD_MERGE;
}
/*
* if the remote we're fetching from is the same
* as given in branch.<name>.remote, we add the
* ref given in branch.<name>.merge, too.
*
* Note: has_merge implies non-NULL branch->remote_name
*/
if (has_merge &&
!strcmp(branch->remote_name, remote->name))
add_merge_config(&ref_map, remote_refs, branch, &tail);
} else if (!prefetch) {
ref_map = get_remote_ref(remote_refs, "HEAD");
if (!ref_map)
die(_("couldn't find remote ref HEAD"));
ref_map->fetch_head_status = FETCH_HEAD_MERGE;
tail = &ref_map->next;
}
}
if (tags == TAGS_SET)
/* also fetch all tags */
get_fetch_map(remote_refs, tag_refspec, &tail, 0);
else if (tags == TAGS_DEFAULT && *autotags)
find_non_local_tags(remote_refs, NULL, &ref_map, &tail);
/* Now append any refs to be updated opportunistically: */
*tail = orefs;
for (rm = orefs; rm; rm = rm->next) {
rm->fetch_head_status = FETCH_HEAD_IGNORE;
tail = &rm->next;
}
/*
* apply negative refspecs first, before we remove duplicates. This is
* necessary as negative refspecs might remove an otherwise conflicting
* duplicate.
*/
if (rs->nr)
ref_map = apply_negative_refspecs(ref_map, rs);
else
ref_map = apply_negative_refspecs(ref_map, &remote->fetch);
ref_map = ref_remove_duplicates(ref_map);
for (rm = ref_map; rm; rm = rm->next) {
if (rm->peer_ref) {
const char *refname = rm->peer_ref->name;
struct refname_hash_entry *peer_item;
unsigned int hash = strhash(refname);
if (!existing_refs_populated) {
refname_hash_init(&existing_refs);
for_each_ref(add_one_refname, &existing_refs);
existing_refs_populated = 1;
}
peer_item = hashmap_get_entry_from_hash(&existing_refs,
hash, refname,
struct refname_hash_entry, ent);
if (peer_item) {
struct object_id *old_oid = &peer_item->oid;
oidcpy(&rm->peer_ref->old_oid, old_oid);
}
}
}
if (existing_refs_populated)
hashmap_clear_and_free(&existing_refs, struct refname_hash_entry, ent);
return ref_map;
}
#define STORE_REF_ERROR_OTHER 1
#define STORE_REF_ERROR_DF_CONFLICT 2
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 *our_transaction = NULL;
struct strbuf err = STRBUF_INIT;
int ret;
if (dry_run)
return 0;
if (!rla)
rla = default_rla.buf;
msg = xstrfmt("%s: %s", rla, action);
/*
* 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_update(transaction, ref->name, &ref->new_oid,
check_old ? &ref->old_oid : NULL,
0, msg, &err);
if (ret) {
ret = STORE_REF_ERROR_OTHER;
goto out;
}
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 ret;
}
static int refcol_width = 10;
static int compact_format;
static void adjust_refcol_width(const struct ref *ref)
{
int max, rlen, llen, len;
/* uptodate lines are only shown on high verbosity level */
if (verbosity <= 0 && oideq(&ref->peer_ref->old_oid, &ref->old_oid))
return;
max = term_columns();
rlen = utf8_strwidth(prettify_refname(ref->name));
llen = utf8_strwidth(prettify_refname(ref->peer_ref->name));
/*
* rough estimation to see if the output line is too long and
* should not be counted (we can't do precise calculation
* anyway because we don't know if the error explanation part
* will be printed in update_local_ref)
*/
if (compact_format) {
llen = 0;
max = max * 2 / 3;
}
len = 21 /* flag and summary */ + rlen + 4 /* -> */ + llen;
if (len >= max)
return;
/*
* Not precise calculation for compact mode because '*' can
* appear on the left hand side of '->' and shrink the column
* back.
*/
if (refcol_width < rlen)
refcol_width = rlen;
}
static void prepare_format_display(struct ref *ref_map)
{
struct ref *rm;
const char *format = "full";
if (verbosity < 0)
return;
git_config_get_string_tmp("fetch.output", &format);
if (!strcasecmp(format, "full"))
compact_format = 0;
else if (!strcasecmp(format, "compact"))
compact_format = 1;
else
die(_("invalid value for '%s': '%s'"),
"fetch.output", format);
for (rm = ref_map; rm; rm = rm->next) {
if (rm->status == REF_STATUS_REJECT_SHALLOW ||
!rm->peer_ref ||
!strcmp(rm->name, "HEAD"))
continue;
adjust_refcol_width(rm);
}
}
static void print_remote_to_local(struct strbuf *display,
const char *remote, const char *local)
{
strbuf_addf(display, "%-*s -> %s", refcol_width, remote, local);
}
static int find_and_replace(struct strbuf *haystack,
const char *needle,
const char *placeholder)
{
const char *p = NULL;
int plen, nlen;
nlen = strlen(needle);
if (ends_with(haystack->buf, needle))
p = haystack->buf + haystack->len - nlen;
else
p = strstr(haystack->buf, needle);
if (!p)
return 0;
if (p > haystack->buf && p[-1] != '/')
return 0;
plen = strlen(p);
if (plen > nlen && p[nlen] != '/')
return 0;
strbuf_splice(haystack, p - haystack->buf, nlen,
placeholder, strlen(placeholder));
return 1;
}
static void print_compact(struct strbuf *display,
const char *remote, const char *local)
{
struct strbuf r = STRBUF_INIT;
struct strbuf l = STRBUF_INIT;
if (!strcmp(remote, local)) {
strbuf_addf(display, "%-*s -> *", refcol_width, remote);
return;
}
strbuf_addstr(&r, remote);
strbuf_addstr(&l, local);
if (!find_and_replace(&r, local, "*"))
find_and_replace(&l, remote, "*");
print_remote_to_local(display, r.buf, l.buf);
strbuf_release(&r);
strbuf_release(&l);
}
static void format_display(struct strbuf *display, char code,
const char *summary, const char *error,
const char *remote, const char *local,
int summary_width)
{
int width;
if (verbosity < 0)
return;
width = (summary_width + strlen(summary) - gettext_width(summary));
strbuf_addf(display, "%c %-*s ", code, width, summary);
if (!compact_format)
print_remote_to_local(display, remote, local);
else
print_compact(display, remote, local);
if (error)
strbuf_addf(display, " (%s)", error);
}
static int update_local_ref(struct ref *ref,
struct ref_transaction *transaction,
const char *remote, const struct ref *remote_ref,
struct strbuf *display, int summary_width,
struct worktree **worktrees)
{
struct commit *current = NULL, *updated;
const struct worktree *wt;
const char *pretty_ref = prettify_refname(ref->name);
int fast_forward = 0;
if (!repo_has_object_file(the_repository, &ref->new_oid))
die(_("object %s not found"), oid_to_hex(&ref->new_oid));
if (oideq(&ref->old_oid, &ref->new_oid)) {
if (verbosity > 0)
format_display(display, '=', _("[up to date]"), NULL,
remote, pretty_ref, summary_width);
return 0;
}
if (!update_head_ok &&
(wt = find_shared_symref(worktrees, "HEAD", ref->name)) &&
!wt->is_bare && !is_null_oid(&ref->old_oid)) {
/*
* If this is the head, and it's not okay to update
* the head, and the old value of the head isn't empty...
*/
format_display(display, '!', _("[rejected]"),
wt->is_current ?
_("can't fetch in current branch") :
_("checked out in another worktree"),
remote, pretty_ref, summary_width);
return 1;
}
if (!is_null_oid(&ref->old_oid) &&
starts_with(ref->name, "refs/tags/")) {
if (force || ref->force) {
int r;
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);
return r;
} else {
format_display(display, '!', _("[rejected]"), _("would clobber existing tag"),
remote, pretty_ref, summary_width);
return 1;
}
}
current = lookup_commit_reference_gently(the_repository,
&ref->old_oid, 1);
updated = lookup_commit_reference_gently(the_repository,
&ref->new_oid, 1);
if (!current || !updated) {
const char *msg;
const char *what;
int r;
/*
* Nicely describe the new ref we're fetching.
* Base this on the remote's ref name, as it's
* more likely to follow a standard layout.
*/
const char *name = remote_ref ? remote_ref->name : "";
if (starts_with(name, "refs/tags/")) {
msg = "storing tag";
what = _("[new tag]");
} else if (starts_with(name, "refs/heads/")) {
msg = "storing head";
what = _("[new branch]");
} else {
msg = "storing ref";
what = _("[new ref]");
}
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);
return r;
}
if (fetch_show_forced_updates) {
uint64_t t_before = getnanotime();
fast_forward = in_merge_bases(current, updated);
forced_updates_ms += (getnanotime() - t_before) / 1000000;
} else {
fast_forward = 1;
}
if (fast_forward) {
struct strbuf quickref = STRBUF_INIT;
int r;
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, transaction, 1);
format_display(display, r ? '!' : ' ', quickref.buf,
r ? _("unable to update local ref") : NULL,
remote, pretty_ref, summary_width);
strbuf_release(&quickref);
return r;
} else if (force || ref->force) {
struct strbuf quickref = STRBUF_INIT;
int r;
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, transaction, 1);
format_display(display, r ? '!' : '+', quickref.buf,
r ? _("unable to update local ref") : _("forced update"),
remote, pretty_ref, summary_width);
strbuf_release(&quickref);
return r;
} else {
format_display(display, '!', _("[rejected]"), _("non-fast-forward"),
remote, pretty_ref, summary_width);
return 1;
}
}
static const struct object_id *iterate_ref_map(void *cb_data)
{
struct ref **rm = cb_data;
struct ref *ref = *rm;
while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
ref = ref->next;
if (!ref)
return NULL;
*rm = ref->next;
return &ref->old_oid;
}
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"
"flag or run 'git config fetch.showForcedUpdates true'");
static const char warn_time_show_forced_updates[] =
N_("it took %.2f seconds to check forced updates; you can use\n"
"'--no-show-forced-updates' or run 'git config fetch.showForcedUpdates false'\n"
"to avoid this check\n");
static int store_updated_refs(const char *raw_url, const char *remote_name,
int connectivity_checked,
struct ref_transaction *transaction, struct ref *ref_map,
struct fetch_head *fetch_head, struct worktree **worktrees)
{
int url_len, i, rc = 0;
struct strbuf note = STRBUF_INIT, err = STRBUF_INIT;
const char *what, *kind;
struct ref *rm;
char *url;
int want_status;
int summary_width = 0;
if (verbosity >= 0)
summary_width = transport_summary_width(ref_map);
if (raw_url)
url = transport_anonymize_url(raw_url);
else
url = xstrdup("foreign");
if (!connectivity_checked) {
struct check_connected_options opt = CHECK_CONNECTED_INIT;
rm = ref_map;
if (check_connected(iterate_ref_map, &rm, &opt)) {
rc = error(_("%s did not send all necessary objects\n"), url);
goto abort;
}
}
prepare_format_display(ref_map);
/*
* We do a pass for each fetch_head_status type in their enum order, so
* merged entries are written before not-for-merge. That lets readers
* use FETCH_HEAD as a refname to refer to the ref to be merged.
*/
for (want_status = FETCH_HEAD_MERGE;
want_status <= FETCH_HEAD_IGNORE;
want_status++) {
for (rm = ref_map; rm; rm = rm->next) {
struct ref *ref = NULL;
if (rm->status == REF_STATUS_REJECT_SHALLOW) {
if (want_status == FETCH_HEAD_MERGE)
warning(_("rejected %s because shallow roots are not allowed to be updated"),
rm->peer_ref ? rm->peer_ref->name : rm->name);
continue;
}
/*
* When writing FETCH_HEAD we need to determine whether
* we already have the commit or not. If not, then the
* reference is not for merge and needs to be written
* to the reflog after other commits which we already
* have. We're not interested in this property though
* in case FETCH_HEAD is not to be updated, so we can
* skip the classification in that case.
*/
if (fetch_head->fp) {
struct commit *commit = NULL;
/*
* References in "refs/tags/" are often going to point
* to annotated tags, which are not part of the
* commit-graph. We thus only try to look up refs in
* the graph which are not in that namespace to not
* regress performance in repositories with many
* annotated tags.
*/
if (!starts_with(rm->name, "refs/tags/"))
commit = lookup_commit_in_graph(the_repository, &rm->old_oid);
if (!commit) {
commit = lookup_commit_reference_gently(the_repository,
&rm->old_oid,
1);
if (!commit)
rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
}
}
if (rm->fetch_head_status != want_status)
continue;
if (rm->peer_ref) {
ref = alloc_ref(rm->peer_ref->name);
oidcpy(&ref->old_oid, &rm->peer_ref->old_oid);
oidcpy(&ref->new_oid, &rm->old_oid);
ref->force = rm->peer_ref->force;
}
if (recurse_submodules != RECURSE_SUBMODULES_OFF &&
(!rm->peer_ref || !oideq(&ref->old_oid, &ref->new_oid))) {
check_for_new_submodule_commits(&rm->old_oid);
}
if (!strcmp(rm->name, "HEAD")) {
kind = "";
what = "";
}
else if (skip_prefix(rm->name, "refs/heads/", &what))
kind = "branch";
else if (skip_prefix(rm->name, "refs/tags/", &what))
kind = "tag";
else if (skip_prefix(rm->name, "refs/remotes/", &what))
kind = "remote-tracking branch";
else {
kind = "";
what = rm->name;
}
url_len = strlen(url);
for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
;
url_len = i + 1;
if (4 < i && !strncmp(".git", url + i - 3, 4))
url_len = i - 3;
strbuf_reset(&note);
if (*what) {
if (*kind)
strbuf_addf(&note, "%s ", kind);
strbuf_addf(&note, "'%s' of ", what);
}
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, transaction, what,
rm, &note, summary_width,
worktrees);
free(ref);
} else if (write_fetch_head || dry_run) {
/*
* Display fetches written to FETCH_HEAD (or
* would be written to FETCH_HEAD, if --dry-run
* is set).
*/
format_display(&note, '*',
*kind ? kind : "branch", NULL,
*what ? what : "HEAD",
"FETCH_HEAD", summary_width);
}
if (note.len) {
if (!shown_url) {
fprintf(stderr, _("From %.*s\n"),
url_len, url);
shown_url = 1;
}
fprintf(stderr, " %s\n", note.buf);
}
}
}
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 "
"branches"), remote_name);
if (advice_enabled(ADVICE_FETCH_SHOW_FORCED_UPDATES)) {
if (!fetch_show_forced_updates) {
warning(_(warn_show_forced_updates));
} else if (forced_updates_ms > FORCED_UPDATES_DELAY_WARNING_IN_MS) {
warning(_(warn_time_show_forced_updates),
forced_updates_ms / 1000.0);
}
}
abort:
strbuf_release(&note);
strbuf_release(&err);
free(url);
return rc;
}
/*
* We would want to bypass the object transfer altogether if
* everything we are going to fetch already exists and is connected
* locally.
*/
static int check_exist_and_connected(struct ref *ref_map)
{
struct ref *rm = ref_map;
struct check_connected_options opt = CHECK_CONNECTED_INIT;
struct ref *r;
/*
* If we are deepening a shallow clone we already have these
* objects reachable. Running rev-list here will return with
* a good (0) exit status and we'll bypass the fetch that we
* really need to perform. Claiming failure now will ensure
* we perform the network exchange to deepen our history.
*/
if (deepen)
return -1;
/*
* Similarly, if we need to refetch, we always want to perform a full
* fetch ignoring existing objects.
*/
if (refetch)
return -1;
/*
* check_connected() allows objects to merely be promised, but
* we need all direct targets to exist.
*/
for (r = rm; r; r = r->next) {
if (!has_object_file_with_flags(&r->old_oid,
OBJECT_INFO_SKIP_FETCH_OBJECT))
return -1;
}
opt.quiet = 1;
return check_connected(iterate_ref_map, &rm, &opt);
}
static int fetch_and_consume_refs(struct transport *transport,
struct ref_transaction *transaction,
struct ref *ref_map,
struct fetch_head *fetch_head,
struct worktree **worktrees)
{
int connectivity_checked = 1;
int ret;
/*
* We don't need to perform a fetch in case we can already satisfy all
* refs.
*/
ret = check_exist_and_connected(ref_map);
if (ret) {
trace2_region_enter("fetch", "fetch_refs", the_repository);
ret = transport_fetch_refs(transport, ref_map);
trace2_region_leave("fetch", "fetch_refs", the_repository);
if (ret)
goto out;
connectivity_checked = transport->smart_options ?
transport->smart_options->connectivity_checked : 0;
}
trace2_region_enter("fetch", "consume_refs", the_repository);
ret = store_updated_refs(transport->url, transport->remote->name,
connectivity_checked, transaction, ref_map,
fetch_head, worktrees);
trace2_region_leave("fetch", "consume_refs", the_repository);
out:
transport_unlock_pack(transport, 0);
return ret;
}
static int prune_refs(struct refspec *rs,
struct ref_transaction *transaction,
struct ref *ref_map,
const char *raw_url)
{
int url_len, i, result = 0;
struct ref *ref, *stale_refs = get_stale_heads(rs, ref_map);
struct strbuf err = STRBUF_INIT;
char *url;
const char *dangling_msg = dry_run
? _(" (%s will become dangling)")
: _(" (%s has become dangling)");
if (raw_url)
url = transport_anonymize_url(raw_url);
else
url = xstrdup("foreign");
url_len = strlen(url);
for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
;
url_len = i + 1;
if (4 < i && !strncmp(".git", url + i - 3, 4))
url_len = i - 3;
if (!dry_run) {
if (transaction) {
for (ref = stale_refs; ref; ref = ref->next) {
result = ref_transaction_delete(transaction, ref->name, NULL, 0,
"fetch: prune", &err);
if (result)
goto cleanup;
}
} else {
struct string_list refnames = STRING_LIST_INIT_NODUP;
for (ref = stale_refs; ref; ref = ref->next)
string_list_append(&refnames, ref->name);
result = delete_refs("fetch: prune", &refnames, 0);
string_list_clear(&refnames, 0);
}
}
if (verbosity >= 0) {
int summary_width = transport_summary_width(stale_refs);
for (ref = stale_refs; ref; ref = ref->next) {
struct strbuf sb = STRBUF_INIT;
if (!shown_url) {
fprintf(stderr, _("From %.*s\n"), url_len, url);
shown_url = 1;
}
format_display(&sb, '-', _("[deleted]"), NULL,
_("(none)"), prettify_refname(ref->name),
summary_width);
fprintf(stderr, " %s\n",sb.buf);
strbuf_release(&sb);
warn_dangling_symref(stderr, dangling_msg, ref->name);
}
}
cleanup:
strbuf_release(&err);
free(url);
free_refs(stale_refs);
return result;
}
static void check_not_current_branch(struct ref *ref_map,
struct worktree **worktrees)
{
const struct worktree *wt;
for (; ref_map; ref_map = ref_map->next)
if (ref_map->peer_ref &&
(wt = find_shared_symref(worktrees, "HEAD",
ref_map->peer_ref->name)) &&
!wt->is_bare)
die(_("refusing to fetch into branch '%s' "
"checked out at '%s'"),
ref_map->peer_ref->name, wt->path);
}
static int truncate_fetch_head(void)
{
const char *filename = git_path_fetch_head(the_repository);
FILE *fp = fopen_for_writing(filename);
if (!fp)
return error_errno(_("cannot open '%s'"), filename);
fclose(fp);
return 0;
}
static void set_option(struct transport *transport, const char *name, const char *value)
{
int r = transport_set_option(transport, name, value);
if (r < 0)
die(_("option \"%s\" value \"%s\" is not valid for %s"),
name, value, transport->url);
if (r > 0)
warning(_("option \"%s\" is ignored for %s\n"),
name, transport->url);
}
static int add_oid(const char *refname, const struct object_id *oid, int flags,
void *cb_data)
{
struct oid_array *oids = cb_data;
oid_array_append(oids, oid);
return 0;
}
static void add_negotiation_tips(struct git_transport_options *smart_options)
{
struct oid_array *oids = xcalloc(1, sizeof(*oids));
int i;
for (i = 0; i < negotiation_tip.nr; i++) {
const char *s = negotiation_tip.items[i].string;
int old_nr;
if (!has_glob_specials(s)) {
struct object_id oid;
if (get_oid(s, &oid))
die(_("%s is not a valid object"), s);
if (!has_object(the_repository, &oid, 0))
die(_("the object %s does not exist"), s);
oid_array_append(oids, &oid);
continue;
}
old_nr = oids->nr;
for_each_glob_ref(add_oid, s, oids);
if (old_nr == oids->nr)
warning("ignoring --negotiation-tip=%s because it does not match any refs",
s);
}
smart_options->negotiation_tips = oids;
}
static struct transport *prepare_transport(struct remote *remote, int deepen)
{
struct transport *transport;
transport = transport_get(remote, NULL);
transport_set_verbosity(transport, verbosity, progress);
transport->family = family;
if (upload_pack)
set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
if (keep)
set_option(transport, TRANS_OPT_KEEP, "yes");
if (depth)
set_option(transport, TRANS_OPT_DEPTH, depth);
if (deepen && deepen_since)
set_option(transport, TRANS_OPT_DEEPEN_SINCE, deepen_since);
if (deepen && deepen_not.nr)
set_option(transport, TRANS_OPT_DEEPEN_NOT,
(const char *)&deepen_not);
if (deepen_relative)
set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, "yes");
if (update_shallow)
set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
if (refetch)
set_option(transport, TRANS_OPT_REFETCH, "yes");
if (filter_options.choice) {
const char *spec =
expand_list_objects_filter_spec(&filter_options);
set_option(transport, TRANS_OPT_LIST_OBJECTS_FILTER, spec);
set_option(transport, TRANS_OPT_FROM_PROMISOR, "1");
}
if (negotiation_tip.nr) {
if (transport->smart_options)
add_negotiation_tips(transport->smart_options);
else
warning("ignoring --negotiation-tip because the protocol does not support it");
}
return transport;
}
static int backfill_tags(struct transport *transport,
struct ref_transaction *transaction,
struct ref *ref_map,
struct fetch_head *fetch_head,
struct worktree **worktrees)
{
int retcode, cannot_reuse;
/*
* Once we have set TRANS_OPT_DEEPEN_SINCE, we can't unset it
* when remote helper is used (setting it to an empty string
* is not unsetting). We could extend the remote helper
* protocol for that, but for now, just force a new connection
* without deepen-since. Similar story for deepen-not.
*/
cannot_reuse = transport->cannot_reuse ||
deepen_since || deepen_not.nr;
if (cannot_reuse) {
gsecondary = prepare_transport(transport->remote, 0);
transport = gsecondary;
}
transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
transport_set_option(transport, TRANS_OPT_DEPTH, "0");
transport_set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, NULL);
retcode = fetch_and_consume_refs(transport, transaction, ref_map, fetch_head, worktrees);
if (gsecondary) {
transport_disconnect(gsecondary);
gsecondary = NULL;
}
return retcode;
}
static int do_fetch(struct transport *transport,
struct refspec *rs)
{
struct ref_transaction *transaction = NULL;
struct ref *ref_map = NULL;
int autotags = (transport->remote->fetch_tags == 1);
int retcode = 0;
const struct ref *remote_refs;
struct transport_ls_refs_options transport_ls_refs_options =
TRANSPORT_LS_REFS_OPTIONS_INIT;
int must_list_refs = 1;
struct worktree **worktrees = get_worktrees();
struct fetch_head fetch_head = { 0 };
struct strbuf err = STRBUF_INIT;
if (tags == TAGS_DEFAULT) {
if (transport->remote->fetch_tags == 2)
tags = TAGS_SET;
if (transport->remote->fetch_tags == -1)
tags = TAGS_UNSET;
}
/* if not appending, truncate FETCH_HEAD */
if (!append && write_fetch_head) {
retcode = truncate_fetch_head();
if (retcode)
goto cleanup;
}
if (rs->nr) {
int i;
refspec_ref_prefixes(rs, &transport_ls_refs_options.ref_prefixes);
/*
* We can avoid listing refs if all of them are exact
* OIDs
*/
must_list_refs = 0;
for (i = 0; i < rs->nr; i++) {
if (!rs->items[i].exact_sha1) {
must_list_refs = 1;
break;
}
}
} else if (transport->remote && transport->remote->fetch.nr)
refspec_ref_prefixes(&transport->remote->fetch,
&transport_ls_refs_options.ref_prefixes);
if (tags == TAGS_SET || tags == TAGS_DEFAULT) {
must_list_refs = 1;
if (transport_ls_refs_options.ref_prefixes.nr)
strvec_push(&transport_ls_refs_options.ref_prefixes,
"refs/tags/");
}
if (must_list_refs) {
trace2_region_enter("fetch", "remote_refs", the_repository);
remote_refs = transport_get_remote_refs(transport,
&transport_ls_refs_options);
trace2_region_leave("fetch", "remote_refs", the_repository);
} else
remote_refs = NULL;
transport_ls_refs_options_release(&transport_ls_refs_options);
ref_map = get_ref_map(transport->remote, remote_refs, rs,
tags, &autotags);
if (!update_head_ok)
check_not_current_branch(ref_map, worktrees);
retcode = open_fetch_head(&fetch_head);
if (retcode)
goto cleanup;
if (atomic_fetch) {
transaction = ref_transaction_begin(&err);
if (!transaction) {
retcode = error("%s", err.buf);
goto cleanup;
}
}
if (tags == TAGS_DEFAULT && autotags)
transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
if (prune) {
/*
* We only prune based on refspecs specified
* explicitly (via command line or configuration); we
* don't care whether --tags was specified.
*/
if (rs->nr) {
retcode = prune_refs(rs, transaction, ref_map, transport->url);
} else {
retcode = prune_refs(&transport->remote->fetch,
transaction, ref_map,
transport->url);
}
if (retcode != 0)
retcode = 1;
}
if (fetch_and_consume_refs(transport, transaction, ref_map, &fetch_head, worktrees)) {
retcode = 1;
goto cleanup;
}
/*
* If neither --no-tags nor --tags was specified, do automated tag
* following.
*/
if (tags == TAGS_DEFAULT && autotags) {
struct ref *tags_ref_map = NULL, **tail = &tags_ref_map;
find_non_local_tags(remote_refs, transaction, &tags_ref_map, &tail);
if (tags_ref_map) {
/*
* If backfilling of tags fails then we want to tell
* the user so, but we have to continue regardless to
* populate upstream information of the references we
* have already fetched above. The exception though is
* when `--atomic` is passed: in that case we'll abort
* the transaction and don't commit anything.
*/
if (backfill_tags(transport, transaction, tags_ref_map,
&fetch_head, worktrees))
retcode = 1;
}
free_refs(tags_ref_map);
}
if (transaction) {
if (retcode)
goto cleanup;
retcode = ref_transaction_commit(transaction, &err);
if (retcode) {
error("%s", err.buf);
ref_transaction_free(transaction);
transaction = NULL;
goto cleanup;
}
}
commit_fetch_head(&fetch_head);
if (set_upstream) {
struct branch *branch = branch_get("HEAD");
struct ref *rm;
struct ref *source_ref = NULL;
/*
* We're setting the upstream configuration for the
* current branch. The relevant upstream is the
* fetched branch that is meant to be merged with the
* current one, i.e. the one fetched to FETCH_HEAD.
*
* When there are several such branches, consider the
* request ambiguous and err on the safe side by doing
* nothing and just emit a warning.
*/
for (rm = ref_map; rm; rm = rm->next) {
if (!rm->peer_ref) {
if (source_ref) {
warning(_("multiple branches detected, incompatible with --set-upstream"));
goto cleanup;
} else {
source_ref = rm;
}
}
}
if (source_ref) {
if (!branch) {
const char *shortname = source_ref->name;
skip_prefix(shortname, "refs/heads/", &shortname);
warning(_("could not set upstream of HEAD to '%s' from '%s' when "
"it does not point to any branch."),
shortname, transport->remote->name);
goto cleanup;
}
if (!strcmp(source_ref->name, "HEAD") ||
starts_with(source_ref->name, "refs/heads/"))
install_branch_config(0,
branch->name,
transport->remote->name,
source_ref->name);
else if (starts_with(source_ref->name, "refs/remotes/"))
warning(_("not setting upstream for a remote remote-tracking branch"));
else if (starts_with(source_ref->name, "refs/tags/"))
warning(_("not setting upstream for a remote tag"));
else
warning(_("unknown branch type"));
} else {
warning(_("no source branch found;\n"
"you need to specify exactly one branch with the --set-upstream option"));
}
}
cleanup:
if (retcode && transaction) {
ref_transaction_abort(transaction, &err);
error("%s", err.buf);
}
close_fetch_head(&fetch_head);
strbuf_release(&err);
free_refs(ref_map);
free_worktrees(worktrees);
return retcode;
}
static int get_one_remote_for_fetch(struct remote *remote, void *priv)
{
struct string_list *list = priv;
if (!remote->skip_default_update)
string_list_append(list, remote->name);
return 0;
}
struct remote_group_data {
const char *name;
struct string_list *list;
};
static int get_remote_group(const char *key, const char *value, void *priv)
{
struct remote_group_data *g = priv;
if (skip_prefix(key, "remotes.", &key) && !strcmp(key, g->name)) {
/* split list by white space */
while (*value) {
size_t wordlen = strcspn(value, " \t\n");
if (wordlen >= 1)
string_list_append_nodup(g->list,
xstrndup(value, wordlen));
value += wordlen + (value[wordlen] != '\0');
}
}
return 0;
}
static int add_remote_or_group(const char *name, struct string_list *list)
{
int prev_nr = list->nr;
struct remote_group_data g;
g.name = name; g.list = list;
git_config(get_remote_group, &g);
if (list->nr == prev_nr) {
struct remote *remote = remote_get(name);
if (!remote_is_configured(remote, 0))
return 0;
string_list_append(list, remote->name);
}
return 1;
}
static void add_options_to_argv(struct strvec *argv)
{
if (dry_run)
strvec_push(argv, "--dry-run");
if (prune != -1)
strvec_push(argv, prune ? "--prune" : "--no-prune");
if (prune_tags != -1)
strvec_push(argv, prune_tags ? "--prune-tags" : "--no-prune-tags");
if (update_head_ok)
strvec_push(argv, "--update-head-ok");
if (force)
strvec_push(argv, "--force");
if (keep)
strvec_push(argv, "--keep");
if (recurse_submodules == RECURSE_SUBMODULES_ON)
strvec_push(argv, "--recurse-submodules");
else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
strvec_push(argv, "--recurse-submodules=on-demand");
if (tags == TAGS_SET)
strvec_push(argv, "--tags");
else if (tags == TAGS_UNSET)
strvec_push(argv, "--no-tags");
if (verbosity >= 2)
strvec_push(argv, "-v");
if (verbosity >= 1)
strvec_push(argv, "-v");
else if (verbosity < 0)
strvec_push(argv, "-q");
if (family == TRANSPORT_FAMILY_IPV4)
strvec_push(argv, "--ipv4");
else if (family == TRANSPORT_FAMILY_IPV6)
strvec_push(argv, "--ipv6");
}
/* Fetch multiple remotes in parallel */
struct parallel_fetch_state {
const char **argv;
struct string_list *remotes;
int next, result;
};
static int fetch_next_remote(struct child_process *cp, struct strbuf *out,
void *cb, void **task_cb)
{
struct parallel_fetch_state *state = cb;
char *remote;
if (state->next < 0 || state->next >= state->remotes->nr)
return 0;
remote = state->remotes->items[state->next++].string;
*task_cb = remote;
strvec_pushv(&cp->args, state->argv);
strvec_push(&cp->args, remote);
cp->git_cmd = 1;
if (verbosity >= 0)
printf(_("Fetching %s\n"), remote);
return 1;
}
static int fetch_failed_to_start(struct strbuf *out, void *cb, void *task_cb)
{
struct parallel_fetch_state *state = cb;
const char *remote = task_cb;
state->result = error(_("could not fetch %s"), remote);
return 0;
}
static int fetch_finished(int result, struct strbuf *out,
void *cb, void *task_cb)
{
struct parallel_fetch_state *state = cb;
const char *remote = task_cb;
if (result) {
strbuf_addf(out, _("could not fetch '%s' (exit code: %d)\n"),
remote, result);
state->result = -1;
}
return 0;
}
static int fetch_multiple(struct string_list *list, int max_children)
{
int i, result = 0;
struct strvec argv = STRVEC_INIT;
if (!append && write_fetch_head) {
int errcode = truncate_fetch_head();
if (errcode)
return errcode;
}
strvec_pushl(&argv, "fetch", "--append", "--no-auto-gc",
"--no-write-commit-graph", NULL);
add_options_to_argv(&argv);
if (max_children != 1 && list->nr != 1) {
struct parallel_fetch_state state = { argv.v, list, 0, 0 };
strvec_push(&argv, "--end-of-options");
result = run_processes_parallel_tr2(max_children,
&fetch_next_remote,
&fetch_failed_to_start,
&fetch_finished,
&state,
"fetch", "parallel/fetch");
if (!result)
result = state.result;
} else
for (i = 0; i < list->nr; i++) {
const char *name = list->items[i].string;
strvec_push(&argv, name);
if (verbosity >= 0)
printf(_("Fetching %s\n"), name);
if (run_command_v_opt(argv.v, RUN_GIT_CMD)) {
error(_("could not fetch %s"), name);
result = 1;
}
strvec_pop(&argv);
}
strvec_clear(&argv);
return !!result;
}
/*
* Fetching from the promisor remote should use the given filter-spec
* or inherit the default filter-spec from the config.
*/
static inline void fetch_one_setup_partial(struct remote *remote)
{
/*
* Explicit --no-filter argument overrides everything, regardless
* of any prior partial clones and fetches.
*/
if (filter_options.no_filter)
return;
/*
* If no prior partial clone/fetch and the current fetch DID NOT
* request a partial-fetch, do a normal fetch.
*/
if (!has_promisor_remote() && !filter_options.choice)
return;
/*
* If this is a partial-fetch request, we enable partial on
* this repo if not already enabled and remember the given
* filter-spec as the default for subsequent fetches to this
* remote if there is currently no default filter-spec.
*/
if (filter_options.choice) {
partial_clone_register(remote->name, &filter_options);
return;
}
/*
* Do a partial-fetch from the promisor remote using either the
* explicitly given filter-spec or inherit the filter-spec from
* the config.
*/
if (!filter_options.choice)
partial_clone_get_default_filter_spec(&filter_options, remote->name);
return;
}
static int fetch_one(struct remote *remote, int argc, const char **argv,
int prune_tags_ok, int use_stdin_refspecs)
{
struct refspec rs = REFSPEC_INIT_FETCH;
int i;
int exit_code;
int maybe_prune_tags;
int remote_via_config = remote_is_configured(remote, 0);
if (!remote)
die(_("no remote repository specified; please specify either a URL or a\n"
"remote name from which new revisions should be fetched"));
gtransport = prepare_transport(remote, 1);
if (prune < 0) {
/* no command line request */
if (0 <= remote->prune)
prune = remote->prune;
else if (0 <= fetch_prune_config)
prune = fetch_prune_config;
else
prune = PRUNE_BY_DEFAULT;
}
if (prune_tags < 0) {
/* no command line request */
if (0 <= remote->prune_tags)
prune_tags = remote->prune_tags;
else if (0 <= fetch_prune_tags_config)
prune_tags = fetch_prune_tags_config;
else
prune_tags = PRUNE_TAGS_BY_DEFAULT;
}
maybe_prune_tags = prune_tags_ok && prune_tags;
if (maybe_prune_tags && remote_via_config)
refspec_append(&remote->fetch, TAG_REFSPEC);
if (maybe_prune_tags && (argc || !remote_via_config))
refspec_append(&rs, TAG_REFSPEC);
for (i = 0; i < argc; i++) {
if (!strcmp(argv[i], "tag")) {
i++;
if (i >= argc)
die(_("you need to specify a tag name"));
refspec_appendf(&rs, "refs/tags/%s:refs/tags/%s",
argv[i], argv[i]);
} else {
refspec_append(&rs, argv[i]);
}
}
if (use_stdin_refspecs) {
struct strbuf line = STRBUF_INIT;
while (strbuf_getline_lf(&line, stdin) != EOF)
refspec_append(&rs, line.buf);
strbuf_release(&line);
}
if (server_options.nr)
gtransport->server_options = &server_options;
sigchain_push_common(unlock_pack_on_signal);
atexit(unlock_pack_atexit);
sigchain_push(SIGPIPE, SIG_IGN);
exit_code = do_fetch(gtransport, &rs);
sigchain_pop(SIGPIPE);
refspec_clear(&rs);
transport_disconnect(gtransport);
gtransport = NULL;
return exit_code;
}
int cmd_fetch(int argc, const char **argv, const char *prefix)
{
int i;
struct string_list list = STRING_LIST_INIT_DUP;
struct remote *remote = NULL;
int result = 0;
int prune_tags_ok = 1;
packet_trace_identity("fetch");
/* Record the command line for the reflog */
strbuf_addstr(&default_rla, "fetch");
for (i = 1; i < argc; i++) {
/* This handles non-URLs gracefully */
char *anon = transport_anonymize_url(argv[i]);
strbuf_addf(&default_rla, " %s", anon);
free(anon);
}
git_config(git_fetch_config, NULL);
if (the_repository->gitdir) {
prepare_repo_settings(the_repository);
the_repository->settings.command_requires_full_index = 0;
}
argc = parse_options(argc, argv, prefix,
builtin_fetch_options, builtin_fetch_usage, 0);
if (recurse_submodules_cli != RECURSE_SUBMODULES_DEFAULT)
recurse_submodules = recurse_submodules_cli;
if (negotiate_only) {
switch (recurse_submodules_cli) {
case RECURSE_SUBMODULES_OFF:
case RECURSE_SUBMODULES_DEFAULT:
/*
* --negotiate-only should never recurse into
* submodules. Skip it by setting recurse_submodules to
* RECURSE_SUBMODULES_OFF.
*/
recurse_submodules = RECURSE_SUBMODULES_OFF;
break;
default:
die(_("options '%s' and '%s' cannot be used together"),
"--negotiate-only", "--recurse-submodules");
}
}
if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
int *sfjc = submodule_fetch_jobs_config == -1
? &submodule_fetch_jobs_config : NULL;
int *rs = recurse_submodules == RECURSE_SUBMODULES_DEFAULT
? &recurse_submodules : NULL;
fetch_config_from_gitmodules(sfjc, rs);
}
if (negotiate_only && !negotiation_tip.nr)
die(_("--negotiate-only needs one or more --negotiation-tip=*"));
if (deepen_relative) {
if (deepen_relative < 0)
die(_("negative depth in --deepen is not supported"));
if (depth)
die(_("options '%s' and '%s' cannot be used together"), "--deepen", "--depth");
depth = xstrfmt("%d", deepen_relative);
}
if (unshallow) {
if (depth)
die(_("options '%s' and '%s' cannot be used together"), "--depth", "--unshallow");
else if (!is_repository_shallow(the_repository))
die(_("--unshallow on a complete repository does not make sense"));
else
depth = xstrfmt("%d", INFINITE_DEPTH);
}
/* no need to be strict, transport_set_option() will validate it again */
if (depth && atoi(depth) < 1)
die(_("depth %s is not a positive number"), depth);
if (depth || deepen_since || deepen_not.nr)
deepen = 1;
/* FETCH_HEAD never gets updated in --dry-run mode */
if (dry_run)
write_fetch_head = 0;
if (all) {
if (argc == 1)
die(_("fetch --all does not take a repository argument"));
else if (argc > 1)
die(_("fetch --all does not make sense with refspecs"));
(void) for_each_remote(get_one_remote_for_fetch, &list);
} else if (argc == 0) {
/* No arguments -- use default remote */
remote = remote_get(NULL);
} else if (multiple) {
/* All arguments are assumed to be remotes or groups */
for (i = 0; i < argc; i++)
if (!add_remote_or_group(argv[i], &list))
die(_("no such remote or remote group: %s"),
argv[i]);
} else {
/* Single remote or group */
(void) add_remote_or_group(argv[0], &list);
if (list.nr > 1) {
/* More than one remote */
if (argc > 1)
die(_("fetching a group and specifying refspecs does not make sense"));
} else {
/* Zero or one remotes */
remote = remote_get(argv[0]);
prune_tags_ok = (argc == 1);
argc--;
argv++;
}
}
if (negotiate_only) {
struct oidset acked_commits = OIDSET_INIT;
struct oidset_iter iter;
const struct object_id *oid;
if (!remote)
die(_("must supply remote when using --negotiate-only"));
gtransport = prepare_transport(remote, 1);
if (gtransport->smart_options) {
gtransport->smart_options->acked_commits = &acked_commits;
} else {
warning(_("protocol does not support --negotiate-only, exiting"));
result = 1;
goto cleanup;
}
if (server_options.nr)
gtransport->server_options = &server_options;
result = transport_fetch_refs(gtransport, NULL);
oidset_iter_init(&acked_commits, &iter);
while ((oid = oidset_iter_next(&iter)))
printf("%s\n", oid_to_hex(oid));
oidset_clear(&acked_commits);
} else if (remote) {
if (filter_options.choice || has_promisor_remote())
fetch_one_setup_partial(remote);
result = fetch_one(remote, argc, argv, prune_tags_ok, stdin_refspecs);
} else {
int max_children = max_jobs;
if (filter_options.choice)
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"));
if (max_children < 0)
max_children = fetch_parallel_config;
/* TODO should this also die if we have a previous partial-clone? */
result = fetch_multiple(&list, max_children);
}
if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
struct strvec options = STRVEC_INIT;
int max_children = max_jobs;
if (max_children < 0)
max_children = submodule_fetch_jobs_config;
if (max_children < 0)
max_children = fetch_parallel_config;
add_options_to_argv(&options);
result = fetch_submodules(the_repository,
&options,
submodule_prefix,
recurse_submodules,
recurse_submodules_default,
verbosity < 0,
max_children);
strvec_clear(&options);
}
/*
* Skip irrelevant tasks because we know objects were not
* fetched.
*
* NEEDSWORK: as a future optimization, we can return early
* whenever objects were not fetched e.g. if we already have all
* of them.
*/
if (negotiate_only)
goto cleanup;
prepare_repo_settings(the_repository);
if (fetch_write_commit_graph > 0 ||
(fetch_write_commit_graph < 0 &&
the_repository->settings.fetch_write_commit_graph)) {
int commit_graph_flags = COMMIT_GRAPH_WRITE_SPLIT;
if (progress)
commit_graph_flags |= COMMIT_GRAPH_WRITE_PROGRESS;
write_commit_graph_reachable(the_repository->objects->odb,
commit_graph_flags,
NULL);
}
if (enable_auto_gc) {
if (refetch) {
/*
* Hint auto-maintenance strongly to encourage repacking,
* but respect config settings disabling it.
*/
int opt_val;
if (git_config_get_int("gc.autopacklimit", &opt_val))
opt_val = -1;
if (opt_val != 0)
git_config_push_parameter("gc.autoPackLimit=1");
if (git_config_get_int("maintenance.incremental-repack.auto", &opt_val))
opt_val = -1;
if (opt_val != 0)
git_config_push_parameter("maintenance.incremental-repack.auto=-1");
}
run_auto_maintenance(verbosity < 0);
}
cleanup:
string_list_clear(&list, 0);
return result;
}
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