git/builtin-fetch.c
Junio C Hamano 9ad7c5ae8a git-fetch: do not fail when remote branch disappears
When the branch named with branch.$name.merge is not covered by
the fetch configuration for the remote repository named with
branch.$name.remote, we automatically add that branch to the set
of branches to be fetched.  However, if the remote repository
does not have that branch (e.g. it used to exist, but got
removed), this is not a reason to fail the git-fetch itself.

The situation however will be noticed if git-fetch was called by
git-pull, as the resulting FETCH_HEAD would not have any entry
that is marked for merging.

Acked-By: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2007-10-28 14:06:39 -07:00

586 lines
14 KiB
C

/*
* "git fetch"
*/
#include "cache.h"
#include "refs.h"
#include "commit.h"
#include "builtin.h"
#include "path-list.h"
#include "remote.h"
#include "transport.h"
static const char fetch_usage[] = "git-fetch [-a | --append] [--upload-pack <upload-pack>] [-f | --force] [--no-tags] [-t | --tags] [-k | --keep] [-u | --update-head-ok] [--depth <depth>] [-v | --verbose] [<repository> <refspec>...]";
static int append, force, tags, no_tags, update_head_ok, verbose, quiet;
static char *default_rla = NULL;
static struct transport *transport;
static void unlock_pack(void)
{
if (transport)
transport_unlock_pack(transport);
}
static void unlock_pack_on_signal(int signo)
{
unlock_pack();
signal(SIGINT, SIG_DFL);
raise(signo);
}
static void add_merge_config(struct ref **head,
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 refspec;
for (rm = *head; rm; rm = rm->next) {
if (branch_merge_matches(branch, i, rm->name)) {
rm->merge = 1;
break;
}
}
if (rm)
continue;
/*
* Not fetched to a 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.
*/
refspec.src = branch->merge[i]->src;
refspec.dst = NULL;
refspec.pattern = 0;
refspec.force = 0;
get_fetch_map(remote_refs, &refspec, tail, 1);
for (rm = *old_tail; rm; rm = rm->next)
rm->merge = 1;
}
}
static struct ref *get_ref_map(struct transport *transport,
struct refspec *refs, int ref_count, int tags,
int *autotags)
{
int i;
struct ref *rm;
struct ref *ref_map = NULL;
struct ref **tail = &ref_map;
struct ref *remote_refs = transport_get_remote_refs(transport);
if (ref_count || tags) {
for (i = 0; i < ref_count; i++) {
get_fetch_map(remote_refs, &refs[i], &tail, 0);
if (refs[i].dst && refs[i].dst[0])
*autotags = 1;
}
/* Merge everything on the command line, but not --tags */
for (rm = ref_map; rm; rm = rm->next)
rm->merge = 1;
if (tags) {
struct refspec refspec;
refspec.src = "refs/tags/";
refspec.dst = "refs/tags/";
refspec.pattern = 1;
refspec.force = 0;
get_fetch_map(remote_refs, &refspec, &tail, 0);
}
} else {
/* Use the defaults */
struct remote *remote = transport->remote;
struct branch *branch = branch_get(NULL);
int has_merge = branch_has_merge_config(branch);
if (remote && (remote->fetch_refspec_nr || has_merge)) {
for (i = 0; i < remote->fetch_refspec_nr; i++) {
get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
if (remote->fetch[i].dst &&
remote->fetch[i].dst[0])
*autotags = 1;
if (!i && !has_merge && ref_map &&
!remote->fetch[0].pattern)
ref_map->merge = 1;
}
/*
* 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.
*/
if (has_merge &&
!strcmp(branch->remote_name, remote->name))
add_merge_config(&ref_map, remote_refs, branch, &tail);
} else {
ref_map = get_remote_ref(remote_refs, "HEAD");
if (!ref_map)
die("Couldn't find remote ref HEAD");
ref_map->merge = 1;
}
}
ref_remove_duplicates(ref_map);
return ref_map;
}
static void show_new(enum object_type type, unsigned char *sha1_new)
{
fprintf(stderr, " %s: %s\n", typename(type),
find_unique_abbrev(sha1_new, DEFAULT_ABBREV));
}
static int s_update_ref(const char *action,
struct ref *ref,
int check_old)
{
char msg[1024];
char *rla = getenv("GIT_REFLOG_ACTION");
static struct ref_lock *lock;
if (!rla)
rla = default_rla;
snprintf(msg, sizeof(msg), "%s: %s", rla, action);
lock = lock_any_ref_for_update(ref->name,
check_old ? ref->old_sha1 : NULL, 0);
if (!lock)
return 1;
if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
return 1;
return 0;
}
static int update_local_ref(struct ref *ref,
const char *note,
int verbose)
{
char oldh[41], newh[41];
struct commit *current = NULL, *updated;
enum object_type type;
struct branch *current_branch = branch_get(NULL);
type = sha1_object_info(ref->new_sha1, NULL);
if (type < 0)
die("object %s not found", sha1_to_hex(ref->new_sha1));
if (!*ref->name) {
/* Not storing */
if (verbose) {
fprintf(stderr, "* fetched %s\n", note);
show_new(type, ref->new_sha1);
}
return 0;
}
if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
if (verbose) {
fprintf(stderr, "* %s: same as %s\n",
ref->name, note);
show_new(type, ref->new_sha1);
}
return 0;
}
if (current_branch &&
!strcmp(ref->name, current_branch->name) &&
!(update_head_ok || is_bare_repository()) &&
!is_null_sha1(ref->old_sha1)) {
/*
* If this is the head, and it's not okay to update
* the head, and the old value of the head isn't empty...
*/
fprintf(stderr,
" * %s: Cannot fetch into the current branch.\n",
ref->name);
return 1;
}
if (!is_null_sha1(ref->old_sha1) &&
!prefixcmp(ref->name, "refs/tags/")) {
fprintf(stderr, "* %s: updating with %s\n",
ref->name, note);
show_new(type, ref->new_sha1);
return s_update_ref("updating tag", ref, 0);
}
current = lookup_commit_reference_gently(ref->old_sha1, 1);
updated = lookup_commit_reference_gently(ref->new_sha1, 1);
if (!current || !updated) {
char *msg;
if (!strncmp(ref->name, "refs/tags/", 10))
msg = "storing tag";
else
msg = "storing head";
fprintf(stderr, "* %s: storing %s\n",
ref->name, note);
show_new(type, ref->new_sha1);
return s_update_ref(msg, ref, 0);
}
strcpy(oldh, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
strcpy(newh, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
if (in_merge_bases(current, &updated, 1)) {
fprintf(stderr, "* %s: fast forward to %s\n",
ref->name, note);
fprintf(stderr, " old..new: %s..%s\n", oldh, newh);
return s_update_ref("fast forward", ref, 1);
}
if (!force && !ref->force) {
fprintf(stderr,
"* %s: not updating to non-fast forward %s\n",
ref->name, note);
fprintf(stderr,
" old...new: %s...%s\n", oldh, newh);
return 1;
}
fprintf(stderr,
"* %s: forcing update to non-fast forward %s\n",
ref->name, note);
fprintf(stderr, " old...new: %s...%s\n", oldh, newh);
return s_update_ref("forced-update", ref, 1);
}
static void store_updated_refs(const char *url, struct ref *ref_map)
{
FILE *fp;
struct commit *commit;
int url_len, i, note_len;
char note[1024];
const char *what, *kind;
struct ref *rm;
fp = fopen(git_path("FETCH_HEAD"), "a");
for (rm = ref_map; rm; rm = rm->next) {
struct ref *ref = NULL;
if (rm->peer_ref) {
ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
strcpy(ref->name, rm->peer_ref->name);
hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
hashcpy(ref->new_sha1, rm->old_sha1);
ref->force = rm->peer_ref->force;
}
commit = lookup_commit_reference_gently(rm->old_sha1, 1);
if (!commit)
rm->merge = 0;
if (!strcmp(rm->name, "HEAD")) {
kind = "";
what = "";
}
else if (!prefixcmp(rm->name, "refs/heads/")) {
kind = "branch";
what = rm->name + 11;
}
else if (!prefixcmp(rm->name, "refs/tags/")) {
kind = "tag";
what = rm->name + 10;
}
else if (!prefixcmp(rm->name, "refs/remotes/")) {
kind = "remote branch";
what = rm->name + 13;
}
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;
note_len = 0;
if (*what) {
if (*kind)
note_len += sprintf(note + note_len, "%s ",
kind);
note_len += sprintf(note + note_len, "'%s' of ", what);
}
note_len += sprintf(note + note_len, "%.*s", url_len, url);
fprintf(fp, "%s\t%s\t%s\n",
sha1_to_hex(commit ? commit->object.sha1 :
rm->old_sha1),
rm->merge ? "" : "not-for-merge",
note);
if (ref)
update_local_ref(ref, note, verbose);
}
fclose(fp);
}
static int fetch_refs(struct transport *transport, struct ref *ref_map)
{
int ret = transport_fetch_refs(transport, ref_map);
if (!ret)
store_updated_refs(transport->url, ref_map);
transport_unlock_pack(transport);
return ret;
}
static int add_existing(const char *refname, const unsigned char *sha1,
int flag, void *cbdata)
{
struct path_list *list = (struct path_list *)cbdata;
path_list_insert(refname, list);
return 0;
}
static struct ref *find_non_local_tags(struct transport *transport,
struct ref *fetch_map)
{
static struct path_list existing_refs = { NULL, 0, 0, 0 };
struct path_list new_refs = { NULL, 0, 0, 1 };
char *ref_name;
int ref_name_len;
unsigned char *ref_sha1;
struct ref *tag_ref;
struct ref *rm = NULL;
struct ref *ref_map = NULL;
struct ref **tail = &ref_map;
struct ref *ref;
for_each_ref(add_existing, &existing_refs);
for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
if (prefixcmp(ref->name, "refs/tags"))
continue;
ref_name = xstrdup(ref->name);
ref_name_len = strlen(ref_name);
ref_sha1 = ref->old_sha1;
if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
ref_name[ref_name_len - 3] = 0;
tag_ref = transport_get_remote_refs(transport);
while (tag_ref) {
if (!strcmp(tag_ref->name, ref_name)) {
ref_sha1 = tag_ref->old_sha1;
break;
}
tag_ref = tag_ref->next;
}
}
if (!path_list_has_path(&existing_refs, ref_name) &&
!path_list_has_path(&new_refs, ref_name) &&
lookup_object(ref->old_sha1)) {
fprintf(stderr, "Auto-following %s\n",
ref_name);
path_list_insert(ref_name, &new_refs);
rm = alloc_ref(strlen(ref_name) + 1);
strcpy(rm->name, ref_name);
rm->peer_ref = alloc_ref(strlen(ref_name) + 1);
strcpy(rm->peer_ref->name, ref_name);
hashcpy(rm->old_sha1, ref_sha1);
*tail = rm;
tail = &rm->next;
}
free(ref_name);
}
return ref_map;
}
static int do_fetch(struct transport *transport,
struct refspec *refs, int ref_count)
{
struct ref *ref_map, *fetch_map;
struct ref *rm;
int autotags = (transport->remote->fetch_tags == 1);
if (transport->remote->fetch_tags == 2 && !no_tags)
tags = 1;
if (transport->remote->fetch_tags == -1)
no_tags = 1;
if (!transport->get_refs_list || !transport->fetch)
die("Don't know how to fetch from %s", transport->url);
/* if not appending, truncate FETCH_HEAD */
if (!append)
fclose(fopen(git_path("FETCH_HEAD"), "w"));
ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
for (rm = ref_map; rm; rm = rm->next) {
if (rm->peer_ref)
read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
}
if (fetch_refs(transport, ref_map)) {
free_refs(ref_map);
return 1;
}
fetch_map = ref_map;
/* if neither --no-tags nor --tags was specified, do automated tag
* following ... */
if (!(tags || no_tags) && autotags) {
ref_map = find_non_local_tags(transport, fetch_map);
if (ref_map) {
transport_set_option(transport, TRANS_OPT_DEPTH, "0");
fetch_refs(transport, ref_map);
}
free_refs(ref_map);
}
free_refs(fetch_map);
return 0;
}
static void set_option(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\n",
name, value, transport->url);
if (r > 0)
warning("Option \"%s\" is ignored for %s\n",
name, transport->url);
}
int cmd_fetch(int argc, const char **argv, const char *prefix)
{
struct remote *remote;
int i, j, rla_offset;
static const char **refs = NULL;
int ref_nr = 0;
int cmd_len = 0;
const char *depth = NULL, *upload_pack = NULL;
int keep = 0;
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
cmd_len += strlen(arg);
if (arg[0] != '-')
break;
if (!strcmp(arg, "--append") || !strcmp(arg, "-a")) {
append = 1;
continue;
}
if (!prefixcmp(arg, "--upload-pack=")) {
upload_pack = arg + 14;
continue;
}
if (!strcmp(arg, "--upload-pack")) {
i++;
if (i == argc)
usage(fetch_usage);
upload_pack = argv[i];
continue;
}
if (!strcmp(arg, "--force") || !strcmp(arg, "-f")) {
force = 1;
continue;
}
if (!strcmp(arg, "--no-tags")) {
no_tags = 1;
continue;
}
if (!strcmp(arg, "--tags") || !strcmp(arg, "-t")) {
tags = 1;
continue;
}
if (!strcmp(arg, "--keep") || !strcmp(arg, "-k")) {
keep = 1;
continue;
}
if (!strcmp(arg, "--update-head-ok") || !strcmp(arg, "-u")) {
update_head_ok = 1;
continue;
}
if (!prefixcmp(arg, "--depth=")) {
depth = arg + 8;
continue;
}
if (!strcmp(arg, "--depth")) {
i++;
if (i == argc)
usage(fetch_usage);
depth = argv[i];
continue;
}
if (!strcmp(arg, "--quiet")) {
quiet = 1;
continue;
}
if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
verbose++;
continue;
}
usage(fetch_usage);
}
for (j = i; j < argc; j++)
cmd_len += strlen(argv[j]);
default_rla = xmalloc(cmd_len + 5 + argc + 1);
sprintf(default_rla, "fetch");
rla_offset = strlen(default_rla);
for (j = 1; j < argc; j++) {
sprintf(default_rla + rla_offset, " %s", argv[j]);
rla_offset += strlen(argv[j]) + 1;
}
if (i == argc)
remote = remote_get(NULL);
else
remote = remote_get(argv[i++]);
transport = transport_get(remote, remote->url[0]);
if (verbose >= 2)
transport->verbose = 1;
if (quiet)
transport->verbose = -1;
if (upload_pack)
set_option(TRANS_OPT_UPLOADPACK, upload_pack);
if (keep)
set_option(TRANS_OPT_KEEP, "yes");
if (depth)
set_option(TRANS_OPT_DEPTH, depth);
if (!transport->url)
die("Where do you want to fetch from today?");
if (i < argc) {
int j = 0;
refs = xcalloc(argc - i + 1, sizeof(const char *));
while (i < argc) {
if (!strcmp(argv[i], "tag")) {
char *ref;
i++;
ref = xmalloc(strlen(argv[i]) * 2 + 22);
strcpy(ref, "refs/tags/");
strcat(ref, argv[i]);
strcat(ref, ":refs/tags/");
strcat(ref, argv[i]);
refs[j++] = ref;
} else
refs[j++] = argv[i];
i++;
}
refs[j] = NULL;
ref_nr = j;
}
signal(SIGINT, unlock_pack_on_signal);
atexit(unlock_pack);
return do_fetch(transport, parse_ref_spec(ref_nr, refs), ref_nr);
}