diff options
Diffstat (limited to 'builtin/fetch.c')
| -rw-r--r-- | builtin/fetch.c | 1220 |
1 files changed, 1220 insertions, 0 deletions
diff --git a/builtin/fetch.c b/builtin/fetch.c new file mode 100644 index 0000000000..7b84d35d83 --- /dev/null +++ b/builtin/fetch.c @@ -0,0 +1,1220 @@ +/* + * "git fetch" + */ +#include "cache.h" +#include "refs.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 "transport.h" +#include "submodule.h" +#include "connected.h" +#include "argv-array.h" + +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 prune = -1; /* unspecified */ +#define PRUNE_BY_DEFAULT 0 /* do we prune by default? */ + +static int all, append, dry_run, force, keep, multiple, update_head_ok, verbosity; +static int progress = -1, recurse_submodules = RECURSE_SUBMODULES_DEFAULT; +static int tags = TAGS_DEFAULT, unshallow, update_shallow; +static const char *depth; +static const char *upload_pack; +static struct strbuf default_rla = STRBUF_INIT; +static struct transport *gtransport; +static struct transport *gsecondary; +static const char *submodule_prefix = ""; +static const char *recurse_submodules_default; +static int shown_url = 0; +static int refmap_alloc, refmap_nr; +static const char **refmap_array; + +static int option_parse_recurse_submodules(const struct option *opt, + const char *arg, int unset) +{ + if (unset) { + recurse_submodules = RECURSE_SUBMODULES_OFF; + } else { + if (arg) + recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg); + else + recurse_submodules = RECURSE_SUBMODULES_ON; + } + return 0; +} + +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; + } + return git_default_config(k, v, cb); +} + +static int parse_refmap_arg(const struct option *opt, const char *arg, int unset) +{ + ALLOC_GROW(refmap_array, refmap_nr + 1, refmap_alloc); + + /* + * "git fetch --refmap='' origin foo" + * can be used to tell the command not to store anywhere + */ + if (*arg) + refmap_array[refmap_nr++] = arg; + return 0; +} + +static struct option builtin_fetch_options[] = { + OPT__VERBOSITY(&verbosity), + OPT_BOOL(0, "all", &all, + N_("fetch from all remotes")), + OPT_BOOL('a', "append", &append, + N_("append to .git/FETCH_HEAD instead of overwriting")), + 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 branch")), + 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_BOOL('p', "prune", &prune, + N_("prune remote-tracking branches no longer on remote")), + { OPTION_CALLBACK, 0, "recurse-submodules", NULL, N_("on-demand"), + N_("control recursive fetching of submodules"), + PARSE_OPT_OPTARG, option_parse_recurse_submodules }, + OPT_BOOL(0, "dry-run", &dry_run, + N_("dry run")), + 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")), + { OPTION_SET_INT, 0, "unshallow", &unshallow, NULL, + N_("convert to a complete repository"), + PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1 }, + { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"), + N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN }, + { OPTION_STRING, 0, "recurse-submodules-default", + &recurse_submodules_default, NULL, + N_("default mode for recursion"), PARSE_OPT_HIDDEN }, + OPT_BOOL(0, "update-shallow", &update_shallow, + N_("accept refs that update .git/shallow")), + { OPTION_CALLBACK, 0, "refmap", NULL, N_("refmap"), + N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg }, + OPT_END() +}; + +static void unlock_pack(void) +{ + if (gtransport) + transport_unlock_pack(gtransport); + if (gsecondary) + transport_unlock_pack(gsecondary); +} + +static void unlock_pack_on_signal(int signo) +{ + unlock_pack(); + 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 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 int add_existing(const char *refname, const unsigned char *sha1, + int flag, void *cbdata) +{ + struct string_list *list = (struct string_list *)cbdata; + struct string_list_item *item = string_list_insert(list, refname); + item->util = xmalloc(20); + hashcpy(item->util, sha1); + return 0; +} + +static int will_fetch(struct ref **head, const unsigned char *sha1) +{ + struct ref *rm = *head; + while (rm) { + if (!hashcmp(rm->old_sha1, sha1)) + return 1; + rm = rm->next; + } + return 0; +} + +static void find_non_local_tags(struct transport *transport, + struct ref **head, + struct ref ***tail) +{ + struct string_list existing_refs = STRING_LIST_INIT_DUP; + struct string_list remote_refs = STRING_LIST_INIT_NODUP; + const struct ref *ref; + struct string_list_item *item = NULL; + + for_each_ref(add_existing, &existing_refs); + for (ref = transport_get_remote_refs(transport); 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_sha1_file(ref->old_sha1) && + !will_fetch(head, ref->old_sha1) && + !has_sha1_file(item->util) && + !will_fetch(head, item->util)) + item->util = NULL; + 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_sha1_file(item->util) && + !will_fetch(head, item->util)) + item->util = NULL; + + item = NULL; + + /* skip duplicates and refs that we already have */ + if (string_list_has_string(&remote_refs, ref->name) || + string_list_has_string(&existing_refs, ref->name)) + continue; + + item = string_list_insert(&remote_refs, ref->name); + item->util = (void *)ref->old_sha1; + } + string_list_clear(&existing_refs, 1); + + /* + * We may have a final lightweight tag that needs to be + * checked to see if it needs fetching. + */ + if (item && !has_sha1_file(item->util) && + !will_fetch(head, item->util)) + item->util = NULL; + + /* + * For all the tags in the remote_refs string list, + * add them to the list of refs to be fetched + */ + for_each_string_list_item(item, &remote_refs) { + /* Unless we have already decided to ignore this item... */ + if (item->util) + { + struct ref *rm = alloc_ref(item->string); + rm->peer_ref = alloc_ref(item->string); + hashcpy(rm->old_sha1, item->util); + **tail = rm; + *tail = &rm->next; + } + } + + string_list_clear(&remote_refs, 0); +} + +static struct ref *get_ref_map(struct transport *transport, + struct refspec *refspecs, int refspec_count, + 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; + + const struct ref *remote_refs = transport_get_remote_refs(transport); + + if (refspec_count) { + struct refspec *fetch_refspec; + int fetch_refspec_nr; + + for (i = 0; i < refspec_count; i++) { + get_fetch_map(remote_refs, &refspecs[i], &tail, 0); + if (refspecs[i].dst && refspecs[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_array) { + fetch_refspec = parse_fetch_refspec(refmap_nr, refmap_array); + fetch_refspec_nr = refmap_nr; + } else { + fetch_refspec = transport->remote->fetch; + fetch_refspec_nr = transport->remote->fetch_refspec_nr; + } + + for (i = 0; i < fetch_refspec_nr; i++) + get_fetch_map(ref_map, &fetch_refspec[i], &oref_tail, 1); + + if (tags == TAGS_SET) + get_fetch_map(remote_refs, tag_refspec, &tail, 0); + } else if (refmap_array) { + die("--refmap option is only meaningful with command-line refspec(s)."); + } 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 || + /* Note: has_merge implies non-NULL branch->remote_name */ + (has_merge && !strcmp(branch->remote_name, remote->name)))) { + 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->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 { + 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(transport, &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; + } + + return ref_remove_duplicates(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, + int check_old) +{ + char msg[1024]; + char *rla = getenv("GIT_REFLOG_ACTION"); + struct ref_transaction *transaction; + struct strbuf err = STRBUF_INIT; + int ret, df_conflict = 0; + + if (dry_run) + return 0; + if (!rla) + rla = default_rla.buf; + snprintf(msg, sizeof(msg), "%s: %s", rla, action); + + transaction = ref_transaction_begin(&err); + if (!transaction || + ref_transaction_update(transaction, ref->name, ref->new_sha1, + ref->old_sha1, 0, check_old, msg, &err)) + goto fail; + + ret = ref_transaction_commit(transaction, &err); + if (ret) { + df_conflict = (ret == TRANSACTION_NAME_CONFLICT); + goto fail; + } + + ref_transaction_free(transaction); + strbuf_release(&err); + return 0; +fail: + ref_transaction_free(transaction); + error("%s", err.buf); + strbuf_release(&err); + return df_conflict ? STORE_REF_ERROR_DF_CONFLICT + : STORE_REF_ERROR_OTHER; +} + +#define REFCOL_WIDTH 10 + +static int update_local_ref(struct ref *ref, + const char *remote, + const struct ref *remote_ref, + struct strbuf *display) +{ + struct commit *current = NULL, *updated; + enum object_type type; + struct branch *current_branch = branch_get(NULL); + const char *pretty_ref = prettify_refname(ref->name); + + type = sha1_object_info(ref->new_sha1, NULL); + if (type < 0) + die(_("object %s not found"), sha1_to_hex(ref->new_sha1)); + + if (!hashcmp(ref->old_sha1, ref->new_sha1)) { + if (verbosity > 0) + strbuf_addf(display, "= %-*s %-*s -> %s", + TRANSPORT_SUMMARY(_("[up to date]")), + REFCOL_WIDTH, remote, pretty_ref); + 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... + */ + strbuf_addf(display, + _("! %-*s %-*s -> %s (can't fetch in current branch)"), + TRANSPORT_SUMMARY(_("[rejected]")), + REFCOL_WIDTH, remote, pretty_ref); + return 1; + } + + if (!is_null_sha1(ref->old_sha1) && + starts_with(ref->name, "refs/tags/")) { + int r; + r = s_update_ref("updating tag", ref, 0); + strbuf_addf(display, "%c %-*s %-*s -> %s%s", + r ? '!' : '-', + TRANSPORT_SUMMARY(_("[tag update]")), + REFCOL_WIDTH, remote, pretty_ref, + r ? _(" (unable to update local ref)") : ""); + return r; + } + + current = lookup_commit_reference_gently(ref->old_sha1, 1); + updated = lookup_commit_reference_gently(ref->new_sha1, 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]"); + } + + if ((recurse_submodules != RECURSE_SUBMODULES_OFF) && + (recurse_submodules != RECURSE_SUBMODULES_ON)) + check_for_new_submodule_commits(ref->new_sha1); + r = s_update_ref(msg, ref, 0); + strbuf_addf(display, "%c %-*s %-*s -> %s%s", + r ? '!' : '*', + TRANSPORT_SUMMARY(what), + REFCOL_WIDTH, remote, pretty_ref, + r ? _(" (unable to update local ref)") : ""); + return r; + } + + if (in_merge_bases(current, updated)) { + char quickref[83]; + int r; + strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV)); + strcat(quickref, ".."); + strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV)); + if ((recurse_submodules != RECURSE_SUBMODULES_OFF) && + (recurse_submodules != RECURSE_SUBMODULES_ON)) + check_for_new_submodule_commits(ref->new_sha1); + r = s_update_ref("fast-forward", ref, 1); + strbuf_addf(display, "%c %-*s %-*s -> %s%s", + r ? '!' : ' ', + TRANSPORT_SUMMARY_WIDTH, quickref, + REFCOL_WIDTH, remote, pretty_ref, + r ? _(" (unable to update local ref)") : ""); + return r; + } else if (force || ref->force) { + char quickref[84]; + int r; + strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV)); + strcat(quickref, "..."); + strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV)); + if ((recurse_submodules != RECURSE_SUBMODULES_OFF) && + (recurse_submodules != RECURSE_SUBMODULES_ON)) + check_for_new_submodule_commits(ref->new_sha1); + r = s_update_ref("forced-update", ref, 1); + strbuf_addf(display, "%c %-*s %-*s -> %s (%s)", + r ? '!' : '+', + TRANSPORT_SUMMARY_WIDTH, quickref, + REFCOL_WIDTH, remote, pretty_ref, + r ? _("unable to update local ref") : _("forced update")); + return r; + } else { + strbuf_addf(display, "! %-*s %-*s -> %s %s", + TRANSPORT_SUMMARY(_("[rejected]")), + REFCOL_WIDTH, remote, pretty_ref, + _("(non-fast-forward)")); + return 1; + } +} + +static int iterate_ref_map(void *cb_data, unsigned char sha1[20]) +{ + struct ref **rm = cb_data; + struct ref *ref = *rm; + + while (ref && ref->status == REF_STATUS_REJECT_SHALLOW) + ref = ref->next; + if (!ref) + return -1; /* end of the list */ + *rm = ref->next; + hashcpy(sha1, ref->old_sha1); + return 0; +} + +static int store_updated_refs(const char *raw_url, const char *remote_name, + struct ref *ref_map) +{ + FILE *fp; + struct commit *commit; + int url_len, i, rc = 0; + struct strbuf note = STRBUF_INIT; + const char *what, *kind; + struct ref *rm; + char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD"); + int want_status; + + fp = fopen(filename, "a"); + if (!fp) + return error(_("cannot open %s: %s\n"), filename, strerror(errno)); + + if (raw_url) + url = transport_anonymize_url(raw_url); + else + url = xstrdup("foreign"); + + rm = ref_map; + if (check_everything_connected(iterate_ref_map, 0, &rm)) { + rc = error(_("%s did not send all necessary objects\n"), url); + goto abort; + } + + /* + * 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; + const char *merge_status_marker = ""; + + if (rm->status == REF_STATUS_REJECT_SHALLOW) { + if (want_status == FETCH_HEAD_MERGE) + warning(_("reject %s because shallow roots are not allowed to be updated"), + rm->peer_ref ? rm->peer_ref->name : rm->name); + continue; + } + + commit = lookup_commit_reference_gently(rm->old_sha1, 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 = 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; + } + + + if (!strcmp(rm->name, "HEAD")) { + kind = ""; + what = ""; + } + else if (starts_with(rm->name, "refs/heads/")) { + kind = "branch"; + what = rm->name + 11; + } + else if (starts_with(rm->name, "refs/tags/")) { + kind = "tag"; + what = rm->name + 10; + } + else if (starts_with(rm->name, "refs/remotes/")) { + kind = "remote-tracking 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; + + strbuf_reset(¬e); + if (*what) { + if (*kind) + strbuf_addf(¬e, "%s ", kind); + strbuf_addf(¬e, "'%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", + sha1_to_hex(rm->old_sha1), + 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; + } + + strbuf_reset(¬e); + if (ref) { + rc |= update_local_ref(ref, what, rm, ¬e); + free(ref); + } else + strbuf_addf(¬e, "* %-*s %-*s -> FETCH_HEAD", + TRANSPORT_SUMMARY_WIDTH, + *kind ? kind : "branch", + REFCOL_WIDTH, + *what ? what : "HEAD"); + if (note.len) { + if (verbosity >= 0 && !shown_url) { + fprintf(stderr, _("From %.*s\n"), + url_len, url); + shown_url = 1; + } + if (verbosity >= 0) + 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); + + abort: + strbuf_release(¬e); + free(url); + fclose(fp); + 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 quickfetch(struct ref *ref_map) +{ + struct ref *rm = ref_map; + + /* + * 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 (depth) + return -1; + return check_everything_connected(iterate_ref_map, 1, &rm); +} + +static int fetch_refs(struct transport *transport, struct ref *ref_map) +{ + int ret = quickfetch(ref_map); + if (ret) + ret = transport_fetch_refs(transport, ref_map); + if (!ret) + ret |= store_updated_refs(transport->url, + transport->remote->name, + ref_map); + transport_unlock_pack(transport); + return ret; +} + +static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map, + const char *raw_url) +{ + int url_len, i, result = 0; + struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map); + 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; + + for (ref = stale_refs; ref; ref = ref->next) { + if (!dry_run) + result |= delete_ref(ref->name, NULL, 0); + if (verbosity >= 0 && !shown_url) { + fprintf(stderr, _("From %.*s\n"), url_len, url); + shown_url = 1; + } + if (verbosity >= 0) { + fprintf(stderr, " x %-*s %-*s -> %s\n", + TRANSPORT_SUMMARY(_("[deleted]")), + REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name)); + warn_dangling_symref(stderr, dangling_msg, ref->name); + } + } + free(url); + free_refs(stale_refs); + return result; +} + +static void check_not_current_branch(struct ref *ref_map) +{ + struct branch *current_branch = branch_get(NULL); + + if (is_bare_repository() || !current_branch) + return; + + for (; ref_map; ref_map = ref_map->next) + if (ref_map->peer_ref && !strcmp(current_branch->refname, + ref_map->peer_ref->name)) + die(_("Refusing to fetch into current branch %s " + "of non-bare repository"), current_branch->refname); +} + +static int truncate_fetch_head(void) +{ + char *filename = git_path("FETCH_HEAD"); + FILE *fp = fopen(filename, "w"); + + if (!fp) + return error(_("cannot open %s: %s\n"), filename, strerror(errno)); + 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 struct transport *prepare_transport(struct remote *remote) +{ + struct transport *transport; + transport = transport_get(remote, NULL); + transport_set_verbosity(transport, verbosity, progress); + 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 (update_shallow) + set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes"); + return transport; +} + +static void backfill_tags(struct transport *transport, struct ref *ref_map) +{ + if (transport->cannot_reuse) { + gsecondary = prepare_transport(transport->remote); + transport = gsecondary; + } + + transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL); + transport_set_option(transport, TRANS_OPT_DEPTH, "0"); + fetch_refs(transport, ref_map); + + if (gsecondary) { + transport_disconnect(gsecondary); + gsecondary = NULL; + } +} + +static int do_fetch(struct transport *transport, + struct refspec *refs, int ref_count) +{ + struct string_list existing_refs = STRING_LIST_INIT_DUP; + struct ref *ref_map; + struct ref *rm; + int autotags = (transport->remote->fetch_tags == 1); + int retcode = 0; + + for_each_ref(add_existing, &existing_refs); + + if (tags == TAGS_DEFAULT) { + if (transport->remote->fetch_tags == 2) + tags = TAGS_SET; + if (transport->remote->fetch_tags == -1) + tags = TAGS_UNSET; + } + + 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 && !dry_run) { + retcode = truncate_fetch_head(); + if (retcode) + goto cleanup; + } + + ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags); + if (!update_head_ok) + check_not_current_branch(ref_map); + + for (rm = ref_map; rm; rm = rm->next) { + if (rm->peer_ref) { + struct string_list_item *peer_item = + string_list_lookup(&existing_refs, + rm->peer_ref->name); + if (peer_item) + hashcpy(rm->peer_ref->old_sha1, + peer_item->util); + } + } + + 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 (ref_count) { + prune_refs(refs, ref_count, ref_map, transport->url); + } else { + prune_refs(transport->remote->fetch, + transport->remote->fetch_refspec_nr, + ref_map, + transport->url); + } + } + if (fetch_refs(transport, ref_map)) { + free_refs(ref_map); + retcode = 1; + goto cleanup; + } + free_refs(ref_map); + + /* if neither --no-tags nor --tags was specified, do automated tag + * following ... */ + if (tags == TAGS_DEFAULT && autotags) { + struct ref **tail = &ref_map; + ref_map = NULL; + find_non_local_tags(transport, &ref_map, &tail); + if (ref_map) + backfill_tags(transport, ref_map); + free_refs(ref_map); + } + + cleanup: + string_list_clear(&existing_refs, 1); + 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 (starts_with(key, "remotes.") && + !strcmp(key + 8, g->name)) { + /* split list by white space */ + int space = strcspn(value, " \t\n"); + while (*value) { + if (space > 1) { + string_list_append(g->list, + xstrndup(value, space)); + } + value += space + (value[space] != '\0'); + space = strcspn(value, " \t\n"); + } + } + + 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; + if (!remote_is_configured(name)) + return 0; + remote = remote_get(name); + string_list_append(list, remote->name); + } + return 1; +} + +static void add_options_to_argv(struct argv_array *argv) +{ + if (dry_run) + argv_array_push(argv, "--dry-run"); + if (prune != -1) + argv_array_push(argv, prune ? "--prune" : "--no-prune"); + if (update_head_ok) + argv_array_push(argv, "--update-head-ok"); + if (force) + argv_array_push(argv, "--force"); + if (keep) + argv_array_push(argv, "--keep"); + if (recurse_submodules == RECURSE_SUBMODULES_ON) + argv_array_push(argv, "--recurse-submodules"); + else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) + argv_array_push(argv, "--recurse-submodules=on-demand"); + if (tags == TAGS_SET) + argv_array_push(argv, "--tags"); + else if (tags == TAGS_UNSET) + argv_array_push(argv, "--no-tags"); + if (verbosity >= 2) + argv_array_push(argv, "-v"); + if (verbosity >= 1) + argv_array_push(argv, "-v"); + else if (verbosity < 0) + argv_array_push(argv, "-q"); + +} + +static int fetch_multiple(struct string_list *list) +{ + int i, result = 0; + struct argv_array argv = ARGV_ARRAY_INIT; + + if (!append && !dry_run) { + int errcode = truncate_fetch_head(); + if (errcode) + return errcode; + } + + argv_array_pushl(&argv, "fetch", "--append", NULL); + add_options_to_argv(&argv); + + for (i = 0; i < list->nr; i++) { + const char *name = list->items[i].string; + argv_array_push(&argv, name); + if (verbosity >= 0) + printf(_("Fetching %s\n"), name); + if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) { + error(_("Could not fetch %s"), name); + result = 1; + } + argv_array_pop(&argv); + } + + argv_array_clear(&argv); + return result; +} + +static int fetch_one(struct remote *remote, int argc, const char **argv) +{ + static const char **refs = NULL; + struct refspec *refspec; + int ref_nr = 0; + int exit_code; + + 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); + + if (prune < 0) { + /* no command line request */ + if (0 <= gtransport->remote->prune) + prune = gtransport->remote->prune; + else if (0 <= fetch_prune_config) + prune = fetch_prune_config; + else + prune = PRUNE_BY_DEFAULT; + } + + if (argc > 0) { + int j = 0; + int i; + refs = xcalloc(argc + 1, sizeof(const char *)); + for (i = 0; i < argc; i++) { + if (!strcmp(argv[i], "tag")) { + i++; + if (i >= argc) + die(_("You need to specify a tag name.")); + refs[j++] = xstrfmt("refs/tags/%s:refs/tags/%s", + argv[i], argv[i]); + } else + refs[j++] = argv[i]; + } + refs[j] = NULL; + ref_nr = j; + } + + sigchain_push_common(unlock_pack_on_signal); + atexit(unlock_pack); + refspec = parse_fetch_refspec(ref_nr, refs); + exit_code = do_fetch(gtransport, refspec, ref_nr); + free_refspec(ref_nr, refspec); + 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_NODUP; + struct remote *remote; + int result = 0; + struct argv_array argv_gc_auto = ARGV_ARRAY_INIT; + + packet_trace_identity("fetch"); + + /* Record the command line for the reflog */ + strbuf_addstr(&default_rla, "fetch"); + for (i = 1; i < argc; i++) + strbuf_addf(&default_rla, " %s", argv[i]); + + git_config(git_fetch_config, NULL); + + argc = parse_options(argc, argv, prefix, + builtin_fetch_options, builtin_fetch_usage, 0); + + if (unshallow) { + if (depth) + die(_("--depth and --unshallow cannot be used together")); + else if (!is_repository_shallow()) + die(_("--unshallow on a complete repository does not make sense")); + else { + static char inf_depth[12]; + sprintf(inf_depth, "%d", INFINITE_DEPTH); + depth = inf_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 (recurse_submodules != RECURSE_SUBMODULES_OFF) { + if (recurse_submodules_default) { + int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default); + set_config_fetch_recurse_submodules(arg); + } + gitmodules_config(); + git_config(submodule_config, NULL); + } + + 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); + result = fetch_multiple(&list); + } else if (argc == 0) { + /* No arguments -- use default remote */ + remote = remote_get(NULL); + result = fetch_one(remote, argc, argv); + } 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]); + result = fetch_multiple(&list); + } 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")); + result = fetch_multiple(&list); + } else { + /* Zero or one remotes */ + remote = remote_get(argv[0]); + result = fetch_one(remote, argc-1, argv+1); + } + } + + if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) { + struct argv_array options = ARGV_ARRAY_INIT; + + add_options_to_argv(&options); + result = fetch_populated_submodules(&options, + submodule_prefix, + recurse_submodules, + verbosity < 0); + argv_array_clear(&options); + } + + /* All names were strdup()ed or strndup()ed */ + list.strdup_strings = 1; + string_list_clear(&list, 0); + + argv_array_pushl(&argv_gc_auto, "gc", "--auto", NULL); + if (verbosity < 0) + argv_array_push(&argv_gc_auto, "--quiet"); + run_command_v_opt(argv_gc_auto.argv, RUN_GIT_CMD); + argv_array_clear(&argv_gc_auto); + + return result; +} |