diff options
Diffstat (limited to 'remote.c')
| -rw-r--r-- | remote.c | 1728 |
1 files changed, 1728 insertions, 0 deletions
diff --git a/remote.c b/remote.c new file mode 100644 index 0000000000..6ececc4a77 --- /dev/null +++ b/remote.c @@ -0,0 +1,1728 @@ +#include "cache.h" +#include "remote.h" +#include "refs.h" +#include "commit.h" +#include "diff.h" +#include "revision.h" +#include "dir.h" +#include "tag.h" +#include "string-list.h" + +static struct refspec s_tag_refspec = { + 0, + 1, + 0, + "refs/tags/*", + "refs/tags/*" +}; + +const struct refspec *tag_refspec = &s_tag_refspec; + +struct counted_string { + size_t len; + const char *s; +}; +struct rewrite { + const char *base; + size_t baselen; + struct counted_string *instead_of; + int instead_of_nr; + int instead_of_alloc; +}; +struct rewrites { + struct rewrite **rewrite; + int rewrite_alloc; + int rewrite_nr; +}; + +static struct remote **remotes; +static int remotes_alloc; +static int remotes_nr; + +static struct branch **branches; +static int branches_alloc; +static int branches_nr; + +static struct branch *current_branch; +static const char *default_remote_name; +static int explicit_default_remote_name; + +static struct rewrites rewrites; +static struct rewrites rewrites_push; + +#define BUF_SIZE (2048) +static char buffer[BUF_SIZE]; + +static int valid_remote(const struct remote *remote) +{ + return (!!remote->url) || (!!remote->foreign_vcs); +} + +static const char *alias_url(const char *url, struct rewrites *r) +{ + int i, j; + char *ret; + struct counted_string *longest; + int longest_i; + + longest = NULL; + longest_i = -1; + for (i = 0; i < r->rewrite_nr; i++) { + if (!r->rewrite[i]) + continue; + for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) { + if (!prefixcmp(url, r->rewrite[i]->instead_of[j].s) && + (!longest || + longest->len < r->rewrite[i]->instead_of[j].len)) { + longest = &(r->rewrite[i]->instead_of[j]); + longest_i = i; + } + } + } + if (!longest) + return url; + + ret = xmalloc(r->rewrite[longest_i]->baselen + + (strlen(url) - longest->len) + 1); + strcpy(ret, r->rewrite[longest_i]->base); + strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len); + return ret; +} + +static void add_push_refspec(struct remote *remote, const char *ref) +{ + ALLOC_GROW(remote->push_refspec, + remote->push_refspec_nr + 1, + remote->push_refspec_alloc); + remote->push_refspec[remote->push_refspec_nr++] = ref; +} + +static void add_fetch_refspec(struct remote *remote, const char *ref) +{ + ALLOC_GROW(remote->fetch_refspec, + remote->fetch_refspec_nr + 1, + remote->fetch_refspec_alloc); + remote->fetch_refspec[remote->fetch_refspec_nr++] = ref; +} + +static void add_url(struct remote *remote, const char *url) +{ + ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc); + remote->url[remote->url_nr++] = url; +} + +static void add_pushurl(struct remote *remote, const char *pushurl) +{ + ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc); + remote->pushurl[remote->pushurl_nr++] = pushurl; +} + +static void add_pushurl_alias(struct remote *remote, const char *url) +{ + const char *pushurl = alias_url(url, &rewrites_push); + if (pushurl != url) + add_pushurl(remote, pushurl); +} + +static void add_url_alias(struct remote *remote, const char *url) +{ + add_url(remote, alias_url(url, &rewrites)); + add_pushurl_alias(remote, url); +} + +static struct remote *make_remote(const char *name, int len) +{ + struct remote *ret; + int i; + + for (i = 0; i < remotes_nr; i++) { + if (len ? (!strncmp(name, remotes[i]->name, len) && + !remotes[i]->name[len]) : + !strcmp(name, remotes[i]->name)) + return remotes[i]; + } + + ret = xcalloc(1, sizeof(struct remote)); + ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc); + remotes[remotes_nr++] = ret; + if (len) + ret->name = xstrndup(name, len); + else + ret->name = xstrdup(name); + return ret; +} + +static void add_merge(struct branch *branch, const char *name) +{ + ALLOC_GROW(branch->merge_name, branch->merge_nr + 1, + branch->merge_alloc); + branch->merge_name[branch->merge_nr++] = name; +} + +static struct branch *make_branch(const char *name, int len) +{ + struct branch *ret; + int i; + char *refname; + + for (i = 0; i < branches_nr; i++) { + if (len ? (!strncmp(name, branches[i]->name, len) && + !branches[i]->name[len]) : + !strcmp(name, branches[i]->name)) + return branches[i]; + } + + ALLOC_GROW(branches, branches_nr + 1, branches_alloc); + ret = xcalloc(1, sizeof(struct branch)); + branches[branches_nr++] = ret; + if (len) + ret->name = xstrndup(name, len); + else + ret->name = xstrdup(name); + refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1); + strcpy(refname, "refs/heads/"); + strcpy(refname + strlen("refs/heads/"), ret->name); + ret->refname = refname; + + return ret; +} + +static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len) +{ + struct rewrite *ret; + int i; + + for (i = 0; i < r->rewrite_nr; i++) { + if (len + ? (len == r->rewrite[i]->baselen && + !strncmp(base, r->rewrite[i]->base, len)) + : !strcmp(base, r->rewrite[i]->base)) + return r->rewrite[i]; + } + + ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc); + ret = xcalloc(1, sizeof(struct rewrite)); + r->rewrite[r->rewrite_nr++] = ret; + if (len) { + ret->base = xstrndup(base, len); + ret->baselen = len; + } + else { + ret->base = xstrdup(base); + ret->baselen = strlen(base); + } + return ret; +} + +static void add_instead_of(struct rewrite *rewrite, const char *instead_of) +{ + ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc); + rewrite->instead_of[rewrite->instead_of_nr].s = instead_of; + rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of); + rewrite->instead_of_nr++; +} + +static void read_remotes_file(struct remote *remote) +{ + FILE *f = fopen(git_path("remotes/%s", remote->name), "r"); + + if (!f) + return; + remote->origin = REMOTE_REMOTES; + while (fgets(buffer, BUF_SIZE, f)) { + int value_list; + char *s, *p; + + if (!prefixcmp(buffer, "URL:")) { + value_list = 0; + s = buffer + 4; + } else if (!prefixcmp(buffer, "Push:")) { + value_list = 1; + s = buffer + 5; + } else if (!prefixcmp(buffer, "Pull:")) { + value_list = 2; + s = buffer + 5; + } else + continue; + + while (isspace(*s)) + s++; + if (!*s) + continue; + + p = s + strlen(s); + while (isspace(p[-1])) + *--p = 0; + + switch (value_list) { + case 0: + add_url_alias(remote, xstrdup(s)); + break; + case 1: + add_push_refspec(remote, xstrdup(s)); + break; + case 2: + add_fetch_refspec(remote, xstrdup(s)); + break; + } + } + fclose(f); +} + +static void read_branches_file(struct remote *remote) +{ + const char *slash = strchr(remote->name, '/'); + char *frag; + struct strbuf branch = STRBUF_INIT; + int n = slash ? slash - remote->name : 1000; + FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r"); + char *s, *p; + int len; + + if (!f) + return; + s = fgets(buffer, BUF_SIZE, f); + fclose(f); + if (!s) + return; + while (isspace(*s)) + s++; + if (!*s) + return; + remote->origin = REMOTE_BRANCHES; + p = s + strlen(s); + while (isspace(p[-1])) + *--p = 0; + len = p - s; + if (slash) + len += strlen(slash); + p = xmalloc(len + 1); + strcpy(p, s); + if (slash) + strcat(p, slash); + + /* + * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when + * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from + * the partial URL obtained from the branches file plus + * "/netdev-2.6" and does not store it in any tracking ref. + * #branch specifier in the file is ignored. + * + * Otherwise, the branches file would have URL and optionally + * #branch specified. The "master" (or specified) branch is + * fetched and stored in the local branch of the same name. + */ + frag = strchr(p, '#'); + if (frag) { + *(frag++) = '\0'; + strbuf_addf(&branch, "refs/heads/%s", frag); + } else + strbuf_addstr(&branch, "refs/heads/master"); + if (!slash) { + strbuf_addf(&branch, ":refs/heads/%s", remote->name); + } else { + strbuf_reset(&branch); + strbuf_addstr(&branch, "HEAD:"); + } + add_url_alias(remote, p); + add_fetch_refspec(remote, strbuf_detach(&branch, NULL)); + /* + * Cogito compatible push: push current HEAD to remote #branch + * (master if missing) + */ + strbuf_init(&branch, 0); + strbuf_addstr(&branch, "HEAD"); + if (frag) + strbuf_addf(&branch, ":refs/heads/%s", frag); + else + strbuf_addstr(&branch, ":refs/heads/master"); + add_push_refspec(remote, strbuf_detach(&branch, NULL)); + remote->fetch_tags = 1; /* always auto-follow */ +} + +static int handle_config(const char *key, const char *value, void *cb) +{ + const char *name; + const char *subkey; + struct remote *remote; + struct branch *branch; + if (!prefixcmp(key, "branch.")) { + name = key + 7; + subkey = strrchr(name, '.'); + if (!subkey) + return 0; + branch = make_branch(name, subkey - name); + if (!strcmp(subkey, ".remote")) { + if (!value) + return config_error_nonbool(key); + branch->remote_name = xstrdup(value); + if (branch == current_branch) { + default_remote_name = branch->remote_name; + explicit_default_remote_name = 1; + } + } else if (!strcmp(subkey, ".merge")) { + if (!value) + return config_error_nonbool(key); + add_merge(branch, xstrdup(value)); + } + return 0; + } + if (!prefixcmp(key, "url.")) { + struct rewrite *rewrite; + name = key + 4; + subkey = strrchr(name, '.'); + if (!subkey) + return 0; + if (!strcmp(subkey, ".insteadof")) { + rewrite = make_rewrite(&rewrites, name, subkey - name); + if (!value) + return config_error_nonbool(key); + add_instead_of(rewrite, xstrdup(value)); + } else if (!strcmp(subkey, ".pushinsteadof")) { + rewrite = make_rewrite(&rewrites_push, name, subkey - name); + if (!value) + return config_error_nonbool(key); + add_instead_of(rewrite, xstrdup(value)); + } + } + if (prefixcmp(key, "remote.")) + return 0; + name = key + 7; + if (*name == '/') { + warning("Config remote shorthand cannot begin with '/': %s", + name); + return 0; + } + subkey = strrchr(name, '.'); + if (!subkey) + return 0; + remote = make_remote(name, subkey - name); + remote->origin = REMOTE_CONFIG; + if (!strcmp(subkey, ".mirror")) + remote->mirror = git_config_bool(key, value); + else if (!strcmp(subkey, ".skipdefaultupdate")) + remote->skip_default_update = git_config_bool(key, value); + else if (!strcmp(subkey, ".skipfetchall")) + remote->skip_default_update = git_config_bool(key, value); + else if (!strcmp(subkey, ".url")) { + const char *v; + if (git_config_string(&v, key, value)) + return -1; + add_url(remote, v); + } else if (!strcmp(subkey, ".pushurl")) { + const char *v; + if (git_config_string(&v, key, value)) + return -1; + add_pushurl(remote, v); + } else if (!strcmp(subkey, ".push")) { + const char *v; + if (git_config_string(&v, key, value)) + return -1; + add_push_refspec(remote, v); + } else if (!strcmp(subkey, ".fetch")) { + const char *v; + if (git_config_string(&v, key, value)) + return -1; + add_fetch_refspec(remote, v); + } else if (!strcmp(subkey, ".receivepack")) { + const char *v; + if (git_config_string(&v, key, value)) + return -1; + if (!remote->receivepack) + remote->receivepack = v; + else + error("more than one receivepack given, using the first"); + } else if (!strcmp(subkey, ".uploadpack")) { + const char *v; + if (git_config_string(&v, key, value)) + return -1; + if (!remote->uploadpack) + remote->uploadpack = v; + else + error("more than one uploadpack given, using the first"); + } else if (!strcmp(subkey, ".tagopt")) { + if (!strcmp(value, "--no-tags")) + remote->fetch_tags = -1; + else if (!strcmp(value, "--tags")) + remote->fetch_tags = 2; + } else if (!strcmp(subkey, ".proxy")) { + return git_config_string((const char **)&remote->http_proxy, + key, value); + } else if (!strcmp(subkey, ".vcs")) { + return git_config_string(&remote->foreign_vcs, key, value); + } + return 0; +} + +static void alias_all_urls(void) +{ + int i, j; + for (i = 0; i < remotes_nr; i++) { + int add_pushurl_aliases; + if (!remotes[i]) + continue; + for (j = 0; j < remotes[i]->pushurl_nr; j++) { + remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites); + } + add_pushurl_aliases = remotes[i]->pushurl_nr == 0; + for (j = 0; j < remotes[i]->url_nr; j++) { + if (add_pushurl_aliases) + add_pushurl_alias(remotes[i], remotes[i]->url[j]); + remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites); + } + } +} + +static void read_config(void) +{ + unsigned char sha1[20]; + const char *head_ref; + int flag; + if (default_remote_name) /* did this already */ + return; + default_remote_name = xstrdup("origin"); + current_branch = NULL; + head_ref = resolve_ref("HEAD", sha1, 0, &flag); + if (head_ref && (flag & REF_ISSYMREF) && + !prefixcmp(head_ref, "refs/heads/")) { + current_branch = + make_branch(head_ref + strlen("refs/heads/"), 0); + } + git_config(handle_config, NULL); + alias_all_urls(); +} + +/* + * We need to make sure the remote-tracking branches are well formed, but a + * wildcard refspec in "struct refspec" must have a trailing slash. We + * temporarily drop the trailing '/' while calling check_ref_format(), + * and put it back. The caller knows that a CHECK_REF_FORMAT_ONELEVEL + * error return is Ok for a wildcard refspec. + */ +static int verify_refname(char *name, int is_glob) +{ + int result; + + result = check_ref_format(name); + if (is_glob && result == CHECK_REF_FORMAT_WILDCARD) + result = CHECK_REF_FORMAT_OK; + return result; +} + +/* + * This function frees a refspec array. + * Warning: code paths should be checked to ensure that the src + * and dst pointers are always freeable pointers as well + * as the refspec pointer itself. + */ +static void free_refspecs(struct refspec *refspec, int nr_refspec) +{ + int i; + + if (!refspec) + return; + + for (i = 0; i < nr_refspec; i++) { + free(refspec[i].src); + free(refspec[i].dst); + } + free(refspec); +} + +static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify) +{ + int i; + int st; + struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec); + + for (i = 0; i < nr_refspec; i++) { + size_t llen; + int is_glob; + const char *lhs, *rhs; + + is_glob = 0; + + lhs = refspec[i]; + if (*lhs == '+') { + rs[i].force = 1; + lhs++; + } + + rhs = strrchr(lhs, ':'); + + /* + * Before going on, special case ":" (or "+:") as a refspec + * for matching refs. + */ + if (!fetch && rhs == lhs && rhs[1] == '\0') { + rs[i].matching = 1; + continue; + } + + if (rhs) { + size_t rlen = strlen(++rhs); + is_glob = (1 <= rlen && strchr(rhs, '*')); + rs[i].dst = xstrndup(rhs, rlen); + } + + llen = (rhs ? (rhs - lhs - 1) : strlen(lhs)); + if (1 <= llen && memchr(lhs, '*', llen)) { + if ((rhs && !is_glob) || (!rhs && fetch)) + goto invalid; + is_glob = 1; + } else if (rhs && is_glob) { + goto invalid; + } + + rs[i].pattern = is_glob; + rs[i].src = xstrndup(lhs, llen); + + if (fetch) { + /* + * LHS + * - empty is allowed; it means HEAD. + * - otherwise it must be a valid looking ref. + */ + if (!*rs[i].src) + ; /* empty is ok */ + else { + st = verify_refname(rs[i].src, is_glob); + if (st && st != CHECK_REF_FORMAT_ONELEVEL) + goto invalid; + } + /* + * RHS + * - missing is ok, and is same as empty. + * - empty is ok; it means not to store. + * - otherwise it must be a valid looking ref. + */ + if (!rs[i].dst) { + ; /* ok */ + } else if (!*rs[i].dst) { + ; /* ok */ + } else { + st = verify_refname(rs[i].dst, is_glob); + if (st && st != CHECK_REF_FORMAT_ONELEVEL) + goto invalid; + } + } else { + /* + * LHS + * - empty is allowed; it means delete. + * - when wildcarded, it must be a valid looking ref. + * - otherwise, it must be an extended SHA-1, but + * there is no existing way to validate this. + */ + if (!*rs[i].src) + ; /* empty is ok */ + else if (is_glob) { + st = verify_refname(rs[i].src, is_glob); + if (st && st != CHECK_REF_FORMAT_ONELEVEL) + goto invalid; + } + else + ; /* anything goes, for now */ + /* + * RHS + * - missing is allowed, but LHS then must be a + * valid looking ref. + * - empty is not allowed. + * - otherwise it must be a valid looking ref. + */ + if (!rs[i].dst) { + st = verify_refname(rs[i].src, is_glob); + if (st && st != CHECK_REF_FORMAT_ONELEVEL) + goto invalid; + } else if (!*rs[i].dst) { + goto invalid; + } else { + st = verify_refname(rs[i].dst, is_glob); + if (st && st != CHECK_REF_FORMAT_ONELEVEL) + goto invalid; + } + } + } + return rs; + + invalid: + if (verify) { + /* + * nr_refspec must be greater than zero and i must be valid + * since it is only possible to reach this point from within + * the for loop above. + */ + free_refspecs(rs, i+1); + return NULL; + } + die("Invalid refspec '%s'", refspec[i]); +} + +int valid_fetch_refspec(const char *fetch_refspec_str) +{ + struct refspec *refspec; + + refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1); + free_refspecs(refspec, 1); + return !!refspec; +} + +struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec) +{ + return parse_refspec_internal(nr_refspec, refspec, 1, 0); +} + +static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec) +{ + return parse_refspec_internal(nr_refspec, refspec, 0, 0); +} + +void free_refspec(int nr_refspec, struct refspec *refspec) +{ + int i; + for (i = 0; i < nr_refspec; i++) { + free(refspec[i].src); + free(refspec[i].dst); + } + free(refspec); +} + +static int valid_remote_nick(const char *name) +{ + if (!name[0] || is_dot_or_dotdot(name)) + return 0; + return !strchr(name, '/'); /* no slash */ +} + +struct remote *remote_get(const char *name) +{ + struct remote *ret; + int name_given = 0; + + read_config(); + if (name) + name_given = 1; + else { + name = default_remote_name; + name_given = explicit_default_remote_name; + } + + ret = make_remote(name, 0); + if (valid_remote_nick(name)) { + if (!valid_remote(ret)) + read_remotes_file(ret); + if (!valid_remote(ret)) + read_branches_file(ret); + } + if (name_given && !valid_remote(ret)) + add_url_alias(ret, name); + if (!valid_remote(ret)) + return NULL; + ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec); + ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec); + return ret; +} + +int remote_is_configured(const char *name) +{ + int i; + read_config(); + + for (i = 0; i < remotes_nr; i++) + if (!strcmp(name, remotes[i]->name)) + return 1; + return 0; +} + +int for_each_remote(each_remote_fn fn, void *priv) +{ + int i, result = 0; + read_config(); + for (i = 0; i < remotes_nr && !result; i++) { + struct remote *r = remotes[i]; + if (!r) + continue; + if (!r->fetch) + r->fetch = parse_fetch_refspec(r->fetch_refspec_nr, + r->fetch_refspec); + if (!r->push) + r->push = parse_push_refspec(r->push_refspec_nr, + r->push_refspec); + result = fn(r, priv); + } + return result; +} + +void ref_remove_duplicates(struct ref *ref_map) +{ + struct string_list refs = STRING_LIST_INIT_NODUP; + struct string_list_item *item = NULL; + struct ref *prev = NULL, *next = NULL; + for (; ref_map; prev = ref_map, ref_map = next) { + next = ref_map->next; + if (!ref_map->peer_ref) + continue; + + item = string_list_lookup(&refs, ref_map->peer_ref->name); + if (item) { + if (strcmp(((struct ref *)item->util)->name, + ref_map->name)) + die("%s tracks both %s and %s", + ref_map->peer_ref->name, + ((struct ref *)item->util)->name, + ref_map->name); + prev->next = ref_map->next; + free(ref_map->peer_ref); + free(ref_map); + ref_map = prev; /* skip this; we freed it */ + continue; + } + + item = string_list_insert(&refs, ref_map->peer_ref->name); + item->util = ref_map; + } + string_list_clear(&refs, 0); +} + +int remote_has_url(struct remote *remote, const char *url) +{ + int i; + for (i = 0; i < remote->url_nr; i++) { + if (!strcmp(remote->url[i], url)) + return 1; + } + return 0; +} + +static int match_name_with_pattern(const char *key, const char *name, + const char *value, char **result) +{ + const char *kstar = strchr(key, '*'); + size_t klen; + size_t ksuffixlen; + size_t namelen; + int ret; + if (!kstar) + die("Key '%s' of pattern had no '*'", key); + klen = kstar - key; + ksuffixlen = strlen(kstar + 1); + namelen = strlen(name); + ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen && + !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen); + if (ret && value) { + const char *vstar = strchr(value, '*'); + size_t vlen; + size_t vsuffixlen; + if (!vstar) + die("Value '%s' of pattern has no '*'", value); + vlen = vstar - value; + vsuffixlen = strlen(vstar + 1); + *result = xmalloc(vlen + vsuffixlen + + strlen(name) - + klen - ksuffixlen + 1); + strncpy(*result, value, vlen); + strncpy(*result + vlen, + name + klen, namelen - klen - ksuffixlen); + strcpy(*result + vlen + namelen - klen - ksuffixlen, + vstar + 1); + } + return ret; +} + +static int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query) +{ + int i; + int find_src = !query->src; + + if (find_src && !query->dst) + return error("query_refspecs: need either src or dst"); + + for (i = 0; i < ref_count; i++) { + struct refspec *refspec = &refs[i]; + const char *key = find_src ? refspec->dst : refspec->src; + const char *value = find_src ? refspec->src : refspec->dst; + const char *needle = find_src ? query->dst : query->src; + char **result = find_src ? &query->src : &query->dst; + + if (!refspec->dst) + continue; + if (refspec->pattern) { + if (match_name_with_pattern(key, needle, value, result)) { + query->force = refspec->force; + return 0; + } + } else if (!strcmp(needle, key)) { + *result = xstrdup(value); + query->force = refspec->force; + return 0; + } + } + return -1; +} + +char *apply_refspecs(struct refspec *refspecs, int nr_refspec, + const char *name) +{ + struct refspec query; + + memset(&query, 0, sizeof(struct refspec)); + query.src = (char *)name; + + if (query_refspecs(refspecs, nr_refspec, &query)) + return NULL; + + return query.dst; +} + +int remote_find_tracking(struct remote *remote, struct refspec *refspec) +{ + return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec); +} + +static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen, + const char *name) +{ + size_t len = strlen(name); + struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1); + memcpy(ref->name, prefix, prefixlen); + memcpy(ref->name + prefixlen, name, len); + return ref; +} + +struct ref *alloc_ref(const char *name) +{ + return alloc_ref_with_prefix("", 0, name); +} + +struct ref *copy_ref(const struct ref *ref) +{ + struct ref *cpy; + size_t len; + if (!ref) + return NULL; + len = strlen(ref->name); + cpy = xmalloc(sizeof(struct ref) + len + 1); + memcpy(cpy, ref, sizeof(struct ref) + len + 1); + cpy->next = NULL; + cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL; + cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL; + cpy->peer_ref = copy_ref(ref->peer_ref); + return cpy; +} + +struct ref *copy_ref_list(const struct ref *ref) +{ + struct ref *ret = NULL; + struct ref **tail = &ret; + while (ref) { + *tail = copy_ref(ref); + ref = ref->next; + tail = &((*tail)->next); + } + return ret; +} + +static void free_ref(struct ref *ref) +{ + if (!ref) + return; + free_ref(ref->peer_ref); + free(ref->remote_status); + free(ref->symref); + free(ref); +} + +void free_refs(struct ref *ref) +{ + struct ref *next; + while (ref) { + next = ref->next; + free_ref(ref); + ref = next; + } +} + +static int count_refspec_match(const char *pattern, + struct ref *refs, + struct ref **matched_ref) +{ + int patlen = strlen(pattern); + struct ref *matched_weak = NULL; + struct ref *matched = NULL; + int weak_match = 0; + int match = 0; + + for (weak_match = match = 0; refs; refs = refs->next) { + char *name = refs->name; + int namelen = strlen(name); + + if (!refname_match(pattern, name, ref_rev_parse_rules)) + continue; + + /* A match is "weak" if it is with refs outside + * heads or tags, and did not specify the pattern + * in full (e.g. "refs/remotes/origin/master") or at + * least from the toplevel (e.g. "remotes/origin/master"); + * otherwise "git push $URL master" would result in + * ambiguity between remotes/origin/master and heads/master + * at the remote site. + */ + if (namelen != patlen && + patlen != namelen - 5 && + prefixcmp(name, "refs/heads/") && + prefixcmp(name, "refs/tags/")) { + /* We want to catch the case where only weak + * matches are found and there are multiple + * matches, and where more than one strong + * matches are found, as ambiguous. One + * strong match with zero or more weak matches + * are acceptable as a unique match. + */ + matched_weak = refs; + weak_match++; + } + else { + matched = refs; + match++; + } + } + if (!matched) { + *matched_ref = matched_weak; + return weak_match; + } + else { + *matched_ref = matched; + return match; + } +} + +static void tail_link_ref(struct ref *ref, struct ref ***tail) +{ + **tail = ref; + while (ref->next) + ref = ref->next; + *tail = &ref->next; +} + +static struct ref *try_explicit_object_name(const char *name) +{ + unsigned char sha1[20]; + struct ref *ref; + + if (!*name) { + ref = alloc_ref("(delete)"); + hashclr(ref->new_sha1); + return ref; + } + if (get_sha1(name, sha1)) + return NULL; + ref = alloc_ref(name); + hashcpy(ref->new_sha1, sha1); + return ref; +} + +static struct ref *make_linked_ref(const char *name, struct ref ***tail) +{ + struct ref *ret = alloc_ref(name); + tail_link_ref(ret, tail); + return ret; +} + +static char *guess_ref(const char *name, struct ref *peer) +{ + struct strbuf buf = STRBUF_INIT; + unsigned char sha1[20]; + + const char *r = resolve_ref(peer->name, sha1, 1, NULL); + if (!r) + return NULL; + + if (!prefixcmp(r, "refs/heads/")) + strbuf_addstr(&buf, "refs/heads/"); + else if (!prefixcmp(r, "refs/tags/")) + strbuf_addstr(&buf, "refs/tags/"); + else + return NULL; + + strbuf_addstr(&buf, name); + return strbuf_detach(&buf, NULL); +} + +static int match_explicit(struct ref *src, struct ref *dst, + struct ref ***dst_tail, + struct refspec *rs) +{ + struct ref *matched_src, *matched_dst; + int copy_src; + + const char *dst_value = rs->dst; + char *dst_guess; + + if (rs->pattern || rs->matching) + return 0; + + matched_src = matched_dst = NULL; + switch (count_refspec_match(rs->src, src, &matched_src)) { + case 1: + copy_src = 1; + break; + case 0: + /* The source could be in the get_sha1() format + * not a reference name. :refs/other is a + * way to delete 'other' ref at the remote end. + */ + matched_src = try_explicit_object_name(rs->src); + if (!matched_src) + return error("src refspec %s does not match any.", rs->src); + copy_src = 0; + break; + default: + return error("src refspec %s matches more than one.", rs->src); + } + + if (!dst_value) { + unsigned char sha1[20]; + int flag; + + dst_value = resolve_ref(matched_src->name, sha1, 1, &flag); + if (!dst_value || + ((flag & REF_ISSYMREF) && + prefixcmp(dst_value, "refs/heads/"))) + die("%s cannot be resolved to branch.", + matched_src->name); + } + + switch (count_refspec_match(dst_value, dst, &matched_dst)) { + case 1: + break; + case 0: + if (!memcmp(dst_value, "refs/", 5)) + matched_dst = make_linked_ref(dst_value, dst_tail); + else if ((dst_guess = guess_ref(dst_value, matched_src))) + matched_dst = make_linked_ref(dst_guess, dst_tail); + else + error("unable to push to unqualified destination: %s\n" + "The destination refspec neither matches an " + "existing ref on the remote nor\n" + "begins with refs/, and we are unable to " + "guess a prefix based on the source ref.", + dst_value); + break; + default: + matched_dst = NULL; + error("dst refspec %s matches more than one.", + dst_value); + break; + } + if (!matched_dst) + return -1; + if (matched_dst->peer_ref) + return error("dst ref %s receives from more than one src.", + matched_dst->name); + else { + matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src; + matched_dst->force = rs->force; + } + return 0; +} + +static int match_explicit_refs(struct ref *src, struct ref *dst, + struct ref ***dst_tail, struct refspec *rs, + int rs_nr) +{ + int i, errs; + for (i = errs = 0; i < rs_nr; i++) + errs += match_explicit(src, dst, dst_tail, &rs[i]); + return errs; +} + +static const struct refspec *check_pattern_match(const struct refspec *rs, + int rs_nr, + const struct ref *src) +{ + int i; + int matching_refs = -1; + for (i = 0; i < rs_nr; i++) { + if (rs[i].matching && + (matching_refs == -1 || rs[i].force)) { + matching_refs = i; + continue; + } + + if (rs[i].pattern && match_name_with_pattern(rs[i].src, src->name, + NULL, NULL)) + return rs + i; + } + if (matching_refs != -1) + return rs + matching_refs; + else + return NULL; +} + +static struct ref **tail_ref(struct ref **head) +{ + struct ref **tail = head; + while (*tail) + tail = &((*tail)->next); + return tail; +} + +/* + * Note. This is used only by "push"; refspec matching rules for + * push and fetch are subtly different, so do not try to reuse it + * without thinking. + */ +int match_refs(struct ref *src, struct ref **dst, + int nr_refspec, const char **refspec, int flags) +{ + struct refspec *rs; + int send_all = flags & MATCH_REFS_ALL; + int send_mirror = flags & MATCH_REFS_MIRROR; + int errs; + static const char *default_refspec[] = { ":", NULL }; + struct ref **dst_tail = tail_ref(dst); + + if (!nr_refspec) { + nr_refspec = 1; + refspec = default_refspec; + } + rs = parse_push_refspec(nr_refspec, (const char **) refspec); + errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec); + + /* pick the remainder */ + for ( ; src; src = src->next) { + struct ref *dst_peer; + const struct refspec *pat = NULL; + char *dst_name; + if (src->peer_ref) + continue; + + pat = check_pattern_match(rs, nr_refspec, src); + if (!pat) + continue; + + if (pat->matching) { + /* + * "matching refs"; traditionally we pushed everything + * including refs outside refs/heads/ hierarchy, but + * that does not make much sense these days. + */ + if (!send_mirror && prefixcmp(src->name, "refs/heads/")) + continue; + dst_name = xstrdup(src->name); + + } else { + const char *dst_side = pat->dst ? pat->dst : pat->src; + if (!match_name_with_pattern(pat->src, src->name, + dst_side, &dst_name)) + die("Didn't think it matches any more"); + } + dst_peer = find_ref_by_name(*dst, dst_name); + if (dst_peer) { + if (dst_peer->peer_ref) + /* We're already sending something to this ref. */ + goto free_name; + + } else { + if (pat->matching && !(send_all || send_mirror)) + /* + * Remote doesn't have it, and we have no + * explicit pattern, and we don't have + * --all nor --mirror. + */ + goto free_name; + + /* Create a new one and link it */ + dst_peer = make_linked_ref(dst_name, &dst_tail); + hashcpy(dst_peer->new_sha1, src->new_sha1); + } + dst_peer->peer_ref = copy_ref(src); + dst_peer->force = pat->force; + free_name: + free(dst_name); + } + if (errs) + return -1; + return 0; +} + +void set_ref_status_for_push(struct ref *remote_refs, int send_mirror, + int force_update) +{ + struct ref *ref; + + for (ref = remote_refs; ref; ref = ref->next) { + if (ref->peer_ref) + hashcpy(ref->new_sha1, ref->peer_ref->new_sha1); + else if (!send_mirror) + continue; + + ref->deletion = is_null_sha1(ref->new_sha1); + if (!ref->deletion && + !hashcmp(ref->old_sha1, ref->new_sha1)) { + ref->status = REF_STATUS_UPTODATE; + continue; + } + + /* This part determines what can overwrite what. + * The rules are: + * + * (0) you can always use --force or +A:B notation to + * selectively force individual ref pairs. + * + * (1) if the old thing does not exist, it is OK. + * + * (2) if you do not have the old thing, you are not allowed + * to overwrite it; you would not know what you are losing + * otherwise. + * + * (3) if both new and old are commit-ish, and new is a + * descendant of old, it is OK. + * + * (4) regardless of all of the above, removing :B is + * always allowed. + */ + + ref->nonfastforward = + !ref->deletion && + !is_null_sha1(ref->old_sha1) && + (!has_sha1_file(ref->old_sha1) + || !ref_newer(ref->new_sha1, ref->old_sha1)); + + if (ref->nonfastforward && !ref->force && !force_update) { + ref->status = REF_STATUS_REJECT_NONFASTFORWARD; + continue; + } + } +} + +struct branch *branch_get(const char *name) +{ + struct branch *ret; + + read_config(); + if (!name || !*name || !strcmp(name, "HEAD")) + ret = current_branch; + else + ret = make_branch(name, 0); + if (ret && ret->remote_name) { + ret->remote = remote_get(ret->remote_name); + if (ret->merge_nr) { + int i; + ret->merge = xcalloc(sizeof(*ret->merge), + ret->merge_nr); + for (i = 0; i < ret->merge_nr; i++) { + ret->merge[i] = xcalloc(1, sizeof(**ret->merge)); + ret->merge[i]->src = xstrdup(ret->merge_name[i]); + if (remote_find_tracking(ret->remote, ret->merge[i]) + && !strcmp(ret->remote_name, ".")) + ret->merge[i]->dst = xstrdup(ret->merge_name[i]); + } + } + } + return ret; +} + +int branch_has_merge_config(struct branch *branch) +{ + return branch && !!branch->merge; +} + +int branch_merge_matches(struct branch *branch, + int i, + const char *refname) +{ + if (!branch || i < 0 || i >= branch->merge_nr) + return 0; + return refname_match(branch->merge[i]->src, refname, ref_fetch_rules); +} + +static struct ref *get_expanded_map(const struct ref *remote_refs, + const struct refspec *refspec) +{ + const struct ref *ref; + struct ref *ret = NULL; + struct ref **tail = &ret; + + char *expn_name; + + for (ref = remote_refs; ref; ref = ref->next) { + if (strchr(ref->name, '^')) + continue; /* a dereference item */ + if (match_name_with_pattern(refspec->src, ref->name, + refspec->dst, &expn_name)) { + struct ref *cpy = copy_ref(ref); + + cpy->peer_ref = alloc_ref(expn_name); + free(expn_name); + if (refspec->force) + cpy->peer_ref->force = 1; + *tail = cpy; + tail = &cpy->next; + } + } + + return ret; +} + +static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name) +{ + const struct ref *ref; + for (ref = refs; ref; ref = ref->next) { + if (refname_match(name, ref->name, ref_fetch_rules)) + return ref; + } + return NULL; +} + +struct ref *get_remote_ref(const struct ref *remote_refs, const char *name) +{ + const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name); + + if (!ref) + return NULL; + + return copy_ref(ref); +} + +static struct ref *get_local_ref(const char *name) +{ + if (!name || name[0] == '\0') + return NULL; + + if (!prefixcmp(name, "refs/")) + return alloc_ref(name); + + if (!prefixcmp(name, "heads/") || + !prefixcmp(name, "tags/") || + !prefixcmp(name, "remotes/")) + return alloc_ref_with_prefix("refs/", 5, name); + + return alloc_ref_with_prefix("refs/heads/", 11, name); +} + +int get_fetch_map(const struct ref *remote_refs, + const struct refspec *refspec, + struct ref ***tail, + int missing_ok) +{ + struct ref *ref_map, **rmp; + + if (refspec->pattern) { + ref_map = get_expanded_map(remote_refs, refspec); + } else { + const char *name = refspec->src[0] ? refspec->src : "HEAD"; + + ref_map = get_remote_ref(remote_refs, name); + if (!missing_ok && !ref_map) + die("Couldn't find remote ref %s", name); + if (ref_map) { + ref_map->peer_ref = get_local_ref(refspec->dst); + if (ref_map->peer_ref && refspec->force) + ref_map->peer_ref->force = 1; + } + } + + for (rmp = &ref_map; *rmp; ) { + if ((*rmp)->peer_ref) { + int st = check_ref_format((*rmp)->peer_ref->name + 5); + if (st && st != CHECK_REF_FORMAT_ONELEVEL) { + struct ref *ignore = *rmp; + error("* Ignoring funny ref '%s' locally", + (*rmp)->peer_ref->name); + *rmp = (*rmp)->next; + free(ignore->peer_ref); + free(ignore); + continue; + } + } + rmp = &((*rmp)->next); + } + + if (ref_map) + tail_link_ref(ref_map, tail); + + return 0; +} + +int resolve_remote_symref(struct ref *ref, struct ref *list) +{ + if (!ref->symref) + return 0; + for (; list; list = list->next) + if (!strcmp(ref->symref, list->name)) { + hashcpy(ref->old_sha1, list->old_sha1); + return 0; + } + return 1; +} + +static void unmark_and_free(struct commit_list *list, unsigned int mark) +{ + while (list) { + struct commit_list *temp = list; + temp->item->object.flags &= ~mark; + list = temp->next; + free(temp); + } +} + +int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1) +{ + struct object *o; + struct commit *old, *new; + struct commit_list *list, *used; + int found = 0; + + /* Both new and old must be commit-ish and new is descendant of + * old. Otherwise we require --force. + */ + o = deref_tag(parse_object(old_sha1), NULL, 0); + if (!o || o->type != OBJ_COMMIT) + return 0; + old = (struct commit *) o; + + o = deref_tag(parse_object(new_sha1), NULL, 0); + if (!o || o->type != OBJ_COMMIT) + return 0; + new = (struct commit *) o; + + if (parse_commit(new) < 0) + return 0; + + used = list = NULL; + commit_list_insert(new, &list); + while (list) { + new = pop_most_recent_commit(&list, TMP_MARK); + commit_list_insert(new, &used); + if (new == old) { + found = 1; + break; + } + } + unmark_and_free(list, TMP_MARK); + unmark_and_free(used, TMP_MARK); + return found; +} + +/* + * Return true if there is anything to report, otherwise false. + */ +int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs) +{ + unsigned char sha1[20]; + struct commit *ours, *theirs; + char symmetric[84]; + struct rev_info revs; + const char *rev_argv[10], *base; + int rev_argc; + + /* + * Nothing to report unless we are marked to build on top of + * somebody else. + */ + if (!branch || + !branch->merge || !branch->merge[0] || !branch->merge[0]->dst) + return 0; + + /* + * If what we used to build on no longer exists, there is + * nothing to report. + */ + base = branch->merge[0]->dst; + if (!resolve_ref(base, sha1, 1, NULL)) + return 0; + theirs = lookup_commit_reference(sha1); + if (!theirs) + return 0; + + if (!resolve_ref(branch->refname, sha1, 1, NULL)) + return 0; + ours = lookup_commit_reference(sha1); + if (!ours) + return 0; + + /* are we the same? */ + if (theirs == ours) + return 0; + + /* Run "rev-list --left-right ours...theirs" internally... */ + rev_argc = 0; + rev_argv[rev_argc++] = NULL; + rev_argv[rev_argc++] = "--left-right"; + rev_argv[rev_argc++] = symmetric; + rev_argv[rev_argc++] = "--"; + rev_argv[rev_argc] = NULL; + + strcpy(symmetric, sha1_to_hex(ours->object.sha1)); + strcpy(symmetric + 40, "..."); + strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1)); + + init_revisions(&revs, NULL); + setup_revisions(rev_argc, rev_argv, &revs, NULL); + prepare_revision_walk(&revs); + + /* ... and count the commits on each side. */ + *num_ours = 0; + *num_theirs = 0; + while (1) { + struct commit *c = get_revision(&revs); + if (!c) + break; + if (c->object.flags & SYMMETRIC_LEFT) + (*num_ours)++; + else + (*num_theirs)++; + } + + /* clear object flags smudged by the above traversal */ + clear_commit_marks(ours, ALL_REV_FLAGS); + clear_commit_marks(theirs, ALL_REV_FLAGS); + return 1; +} + +/* + * Return true when there is anything to report, otherwise false. + */ +int format_tracking_info(struct branch *branch, struct strbuf *sb) +{ + int num_ours, num_theirs; + const char *base; + + if (!stat_tracking_info(branch, &num_ours, &num_theirs)) + return 0; + + base = branch->merge[0]->dst; + base = shorten_unambiguous_ref(base, 0); + if (!num_theirs) + strbuf_addf(sb, "Your branch is ahead of '%s' " + "by %d commit%s.\n", + base, num_ours, (num_ours == 1) ? "" : "s"); + else if (!num_ours) + strbuf_addf(sb, "Your branch is behind '%s' " + "by %d commit%s, " + "and can be fast-forwarded.\n", + base, num_theirs, (num_theirs == 1) ? "" : "s"); + else + strbuf_addf(sb, "Your branch and '%s' have diverged,\n" + "and have %d and %d different commit(s) each, " + "respectively.\n", + base, num_ours, num_theirs); + return 1; +} + +static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data) +{ + struct ref ***local_tail = cb_data; + struct ref *ref; + int len; + + /* we already know it starts with refs/ to get here */ + if (check_ref_format(refname + 5)) + return 0; + + len = strlen(refname) + 1; + ref = xcalloc(1, sizeof(*ref) + len); + hashcpy(ref->new_sha1, sha1); + memcpy(ref->name, refname, len); + **local_tail = ref; + *local_tail = &ref->next; + return 0; +} + +struct ref *get_local_heads(void) +{ + struct ref *local_refs = NULL, **local_tail = &local_refs; + for_each_ref(one_local_ref, &local_tail); + return local_refs; +} + +struct ref *guess_remote_head(const struct ref *head, + const struct ref *refs, + int all) +{ + const struct ref *r; + struct ref *list = NULL; + struct ref **tail = &list; + + if (!head) + return NULL; + + /* + * Some transports support directly peeking at + * where HEAD points; if that is the case, then + * we don't have to guess. + */ + if (head->symref) + return copy_ref(find_ref_by_name(refs, head->symref)); + + /* If refs/heads/master could be right, it is. */ + if (!all) { + r = find_ref_by_name(refs, "refs/heads/master"); + if (r && !hashcmp(r->old_sha1, head->old_sha1)) + return copy_ref(r); + } + + /* Look for another ref that points there */ + for (r = refs; r; r = r->next) { + if (r != head && + !prefixcmp(r->name, "refs/heads/") && + !hashcmp(r->old_sha1, head->old_sha1)) { + *tail = copy_ref(r); + tail = &((*tail)->next); + if (!all) + break; + } + } + + return list; +} + +struct stale_heads_info { + struct string_list *ref_names; + struct ref **stale_refs_tail; + struct refspec *refs; + int ref_count; +}; + +static int get_stale_heads_cb(const char *refname, + const unsigned char *sha1, int flags, void *cb_data) +{ + struct stale_heads_info *info = cb_data; + struct refspec query; + memset(&query, 0, sizeof(struct refspec)); + query.dst = (char *)refname; + + if (query_refspecs(info->refs, info->ref_count, &query)) + return 0; /* No matches */ + + /* + * If we did find a suitable refspec and it's not a symref and + * it's not in the list of refs that currently exist in that + * remote we consider it to be stale. + */ + if (!((flags & REF_ISSYMREF) || + string_list_has_string(info->ref_names, query.src))) { + struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail); + hashcpy(ref->new_sha1, sha1); + } + + free(query.src); + return 0; +} + +struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map) +{ + struct ref *ref, *stale_refs = NULL; + struct string_list ref_names = STRING_LIST_INIT_NODUP; + struct stale_heads_info info; + info.ref_names = &ref_names; + info.stale_refs_tail = &stale_refs; + info.refs = refs; + info.ref_count = ref_count; + for (ref = fetch_map; ref; ref = ref->next) + string_list_append(&ref_names, ref->name); + sort_string_list(&ref_names); + for_each_ref(get_stale_heads_cb, &info); + string_list_clear(&ref_names, 0); + return stale_refs; +} |