diff options
Diffstat (limited to 'remote.c')
| -rw-r--r-- | remote.c | 924 |
1 files changed, 924 insertions, 0 deletions
diff --git a/remote.c b/remote.c new file mode 100644 index 000000000..6b56473f5 --- /dev/null +++ b/remote.c @@ -0,0 +1,924 @@ +#include "cache.h" +#include "remote.h" +#include "refs.h" + +static struct remote **remotes; +static int allocated_remotes; + +static struct branch **branches; +static int allocated_branches; + +static struct branch *current_branch; +static const char *default_remote_name; + +#define BUF_SIZE (2048) +static char buffer[BUF_SIZE]; + +static void add_push_refspec(struct remote *remote, const char *ref) +{ + int nr = remote->push_refspec_nr + 1; + remote->push_refspec = + xrealloc(remote->push_refspec, nr * sizeof(char *)); + remote->push_refspec[nr-1] = ref; + remote->push_refspec_nr = nr; +} + +static void add_fetch_refspec(struct remote *remote, const char *ref) +{ + int nr = remote->fetch_refspec_nr + 1; + remote->fetch_refspec = + xrealloc(remote->fetch_refspec, nr * sizeof(char *)); + remote->fetch_refspec[nr-1] = ref; + remote->fetch_refspec_nr = nr; +} + +static void add_url(struct remote *remote, const char *url) +{ + int nr = remote->url_nr + 1; + remote->url = + xrealloc(remote->url, nr * sizeof(char *)); + remote->url[nr-1] = url; + remote->url_nr = nr; +} + +static struct remote *make_remote(const char *name, int len) +{ + int i, empty = -1; + + for (i = 0; i < allocated_remotes; i++) { + if (!remotes[i]) { + if (empty < 0) + empty = i; + } else { + if (len ? (!strncmp(name, remotes[i]->name, len) && + !remotes[i]->name[len]) : + !strcmp(name, remotes[i]->name)) + return remotes[i]; + } + } + + if (empty < 0) { + empty = allocated_remotes; + allocated_remotes += allocated_remotes ? allocated_remotes : 1; + remotes = xrealloc(remotes, + sizeof(*remotes) * allocated_remotes); + memset(remotes + empty, 0, + (allocated_remotes - empty) * sizeof(*remotes)); + } + remotes[empty] = xcalloc(1, sizeof(struct remote)); + if (len) + remotes[empty]->name = xstrndup(name, len); + else + remotes[empty]->name = xstrdup(name); + return remotes[empty]; +} + +static void add_merge(struct branch *branch, const char *name) +{ + int nr = branch->merge_nr + 1; + branch->merge_name = + xrealloc(branch->merge_name, nr * sizeof(char *)); + branch->merge_name[nr-1] = name; + branch->merge_nr = nr; +} + +static struct branch *make_branch(const char *name, int len) +{ + int i, empty = -1; + char *refname; + + for (i = 0; i < allocated_branches; i++) { + if (!branches[i]) { + if (empty < 0) + empty = i; + } else { + if (len ? (!strncmp(name, branches[i]->name, len) && + !branches[i]->name[len]) : + !strcmp(name, branches[i]->name)) + return branches[i]; + } + } + + if (empty < 0) { + empty = allocated_branches; + allocated_branches += allocated_branches ? allocated_branches : 1; + branches = xrealloc(branches, + sizeof(*branches) * allocated_branches); + memset(branches + empty, 0, + (allocated_branches - empty) * sizeof(*branches)); + } + branches[empty] = xcalloc(1, sizeof(struct branch)); + if (len) + branches[empty]->name = xstrndup(name, len); + else + branches[empty]->name = xstrdup(name); + refname = malloc(strlen(name) + strlen("refs/heads/") + 1); + strcpy(refname, "refs/heads/"); + strcpy(refname + strlen("refs/heads/"), + branches[empty]->name); + branches[empty]->refname = refname; + + return branches[empty]; +} + +static void read_remotes_file(struct remote *remote) +{ + FILE *f = fopen(git_path("remotes/%s", remote->name), "r"); + + if (!f) + return; + 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(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; + char *branch; + 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; + 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); + frag = strchr(p, '#'); + if (frag) { + *(frag++) = '\0'; + branch = xmalloc(strlen(frag) + 12); + strcpy(branch, "refs/heads/"); + strcat(branch, frag); + } else { + branch = "refs/heads/master"; + } + add_url(remote, p); + add_fetch_refspec(remote, branch); + remote->fetch_tags = 1; /* always auto-follow */ +} + +static int handle_config(const char *key, const char *value) +{ + 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; + } else if (!strcmp(subkey, ".merge")) { + if (!value) + return config_error_nonbool(key); + add_merge(branch, xstrdup(value)); + } + return 0; + } + if (prefixcmp(key, "remote.")) + return 0; + name = key + 7; + subkey = strrchr(name, '.'); + if (!subkey) + return error("Config with no key for remote %s", name); + if (*subkey == '/') { + warning("Config remote shorthand cannot begin with '/': %s", name); + return 0; + } + remote = make_remote(name, subkey - name); + if (!value) { + /* if we ever have a boolean variable, e.g. "remote.*.disabled" + * [remote "frotz"] + * disabled + * is a valid way to set it to true; we get NULL in value so + * we need to handle it here. + * + * if (!strcmp(subkey, ".disabled")) { + * val = git_config_bool(key, value); + * return 0; + * } else + * + */ + return 0; /* ignore unknown booleans */ + } + if (!strcmp(subkey, ".url")) { + add_url(remote, xstrdup(value)); + } else if (!strcmp(subkey, ".push")) { + add_push_refspec(remote, xstrdup(value)); + } else if (!strcmp(subkey, ".fetch")) { + add_fetch_refspec(remote, xstrdup(value)); + } else if (!strcmp(subkey, ".receivepack")) { + if (!remote->receivepack) + remote->receivepack = xstrdup(value); + else + error("more than one receivepack given, using the first"); + } else if (!strcmp(subkey, ".uploadpack")) { + if (!remote->uploadpack) + remote->uploadpack = xstrdup(value); + 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(subkey, ".proxy")) { + remote->http_proxy = xstrdup(value); + } + return 0; +} + +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); +} + +struct refspec *parse_ref_spec(int nr_refspec, const char **refspec) +{ + int i; + struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec); + for (i = 0; i < nr_refspec; i++) { + const char *sp, *ep, *gp; + sp = refspec[i]; + if (*sp == '+') { + rs[i].force = 1; + sp++; + } + gp = strchr(sp, '*'); + ep = strchr(sp, ':'); + if (gp && ep && gp > ep) + gp = NULL; + if (ep) { + if (ep[1]) { + const char *glob = strchr(ep + 1, '*'); + if (!glob) + gp = NULL; + if (gp) + rs[i].dst = xstrndup(ep + 1, + glob - ep - 1); + else + rs[i].dst = xstrdup(ep + 1); + } + } else { + ep = sp + strlen(sp); + } + if (gp) { + rs[i].pattern = 1; + ep = gp; + } + rs[i].src = xstrndup(sp, ep - sp); + } + return rs; +} + +static int valid_remote_nick(const char *name) +{ + if (!name[0] || /* not empty */ + (name[0] == '.' && /* not "." */ + (!name[1] || /* not ".." */ + (name[1] == '.' && !name[2])))) + return 0; + return !strchr(name, '/'); /* no slash */ +} + +struct remote *remote_get(const char *name) +{ + struct remote *ret; + + read_config(); + if (!name) + name = default_remote_name; + ret = make_remote(name, 0); + if (valid_remote_nick(name)) { + if (!ret->url) + read_remotes_file(ret); + if (!ret->url) + read_branches_file(ret); + } + if (!ret->url) + add_url(ret, name); + if (!ret->url) + return NULL; + ret->fetch = parse_ref_spec(ret->fetch_refspec_nr, ret->fetch_refspec); + ret->push = parse_ref_spec(ret->push_refspec_nr, ret->push_refspec); + return ret; +} + +int for_each_remote(each_remote_fn fn, void *priv) +{ + int i, result = 0; + read_config(); + for (i = 0; i < allocated_remotes && !result; i++) { + struct remote *r = remotes[i]; + if (!r) + continue; + if (!r->fetch) + r->fetch = parse_ref_spec(r->fetch_refspec_nr, + r->fetch_refspec); + if (!r->push) + r->push = parse_ref_spec(r->push_refspec_nr, + r->push_refspec); + result = fn(r, priv); + } + return result; +} + +void ref_remove_duplicates(struct ref *ref_map) +{ + struct ref **posn; + struct ref *next; + for (; ref_map; ref_map = ref_map->next) { + if (!ref_map->peer_ref) + continue; + posn = &ref_map->next; + while (*posn) { + if ((*posn)->peer_ref && + !strcmp((*posn)->peer_ref->name, + ref_map->peer_ref->name)) { + if (strcmp((*posn)->name, ref_map->name)) + die("%s tracks both %s and %s", + ref_map->peer_ref->name, + (*posn)->name, ref_map->name); + next = (*posn)->next; + free((*posn)->peer_ref); + free(*posn); + *posn = next; + } else { + posn = &(*posn)->next; + } + } + } +} + +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; +} + +int remote_find_tracking(struct remote *remote, struct refspec *refspec) +{ + int find_src = refspec->src == NULL; + char *needle, **result; + int i; + + if (find_src) { + if (!refspec->dst) + return error("find_tracking: need either src or dst"); + needle = refspec->dst; + result = &refspec->src; + } else { + needle = refspec->src; + result = &refspec->dst; + } + + for (i = 0; i < remote->fetch_refspec_nr; i++) { + struct refspec *fetch = &remote->fetch[i]; + const char *key = find_src ? fetch->dst : fetch->src; + const char *value = find_src ? fetch->src : fetch->dst; + if (!fetch->dst) + continue; + if (fetch->pattern) { + if (!prefixcmp(needle, key)) { + *result = xmalloc(strlen(value) + + strlen(needle) - + strlen(key) + 1); + strcpy(*result, value); + strcpy(*result + strlen(value), + needle + strlen(key)); + refspec->force = fetch->force; + return 0; + } + } else if (!strcmp(needle, key)) { + *result = xstrdup(value); + refspec->force = fetch->force; + return 0; + } + } + return -1; +} + +struct ref *alloc_ref(unsigned namelen) +{ + struct ref *ret = xmalloc(sizeof(struct ref) + namelen); + memset(ret, 0, sizeof(struct ref) + namelen); + return ret; +} + +static struct ref *copy_ref(const struct ref *ref) +{ + struct ref *ret = xmalloc(sizeof(struct ref) + strlen(ref->name) + 1); + memcpy(ret, ref, sizeof(struct ref) + strlen(ref->name) + 1); + ret->next = NULL; + return ret; +} + +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; +} + +void free_refs(struct ref *ref) +{ + struct ref *next; + while (ref) { + next = ref->next; + if (ref->peer_ref) + free(ref->peer_ref); + free(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; + int len; + + if (!*name) { + ref = alloc_ref(20); + strcpy(ref->name, "(delete)"); + hashclr(ref->new_sha1); + return ref; + } + if (get_sha1(name, sha1)) + return NULL; + len = strlen(name) + 1; + ref = alloc_ref(len); + memcpy(ref->name, name, len); + hashcpy(ref->new_sha1, sha1); + return ref; +} + +static struct ref *make_linked_ref(const char *name, struct ref ***tail) +{ + struct ref *ret; + size_t len; + + len = strlen(name) + 1; + ret = alloc_ref(len); + memcpy(ret->name, name, len); + tail_link_ref(ret, tail); + return ret; +} + +static int match_explicit(struct ref *src, struct ref *dst, + struct ref ***dst_tail, + struct refspec *rs, + int errs) +{ + struct ref *matched_src, *matched_dst; + + const char *dst_value = rs->dst; + + if (rs->pattern) + return errs; + + matched_src = matched_dst = NULL; + switch (count_refspec_match(rs->src, src, &matched_src)) { + case 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) + error("src refspec %s does not match any.", rs->src); + break; + default: + matched_src = NULL; + error("src refspec %s matches more than one.", rs->src); + break; + } + + if (!matched_src) + errs = 1; + + if (!dst_value) { + if (!matched_src) + return errs; + dst_value = 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 + error("dst refspec %s does not match any " + "existing ref on the remote and does " + "not start with refs/.", dst_value); + break; + default: + matched_dst = NULL; + error("dst refspec %s matches more than one.", + dst_value); + break; + } + if (errs || !matched_dst) + return 1; + if (matched_dst->peer_ref) { + errs = 1; + error("dst ref %s receives from more than one src.", + matched_dst->name); + } + else { + matched_dst->peer_ref = matched_src; + matched_dst->force = rs->force; + } + return errs; +} + +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], errs); + return -errs; +} + +static const struct refspec *check_pattern_match(const struct refspec *rs, + int rs_nr, + const struct ref *src) +{ + int i; + for (i = 0; i < rs_nr; i++) { + if (rs[i].pattern && !prefixcmp(src->name, rs[i].src)) + return rs + i; + } + return NULL; +} + +/* + * 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, struct ref ***dst_tail, + int nr_refspec, const char **refspec, int flags) +{ + struct refspec *rs = + parse_ref_spec(nr_refspec, (const char **) refspec); + int send_all = flags & MATCH_REFS_ALL; + int send_mirror = flags & MATCH_REFS_MIRROR; + + if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec)) + return -1; + + /* 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; + if (nr_refspec) { + pat = check_pattern_match(rs, nr_refspec, src); + if (!pat) + continue; + } + else if (!send_mirror && prefixcmp(src->name, "refs/heads/")) + /* + * "matching refs"; traditionally we pushed everything + * including refs outside refs/heads/ hierarchy, but + * that does not make much sense these days. + */ + continue; + + if (pat) { + const char *dst_side = pat->dst ? pat->dst : pat->src; + dst_name = xmalloc(strlen(dst_side) + + strlen(src->name) - + strlen(pat->src) + 2); + strcpy(dst_name, dst_side); + strcat(dst_name, src->name + strlen(pat->src)); + } else + dst_name = xstrdup(src->name); + dst_peer = find_ref_by_name(dst, dst_name); + if (dst_peer && dst_peer->peer_ref) + /* We're already sending something to this ref. */ + goto free_name; + + if (!dst_peer && !nr_refspec && !(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; + if (!dst_peer) { + /* 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 = src; + if (pat) + dst_peer->force = pat->force; + free_name: + free(dst_name); + } + return 0; +} + +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]); + remote_find_tracking(ret->remote, + ret->merge[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; + + int remote_prefix_len = strlen(refspec->src); + int local_prefix_len = strlen(refspec->dst); + + for (ref = remote_refs; ref; ref = ref->next) { + if (strchr(ref->name, '^')) + continue; /* a dereference item */ + if (!prefixcmp(ref->name, refspec->src)) { + const char *match; + struct ref *cpy = copy_ref(ref); + match = ref->name + remote_prefix_len; + + cpy->peer_ref = alloc_ref(local_prefix_len + + strlen(match) + 1); + sprintf(cpy->peer_ref->name, "%s%s", + refspec->dst, match); + 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) +{ + struct ref *ret; + if (!name) + return NULL; + + if (!prefixcmp(name, "refs/")) { + ret = alloc_ref(strlen(name) + 1); + strcpy(ret->name, name); + return ret; + } + + if (!prefixcmp(name, "heads/") || + !prefixcmp(name, "tags/") || + !prefixcmp(name, "remotes/")) { + ret = alloc_ref(strlen(name) + 6); + sprintf(ret->name, "refs/%s", name); + return ret; + } + + ret = alloc_ref(strlen(name) + 12); + sprintf(ret->name, "refs/heads/%s", name); + return ret; +} + +int get_fetch_map(const struct ref *remote_refs, + const struct refspec *refspec, + struct ref ***tail, + int missing_ok) +{ + struct ref *ref_map, *rm; + + 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 (rm = ref_map; rm; rm = rm->next) { + if (rm->peer_ref && check_ref_format(rm->peer_ref->name + 5)) + die("* refusing to create funny ref '%s' locally", + rm->peer_ref->name); + } + + if (ref_map) + tail_link_ref(ref_map, tail); + + return 0; +} |