diff options
Diffstat (limited to 'remote.c')
| -rw-r--r-- | remote.c | 553 |
1 files changed, 553 insertions, 0 deletions
diff --git a/remote.c b/remote.c new file mode 100644 index 0000000000..d904616cdb --- /dev/null +++ b/remote.c @@ -0,0 +1,553 @@ +#include "cache.h" +#include "remote.h" +#include "refs.h" + +static struct remote **remotes; +static int allocated_remotes; + +#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_uri(struct remote *remote, const char *uri) +{ + int nr = remote->uri_nr + 1; + remote->uri = + xrealloc(remote->uri, nr * sizeof(char *)); + remote->uri[nr-1] = uri; + remote->uri_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 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_uri(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, '/'); + 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); + add_uri(remote, p); +} + +static char *default_remote_name = NULL; +static const char *current_branch = NULL; +static int current_branch_len = 0; + +static int handle_config(const char *key, const char *value) +{ + const char *name; + const char *subkey; + struct remote *remote; + if (!prefixcmp(key, "branch.") && current_branch && + !strncmp(key + 7, current_branch, current_branch_len) && + !strcmp(key + 7 + current_branch_len, ".remote")) { + free(default_remote_name); + default_remote_name = xstrdup(value); + } + 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_uri(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"); + } + 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 = head_ref + strlen("refs/heads/"); + current_branch_len = strlen(current_branch); + } + git_config(handle_config); +} + +static 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; +} + +struct remote *remote_get(const char *name) +{ + struct remote *ret; + + read_config(); + if (!name) + name = default_remote_name; + ret = make_remote(name, 0); + if (name[0] != '/') { + if (!ret->uri) + read_remotes_file(ret); + if (!ret->uri) + read_branches_file(ret); + } + if (!ret->uri) + add_uri(ret, name); + if (!ret->uri) + 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 remote_has_uri(struct remote *remote, const char *uri) +{ + int i; + for (i = 0; i < remote->uri_nr; i++) { + if (!strcmp(remote->uri[i], uri)) + return 1; + } + return 0; +} + +int remote_find_tracking(struct remote *remote, struct refspec *refspec) +{ + int i; + for (i = 0; i < remote->fetch_refspec_nr; i++) { + struct refspec *fetch = &remote->fetch[i]; + if (!fetch->dst) + continue; + if (fetch->pattern) { + if (!prefixcmp(refspec->src, fetch->src)) { + refspec->dst = + xmalloc(strlen(fetch->dst) + + strlen(refspec->src) - + strlen(fetch->src) + 1); + strcpy(refspec->dst, fetch->dst); + strcpy(refspec->dst + strlen(fetch->dst), + refspec->src + strlen(fetch->src)); + refspec->force = fetch->force; + return 0; + } + } else { + if (!strcmp(refspec->src, fetch->src)) { + refspec->dst = xstrdup(fetch->dst); + refspec->force = fetch->force; + return 0; + } + } + } + refspec->dst = NULL; + return -1; +} + +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); + int weak_match; + + if (namelen < patlen || + memcmp(name + namelen - patlen, pattern, patlen)) + continue; + if (namelen != patlen && name[namelen - patlen - 1] != '/') + 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 link_dst_tail(struct ref *ref, struct ref ***tail) +{ + **tail = ref; + *tail = &ref->next; + **tail = NULL; +} + +static struct ref *try_explicit_object_name(const char *name) +{ + unsigned char sha1[20]; + struct ref *ref; + int len; + + if (!*name) { + ref = xcalloc(1, sizeof(*ref) + 20); + strcpy(ref->name, "(delete)"); + hashclr(ref->new_sha1); + return ref; + } + if (get_sha1(name, sha1)) + return NULL; + len = strlen(name) + 1; + ref = xcalloc(1, sizeof(*ref) + len); + memcpy(ref->name, name, len); + hashcpy(ref->new_sha1, sha1); + return ref; +} + +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++) { + struct ref *matched_src, *matched_dst; + + const char *dst_value = rs[i].dst; + + if (rs[i].pattern) + continue; + + if (dst_value == NULL) + dst_value = rs[i].src; + + matched_src = matched_dst = NULL; + switch (count_refspec_match(rs[i].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[i].src); + if (matched_src) + break; + errs = 1; + error("src refspec %s does not match any.", + rs[i].src); + break; + default: + errs = 1; + error("src refspec %s matches more than one.", + rs[i].src); + break; + } + switch (count_refspec_match(dst_value, dst, &matched_dst)) { + case 1: + break; + case 0: + if (!memcmp(dst_value, "refs/", 5)) { + int len = strlen(dst_value) + 1; + matched_dst = xcalloc(1, sizeof(*dst) + len); + memcpy(matched_dst->name, dst_value, len); + link_dst_tail(matched_dst, dst_tail); + } + else if (!strcmp(rs[i].src, dst_value) && + matched_src) { + /* pushing "master:master" when + * remote does not have master yet. + */ + int len = strlen(matched_src->name) + 1; + matched_dst = xcalloc(1, sizeof(*dst) + len); + memcpy(matched_dst->name, matched_src->name, + len); + link_dst_tail(matched_dst, dst_tail); + } + else { + errs = 1; + error("dst refspec %s does not match any " + "existing ref on the remote and does " + "not start with refs/.", dst_value); + } + break; + default: + errs = 1; + error("dst refspec %s matches more than one.", + dst_value); + break; + } + if (errs) + continue; + 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[i].force; + } + } + return -errs; +} + +static struct ref *find_ref_by_name(struct ref *list, const char *name) +{ + for ( ; list; list = list->next) + if (!strcmp(list->name, name)) + return list; + return NULL; +} + +static int check_pattern_match(struct refspec *rs, int rs_nr, struct ref *src) +{ + int i; + if (!rs_nr) + return 1; + for (i = 0; i < rs_nr; i++) { + if (rs[i].pattern && !prefixcmp(src->name, rs[i].src)) + return 1; + } + return 0; +} + +int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail, + int nr_refspec, char **refspec, int all) +{ + struct refspec *rs = + parse_ref_spec(nr_refspec, (const char **) refspec); + + 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; + if (src->peer_ref) + continue; + if (!check_pattern_match(rs, nr_refspec, src)) + continue; + + dst_peer = find_ref_by_name(dst, src->name); + if (dst_peer && dst_peer->peer_ref) + /* We're already sending something to this ref. */ + continue; + if (!dst_peer && !nr_refspec && !all) + /* Remote doesn't have it, and we have no + * explicit pattern, and we don't have + * --all. */ + continue; + if (!dst_peer) { + /* Create a new one and link it */ + int len = strlen(src->name) + 1; + dst_peer = xcalloc(1, sizeof(*dst_peer) + len); + memcpy(dst_peer->name, src->name, len); + hashcpy(dst_peer->new_sha1, src->new_sha1); + link_dst_tail(dst_peer, dst_tail); + } + dst_peer->peer_ref = src; + } + return 0; +} |