diff options
Diffstat (limited to 'connect.c')
| -rw-r--r-- | connect.c | 417 |
1 files changed, 417 insertions, 0 deletions
diff --git a/connect.c b/connect.c new file mode 100644 index 0000000000..a6657b1384 --- /dev/null +++ b/connect.c @@ -0,0 +1,417 @@ +#include "cache.h" +#include "pkt-line.h" +#include "quote.h" +#include <sys/wait.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <netdb.h> + +/* + * Read all the refs from the other end + */ +struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match) +{ + *list = NULL; + for (;;) { + struct ref *ref; + unsigned char old_sha1[20]; + static char buffer[1000]; + char *name; + int len; + + len = packet_read_line(in, buffer, sizeof(buffer)); + if (!len) + break; + if (buffer[len-1] == '\n') + buffer[--len] = 0; + + if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ') + die("protocol error: expected sha/ref, got '%s'", buffer); + name = buffer + 41; + if (nr_match && !path_match(name, nr_match, match)) + continue; + ref = xcalloc(1, sizeof(*ref) + len - 40); + memcpy(ref->old_sha1, old_sha1, 20); + memcpy(ref->name, buffer + 41, len - 40); + *list = ref; + list = &ref->next; + } + return list; +} + +int get_ack(int fd, unsigned char *result_sha1) +{ + static char line[1000]; + int len = packet_read_line(fd, line, sizeof(line)); + + if (!len) + die("git-fetch-pack: expected ACK/NAK, got EOF"); + if (line[len-1] == '\n') + line[--len] = 0; + if (!strcmp(line, "NAK")) + return 0; + if (!strncmp(line, "ACK ", 3)) { + if (!get_sha1_hex(line+4, result_sha1)) + return 1; + } + die("git-fetch_pack: expected ACK/NAK, got '%s'", line); +} + +int path_match(const char *path, int nr, char **match) +{ + int i; + int pathlen = strlen(path); + + for (i = 0; i < nr; i++) { + char *s = match[i]; + int len = strlen(s); + + if (!len || len > pathlen) + continue; + if (memcmp(path + pathlen - len, s, len)) + continue; + if (pathlen > len && path[pathlen - len - 1] != '/') + continue; + *s = 0; + return 1; + } + return 0; +} + +struct refspec { + char *src; + char *dst; +}; + +static struct refspec *parse_ref_spec(int nr_refspec, char **refspec) +{ + int i; + struct refspec *rs = xmalloc(sizeof(*rs) * (nr_refspec + 1)); + for (i = 0; i < nr_refspec; i++) { + char *sp, *dp, *ep; + sp = refspec[i]; + ep = strchr(sp, ':'); + if (ep) { + dp = ep + 1; + *ep = 0; + } + else + dp = sp; + rs[i].src = sp; + rs[i].dst = dp; + } + rs[nr_refspec].src = rs[nr_refspec].dst = NULL; + return rs; +} + +static int count_refspec_match(const char *pattern, + struct ref *refs, + struct ref **matched_ref) +{ + int match; + int patlen = strlen(pattern); + + for (match = 0; refs; refs = refs->next) { + char *name = refs->name; + int namelen = strlen(name); + if (namelen < patlen || + memcmp(name + namelen - patlen, pattern, patlen)) + continue; + if (namelen != patlen && name[namelen - patlen - 1] != '/') + continue; + match++; + *matched_ref = refs; + } + 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 (get_sha1(name, sha1)) + return NULL; + len = strlen(name) + 1; + ref = xcalloc(1, sizeof(*ref) + len); + memcpy(ref->name, name, len); + memcpy(ref->new_sha1, sha1, 20); + return ref; +} + +static int match_explicit_refs(struct ref *src, struct ref *dst, + struct ref ***dst_tail, struct refspec *rs) +{ + int i, errs; + for (i = errs = 0; rs[i].src; i++) { + struct ref *matched_src, *matched_dst; + + 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. + */ + 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(rs[i].dst, dst, &matched_dst)) { + case 1: + break; + case 0: + if (!memcmp(rs[i].dst, "refs/", 5)) { + int len = strlen(rs[i].dst) + 1; + matched_dst = xcalloc(1, sizeof(*dst) + len); + memcpy(matched_dst->name, rs[i].dst, len); + link_dst_tail(matched_dst, dst_tail); + } + else if (!strcmp(rs[i].src, rs[i].dst) && + 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/.", rs[i].dst); + } + break; + default: + errs = 1; + error("dst refspec %s matches more than one.", + rs[i].dst); + 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; + } + 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; +} + +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, refspec); + + if (nr_refspec) + return match_explicit_refs(src, dst, dst_tail, rs); + + /* pick the remainder */ + for ( ; src; src = src->next) { + struct ref *dst_peer; + if (src->peer_ref) + continue; + dst_peer = find_ref_by_name(dst, src->name); + if ((dst_peer && dst_peer->peer_ref) || (!dst_peer && !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); + memcpy(dst_peer->new_sha1, src->new_sha1, 20); + link_dst_tail(dst_peer, dst_tail); + } + dst_peer->peer_ref = src; + } + return 0; +} + +enum protocol { + PROTO_LOCAL = 1, + PROTO_SSH, + PROTO_GIT, +}; + +static enum protocol get_protocol(const char *name) +{ + if (!strcmp(name, "ssh")) + return PROTO_SSH; + if (!strcmp(name, "git")) + return PROTO_GIT; + die("I don't handle protocol '%s'", name); +} + +#define STR_(s) # s +#define STR(s) STR_(s) + +static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path) +{ + int sockfd = -1; + char *colon, *end; + char *port = STR(DEFAULT_GIT_PORT); + struct addrinfo hints, *ai0, *ai; + int gai; + + if (host[0] == '[') { + end = strchr(host + 1, ']'); + if (end) { + *end = 0; + end++; + host++; + } else + end = host; + } else + end = host; + colon = strchr(end, ':'); + + if (colon) { + *colon = 0; + port = colon + 1; + } + + memset(&hints, 0, sizeof(hints)); + hints.ai_socktype = SOCK_STREAM; + hints.ai_protocol = IPPROTO_TCP; + + gai = getaddrinfo(host, port, &hints, &ai); + if (gai) + die("Unable to look up %s (%s)", host, gai_strerror(gai)); + + for (ai0 = ai; ai; ai = ai->ai_next) { + sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); + if (sockfd < 0) + continue; + if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) { + close(sockfd); + sockfd = -1; + continue; + } + break; + } + + freeaddrinfo(ai0); + + if (sockfd < 0) + die("unable to connect a socket (%s)", strerror(errno)); + + fd[0] = sockfd; + fd[1] = sockfd; + packet_write(sockfd, "%s %s\n", prog, path); + return 0; +} + +/* + * Yeah, yeah, fixme. Need to pass in the heads etc. + */ +int git_connect(int fd[2], char *url, const char *prog) +{ + char command[1024]; + char *host, *path; + char *colon; + int pipefd[2][2]; + pid_t pid; + enum protocol protocol; + + host = NULL; + path = url; + colon = strchr(url, ':'); + protocol = PROTO_LOCAL; + if (colon) { + *colon = 0; + host = url; + path = colon+1; + protocol = PROTO_SSH; + if (!memcmp(path, "//", 2)) { + char *slash = strchr(path + 2, '/'); + if (slash) { + int nr = slash - path - 2; + memmove(path, path+2, nr); + path[nr] = 0; + protocol = get_protocol(url); + host = path; + path = slash; + } + } + } + + if (protocol == PROTO_GIT) + return git_tcp_connect(fd, prog, host, path); + + if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0) + die("unable to create pipe pair for communication"); + pid = fork(); + if (!pid) { + snprintf(command, sizeof(command), "%s %s", prog, + sq_quote(path)); + dup2(pipefd[1][0], 0); + dup2(pipefd[0][1], 1); + close(pipefd[0][0]); + close(pipefd[0][1]); + close(pipefd[1][0]); + close(pipefd[1][1]); + if (protocol == PROTO_SSH) { + const char *ssh = getenv("GIT_SSH") ? : "ssh"; + const char *ssh_basename = strrchr(ssh, '/'); + if (!ssh_basename) + ssh_basename = ssh; + else + ssh_basename++; + execlp(ssh, ssh_basename, host, command, NULL); + } + else + execlp("sh", "sh", "-c", command, NULL); + die("exec failed"); + } + fd[0] = pipefd[0][0]; + fd[1] = pipefd[1][1]; + close(pipefd[0][1]); + close(pipefd[1][0]); + return pid; +} + +int finish_connect(pid_t pid) +{ + int ret; + + for (;;) { + ret = waitpid(pid, NULL, 0); + if (!ret) + break; + if (errno != EINTR) + break; + } + return ret; +} |