Andrew's git - gitweb.git/blob

c872bfd45b815d12ba87d215cc157495b6a1e4aa
   1#include "cache.h"
   2#include "pkt-line.h"
   3#include "quote.h"
   4#include <sys/wait.h>
   5#include <sys/socket.h>
   6#include <netinet/in.h>
   7#include <arpa/inet.h>
   8#include <netdb.h>
   9
  10/*
  11 * Read all the refs from the other end
  12 */
  13struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match)
  14{
  15        *list = NULL;
  16        for (;;) {
  17                struct ref *ref;
  18                unsigned char old_sha1[20];
  19                static char buffer[1000];
  20                char *name;
  21                int len;
  22
  23                len = packet_read_line(in, buffer, sizeof(buffer));
  24                if (!len)
  25                        break;
  26                if (buffer[len-1] == '\n')
  27                        buffer[--len] = 0;
  28
  29                if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
  30                        die("protocol error: expected sha/ref, got '%s'", buffer);
  31                name = buffer + 41;
  32                if (nr_match && !path_match(name, nr_match, match))
  33                        continue;
  34                ref = xcalloc(1, sizeof(*ref) + len - 40);
  35                memcpy(ref->old_sha1, old_sha1, 20);
  36                memcpy(ref->name, buffer + 41, len - 40);
  37                *list = ref;
  38                list = &ref->next;
  39        }
  40        return list;
  41}
  42
  43int get_ack(int fd, unsigned char *result_sha1)
  44{
  45        static char line[1000];
  46        int len = packet_read_line(fd, line, sizeof(line));
  47
  48        if (!len)
  49                die("git-fetch-pack: expected ACK/NAK, got EOF");
  50        if (line[len-1] == '\n')
  51                line[--len] = 0;
  52        if (!strcmp(line, "NAK"))
  53                return 0;
  54        if (!strncmp(line, "ACK ", 3)) {
  55                if (!get_sha1_hex(line+4, result_sha1))
  56                        return 1;
  57        }
  58        die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
  59}
  60
  61int path_match(const char *path, int nr, char **match)
  62{
  63        int i;
  64        int pathlen = strlen(path);
  65
  66        for (i = 0; i < nr; i++) {
  67                char *s = match[i];
  68                int len = strlen(s);
  69
  70                if (!len || len > pathlen)
  71                        continue;
  72                if (memcmp(path + pathlen - len, s, len))
  73                        continue;
  74                if (pathlen > len && path[pathlen - len - 1] != '/')
  75                        continue;
  76                *s = 0;
  77                return 1;
  78        }
  79        return 0;
  80}
  81
  82struct refspec {
  83        char *src;
  84        char *dst;
  85};
  86
  87static struct refspec *parse_ref_spec(int nr_refspec, char **refspec)
  88{
  89        int i;
  90        struct refspec *rs = xmalloc(sizeof(*rs) * (nr_refspec + 1));
  91        for (i = 0; i < nr_refspec; i++) {
  92                char *sp, *dp, *ep;
  93                sp = refspec[i];
  94                ep = strchr(sp, ':');
  95                if (ep) {
  96                        dp = ep + 1;
  97                        *ep = 0;
  98                }
  99                else
 100                        dp = sp;
 101                rs[i].src = sp;
 102                rs[i].dst = dp;
 103        }
 104        rs[nr_refspec].src = rs[nr_refspec].dst = NULL;
 105        return rs;
 106}
 107
 108static int count_refspec_match(const char *pattern,
 109                               struct ref *refs,
 110                               struct ref **matched_ref)
 111{
 112        int match;
 113        int patlen = strlen(pattern);
 114
 115        for (match = 0; refs; refs = refs->next) {
 116                char *name = refs->name;
 117                int namelen = strlen(name);
 118                if (namelen < patlen ||
 119                    memcmp(name + namelen - patlen, pattern, patlen))
 120                        continue;
 121                if (namelen != patlen && name[namelen - patlen - 1] != '/')
 122                        continue;
 123                match++;
 124                *matched_ref = refs;
 125        }
 126        return match;
 127}
 128
 129static void link_dst_tail(struct ref *ref, struct ref ***tail)
 130{
 131        **tail = ref;
 132        *tail = &ref->next;
 133        **tail = NULL;
 134}
 135
 136static int match_explicit_refs(struct ref *src, struct ref *dst,
 137                               struct ref ***dst_tail, struct refspec *rs)
 138{
 139        int i, errs;
 140        for (i = errs = 0; rs[i].src; i++) {
 141                struct ref *matched_src, *matched_dst;
 142
 143                matched_src = matched_dst = NULL;
 144                switch (count_refspec_match(rs[i].src, src, &matched_src)) {
 145                case 1:
 146                        break;
 147                case 0:
 148                        errs = 1;
 149                        error("src refspec %s does not match any.");
 150                        break;
 151                default:
 152                        errs = 1;
 153                        error("src refspec %s matches more than one.",
 154                              rs[i].src);
 155                        break;
 156                }
 157                switch (count_refspec_match(rs[i].dst, dst, &matched_dst)) {
 158                case 1:
 159                        break;
 160                case 0:
 161                        if (!memcmp(rs[i].dst, "refs/", 5)) {
 162                                int len = strlen(rs[i].dst) + 1;
 163                                matched_dst = xcalloc(1, sizeof(*dst) + len);
 164                                memcpy(matched_dst->name, rs[i].dst, len);
 165                                link_dst_tail(matched_dst, dst_tail);
 166                        }
 167                        else if (!strcmp(rs[i].src, rs[i].dst) &&
 168                                 matched_src) {
 169                                /* pushing "master:master" when
 170                                 * remote does not have master yet.
 171                                 */
 172                                int len = strlen(matched_src->name) + 1;
 173                                matched_dst = xcalloc(1, sizeof(*dst) + len);
 174                                memcpy(matched_dst->name, matched_src->name,
 175                                       len);
 176                                link_dst_tail(matched_dst, dst_tail);
 177                        }
 178                        else {
 179                                errs = 1;
 180                                error("dst refspec %s does not match any "
 181                                      "existing ref on the remote and does "
 182                                      "not start with refs/.", rs[i].dst);
 183                        }
 184                        break;
 185                default:
 186                        errs = 1;
 187                        error("dst refspec %s matches more than one.",
 188                              rs[i].dst);
 189                        break;
 190                }
 191                if (errs)
 192                        continue;
 193                if (matched_dst->peer_ref) {
 194                        errs = 1;
 195                        error("dst ref %s receives from more than one src.",
 196                              matched_dst->name);
 197                }
 198                else
 199                        matched_dst->peer_ref = matched_src;
 200        }
 201        return -errs;
 202}
 203
 204static struct ref *find_ref_by_name(struct ref *list, const char *name)
 205{
 206        for ( ; list; list = list->next)
 207                if (!strcmp(list->name, name))
 208                        return list;
 209        return NULL;
 210}
 211
 212int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
 213               int nr_refspec, char **refspec, int all)
 214{
 215        struct refspec *rs = parse_ref_spec(nr_refspec, refspec);
 216
 217        if (nr_refspec)
 218                return match_explicit_refs(src, dst, dst_tail, rs);
 219
 220        /* pick the remainder */
 221        for ( ; src; src = src->next) {
 222                struct ref *dst_peer;
 223                if (src->peer_ref)
 224                        continue;
 225                dst_peer = find_ref_by_name(dst, src->name);
 226                if ((dst_peer && dst_peer->peer_ref) || (!dst_peer && !all))
 227                        continue;
 228                if (!dst_peer) {
 229                        /* Create a new one and link it */
 230                        int len = strlen(src->name) + 1;
 231                        dst_peer = xcalloc(1, sizeof(*dst_peer) + len);
 232                        memcpy(dst_peer->name, src->name, len);
 233                        memcpy(dst_peer->new_sha1, src->new_sha1, 20);
 234                        link_dst_tail(dst_peer, dst_tail);
 235                }
 236                dst_peer->peer_ref = src;
 237        }
 238        return 0;
 239}
 240
 241enum protocol {
 242        PROTO_LOCAL = 1,
 243        PROTO_SSH,
 244        PROTO_GIT,
 245};
 246
 247static enum protocol get_protocol(const char *name)
 248{
 249        if (!strcmp(name, "ssh"))
 250                return PROTO_SSH;
 251        if (!strcmp(name, "git"))
 252                return PROTO_GIT;
 253        die("I don't handle protocol '%s'", name);
 254}
 255
 256#define STR_(s) # s
 257#define STR(s)  STR_(s)
 258
 259static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
 260{
 261        int sockfd = -1;
 262        char *colon, *end;
 263        char *port = STR(DEFAULT_GIT_PORT);
 264        struct addrinfo hints, *ai0, *ai;
 265        int gai;
 266
 267        if (host[0] == '[') {
 268                end = strchr(host + 1, ']');
 269                if (end) {
 270                        *end = 0;
 271                        end++;
 272                        host++;
 273                } else
 274                        end = host;
 275        } else
 276                end = host;
 277        colon = strchr(end, ':');
 278
 279        if (colon) {
 280                *colon = 0;
 281                port = colon + 1;
 282        }
 283
 284        memset(&hints, 0, sizeof(hints));
 285        hints.ai_socktype = SOCK_STREAM;
 286        hints.ai_protocol = IPPROTO_TCP;
 287
 288        gai = getaddrinfo(host, port, &hints, &ai);
 289        if (gai)
 290                die("Unable to look up %s (%s)", host, gai_strerror(gai));
 291
 292        for (ai0 = ai; ai; ai = ai->ai_next) {
 293                sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
 294                if (sockfd < 0)
 295                        continue;
 296                if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
 297                        close(sockfd);
 298                        sockfd = -1;
 299                        continue;
 300                }
 301                break;
 302        }
 303
 304        freeaddrinfo(ai0);
 305
 306        if (sockfd < 0)
 307                die("unable to connect a socket (%s)", strerror(errno));
 308
 309        fd[0] = sockfd;
 310        fd[1] = sockfd;
 311        packet_write(sockfd, "%s %s\n", prog, path);
 312        return 0;
 313}
 314
 315/*
 316 * Yeah, yeah, fixme. Need to pass in the heads etc.
 317 */
 318int git_connect(int fd[2], char *url, const char *prog)
 319{
 320        char command[1024];
 321        char *host, *path;
 322        char *colon;
 323        int pipefd[2][2];
 324        pid_t pid;
 325        enum protocol protocol;
 326
 327        host = NULL;
 328        path = url;
 329        colon = strchr(url, ':');
 330        protocol = PROTO_LOCAL;
 331        if (colon) {
 332                *colon = 0;
 333                host = url;
 334                path = colon+1;
 335                protocol = PROTO_SSH;
 336                if (!memcmp(path, "//", 2)) {
 337                        char *slash = strchr(path + 2, '/');
 338                        if (slash) {
 339                                int nr = slash - path - 2;
 340                                memmove(path, path+2, nr);
 341                                path[nr] = 0;
 342                                protocol = get_protocol(url);
 343                                host = path;
 344                                path = slash;
 345                        }
 346                }
 347        }
 348
 349        if (protocol == PROTO_GIT)
 350                return git_tcp_connect(fd, prog, host, path);
 351
 352        if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
 353                die("unable to create pipe pair for communication");
 354        pid = fork();
 355        if (!pid) {
 356                snprintf(command, sizeof(command), "%s %s", prog,
 357                         sq_quote(path));
 358                dup2(pipefd[1][0], 0);
 359                dup2(pipefd[0][1], 1);
 360                close(pipefd[0][0]);
 361                close(pipefd[0][1]);
 362                close(pipefd[1][0]);
 363                close(pipefd[1][1]);
 364                if (protocol == PROTO_SSH)
 365                        execlp("ssh", "ssh", host, command, NULL);
 366                else
 367                        execlp("sh", "sh", "-c", command, NULL);
 368                die("exec failed");
 369        }               
 370        fd[0] = pipefd[0][0];
 371        fd[1] = pipefd[1][1];
 372        close(pipefd[0][1]);
 373        close(pipefd[1][0]);
 374        return pid;
 375}
 376
 377int finish_connect(pid_t pid)
 378{
 379        int ret;
 380
 381        for (;;) {
 382                ret = waitpid(pid, NULL, 0);
 383                if (!ret)
 384                        break;
 385                if (errno != EINTR)
 386                        break;
 387        }
 388        return ret;
 389}