Andrew's git - gitweb.git/blob

660d7c40e30642002aac9a02e8eebbe1704bd42f
   1#include "cache.h"
   2#include "refs.h"
   3#include "pkt-line.h"
   4#include "tag.h"
   5#include "object.h"
   6#include "commit.h"
   7
   8static const char upload_pack_usage[] = "git-upload-pack [--strict] [--timeout=nn] <dir>";
   9
  10#define THEY_HAVE (1U << 0)
  11#define OUR_REF (1U << 1)
  12#define WANTED (1U << 2)
  13#define MAX_HAS 256
  14#define MAX_NEEDS 256
  15static int nr_has = 0, nr_needs = 0, nr_our_refs = 0;
  16static unsigned char has_sha1[MAX_HAS][20];
  17static unsigned char needs_sha1[MAX_NEEDS][20];
  18static unsigned int timeout = 0;
  19
  20static void reset_timeout(void)
  21{
  22        alarm(timeout);
  23}
  24
  25static int strip(char *line, int len)
  26{
  27        if (len && line[len-1] == '\n')
  28                line[--len] = 0;
  29        return len;
  30}
  31
  32static void create_pack_file(void)
  33{
  34        int fd[2];
  35        pid_t pid;
  36        int create_full_pack = (nr_our_refs == nr_needs && !nr_has);
  37
  38        if (pipe(fd) < 0)
  39                die("git-upload-pack: unable to create pipe");
  40        pid = fork();
  41        if (pid < 0)
  42                die("git-upload-pack: unable to fork git-rev-list");
  43
  44        if (!pid) {
  45                int i;
  46                int args;
  47                char **argv;
  48                char *buf;
  49                char **p;
  50
  51                if (create_full_pack)
  52                        args = 10;
  53                else
  54                        args = nr_has + nr_needs + 5;
  55                argv = xmalloc(args * sizeof(char *));
  56                buf = xmalloc(args * 45);
  57                p = argv;
  58
  59                dup2(fd[1], 1);
  60                close(0);
  61                close(fd[0]);
  62                close(fd[1]);
  63                *p++ = "git-rev-list";
  64                *p++ = "--objects";
  65                if (create_full_pack || MAX_NEEDS <= nr_needs)
  66                        *p++ = "--all";
  67                else {
  68                        for (i = 0; i < nr_needs; i++) {
  69                                *p++ = buf;
  70                                memcpy(buf, sha1_to_hex(needs_sha1[i]), 41);
  71                                buf += 41;
  72                        }
  73                }
  74                if (!create_full_pack)
  75                        for (i = 0; i < nr_has; i++) {
  76                                *p++ = buf;
  77                                *buf++ = '^';
  78                                memcpy(buf, sha1_to_hex(has_sha1[i]), 41);
  79                                buf += 41;
  80                        }
  81                *p++ = NULL;
  82                execvp("git-rev-list", argv);
  83                die("git-upload-pack: unable to exec git-rev-list");
  84        }
  85        dup2(fd[0], 0);
  86        close(fd[0]);
  87        close(fd[1]);
  88        execlp("git-pack-objects", "git-pack-objects", "--stdout", NULL);
  89        die("git-upload-pack: unable to exec git-pack-objects");
  90}
  91
  92static int got_sha1(char *hex, unsigned char *sha1)
  93{
  94        if (get_sha1_hex(hex, sha1))
  95                die("git-upload-pack: expected SHA1 object, got '%s'", hex);
  96        if (!has_sha1_file(sha1))
  97                return 0;
  98        if (nr_has < MAX_HAS) {
  99                struct object *o = lookup_object(sha1);
 100                if (!(o && o->parsed))
 101                        o = parse_object(sha1);
 102                if (!o)
 103                        die("oops (%s)", sha1_to_hex(sha1));
 104                if (o->type == commit_type) {
 105                        struct commit_list *parents;
 106                        if (o->flags & THEY_HAVE)
 107                                return 0;
 108                        o->flags |= THEY_HAVE;
 109                        for (parents = ((struct commit*)o)->parents;
 110                             parents;
 111                             parents = parents->next)
 112                                parents->item->object.flags |= THEY_HAVE;
 113                }
 114                memcpy(has_sha1[nr_has++], sha1, 20);
 115        }
 116        return 1;
 117}
 118
 119static int get_common_commits(void)
 120{
 121        static char line[1000];
 122        unsigned char sha1[20];
 123        int len;
 124
 125        track_object_refs = 0;
 126        save_commit_buffer = 0;
 127
 128        for(;;) {
 129                len = packet_read_line(0, line, sizeof(line));
 130                reset_timeout();
 131
 132                if (!len) {
 133                        packet_write(1, "NAK\n");
 134                        continue;
 135                }
 136                len = strip(line, len);
 137                if (!strncmp(line, "have ", 5)) {
 138                        if (got_sha1(line+5, sha1)) {
 139                                packet_write(1, "ACK %s\n", sha1_to_hex(sha1));
 140                                break;
 141                        }
 142                        continue;
 143                }
 144                if (!strcmp(line, "done")) {
 145                        packet_write(1, "NAK\n");
 146                        return -1;
 147                }
 148                die("git-upload-pack: expected SHA1 list, got '%s'", line);
 149        }
 150
 151        for (;;) {
 152                len = packet_read_line(0, line, sizeof(line));
 153                reset_timeout();
 154                if (!len)
 155                        continue;
 156                len = strip(line, len);
 157                if (!strncmp(line, "have ", 5)) {
 158                        got_sha1(line+5, sha1);
 159                        continue;
 160                }
 161                if (!strcmp(line, "done"))
 162                        break;
 163                die("git-upload-pack: expected SHA1 list, got '%s'", line);
 164        }
 165        return 0;
 166}
 167
 168static int receive_needs(void)
 169{
 170        static char line[1000];
 171        int len, needs;
 172
 173        needs = 0;
 174        for (;;) {
 175                struct object *o;
 176                unsigned char dummy[20], *sha1_buf;
 177                len = packet_read_line(0, line, sizeof(line));
 178                reset_timeout();
 179                if (!len)
 180                        return needs;
 181
 182                sha1_buf = dummy;
 183                if (needs == MAX_NEEDS) {
 184                        fprintf(stderr,
 185                                "warning: supporting only a max of %d requests. "
 186                                "sending everything instead.\n",
 187                                MAX_NEEDS);
 188                }
 189                else if (needs < MAX_NEEDS)
 190                        sha1_buf = needs_sha1[needs];
 191
 192                if (strncmp("want ", line, 5) || get_sha1_hex(line+5, sha1_buf))
 193                        die("git-upload-pack: protocol error, "
 194                            "expected to get sha, not '%s'", line);
 195
 196                /* We have sent all our refs already, and the other end
 197                 * should have chosen out of them; otherwise they are
 198                 * asking for nonsense.
 199                 *
 200                 * Hmph.  We may later want to allow "want" line that
 201                 * asks for something like "master~10" (symbolic)...
 202                 * would it make sense?  I don't know.
 203                 */
 204                o = lookup_object(sha1_buf);
 205                if (!o || !(o->flags & OUR_REF))
 206                        die("git-upload-pack: not our ref %s", line+5);
 207                if (!(o->flags & WANTED)) {
 208                        o->flags |= WANTED;
 209                        needs++;
 210                }
 211        }
 212}
 213
 214static int send_ref(const char *refname, const unsigned char *sha1)
 215{
 216        struct object *o = parse_object(sha1);
 217
 218        packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
 219        if (!(o->flags & OUR_REF)) {
 220                o->flags |= OUR_REF;
 221                nr_our_refs++;
 222        }
 223        if (o->type == tag_type) {
 224                o = deref_tag(o);
 225                packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
 226        }
 227        return 0;
 228}
 229
 230static int upload_pack(void)
 231{
 232        reset_timeout();
 233        head_ref(send_ref);
 234        for_each_ref(send_ref);
 235        packet_flush(1);
 236        nr_needs = receive_needs();
 237        if (!nr_needs)
 238                return 0;
 239        get_common_commits();
 240        create_pack_file();
 241        return 0;
 242}
 243
 244int main(int argc, char **argv)
 245{
 246        const char *dir;
 247        int i;
 248        int strict = 0;
 249
 250        for (i = 1; i < argc; i++) {
 251                char *arg = argv[i];
 252
 253                if (arg[0] != '-')
 254                        break;
 255                if (!strcmp(arg, "--strict")) {
 256                        strict = 1;
 257                        continue;
 258                }
 259                if (!strncmp(arg, "--timeout=", 10)) {
 260                        timeout = atoi(arg+10);
 261                        continue;
 262                }
 263                if (!strcmp(arg, "--")) {
 264                        i++;
 265                        break;
 266                }
 267        }
 268        
 269        if (i != argc-1)
 270                usage(upload_pack_usage);
 271        dir = argv[i];
 272
 273        /* chdir to the directory. If that fails, try appending ".git" */
 274        if (chdir(dir) < 0) {
 275                if (strict || chdir(mkpath("%s.git", dir)) < 0)
 276                        die("git-upload-pack unable to chdir to %s", dir);
 277        }
 278        if (!strict)
 279                chdir(".git");
 280
 281        if (access("objects", X_OK) || access("refs", X_OK))
 282                die("git-upload-pack: %s doesn't seem to be a git archive", dir);
 283
 284        putenv("GIT_DIR=.");
 285        upload_pack();
 286        return 0;
 287}