Andrew's git - gitweb.git/blob

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