Andrew's git / gitweb.git /
878254d72f6448ff3a6cfb59650ef9a71d75ddde
   1#include "cache.h"
   2#include "refs.h"
   3#include "pkt-line.h"
   4#include "tag.h"
   5#include "object.h"
   6
   7static const char upload_pack_usage[] = "git-upload-pack [--strict] [--timeout=nn] <dir>";
   8
   9#define OUR_REF (1U << 1)
  10#define WANTED (1U << 2)
  11#define MAX_HAS 256
  12#define MAX_NEEDS 256
  13static int nr_has = 0, nr_needs = 0, nr_our_refs = 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        int create_full_pack = (nr_our_refs == nr_needs && !nr_has);
  35
  36        if (pipe(fd) < 0)
  37                die("git-upload-pack: unable to create pipe");
  38        pid = fork();
  39        if (pid < 0)
  40                die("git-upload-pack: unable to fork git-rev-list");
  41
  42        if (!pid) {
  43                int i;
  44                int args;
  45                char **argv;
  46                char *buf;
  47                char **p;
  48
  49                if (create_full_pack)
  50                        args = 10;
  51                else
  52                        args = nr_has + nr_needs + 5;
  53                argv = xmalloc(args * sizeof(char *));
  54                buf = xmalloc(args * 45);
  55                p = argv;
  56
  57                dup2(fd[1], 1);
  58                close(0);
  59                close(fd[0]);
  60                close(fd[1]);
  61                *p++ = "git-rev-list";
  62                *p++ = "--objects";
  63                if (create_full_pack || MAX_NEEDS <= nr_needs)
  64                        *p++ = "--all";
  65                else {
  66                        for (i = 0; i < nr_needs; i++) {
  67                                *p++ = buf;
  68                                memcpy(buf, sha1_to_hex(needs_sha1[i]), 41);
  69                                buf += 41;
  70                        }
  71                }
  72                if (!create_full_pack)
  73                        for (i = 0; i < nr_has; i++) {
  74                                *p++ = buf;
  75                                *buf++ = '^';
  76                                memcpy(buf, sha1_to_hex(has_sha1[i]), 41);
  77                                buf += 41;
  78                        }
  79                *p++ = NULL;
  80                execvp("git-rev-list", argv);
  81                die("git-upload-pack: unable to exec git-rev-list");
  82        }
  83        dup2(fd[0], 0);
  84        close(fd[0]);
  85        close(fd[1]);
  86        execlp("git-pack-objects", "git-pack-objects", "--stdout", NULL);
  87        die("git-upload-pack: unable to exec git-pack-objects");
  88}
  89
  90static int got_sha1(char *hex, unsigned char *sha1)
  91{
  92        int nr;
  93        if (get_sha1_hex(hex, sha1))
  94                die("git-upload-pack: expected SHA1 object, got '%s'", hex);
  95        if (!has_sha1_file(sha1))
  96                return 0;
  97        nr = nr_has;
  98        if (nr < MAX_HAS) {
  99                memcpy(has_sha1[nr], sha1, 20);
 100                nr_has = nr+1;
 101        }
 102        return 1;
 103}
 104
 105static int get_common_commits(void)
 106{
 107        static char line[1000];
 108        unsigned char sha1[20];
 109        int len;
 110
 111        for(;;) {
 112                len = packet_read_line(0, line, sizeof(line));
 113                reset_timeout();
 114
 115                if (!len) {
 116                        packet_write(1, "NAK\n");
 117                        continue;
 118                }
 119                len = strip(line, len);
 120                if (!strncmp(line, "have ", 5)) {
 121                        if (got_sha1(line+5, sha1)) {
 122                                packet_write(1, "ACK %s\n", sha1_to_hex(sha1));
 123                                break;
 124                        }
 125                        continue;
 126                }
 127                if (!strcmp(line, "done")) {
 128                        packet_write(1, "NAK\n");
 129                        return -1;
 130                }
 131                die("git-upload-pack: expected SHA1 list, got '%s'", line);
 132        }
 133
 134        for (;;) {
 135                len = packet_read_line(0, line, sizeof(line));
 136                reset_timeout();
 137                if (!len)
 138                        continue;
 139                len = strip(line, len);
 140                if (!strncmp(line, "have ", 5)) {
 141                        got_sha1(line+5, sha1);
 142                        continue;
 143                }
 144                if (!strcmp(line, "done"))
 145                        break;
 146                die("git-upload-pack: expected SHA1 list, got '%s'", line);
 147        }
 148        return 0;
 149}
 150
 151static int receive_needs(void)
 152{
 153        static char line[1000];
 154        int len, needs;
 155
 156        needs = 0;
 157        for (;;) {
 158                struct object *o;
 159                unsigned char dummy[20], *sha1_buf;
 160                len = packet_read_line(0, line, sizeof(line));
 161                reset_timeout();
 162                if (!len)
 163                        return needs;
 164
 165                sha1_buf = dummy;
 166                if (needs == MAX_NEEDS) {
 167                        fprintf(stderr,
 168                                "warning: supporting only a max of %d requests. "
 169                                "sending everything instead.\n",
 170                                MAX_NEEDS);
 171                }
 172                else if (needs < MAX_NEEDS)
 173                        sha1_buf = needs_sha1[needs];
 174
 175                if (strncmp("want ", line, 5) || get_sha1_hex(line+5, sha1_buf))
 176                        die("git-upload-pack: protocol error, "
 177                            "expected to get sha, not '%s'", line);
 178
 179                /* We have sent all our refs already, and the other end
 180                 * should have chosen out of them; otherwise they are
 181                 * asking for nonsense.
 182                 *
 183                 * Hmph.  We may later want to allow "want" line that
 184                 * asks for something like "master~10" (symbolic)...
 185                 * would it make sense?  I don't know.
 186                 */
 187                o = lookup_object(sha1_buf);
 188                if (!o || !(o->flags & OUR_REF))
 189                        die("git-upload-pack: not our ref %s", line+5);
 190                if (!(o->flags & WANTED)) {
 191                        o->flags |= WANTED;
 192                        needs++;
 193                }
 194        }
 195}
 196
 197static int send_ref(const char *refname, const unsigned char *sha1)
 198{
 199        struct object *o = parse_object(sha1);
 200
 201        packet_write(1, "%s %s\n", sha1_to_hex(sha1), refname);
 202        if (!(o->flags & OUR_REF)) {
 203                o->flags |= OUR_REF;
 204                nr_our_refs++;
 205        }
 206        if (o->type == tag_type) {
 207                o = deref_tag(o);
 208                packet_write(1, "%s %s^{}\n", sha1_to_hex(o->sha1), refname);
 209        }
 210        return 0;
 211}
 212
 213static int upload_pack(void)
 214{
 215        reset_timeout();
 216        head_ref(send_ref);
 217        for_each_ref(send_ref);
 218        packet_flush(1);
 219        nr_needs = receive_needs();
 220        if (!nr_needs)
 221                return 0;
 222        get_common_commits();
 223        create_pack_file();
 224        return 0;
 225}
 226
 227int main(int argc, char **argv)
 228{
 229        const char *dir;
 230        int i;
 231        int strict = 0;
 232
 233        for (i = 1; i < argc; i++) {
 234                char *arg = argv[i];
 235
 236                if (arg[0] != '-')
 237                        break;
 238                if (!strcmp(arg, "--strict")) {
 239                        strict = 1;
 240                        continue;
 241                }
 242                if (!strncmp(arg, "--timeout=", 10)) {
 243                        timeout = atoi(arg+10);
 244                        continue;
 245                }
 246                if (!strcmp(arg, "--")) {
 247                        i++;
 248                        break;
 249                }
 250        }
 251        
 252        if (i != argc-1)
 253                usage(upload_pack_usage);
 254        dir = argv[i];
 255
 256        /* chdir to the directory. If that fails, try appending ".git" */
 257        if (chdir(dir) < 0) {
 258                if (strict || chdir(mkpath("%s.git", dir)) < 0)
 259                        die("git-upload-pack unable to chdir to %s", dir);
 260        }
 261        if (!strict)
 262                chdir(".git");
 263
 264        if (access("objects", X_OK) || access("refs", X_OK))
 265                die("git-upload-pack: %s doesn't seem to be a git archive", dir);
 266
 267        putenv("GIT_DIR=.");
 268        upload_pack();
 269        return 0;
 270}