fetch-clone.c

   1 #include "cache.h"
   2 #include "exec_cmd.h"
   3 #include "pkt-line.h"
   4 #include <sys/wait.h>
   5 #include <sys/time.h>
   6
   7 static int finish_pack(const char *pack_tmp_name, const char *me)
   8 {
   9         int pipe_fd[2];
  10         pid_t pid;
  11         char idx[PATH_MAX];
  12         char final[PATH_MAX];
  13         char hash[41];
  14         unsigned char sha1[20];
  15         char *cp;
  16         int err = 0;
  17
  18         if (pipe(pipe_fd) < 0)
  19                 die("%s: unable to set up pipe", me);
  20
  21         strcpy(idx, pack_tmp_name); /* ".git/objects/pack-XXXXXX" */
  22         cp = strrchr(idx, '/');
  23         memcpy(cp, "/pidx", 5);
  24
  25         pid = fork();
  26         if (pid < 0)
  27                 die("%s: unable to fork off git-index-pack", me);
  28         if (!pid) {
  29                 close(0);
  30                 dup2(pipe_fd[1], 1);
  31                 close(pipe_fd[0]);
  32                 close(pipe_fd[1]);
  33                 execl_git_cmd("index-pack", "-o", idx, pack_tmp_name, NULL);
  34                 error("cannot exec git-index-pack <%s> <%s>",
  35                       idx, pack_tmp_name);
  36                 exit(1);
  37         }
  38         close(pipe_fd[1]);
  39         if (read(pipe_fd[0], hash, 40) != 40) {
  40                 error("%s: unable to read from git-index-pack", me);
  41                 err = 1;
  42         }
  43         close(pipe_fd[0]);
  44
  45         for (;;) {
  46                 int status, code;
  47                 int retval = waitpid(pid, &status, 0);
  48
  49                 if (retval < 0) {
  50                         if (errno == EINTR)
  51                                 continue;
  52                         error("waitpid failed (%s)", strerror(errno));
  53                         goto error_die;
  54                 }
  55                 if (WIFSIGNALED(status)) {
  56                         int sig = WTERMSIG(status);
  57                         error("git-index-pack died of signal %d", sig);
  58                         goto error_die;
  59                 }
  60                 if (!WIFEXITED(status)) {
  61                         error("git-index-pack died of unnatural causes %d",
  62                               status);
  63                         goto error_die;
  64                 }
  65                 code = WEXITSTATUS(status);
  66                 if (code) {
  67                         error("git-index-pack died with error code %d", code);
  68                         goto error_die;
  69                 }
  70                 if (err)
  71                         goto error_die;
  72                 break;
  73         }
  74         hash[40] = 0;
  75         if (get_sha1_hex(hash, sha1)) {
  76                 error("git-index-pack reported nonsense '%s'", hash);
  77                 goto error_die;
  78         }
  79         /* Now we have pack in pack_tmp_name[], and
  80          * idx in idx[]; rename them to their final names.
  81          */
  82         snprintf(final, sizeof(final),
  83                  "%s/pack/pack-%s.pack", get_object_directory(), hash);
  84         move_temp_to_file(pack_tmp_name, final);
  85         chmod(final, 0444);
  86         snprintf(final, sizeof(final),
  87                  "%s/pack/pack-%s.idx", get_object_directory(), hash);
  88         move_temp_to_file(idx, final);
  89         chmod(final, 0444);
  90         return 0;
  91
  92  error_die:
  93         unlink(idx);
  94         unlink(pack_tmp_name);
  95         exit(1);
  96 }
  97
  98 static pid_t setup_sideband(int sideband, const char *me, int fd[2], int xd[2])
  99 {
 100         pid_t side_pid;
 101
 102         if (!sideband) {
 103                 fd[0] = xd[0];
 104                 fd[1] = xd[1];
 105                 return 0;
 106         }
 107         /* xd[] is talking with upload-pack; subprocess reads from
 108          * xd[0], spits out band#2 to stderr, and feeds us band#1
 109          * through our fd[0].
 110          */
 111         if (pipe(fd) < 0)
 112                 die("%s: unable to set up pipe", me);
 113         side_pid = fork();
 114         if (side_pid < 0)
 115                 die("%s: unable to fork off sideband demultiplexer", me);
 116         if (!side_pid) {
 117                 /* subprocess */
 118                 close(fd[0]);
 119                 if (xd[0] != xd[1])
 120                         close(xd[1]);
 121                 while (1) {
 122                         char buf[1024];
 123                         int len = packet_read_line(xd[0], buf, sizeof(buf));
 124                         if (len == 0)
 125                                 break;
 126                         if (len < 1)
 127                                 die("%s: protocol error: no band designator",
 128                                     me);
 129                         len--;
 130                         switch (buf[0] & 0xFF) {
 131                         case 3:
 132                                 safe_write(2, "remote: ", 8);
 133                                 safe_write(2, buf+1, len);
 134                                 safe_write(2, "\n", 1);
 135                                 exit(1);
 136                         case 2:
 137                                 safe_write(2, "remote: ", 8);
 138                                 safe_write(2, buf+1, len);
 139                                 continue;
 140                         case 1:
 141                                 safe_write(fd[1], buf+1, len);
 142                                 continue;
 143                         default:
 144                                 die("%s: protocol error: bad band #%d",
 145                                     me, (buf[0] & 0xFF));
 146                         }
 147                 }
 148                 exit(0);
 149         }
 150         close(xd[0]);
 151         close(fd[1]);
 152         fd[1] = xd[1];
 153         return side_pid;
 154 }
 155
 156 int receive_unpack_pack(int xd[2], const char *me, int quiet, int sideband)
 157 {
 158         int status;
 159         pid_t pid, side_pid;
 160         int fd[2];
 161
 162         side_pid = setup_sideband(sideband, me, fd, xd);
 163         pid = fork();
 164         if (pid < 0)
 165                 die("%s: unable to fork off git-unpack-objects", me);
 166         if (!pid) {
 167                 dup2(fd[0], 0);
 168                 close(fd[0]);
 169                 close(fd[1]);
 170                 execl_git_cmd("unpack-objects", quiet ? "-q" : NULL, NULL);
 171                 die("git-unpack-objects exec failed");
 172         }
 173         close(fd[0]);
 174         close(fd[1]);
 175         while (waitpid(pid, &status, 0) < 0) {
 176                 if (errno != EINTR)
 177                         die("waiting for git-unpack-objects: %s",
 178                             strerror(errno));
 179         }
 180         if (WIFEXITED(status)) {
 181                 int code = WEXITSTATUS(status);
 182                 if (code)
 183                         die("git-unpack-objects died with error code %d",
 184                             code);
 185                 return 0;
 186         }
 187         if (WIFSIGNALED(status)) {
 188                 int sig = WTERMSIG(status);
 189                 die("git-unpack-objects died of signal %d", sig);
 190         }
 191         die("git-unpack-objects died of unnatural causes %d", status);
 192 }
 193
 194 /*
 195  * We average out the download speed over this many "events", where
 196  * an event is a minimum of about half a second. That way, we get
 197  * a reasonably stable number.
 198  */
 199 #define NR_AVERAGE (4)
 200
 201 /*
 202  * A "binary msec" is a power-of-two-msec, aka 1/1024th of a second.
 203  * Keeping the time in that format means that "bytes / msecs" means
 204  * the same as kB/s (modulo rounding).
 205  *
 206  * 1000512 is a magic number (usecs in a second, rounded up by half
 207  * of 1024, to make "rounding" come out right ;)
 208  */
 209 #define usec_to_binarymsec(x) ((int)(x) / (1000512 >> 10))
 210
 211 int receive_keep_pack(int xd[2], const char *me, int quiet, int sideband)
 212 {
 213         char tmpfile[PATH_MAX];
 214         int ofd, ifd, fd[2];
 215         unsigned long total;
 216         static struct timeval prev_tv;
 217         struct average {
 218                 unsigned long bytes;
 219                 unsigned long time;
 220         } download[NR_AVERAGE] = { {0, 0}, };
 221         unsigned long avg_bytes, avg_time;
 222         int idx = 0;
 223
 224         setup_sideband(sideband, me, fd, xd);
 225
 226         ifd = fd[0];
 227         snprintf(tmpfile, sizeof(tmpfile),
 228                  "%s/pack/tmp-XXXXXX", get_object_directory());
 229         ofd = mkstemp(tmpfile);
 230         if (ofd < 0)
 231                 return error("unable to create temporary file %s", tmpfile);
 232
 233         gettimeofday(&prev_tv, NULL);
 234         total = 0;
 235         avg_bytes = 0;
 236         avg_time = 0;
 237         while (1) {
 238                 char buf[8192];
 239                 ssize_t sz, wsz, pos;
 240                 sz = read(ifd, buf, sizeof(buf));
 241                 if (sz == 0)
 242                         break;
 243                 if (sz < 0) {
 244                         if (errno != EINTR && errno != EAGAIN) {
 245                                 error("error reading pack (%s)", strerror(errno));
 246                                 close(ofd);
 247                                 unlink(tmpfile);
 248                                 return -1;
 249                         }
 250                         sz = 0;
 251                 }
 252                 pos = 0;
 253                 while (pos < sz) {
 254                         wsz = write(ofd, buf + pos, sz - pos);
 255                         if (wsz < 0) {
 256                                 error("error writing pack (%s)",
 257                                       strerror(errno));
 258                                 close(ofd);
 259                                 unlink(tmpfile);
 260                                 return -1;
 261                         }
 262                         pos += wsz;
 263                 }
 264                 total += sz;
 265                 if (!quiet) {
 266                         static unsigned long last;
 267                         struct timeval tv;
 268                         unsigned long diff = total - last;
 269                         /* not really "msecs", but a power-of-two millisec (1/1024th of a sec) */
 270                         unsigned long msecs;
 271
 272                         gettimeofday(&tv, NULL);
 273                         msecs = tv.tv_sec - prev_tv.tv_sec;
 274                         msecs <<= 10;
 275                         msecs += usec_to_binarymsec(tv.tv_usec - prev_tv.tv_usec);
 276
 277                         if (msecs > 500) {
 278                                 prev_tv = tv;
 279                                 last = total;
 280
 281                                 /* Update averages ..*/
 282                                 avg_bytes += diff;
 283                                 avg_time += msecs;
 284                                 avg_bytes -= download[idx].bytes;
 285                                 avg_time -= download[idx].time;
 286                                 download[idx].bytes = diff;
 287                                 download[idx].time = msecs;
 288                                 idx++;
 289                                 if (idx >= NR_AVERAGE)
 290                                         idx = 0;
 291
 292                                 fprintf(stderr, "%4lu.%03luMB  (%lu kB/s)      \r",
 293                                         total >> 20,
 294                                         1000*((total >> 10) & 1023)>>10,
 295                                         avg_bytes / avg_time );
 296                         }
 297                 }
 298         }
 299         close(ofd);
 300         return finish_pack(tmpfile, me);
 301 }