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