fetch-clone.c

   1 #include "cache.h"
   2 #include "exec_cmd.h"
   3 #include <sys/wait.h>
   4 #include <sys/time.h>
   5
   6 static int finish_pack(const char *pack_tmp_name, const char *me)
   7 {
   8         int pipe_fd[2];
   9         pid_t pid;
  10         char idx[PATH_MAX];
  11         char final[PATH_MAX];
  12         char hash[41];
  13         unsigned char sha1[20];
  14         char *cp;
  15         int err = 0;
  16
  17         if (pipe(pipe_fd) < 0)
  18                 die("%s: unable to set up pipe", me);
  19
  20         strcpy(idx, pack_tmp_name); /* ".git/objects/pack-XXXXXX" */
  21         cp = strrchr(idx, '/');
  22         memcpy(cp, "/pidx", 5);
  23
  24         pid = fork();
  25         if (pid < 0)
  26                 die("git-clone-pack: unable to fork off git-index-pack");
  27         if (!pid) {
  28                 close(0);
  29                 dup2(pipe_fd[1], 1);
  30                 close(pipe_fd[0]);
  31                 close(pipe_fd[1]);
  32                 execl_git_cmd("index-pack", "-o", idx, pack_tmp_name, NULL);
  33                 error("cannot exec git-index-pack <%s> <%s>",
  34                       idx, pack_tmp_name);
  35                 exit(1);
  36         }
  37         close(pipe_fd[1]);
  38         if (read(pipe_fd[0], hash, 40) != 40) {
  39                 error("%s: unable to read from git-index-pack", me);
  40                 err = 1;
  41         }
  42         close(pipe_fd[0]);
  43
  44         for (;;) {
  45                 int status, code;
  46                 int retval = waitpid(pid, &status, 0);
  47
  48                 if (retval < 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 int receive_unpack_pack(int fd[2], const char *me, int quiet)
  98 {
  99         int status;
 100         pid_t pid;
 101
 102         pid = fork();
 103         if (pid < 0)
 104                 die("%s: unable to fork off git-unpack-objects", me);
 105         if (!pid) {
 106                 dup2(fd[0], 0);
 107                 close(fd[0]);
 108                 close(fd[1]);
 109                 execl_git_cmd("unpack-objects", quiet ? "-q" : NULL, NULL);
 110                 die("git-unpack-objects exec failed");
 111         }
 112         close(fd[0]);
 113         close(fd[1]);
 114         while (waitpid(pid, &status, 0) < 0) {
 115                 if (errno != EINTR)
 116                         die("waiting for git-unpack-objects: %s",
 117                             strerror(errno));
 118         }
 119         if (WIFEXITED(status)) {
 120                 int code = WEXITSTATUS(status);
 121                 if (code)
 122                         die("git-unpack-objects died with error code %d",
 123                             code);
 124                 return 0;
 125         }
 126         if (WIFSIGNALED(status)) {
 127                 int sig = WTERMSIG(status);
 128                 die("git-unpack-objects died of signal %d", sig);
 129         }
 130         die("git-unpack-objects died of unnatural causes %d", status);
 131 }
 132
 133 /*
 134  * We average out the download speed over this many "events", where
 135  * an event is a minimum of about half a second. That way, we get
 136  * a reasonably stable number.
 137  */
 138 #define NR_AVERAGE (4)
 139
 140 /*
 141  * A "binary msec" is a power-of-two-msec, aka 1/1024th of a second.
 142  * Keeing the time in that format means that "bytes / msecs" means
 143  * is the same as kB/s (modulo rounding).
 144  *
 145  * 1000512 is a magic number (usecs in a second, rounded up by half
 146  * of 1024, to make "rounding" come out right ;)
 147  */
 148 #define usec_to_binarymsec(x) ((int)(x) / (1000512 >> 10))
 149
 150 int receive_keep_pack(int fd[2], const char *me, int quiet)
 151 {
 152         char tmpfile[PATH_MAX];
 153         int ofd, ifd;
 154         unsigned long total;
 155         static struct timeval prev_tv;
 156         struct average {
 157                 unsigned long bytes;
 158                 unsigned long time;
 159         } download[NR_AVERAGE] = { {0, 0}, };
 160         unsigned long avg_bytes, avg_time;
 161         int idx = 0;
 162
 163         ifd = fd[0];
 164         snprintf(tmpfile, sizeof(tmpfile),
 165                  "%s/pack/tmp-XXXXXX", get_object_directory());
 166         ofd = mkstemp(tmpfile);
 167         if (ofd < 0)
 168                 return error("unable to create temporary file %s", tmpfile);
 169
 170         gettimeofday(&prev_tv, NULL);
 171         total = 0;
 172         avg_bytes = 0;
 173         avg_time = 0;
 174         while (1) {
 175                 char buf[8192];
 176                 ssize_t sz, wsz, pos;
 177                 sz = read(ifd, buf, sizeof(buf));
 178                 if (sz == 0)
 179                         break;
 180                 if (sz < 0) {
 181                         if (errno != EINTR && errno != EAGAIN) {
 182                                 error("error reading pack (%s)", strerror(errno));
 183                                 close(ofd);
 184                                 unlink(tmpfile);
 185                                 return -1;
 186                         }
 187                         sz = 0;
 188                 }
 189                 pos = 0;
 190                 while (pos < sz) {
 191                         wsz = write(ofd, buf + pos, sz - pos);
 192                         if (wsz < 0) {
 193                                 error("error writing pack (%s)",
 194                                       strerror(errno));
 195                                 close(ofd);
 196                                 unlink(tmpfile);
 197                                 return -1;
 198                         }
 199                         pos += wsz;
 200                 }
 201                 total += sz;
 202                 if (!quiet) {
 203                         static unsigned long last;
 204                         struct timeval tv;
 205                         unsigned long diff = total - last;
 206                         /* not really "msecs", but a power-of-two millisec (1/1024th of a sec) */
 207                         unsigned long msecs;
 208
 209                         gettimeofday(&tv, NULL);
 210                         msecs = tv.tv_sec - prev_tv.tv_sec;
 211                         msecs <<= 10;
 212                         msecs += usec_to_binarymsec(tv.tv_usec - prev_tv.tv_usec);
 213
 214                         if (msecs > 500) {
 215                                 prev_tv = tv;
 216                                 last = total;
 217
 218                                 /* Update averages ..*/
 219                                 avg_bytes += diff;
 220                                 avg_time += msecs;
 221                                 avg_bytes -= download[idx].bytes;
 222                                 avg_time -= download[idx].time;
 223                                 download[idx].bytes = diff;
 224                                 download[idx].time = msecs;
 225                                 idx++;
 226                                 if (idx >= NR_AVERAGE)
 227                                         idx = 0;
 228
 229                                 fprintf(stderr, "%4lu.%03luMB  (%lu kB/s)      \r",
 230                                         total >> 20,
 231                                         1000*((total >> 10) & 1023)>>10,
 232                                         avg_bytes / avg_time );
 233                         }
 234                 }
 235         }
 236         close(ofd);
 237         return finish_pack(tmpfile, me);
 238 }