fetch-clone.c

   1 #include "cache.h"
   2 #include "exec_cmd.h"
   3 #include <sys/wait.h>
   4
   5 static int finish_pack(const char *pack_tmp_name, const char *me)
   6 {
   7         int pipe_fd[2];
   8         pid_t pid;
   9         char idx[PATH_MAX];
  10         char final[PATH_MAX];
  11         char hash[41];
  12         unsigned char sha1[20];
  13         char *cp;
  14         int err = 0;
  15
  16         if (pipe(pipe_fd) < 0)
  17                 die("%s: unable to set up pipe", me);
  18
  19         strcpy(idx, pack_tmp_name); /* ".git/objects/pack-XXXXXX" */
  20         cp = strrchr(idx, '/');
  21         memcpy(cp, "/pidx", 5);
  22
  23         pid = fork();
  24         if (pid < 0)
  25                 die("git-clone-pack: unable to fork off git-index-pack");
  26         if (!pid) {
  27                 close(0);
  28                 dup2(pipe_fd[1], 1);
  29                 close(pipe_fd[0]);
  30                 close(pipe_fd[1]);
  31                 execl_git_cmd("index-pack", "-o", idx, pack_tmp_name, NULL);
  32                 error("cannot exec git-index-pack <%s> <%s>",
  33                       idx, pack_tmp_name);
  34                 exit(1);
  35         }
  36         close(pipe_fd[1]);
  37         if (read(pipe_fd[0], hash, 40) != 40) {
  38                 error("%s: unable to read from git-index-pack", me);
  39                 err = 1;
  40         }
  41         close(pipe_fd[0]);
  42
  43         for (;;) {
  44                 int status, code;
  45                 int retval = waitpid(pid, &status, 0);
  46
  47                 if (retval < 0) {
  48                         if (errno == EINTR)
  49                                 continue;
  50                         error("waitpid failed (%s)", strerror(errno));
  51                         goto error_die;
  52                 }
  53                 if (WIFSIGNALED(status)) {
  54                         int sig = WTERMSIG(status);
  55                         error("git-index-pack died of signal %d", sig);
  56                         goto error_die;
  57                 }
  58                 if (!WIFEXITED(status)) {
  59                         error("git-index-pack died of unnatural causes %d",
  60                               status);
  61                         goto error_die;
  62                 }
  63                 code = WEXITSTATUS(status);
  64                 if (code) {
  65                         error("git-index-pack died with error code %d", code);
  66                         goto error_die;
  67                 }
  68                 if (err)
  69                         goto error_die;
  70                 break;
  71         }
  72         hash[40] = 0;
  73         if (get_sha1_hex(hash, sha1)) {
  74                 error("git-index-pack reported nonsense '%s'", hash);
  75                 goto error_die;
  76         }
  77         /* Now we have pack in pack_tmp_name[], and
  78          * idx in idx[]; rename them to their final names.
  79          */
  80         snprintf(final, sizeof(final),
  81                  "%s/pack/pack-%s.pack", get_object_directory(), hash);
  82         move_temp_to_file(pack_tmp_name, final);
  83         chmod(final, 0444);
  84         snprintf(final, sizeof(final),
  85                  "%s/pack/pack-%s.idx", get_object_directory(), hash);
  86         move_temp_to_file(idx, final);
  87         chmod(final, 0444);
  88         return 0;
  89
  90  error_die:
  91         unlink(idx);
  92         unlink(pack_tmp_name);
  93         exit(1);
  94 }
  95
  96 int receive_unpack_pack(int fd[2], const char *me, int quiet)
  97 {
  98         int status;
  99         pid_t pid;
 100
 101         pid = fork();
 102         if (pid < 0)
 103                 die("%s: unable to fork off git-unpack-objects", me);
 104         if (!pid) {
 105                 dup2(fd[0], 0);
 106                 close(fd[0]);
 107                 close(fd[1]);
 108                 execl_git_cmd("unpack-objects", quiet ? "-q" : NULL, NULL);
 109                 die("git-unpack-objects exec failed");
 110         }
 111         close(fd[0]);
 112         close(fd[1]);
 113         while (waitpid(pid, &status, 0) < 0) {
 114                 if (errno != EINTR)
 115                         die("waiting for git-unpack-objects: %s",
 116                             strerror(errno));
 117         }
 118         if (WIFEXITED(status)) {
 119                 int code = WEXITSTATUS(status);
 120                 if (code)
 121                         die("git-unpack-objects died with error code %d",
 122                             code);
 123                 return 0;
 124         }
 125         if (WIFSIGNALED(status)) {
 126                 int sig = WTERMSIG(status);
 127                 die("git-unpack-objects died of signal %d", sig);
 128         }
 129         die("git-unpack-objects died of unnatural causes %d", status);
 130 }
 131
 132 int receive_keep_pack(int fd[2], const char *me)
 133 {
 134         char tmpfile[PATH_MAX];
 135         int ofd, ifd;
 136
 137         ifd = fd[0];
 138         snprintf(tmpfile, sizeof(tmpfile),
 139                  "%s/pack/tmp-XXXXXX", get_object_directory());
 140         ofd = mkstemp(tmpfile);
 141         if (ofd < 0)
 142                 return error("unable to create temporary file %s", tmpfile);
 143
 144         while (1) {
 145                 char buf[8192];
 146                 ssize_t sz, wsz, pos;
 147                 sz = read(ifd, buf, sizeof(buf));
 148                 if (sz == 0)
 149                         break;
 150                 if (sz < 0) {
 151                         error("error reading pack (%s)", strerror(errno));
 152                         close(ofd);
 153                         unlink(tmpfile);
 154                         return -1;
 155                 }
 156                 pos = 0;
 157                 while (pos < sz) {
 158                         wsz = write(ofd, buf + pos, sz - pos);
 159                         if (wsz < 0) {
 160                                 error("error writing pack (%s)",
 161                                       strerror(errno));
 162                                 close(ofd);
 163                                 unlink(tmpfile);
 164                                 return -1;
 165                         }
 166                         pos += wsz;
 167                 }
 168         }
 169         close(ofd);
 170         return finish_pack(tmpfile, me);
 171 }