builtin/unpack-file.c

   1 #include "builtin.h"
   2 #include "config.h"
   3 #include "hex.h"
   4 #include "object-name.h"
   5 #include "object-store.h"
   6 #include "wrapper.h"
   7
   8 static char *create_temp_file(struct object_id *oid)
   9 {
  10         static char path[50];
  11         void *buf;
  12         enum object_type type;
  13         unsigned long size;
  14         int fd;
  15
  16         buf = repo_read_object_file(the_repository, oid, &type, &size);
  17         if (!buf || type != OBJ_BLOB)
  18                 die("unable to read blob object %s", oid_to_hex(oid));
  19
  20         xsnprintf(path, sizeof(path), ".merge_file_XXXXXX");
  21         fd = xmkstemp(path);
  22         if (write_in_full(fd, buf, size) < 0)
  23                 die_errno("unable to write temp-file");
  24         close(fd);
  25         free(buf);
  26         return path;
  27 }
  28
  29 int cmd_unpack_file(int argc, const char **argv, const char *prefix UNUSED)
  30 {
  31         struct object_id oid;
  32
  33         if (argc != 2 || !strcmp(argv[1], "-h"))
  34                 usage("git unpack-file <blob>");
  35         if (repo_get_oid(the_repository, argv[1], &oid))
  36                 die("Not a valid object name %s", argv[1]);
  37
  38         git_config(git_default_config, NULL);
  39
  40         puts(create_temp_file(&oid));
  41         return 0;
  42 }