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