freshlybakedca.ke
Git fork
1/*
2 * Copyright (c) 2005, 2006 Rene Scharfe
3 */
4#include "builtin.h"
5#include "commit.h"
6#include "tar.h"
7
8static const char builtin_get_tar_commit_id_usage[] =
9"git get-tar-commit-id";
10
11/* ustar header + extended global header content */
12#define RECORDSIZE (512)
13#define HEADERSIZE (2 * RECORDSIZE)
14
15int cmd_get_tar_commit_id(int argc,
16 const char **argv,
17 const char *prefix,
18 struct repository *repo UNUSED)
19{
20 char buffer[HEADERSIZE];
21 struct ustar_header *header = (struct ustar_header *)buffer;
22 char *content = buffer + RECORDSIZE;
23 const char *comment;
24 ssize_t n;
25 long len;
26 char *end;
27
28 BUG_ON_NON_EMPTY_PREFIX(prefix);
29
30 show_usage_if_asked(argc, argv, builtin_get_tar_commit_id_usage);
31
32 if (argc != 1)
33 usage(builtin_get_tar_commit_id_usage);
34
35 n = read_in_full(0, buffer, HEADERSIZE);
36 if (n < 0)
37 die_errno("git get-tar-commit-id: read error");
38 if (n != HEADERSIZE)
39 die_errno("git get-tar-commit-id: EOF before reading tar header");
40 if (header->typeflag[0] != TYPEFLAG_GLOBAL_HEADER)
41 return 1;
42
43 errno = 0;
44 len = strtol(content, &end, 10);
45 if (errno == ERANGE || end == content || len < 0)
46 return 1;
47 if (!skip_prefix(end, " comment=", &comment))
48 return 1;
49 len -= comment - content;
50 if (len < 1 || !(len % 2) ||
51 hash_algo_by_length((len - 1) / 2) == GIT_HASH_UNKNOWN)
52 return 1;
53
54 if (write_in_full(1, comment, len) < 0)
55 die_errno("git get-tar-commit-id: write error");
56
57 return 0;
58}