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