| /* |
| * Copyright (c) 2005, 2006 Rene Scharfe |
| */ |
| #include "cache.h" |
| #include "commit.h" |
| #include "tar.h" |
| #include "builtin.h" |
| #include "quote.h" |
| #include "wrapper.h" |
| |
| static const char builtin_get_tar_commit_id_usage[] = |
| "git get-tar-commit-id"; |
| |
| /* ustar header + extended global header content */ |
| #define RECORDSIZE (512) |
| #define HEADERSIZE (2 * RECORDSIZE) |
| |
| int cmd_get_tar_commit_id(int argc, const char **argv UNUSED, const char *prefix) |
| { |
| char buffer[HEADERSIZE]; |
| struct ustar_header *header = (struct ustar_header *)buffer; |
| char *content = buffer + RECORDSIZE; |
| const char *comment; |
| ssize_t n; |
| long len; |
| char *end; |
| |
| BUG_ON_NON_EMPTY_PREFIX(prefix); |
| |
| if (argc != 1) |
| usage(builtin_get_tar_commit_id_usage); |
| |
| n = read_in_full(0, buffer, HEADERSIZE); |
| if (n < 0) |
| die_errno("git get-tar-commit-id: read error"); |
| if (n != HEADERSIZE) |
| die_errno("git get-tar-commit-id: EOF before reading tar header"); |
| if (header->typeflag[0] != TYPEFLAG_GLOBAL_HEADER) |
| return 1; |
| |
| len = strtol(content, &end, 10); |
| if (errno == ERANGE || end == content || len < 0) |
| return 1; |
| if (!skip_prefix(end, " comment=", &comment)) |
| return 1; |
| len -= comment - content; |
| if (len < 1 || !(len % 2) || |
| hash_algo_by_length((len - 1) / 2) == GIT_HASH_UNKNOWN) |
| return 1; |
| |
| if (write_in_full(1, comment, len) < 0) |
| die_errno("git get-tar-commit-id: write error"); |
| |
| return 0; |
| } |