| 1 | #define USE_THE_REPOSITORY_VARIABLE |
| 2 | #define DISABLE_SIGN_COMPARE_WARNINGS |
| 3 | |
| 4 | #include "builtin.h" |
| 5 | #include "gettext.h" |
| 6 | #include "hash.h" |
| 7 | #include "hex.h" |
| 8 | #include "pack.h" |
| 9 | #include "parse-options.h" |
| 10 | |
| 11 | static const char *const show_index_usage[] = { |
| 12 | "git show-index [--object-format=<hash-algorithm>] < <pack-idx-file>", |
| 13 | NULL |
| 14 | }; |
| 15 | |
| 16 | int cmd_show_index(int argc, |
| 17 | const char **argv, |
| 18 | const char *prefix, |
| 19 | struct repository *repo UNUSED) |
| 20 | { |
| 21 | int i; |
| 22 | unsigned nr; |
| 23 | unsigned int version; |
| 24 | static unsigned int top_index[256]; |
| 25 | unsigned hashsz; |
| 26 | const char *hash_name = NULL; |
| 27 | int hash_algo; |
| 28 | const struct option show_index_options[] = { |
| 29 | OPT_STRING(0, "object-format", &hash_name, N_("hash-algorithm"), |
| 30 | N_("specify the hash algorithm to use")), |
| 31 | OPT_END() |
| 32 | }; |
| 33 | |
| 34 | argc = parse_options(argc, argv, prefix, show_index_options, show_index_usage, 0); |
| 35 | |
| 36 | if (hash_name) { |
| 37 | hash_algo = hash_algo_by_name(hash_name); |
| 38 | if (hash_algo == GIT_HASH_UNKNOWN) |
| 39 | die(_("Unknown hash algorithm")); |
| 40 | repo_set_hash_algo(the_repository, hash_algo); |
| 41 | } |
| 42 | |
| 43 | /* |
| 44 | * Fallback to SHA1 if we are running outside of a repository. |
| 45 | * |
| 46 | * TODO: If a future implementation of index file version encodes the hash |
| 47 | * algorithm in its header, enable show-index to infer it from the |
| 48 | * header rather than relying on repository context or a default fallback. |
| 49 | */ |
| 50 | if (!the_hash_algo) { |
| 51 | warning(_("assuming SHA-1; use --object-format to override")); |
| 52 | repo_set_hash_algo(the_repository, GIT_HASH_DEFAULT); |
| 53 | } |
| 54 | |
| 55 | hashsz = the_hash_algo->rawsz; |
| 56 | |
| 57 | if (fread(top_index, 2 * 4, 1, stdin) != 1) |
| 58 | die(_("unable to read header")); |
| 59 | if (top_index[0] == htonl(PACK_IDX_SIGNATURE)) { |
| 60 | version = ntohl(top_index[1]); |
| 61 | if (version < 2 || version > 2) |
| 62 | die(_("unknown index version")); |
| 63 | if (fread(top_index, 256 * 4, 1, stdin) != 1) |
| 64 | die(_("unable to read index")); |
| 65 | } else { |
| 66 | version = 1; |
| 67 | if (fread(&top_index[2], 254 * 4, 1, stdin) != 1) |
| 68 | die(_("unable to read index")); |
| 69 | } |
| 70 | nr = 0; |
| 71 | for (i = 0; i < 256; i++) { |
| 72 | unsigned n = ntohl(top_index[i]); |
| 73 | if (n < nr) |
| 74 | die(_("corrupt index file")); |
| 75 | nr = n; |
| 76 | } |
| 77 | if (version == 1) { |
| 78 | for (i = 0; i < nr; i++) { |
| 79 | unsigned int offset, entry[(GIT_MAX_RAWSZ + 4) / sizeof(unsigned int)]; |
| 80 | |
| 81 | if (fread(entry, 4 + hashsz, 1, stdin) != 1) |
| 82 | die(_("unable to read entry %u/%u"), i, nr); |
| 83 | offset = ntohl(entry[0]); |
| 84 | printf("%u %s\n", offset, hash_to_hex((void *)(entry+1))); |
| 85 | } |
| 86 | } else { |
| 87 | unsigned off64_nr = 0; |
| 88 | struct { |
| 89 | struct object_id oid; |
| 90 | uint32_t crc; |
| 91 | uint32_t off; |
| 92 | } *entries; |
| 93 | ALLOC_ARRAY(entries, nr); |
| 94 | for (i = 0; i < nr; i++) { |
| 95 | if (fread(entries[i].oid.hash, hashsz, 1, stdin) != 1) |
| 96 | die(_("unable to read sha1 %u/%u"), i, nr); |
| 97 | entries[i].oid.algo = hash_algo_by_ptr(the_hash_algo); |
| 98 | } |
| 99 | for (i = 0; i < nr; i++) |
| 100 | if (fread(&entries[i].crc, 4, 1, stdin) != 1) |
| 101 | die(_("unable to read crc %u/%u"), i, nr); |
| 102 | for (i = 0; i < nr; i++) |
| 103 | if (fread(&entries[i].off, 4, 1, stdin) != 1) |
| 104 | die(_("unable to read 32b offset %u/%u"), i, nr); |
| 105 | for (i = 0; i < nr; i++) { |
| 106 | uint64_t offset; |
| 107 | uint32_t off = ntohl(entries[i].off); |
| 108 | if (!(off & 0x80000000)) { |
| 109 | offset = off; |
| 110 | } else { |
| 111 | uint32_t off64[2]; |
| 112 | if ((off & 0x7fffffff) != off64_nr) |
| 113 | die(_("inconsistent 64b offset index")); |
| 114 | if (fread(off64, 8, 1, stdin) != 1) |
| 115 | die(_("unable to read 64b offset %u"), off64_nr); |
| 116 | offset = (((uint64_t)ntohl(off64[0])) << 32) | |
| 117 | ntohl(off64[1]); |
| 118 | off64_nr++; |
| 119 | } |
| 120 | printf("%" PRIuMAX " %s (%08"PRIx32")\n", |
| 121 | (uintmax_t) offset, |
| 122 | oid_to_hex(&entries[i].oid), |
| 123 | ntohl(entries[i].crc)); |
| 124 | } |
| 125 | free(entries); |
| 126 | } |
| 127 | return 0; |
| 128 | } |