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Commit | Line | Data |
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c2e86add | 1 | #include "builtin.h" |
8e440259 | 2 | #include "tag.h" |
47f351e9 | 3 | #include "replace-object.h" |
cbd53a21 | 4 | #include "object-store.h" |
ec4465ad LT |
5 | |
6 | /* | |
446c6fae RJ |
7 | * A signature file has a very simple fixed format: four lines |
8 | * of "object <sha1>" + "type <typename>" + "tag <tagname>" + | |
9 | * "tagger <committer>", followed by a blank line, a free-form tag | |
10 | * message and a signature block that git itself doesn't care about, | |
11 | * but that can be verified with gpg or similar. | |
ec4465ad | 12 | * |
e0aaf781 | 13 | * The first four lines are guaranteed to be at least 83 bytes: |
ec4465ad | 14 | * "object <sha1>\n" is 48 bytes, "type tag\n" at 9 bytes is the |
e0aaf781 BC |
15 | * shortest possible type-line, "tag .\n" at 6 bytes is the shortest |
16 | * single-character-tag line, and "tagger . <> 0 +0000\n" at 20 bytes is | |
17 | * the shortest possible tagger-line. | |
ec4465ad LT |
18 | */ |
19 | ||
ec4465ad LT |
20 | /* |
21 | * We refuse to tag something we can't verify. Just because. | |
22 | */ | |
eedc994f | 23 | static int verify_object(const struct object_id *oid, const char *expected_type) |
ec4465ad LT |
24 | { |
25 | int ret = -1; | |
21666f1a | 26 | enum object_type type; |
91d7b8af | 27 | unsigned long size; |
b4f5aca4 | 28 | void *buffer = read_object_file(oid, &type, &size); |
1f2e7cea | 29 | const struct object_id *repl = lookup_replace_object(the_repository, oid); |
ec4465ad | 30 | |
91d7b8af | 31 | if (buffer) { |
21666f1a | 32 | if (type == type_from_string(expected_type)) |
b383a13c | 33 | ret = check_object_signature(repl, buffer, size, expected_type); |
91d7b8af | 34 | free(buffer); |
ec4465ad LT |
35 | } |
36 | return ret; | |
37 | } | |
38 | ||
39 | static int verify_tag(char *buffer, unsigned long size) | |
40 | { | |
41 | int typelen; | |
42 | char type[20]; | |
eedc994f | 43 | struct object_id oid; |
44 | const char *object, *type_line, *tag_line, *tagger_line, *lb, *rb, *p; | |
ba26ab99 | 45 | size_t len; |
ec4465ad | 46 | |
e0aaf781 | 47 | if (size < 84) |
446c6fae | 48 | return error("wanna fool me ? you obviously got the size wrong !"); |
cfba0459 | 49 | |
ec4465ad LT |
50 | buffer[size] = 0; |
51 | ||
52 | /* Verify object line */ | |
53 | object = buffer; | |
54 | if (memcmp(object, "object ", 7)) | |
446c6fae | 55 | return error("char%d: does not start with \"object \"", 0); |
cfba0459 | 56 | |
eedc994f | 57 | if (parse_oid_hex(object + 7, &oid, &p)) |
446c6fae | 58 | return error("char%d: could not get SHA1 hash", 7); |
ec4465ad LT |
59 | |
60 | /* Verify type line */ | |
eedc994f | 61 | type_line = p + 1; |
ec4465ad | 62 | if (memcmp(type_line - 1, "\ntype ", 6)) |
446c6fae | 63 | return error("char%d: could not find \"\\ntype \"", 47); |
ec4465ad LT |
64 | |
65 | /* Verify tag-line */ | |
66 | tag_line = strchr(type_line, '\n'); | |
67 | if (!tag_line) | |
31d713d0 JN |
68 | return error("char%"PRIuMAX": could not find next \"\\n\"", |
69 | (uintmax_t) (type_line - buffer)); | |
ec4465ad LT |
70 | tag_line++; |
71 | if (memcmp(tag_line, "tag ", 4) || tag_line[4] == '\n') | |
31d713d0 JN |
72 | return error("char%"PRIuMAX": no \"tag \" found", |
73 | (uintmax_t) (tag_line - buffer)); | |
ec4465ad LT |
74 | |
75 | /* Get the actual type */ | |
76 | typelen = tag_line - type_line - strlen("type \n"); | |
77 | if (typelen >= sizeof(type)) | |
31d713d0 JN |
78 | return error("char%"PRIuMAX": type too long", |
79 | (uintmax_t) (type_line+5 - buffer)); | |
cfba0459 | 80 | |
ec4465ad LT |
81 | memcpy(type, type_line+5, typelen); |
82 | type[typelen] = 0; | |
83 | ||
84 | /* Verify that the object matches */ | |
eedc994f | 85 | if (verify_object(&oid, type)) |
86 | return error("char%d: could not verify object %s", 7, oid_to_hex(&oid)); | |
ec4465ad LT |
87 | |
88 | /* Verify the tag-name: we don't allow control characters or spaces in it */ | |
89 | tag_line += 4; | |
90 | for (;;) { | |
91 | unsigned char c = *tag_line++; | |
92 | if (c == '\n') | |
93 | break; | |
94 | if (c > ' ') | |
95 | continue; | |
31d713d0 JN |
96 | return error("char%"PRIuMAX": could not verify tag name", |
97 | (uintmax_t) (tag_line - buffer)); | |
ec4465ad LT |
98 | } |
99 | ||
c818566d EB |
100 | /* Verify the tagger line */ |
101 | tagger_line = tag_line; | |
102 | ||
ba26ab99 | 103 | if (memcmp(tagger_line, "tagger ", 7)) |
31d713d0 JN |
104 | return error("char%"PRIuMAX": could not find \"tagger \"", |
105 | (uintmax_t) (tagger_line - buffer)); | |
e0aaf781 BC |
106 | |
107 | /* | |
108 | * Check for correct form for name and email | |
109 | * i.e. " <" followed by "> " on _this_ line | |
ba26ab99 BC |
110 | * No angle brackets within the name or email address fields. |
111 | * No spaces within the email address field. | |
e0aaf781 BC |
112 | */ |
113 | tagger_line += 7; | |
114 | if (!(lb = strstr(tagger_line, " <")) || !(rb = strstr(lb+2, "> ")) || | |
ba26ab99 BC |
115 | strpbrk(tagger_line, "<>\n") != lb+1 || |
116 | strpbrk(lb+2, "><\n ") != rb) | |
31d713d0 JN |
117 | return error("char%"PRIuMAX": malformed tagger field", |
118 | (uintmax_t) (tagger_line - buffer)); | |
e0aaf781 BC |
119 | |
120 | /* Check for author name, at least one character, space is acceptable */ | |
121 | if (lb == tagger_line) | |
31d713d0 JN |
122 | return error("char%"PRIuMAX": missing tagger name", |
123 | (uintmax_t) (tagger_line - buffer)); | |
e0aaf781 | 124 | |
ba26ab99 | 125 | /* timestamp, 1 or more digits followed by space */ |
e0aaf781 | 126 | tagger_line = rb + 2; |
ba26ab99 | 127 | if (!(len = strspn(tagger_line, "0123456789"))) |
31d713d0 JN |
128 | return error("char%"PRIuMAX": missing tag timestamp", |
129 | (uintmax_t) (tagger_line - buffer)); | |
ba26ab99 BC |
130 | tagger_line += len; |
131 | if (*tagger_line != ' ') | |
31d713d0 JN |
132 | return error("char%"PRIuMAX": malformed tag timestamp", |
133 | (uintmax_t) (tagger_line - buffer)); | |
ba26ab99 | 134 | tagger_line++; |
446c6fae | 135 | |
e0aaf781 BC |
136 | /* timezone, 5 digits [+-]hhmm, max. 1400 */ |
137 | if (!((tagger_line[0] == '+' || tagger_line[0] == '-') && | |
ba26ab99 | 138 | strspn(tagger_line+1, "0123456789") == 4 && |
e0aaf781 | 139 | tagger_line[5] == '\n' && atoi(tagger_line+1) <= 1400)) |
31d713d0 JN |
140 | return error("char%"PRIuMAX": malformed tag timezone", |
141 | (uintmax_t) (tagger_line - buffer)); | |
e0aaf781 BC |
142 | tagger_line += 6; |
143 | ||
144 | /* Verify the blank line separating the header from the body */ | |
145 | if (*tagger_line != '\n') | |
31d713d0 JN |
146 | return error("char%"PRIuMAX": trailing garbage in tag header", |
147 | (uintmax_t) (tagger_line - buffer)); | |
c818566d | 148 | |
ec4465ad LT |
149 | /* The actual stuff afterwards we don't care about.. */ |
150 | return 0; | |
151 | } | |
152 | ||
112dd514 | 153 | int cmd_mktag(int argc, const char **argv, const char *prefix) |
ec4465ad | 154 | { |
f285a2d7 | 155 | struct strbuf buf = STRBUF_INIT; |
a09c985e | 156 | struct object_id result; |
ec4465ad LT |
157 | |
158 | if (argc != 1) | |
33e8fc87 | 159 | usage("git mktag"); |
ec4465ad | 160 | |
fd17f5b5 | 161 | if (strbuf_read(&buf, 0, 4096) < 0) { |
0721c314 | 162 | die_errno("could not read from stdin"); |
b97e3dfa | 163 | } |
ec4465ad | 164 | |
a9486b02 PR |
165 | /* Verify it for some basic sanity: it needs to start with |
166 | "object <sha1>\ntype\ntagger " */ | |
fd17f5b5 | 167 | if (verify_tag(buf.buf, buf.len) < 0) |
ec4465ad LT |
168 | die("invalid tag signature file"); |
169 | ||
a09c985e | 170 | if (write_object_file(buf.buf, buf.len, tag_type, &result) < 0) |
ec4465ad | 171 | die("unable to write tag file"); |
e7332f96 | 172 | |
fd17f5b5 | 173 | strbuf_release(&buf); |
a09c985e | 174 | printf("%s\n", oid_to_hex(&result)); |
ec4465ad LT |
175 | return 0; |
176 | } |