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![brian m. carlson](/assets/img/avatar_default.png)
Convert both the argument and the return value to be pointers to struct object_id. Update the callers and their internals to deal with the new type. Remove several temporaries which are no longer needed. Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
175 lines
5.2 KiB
C
175 lines
5.2 KiB
C
#include "builtin.h"
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#include "tag.h"
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/*
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* A signature file has a very simple fixed format: four lines
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* of "object <sha1>" + "type <typename>" + "tag <tagname>" +
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* "tagger <committer>", followed by a blank line, a free-form tag
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* message and a signature block that git itself doesn't care about,
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* but that can be verified with gpg or similar.
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*
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* The first four lines are guaranteed to be at least 83 bytes:
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* "object <sha1>\n" is 48 bytes, "type tag\n" at 9 bytes is the
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* shortest possible type-line, "tag .\n" at 6 bytes is the shortest
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* single-character-tag line, and "tagger . <> 0 +0000\n" at 20 bytes is
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* the shortest possible tagger-line.
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*/
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/*
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* We refuse to tag something we can't verify. Just because.
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*/
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static int verify_object(const struct object_id *oid, const char *expected_type)
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{
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int ret = -1;
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enum object_type type;
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unsigned long size;
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void *buffer = read_object_file(oid, &type, &size);
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const struct object_id *repl = lookup_replace_object(oid);
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if (buffer) {
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if (type == type_from_string(expected_type))
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ret = check_object_signature(repl, buffer, size, expected_type);
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free(buffer);
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}
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return ret;
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}
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static int verify_tag(char *buffer, unsigned long size)
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{
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int typelen;
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char type[20];
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struct object_id oid;
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const char *object, *type_line, *tag_line, *tagger_line, *lb, *rb, *p;
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size_t len;
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if (size < 84)
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return error("wanna fool me ? you obviously got the size wrong !");
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buffer[size] = 0;
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/* Verify object line */
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object = buffer;
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if (memcmp(object, "object ", 7))
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return error("char%d: does not start with \"object \"", 0);
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if (parse_oid_hex(object + 7, &oid, &p))
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return error("char%d: could not get SHA1 hash", 7);
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/* Verify type line */
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type_line = p + 1;
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if (memcmp(type_line - 1, "\ntype ", 6))
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return error("char%d: could not find \"\\ntype \"", 47);
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/* Verify tag-line */
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tag_line = strchr(type_line, '\n');
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if (!tag_line)
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return error("char%"PRIuMAX": could not find next \"\\n\"",
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(uintmax_t) (type_line - buffer));
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tag_line++;
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if (memcmp(tag_line, "tag ", 4) || tag_line[4] == '\n')
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return error("char%"PRIuMAX": no \"tag \" found",
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(uintmax_t) (tag_line - buffer));
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/* Get the actual type */
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typelen = tag_line - type_line - strlen("type \n");
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if (typelen >= sizeof(type))
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return error("char%"PRIuMAX": type too long",
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(uintmax_t) (type_line+5 - buffer));
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memcpy(type, type_line+5, typelen);
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type[typelen] = 0;
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/* Verify that the object matches */
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if (verify_object(&oid, type))
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return error("char%d: could not verify object %s", 7, oid_to_hex(&oid));
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/* Verify the tag-name: we don't allow control characters or spaces in it */
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tag_line += 4;
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for (;;) {
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unsigned char c = *tag_line++;
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if (c == '\n')
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break;
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if (c > ' ')
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continue;
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return error("char%"PRIuMAX": could not verify tag name",
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(uintmax_t) (tag_line - buffer));
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}
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/* Verify the tagger line */
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tagger_line = tag_line;
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if (memcmp(tagger_line, "tagger ", 7))
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return error("char%"PRIuMAX": could not find \"tagger \"",
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(uintmax_t) (tagger_line - buffer));
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/*
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* Check for correct form for name and email
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* i.e. " <" followed by "> " on _this_ line
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* No angle brackets within the name or email address fields.
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* No spaces within the email address field.
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*/
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tagger_line += 7;
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if (!(lb = strstr(tagger_line, " <")) || !(rb = strstr(lb+2, "> ")) ||
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strpbrk(tagger_line, "<>\n") != lb+1 ||
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strpbrk(lb+2, "><\n ") != rb)
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return error("char%"PRIuMAX": malformed tagger field",
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(uintmax_t) (tagger_line - buffer));
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/* Check for author name, at least one character, space is acceptable */
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if (lb == tagger_line)
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return error("char%"PRIuMAX": missing tagger name",
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(uintmax_t) (tagger_line - buffer));
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/* timestamp, 1 or more digits followed by space */
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tagger_line = rb + 2;
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if (!(len = strspn(tagger_line, "0123456789")))
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return error("char%"PRIuMAX": missing tag timestamp",
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(uintmax_t) (tagger_line - buffer));
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tagger_line += len;
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if (*tagger_line != ' ')
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return error("char%"PRIuMAX": malformed tag timestamp",
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(uintmax_t) (tagger_line - buffer));
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tagger_line++;
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/* timezone, 5 digits [+-]hhmm, max. 1400 */
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if (!((tagger_line[0] == '+' || tagger_line[0] == '-') &&
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strspn(tagger_line+1, "0123456789") == 4 &&
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tagger_line[5] == '\n' && atoi(tagger_line+1) <= 1400))
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return error("char%"PRIuMAX": malformed tag timezone",
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(uintmax_t) (tagger_line - buffer));
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tagger_line += 6;
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/* Verify the blank line separating the header from the body */
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if (*tagger_line != '\n')
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return error("char%"PRIuMAX": trailing garbage in tag header",
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(uintmax_t) (tagger_line - buffer));
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/* The actual stuff afterwards we don't care about.. */
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return 0;
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}
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int cmd_mktag(int argc, const char **argv, const char *prefix)
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{
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struct strbuf buf = STRBUF_INIT;
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struct object_id result;
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if (argc != 1)
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usage("git mktag");
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if (strbuf_read(&buf, 0, 4096) < 0) {
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die_errno("could not read from stdin");
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}
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/* Verify it for some basic sanity: it needs to start with
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"object <sha1>\ntype\ntagger " */
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if (verify_tag(buf.buf, buf.len) < 0)
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die("invalid tag signature file");
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if (write_object_file(buf.buf, buf.len, tag_type, &result) < 0)
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die("unable to write tag file");
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strbuf_release(&buf);
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printf("%s\n", oid_to_hex(&result));
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return 0;
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}
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