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2f47eae2a1
This mostly moves existing code from builtin/tag.c (for signing) and builtin/verify-tag.c (for verifying) to a new gpg-interface.c file to provide a more generic library interface. - sign_buffer() takes a payload strbuf, a signature strbuf, and a signing key, runs "gpg" to produce a detached signature for the payload, and appends it to the signature strbuf. The contents of a signed tag that concatenates the payload and the detached signature can be produced by giving the same strbuf as payload and signature strbuf. - verify_signed_buffer() takes a payload and a detached signature as <ptr, len> pairs, and runs "gpg --verify" to see if the payload matches the signature. It can optionally capture the output from GPG to allow the callers to pretty-print it in a way more suitable for their contexts. "verify-tag" (aka "tag -v") used to save the whole tag contents as if it is a detached signature, and fed gpg the payload part of the tag. It relied on gpg to fail when the given tag is not signed but just is annotated. The updated run_gpg_verify() function detects the lack of detached signature in the input, and errors out without bothering "gpg". Signed-off-by: Junio C Hamano <gitster@pobox.com>
84 lines
1.9 KiB
C
84 lines
1.9 KiB
C
/*
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* Builtin "git verify-tag"
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*
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* Copyright (c) 2007 Carlos Rica <jasampler@gmail.com>
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*
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* Based on git-verify-tag.sh
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*/
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#include "cache.h"
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#include "builtin.h"
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#include "tag.h"
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#include "run-command.h"
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#include <signal.h>
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#include "parse-options.h"
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#include "gpg-interface.h"
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static const char * const verify_tag_usage[] = {
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"git verify-tag [-v|--verbose] <tag>...",
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NULL
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};
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static int run_gpg_verify(const char *buf, unsigned long size, int verbose)
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{
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int len;
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len = parse_signature(buf, size);
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if (verbose)
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write_in_full(1, buf, len);
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if (size == len)
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return error("no signature found");
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return verify_signed_buffer(buf, len, buf + len, size - len, NULL);
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}
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static int verify_tag(const char *name, int verbose)
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{
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enum object_type type;
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unsigned char sha1[20];
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char *buf;
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unsigned long size;
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int ret;
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if (get_sha1(name, sha1))
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return error("tag '%s' not found.", name);
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type = sha1_object_info(sha1, NULL);
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if (type != OBJ_TAG)
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return error("%s: cannot verify a non-tag object of type %s.",
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name, typename(type));
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buf = read_sha1_file(sha1, &type, &size);
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if (!buf)
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return error("%s: unable to read file.", name);
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ret = run_gpg_verify(buf, size, verbose);
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free(buf);
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return ret;
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}
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int cmd_verify_tag(int argc, const char **argv, const char *prefix)
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{
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int i = 1, verbose = 0, had_error = 0;
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const struct option verify_tag_options[] = {
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OPT__VERBOSE(&verbose, "print tag contents"),
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OPT_END()
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};
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git_config(git_default_config, NULL);
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argc = parse_options(argc, argv, prefix, verify_tag_options,
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verify_tag_usage, PARSE_OPT_KEEP_ARGV0);
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if (argc <= i)
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usage_with_options(verify_tag_usage, verify_tag_options);
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/* sometimes the program was terminated because this signal
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* was received in the process of writing the gpg input: */
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signal(SIGPIPE, SIG_IGN);
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while (i < argc)
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if (verify_tag(argv[i++], verbose))
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had_error = 1;
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return had_error;
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}
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