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Commit signatures can be verified using "git show -s --show-signature" or the "%G?" pretty format and parsing the output, which is well suited for user inspection, but not for scripting. Provide a command "verify-commit" which is analogous to "verify-tag": It returns 0 for good signatures and non-zero otherwise, has the gpg output on stderr and (optionally) the commit object on stdout, sans the signature, just like "verify-tag" does. Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
/*
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* Builtin "git commit-commit"
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*
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* Copyright (c) 2014 Michael J Gruber <git@drmicha.warpmail.net>
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*
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* Based on git-verify-tag
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*/
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#include "cache.h"
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#include "builtin.h"
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#include "commit.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_commit_usage[] = {
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N_("git verify-commit [-v|--verbose] <commit>..."),
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NULL
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};
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static int run_gpg_verify(const unsigned char *sha1, const char *buf, unsigned long size, int verbose)
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{
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struct signature_check signature_check;
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memset(&signature_check, 0, sizeof(signature_check));
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check_commit_signature(lookup_commit(sha1), &signature_check);
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if (verbose && signature_check.payload)
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fputs(signature_check.payload, stdout);
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if (signature_check.gpg_output)
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fputs(signature_check.gpg_output, stderr);
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signature_check_clear(&signature_check);
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return signature_check.result != 'G';
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}
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static int verify_commit(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("commit '%s' not found.", name);
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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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if (type != OBJ_COMMIT)
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return error("%s: cannot verify a non-commit object of type %s.",
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name, typename(type));
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ret = run_gpg_verify(sha1, buf, size, verbose);
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free(buf);
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return ret;
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}
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static int git_verify_commit_config(const char *var, const char *value, void *cb)
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{
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int status = git_gpg_config(var, value, cb);
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if (status)
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return status;
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return git_default_config(var, value, cb);
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}
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int cmd_verify_commit(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_commit_options[] = {
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OPT__VERBOSE(&verbose, N_("print commit contents")),
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OPT_END()
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};
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git_config(git_verify_commit_config, NULL);
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argc = parse_options(argc, argv, prefix, verify_commit_options,
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verify_commit_usage, PARSE_OPT_KEEP_ARGV0);
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if (argc <= i)
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usage_with_options(verify_commit_usage, verify_commit_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_commit(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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