[PATCH v2 4/5] builtin/verify-tag: add --format to verify-tag

[santiago@nyu.edu]

From: Santiago Torres <santiago@nyu.edu>

Callers of verify-tag may want to cross-check the tagname from refs/tags
with the tagname from the tag object header upon GPG verification. This
is to avoid tag refs that point to an incorrect object.

Add a --format parameter to git verify-tag to print the formatted tag
object header in addition to or instead of the --verbose or --raw GPG
verification output.

Signed-off-by: Santiago Torres <santiago@nyu.edu>
---
 builtin/verify-tag.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/builtin/verify-tag.c b/builtin/verify-tag.c
index de10198..a941053 100644
--- a/builtin/verify-tag.c
+++ b/builtin/verify-tag.c
@@ -12,12 +12,15 @@
 #include <signal.h>
 #include "parse-options.h"
 #include "gpg-interface.h"
+#include "ref-filter.h"
 
 static const char * const verify_tag_usage[] = {
-		N_("git verify-tag [-v | --verbose] <tag>..."),
+		N_("git verify-tag [-v | --verbose] [--format=<format>] <tag>..."),
 		NULL
 };
 
+static char *fmt_pretty;
+
 static int git_verify_tag_config(const char *var, const char *value, void *cb)
 {
 	int status = git_gpg_config(var, value, cb);
@@ -33,6 +36,7 @@ int cmd_verify_tag(int argc, const char **argv, const char *prefix)
 	const struct option verify_tag_options[] = {
 		OPT__VERBOSE(&verbose, N_("print tag contents")),
 		OPT_BIT(0, "raw", &flags, N_("print raw gpg status output"), GPG_VERIFY_RAW),
+		OPT_STRING(  0 , "format", &fmt_pretty, N_("format"), N_("format to use for the output")),
 		OPT_END()
 	};
 
@@ -46,12 +50,17 @@ int cmd_verify_tag(int argc, const char **argv, const char *prefix)
 	if (verbose)
 		flags |= GPG_VERIFY_VERBOSE;
 
+	if (fmt_pretty) {
+		verify_ref_format(fmt_pretty);
+		flags |= GPG_VERIFY_QUIET;
+	}
+
 	while (i < argc) {
 		unsigned char sha1[20];
 		const char *name = argv[i++];
 		if (get_sha1(name, sha1))
 			had_error = !!error("tag '%s' not found.", name);
-		else if (verify_and_format_tag(sha1, name, NULL, flags))
+		else if (verify_and_format_tag(sha1, name, fmt_pretty, flags))
 			had_error = 1;
 	}
 	return had_error;
-- 
2.10.0