verify-tag by default displays human-readable output on standard error.
However, it can also be useful to get access to the raw gpg status
information, which is machine-readable, allowing automated
implementation of signing policy.  Add a --raw option to make verify-tag
produce the gpg status information on standard error instead of the
human-readable format.

Signed-off-by: brian m. carlson <sand...@crustytoothpaste.net>
---
 Documentation/git-verify-tag.txt |  4 ++++
 builtin/verify-tag.c             | 21 +++++++++++++++------
 t/t7030-verify-tag.sh            | 31 +++++++++++++++++++++++++++++++
 3 files changed, 50 insertions(+), 6 deletions(-)

diff --git a/Documentation/git-verify-tag.txt b/Documentation/git-verify-tag.txt
index f88ba96..d590edc 100644
--- a/Documentation/git-verify-tag.txt
+++ b/Documentation/git-verify-tag.txt
@@ -16,6 +16,10 @@ Validates the gpg signature created by 'git tag'.
 
 OPTIONS
 -------
+--raw::
+       Print the raw gpg status output to standard error instead of the normal
+       human-readable output.
+
 -v::
 --verbose::
        Print the contents of the tag object before validating it.
diff --git a/builtin/verify-tag.c b/builtin/verify-tag.c
index 53c68fc..745c013 100644
--- a/builtin/verify-tag.c
+++ b/builtin/verify-tag.c
@@ -18,9 +18,12 @@ static const char * const verify_tag_usage[] = {
                NULL
 };
 
-static int run_gpg_verify(const char *buf, unsigned long size, int verbose)
+static int run_gpg_verify(const char *buf, unsigned long size, int verbose, 
int raw)
 {
+       struct strbuf status = STRBUF_INIT, human_readable = STRBUF_INIT;
+       const struct strbuf *output = raw ? &status : &human_readable;
        int len;
+       int ret;
 
        len = parse_signature(buf, size);
        if (verbose)
@@ -29,10 +32,15 @@ static int run_gpg_verify(const char *buf, unsigned long 
size, int verbose)
        if (size == len)
                return error("no signature found");
 
-       return verify_signed_buffer(buf, len, buf + len, size - len, NULL, 
NULL);
+       ret = verify_signed_buffer(buf, len, buf + len, size - len, 
&human_readable,
+                       &status);
+
+       fputs(output->buf, stderr);
+
+       return ret;
 }
 
-static int verify_tag(const char *name, int verbose)
+static int verify_tag(const char *name, int verbose, int raw)
 {
        enum object_type type;
        unsigned char sha1[20];
@@ -52,7 +60,7 @@ static int verify_tag(const char *name, int verbose)
        if (!buf)
                return error("%s: unable to read file.", name);
 
-       ret = run_gpg_verify(buf, size, verbose);
+       ret = run_gpg_verify(buf, size, verbose, raw);
 
        free(buf);
        return ret;
@@ -68,9 +76,10 @@ static int git_verify_tag_config(const char *var, const char 
*value, void *cb)
 
 int cmd_verify_tag(int argc, const char **argv, const char *prefix)
 {
-       int i = 1, verbose = 0, had_error = 0;
+       int i = 1, verbose = 0, had_error = 0, raw = 0;
        const struct option verify_tag_options[] = {
                OPT__VERBOSE(&verbose, N_("print tag contents")),
+               OPT_BOOL(0, "raw", &raw, N_("print raw gpg status output")),
                OPT_END()
        };
 
@@ -85,7 +94,7 @@ int cmd_verify_tag(int argc, const char **argv, const char 
*prefix)
         * was received in the process of writing the gpg input: */
        signal(SIGPIPE, SIG_IGN);
        while (i < argc)
-               if (verify_tag(argv[i++], verbose))
+               if (verify_tag(argv[i++], verbose, raw))
                        had_error = 1;
        return had_error;
 }
diff --git a/t/t7030-verify-tag.sh b/t/t7030-verify-tag.sh
index 9ca0d29..0ac15e6 100755
--- a/t/t7030-verify-tag.sh
+++ b/t/t7030-verify-tag.sh
@@ -82,4 +82,35 @@ test_expect_success GPG 'verify and show signatures' '
        )
 '
 
+test_expect_success GPG 'verify signatures with --raw' '
+       (
+               for tag in initial second merge fourth-signed sixth-signed 
seventh-signed
+               do
+                       git verify-tag --raw $tag 2>actual &&
+                       grep "GOODSIG" actual &&
+                       ! grep "BADSIG" actual &&
+                       echo $tag OK || exit 1
+               done
+       ) &&
+       (
+               for tag in fourth-unsigned fifth-unsigned sixth-unsigned
+               do
+                       test_must_fail git verify-tag --raw $tag 2>actual &&
+                       ! grep "GOODSIG" actual &&
+                       ! grep "BADSIG" actual &&
+                       echo $tag OK || exit 1
+               done
+       ) &&
+       (
+               for tag in eighth-signed-alt
+               do
+                       git verify-tag --raw $tag 2>actual &&
+                       grep "GOODSIG" actual &&
+                       ! grep "BADSIG" actual &&
+                       grep "TRUST_UNDEFINED" actual &&
+                       echo $tag OK || exit 1
+               done
+       )
+'
+
 test_done
-- 
2.4.0

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