In some workflows we have no control on how git command is executed,
however a signed tags are required.

The new config-file option tag.gpgSign enforces signed tags. Additional
command line option --no-gpg-sign is added to disable such behavior if
needed. E.g.:

    $ git tag -m "commit message"

will generate a GPG signed tag if tag.gpgSign option is true, while

    $ git tag --no-gpg-sign -m "commit message"

will skip the signing step.

Signed-off-by: Tigran Mkrtchyan <[email protected]>
---
 Documentation/config.txt               |  4 ++++
 Documentation/git-tag.txt              |  4 ++++
 builtin/tag.c                          | 18 +++++++++++++++---
 contrib/completion/git-completion.bash |  1 +
 t/t7004-tag.sh                         | 21 +++++++++++++++++++++
 5 files changed, 45 insertions(+), 3 deletions(-)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 1ac0ae6ad..fa6694bec 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -3161,6 +3161,10 @@ tag.forceSignAnnotated::
        If `--annotate` is specified on the command line, it takes
        precedence over this option.
 
+tag.gpgSign::
+
+       A boolean to specify whether all tags should be GPG signed.
+
 tag.sort::
        This variable controls the sort ordering of tags when displayed by
        linkgit:git-tag[1]. Without the "--sort=<value>" option provided, the
diff --git a/Documentation/git-tag.txt b/Documentation/git-tag.txt
index 956fc019f..1dd43f18b 100644
--- a/Documentation/git-tag.txt
+++ b/Documentation/git-tag.txt
@@ -181,6 +181,10 @@ This option is only applicable when listing tags without 
annotation lines.
        `--create-reflog`, but currently does not negate the setting of
        `core.logAllRefUpdates`.
 
+--no-gpg-sign::
+       Countermand `tag.gpgSign` configuration variable that is
+       set to force each and every tag to be signed.
+
 <tagname>::
        The name of the tag to create, delete, or describe.
        The new tag name must pass all checks defined by
diff --git a/builtin/tag.c b/builtin/tag.c
index b38329b59..d9060a404 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -31,6 +31,7 @@ static const char * const git_tag_usage[] = {
 
 static unsigned int colopts;
 static int force_sign_annotate;
+static int sign_tag;
 
 static int list_tags(struct ref_filter *filter, struct ref_sorting *sorting,
                     struct ref_format *format)
@@ -141,6 +142,11 @@ static int git_tag_config(const char *var, const char 
*value, void *cb)
        int status;
        struct ref_sorting **sorting_tail = (struct ref_sorting **)cb;
 
+       if (!strcmp(var, "tag.gpgsign")) {
+               sign_tag = git_config_bool(var, value);
+               return 0;
+       }
+
        if (!strcmp(var, "tag.sort")) {
                if (!value)
                        return config_error_nonbool(var);
@@ -372,6 +378,7 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
        static struct ref_sorting *sorting = NULL, **sorting_tail = &sorting;
        struct ref_format format = REF_FORMAT_INIT;
        int icase = 0;
+       int no_gpg_sign = 0;
        struct option options[] = {
                OPT_CMDMODE('l', "list", &cmdmode, N_("list tag names"), 'l'),
                { OPTION_INTEGER, 'n', NULL, &filter.lines, N_("n"),
@@ -393,6 +400,7 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
                                        N_("use another key to sign the tag")),
                OPT__FORCE(&force, N_("replace the tag if exists")),
                OPT_BOOL(0, "create-reflog", &create_reflog, N_("create a 
reflog")),
+               OPT_BOOL(0, "no-gpg-sign", &no_gpg_sign, N_("do not GPG-sign 
tag")),
 
                OPT_GROUP(N_("Tag listing options")),
                OPT_COLUMN(0, "column", &colopts, N_("show tag list in 
columns")),
@@ -426,6 +434,10 @@ int cmd_tag(int argc, const char **argv, const char 
*prefix)
 
        argc = parse_options(argc, argv, prefix, options, git_tag_usage, 0);
 
+       if (no_gpg_sign) {
+               sign_tag = 0;
+       }
+
        if (keyid) {
                opt.sign = 1;
                set_signing_key(keyid);
@@ -444,7 +456,7 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
        if (cmdmode == 'l')
                setup_auto_pager("tag", 1);
 
-       if ((create_tag_object || force) && (cmdmode != 0))
+       if ((create_tag_object || force || no_gpg_sign) && (cmdmode != 0))
                usage_with_options(git_tag_usage, options);
 
        finalize_colopts(&colopts, -1);
@@ -536,8 +548,8 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 
        create_reflog_msg(&object, &reflog_msg);
 
-       if (create_tag_object) {
-               if (force_sign_annotate && !annotate)
+       if (create_tag_object || sign_tag) {
+               if (sign_tag || (force_sign_annotate && !annotate))
                        opt.sign = 1;
                create_tag(&object, tag, &buf, &opt, &prev, &object);
        }
diff --git a/contrib/completion/git-completion.bash 
b/contrib/completion/git-completion.bash
index 0e16f017a..0dbe689a2 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -2648,6 +2648,7 @@ _git_config ()
                status.showUntrackedFiles
                status.submodulesummary
                submodule.
+               tag.gpgSign
                tar.umask
                transfer.unpackLimit
                url.
diff --git a/t/t7004-tag.sh b/t/t7004-tag.sh
index a9af2de99..ccff37733 100755
--- a/t/t7004-tag.sh
+++ b/t/t7004-tag.sh
@@ -904,6 +904,27 @@ test_expect_success GPG \
        test_cmp expect actual
 '
 
+get_tag_header gpgsign-enabled $commit commit $time >expect
+echo "A message" >>expect
+echo '-----BEGIN PGP SIGNATURE-----' >>expect
+test_expect_success GPG \
+       'git tag configured tag.gpgsign enables GPG sign' \
+       'test_config tag.gpgsign true &&
+       git tag -m "A message" gpgsign-enabled &&
+       get_tag_msg gpgsign-enabled>actual &&
+       test_cmp expect actual
+'
+
+get_tag_header no-gpg-sign $commit commit $time >expect
+echo "A message" >>expect
+test_expect_success GPG \
+       'git tag --no-gpg-sign configured tag.gpgsign skip GPG sign' \
+       'test_config tag.gpgsign true &&
+       git tag -a --no-gpg-sign -m "A message" no-gpg-sign &&
+       get_tag_msg no-gpg-sign>actual &&
+       test_cmp expect actual
+'
+
 test_expect_success GPG \
        'trying to create a signed tag with non-existing -F file should fail' '
        ! test -f nonexistingfile &&
-- 
2.13.6

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