[PATCH] show_one_mergetag: print non-parent in hex form.

["Harald van Dijk via GitGitGadget" <gitgitgadget@gmail.com>]

From: Harald van Dijk <harald@gigawatt.nl>

When a mergetag names a non-parent, which can occur after a shallow
clone, its hash was previously printed as raw data. Print it in hex form
instead.

Signed-off-by: Harald van Dijk <harald@gigawatt.nl>
---
    show_one_mergetag: print non-parent in hex form.
    
    When a mergetag names a non-parent, which can occur after a shallow
    clone, its hash was previously printed as raw data. Print it in hex form
    instead.
    
    Signed-off-by: Harald van Dijk harald@gigawatt.nl [harald@gigawatt.nl]
    
    Before, after a shallow clone of 
    https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/:
    
    $ git show -s --show-signature
    commit a2f0b878c3ca531a1706cb2a8b079cea3b17bafc (grafted, HEAD -> master, origin/master, origin/HEAD)
    tag kbuild-fixes-v5.6-2 names a non-parent 꼋<CB>)/<B9><A5>u{^L<8A><B7>u^_A<B0><A1>^D<F8>
    No signature
    Author: Linus Torvalds <torvalds@linux-foundation.org>
    Date:   Thu Feb 27 11:26:33 2020 -0800
    [...]
    
    After:
    
    $ git show -s --show-signature
    commit a2f0b878c3ca531a1706cb2a8b079cea3b17bafc (grafted, HEAD -> master, origin/master, origin/HEAD)
    tag kbuild-fixes-v5.6-2 names a non-parent eabc8bcb292fb9a5757b0c8ab7751f41b0a104f8
    No signature
    Author: Linus Torvalds <torvalds@linux-foundation.org>
    Date:   Thu Feb 27 11:26:33 2020 -0800

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-568%2Fhvdijk%2Fmergetag-hex-form-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-568/hvdijk/mergetag-hex-form-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/568

 log-tree.c     |  2 +-
 t/t4202-log.sh | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/log-tree.c b/log-tree.c
index cae38dcc662..2a2db96d5ec 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -517,7 +517,7 @@ static int show_one_mergetag(struct commit *commit,
 			    "merged tag '%s'\n", tag->tag);
 	else if ((nth = which_parent(&tag->tagged->oid, commit)) < 0)
 		strbuf_addf(&verify_message, "tag %s names a non-parent %s\n",
-				    tag->tag, tag->tagged->oid.hash);
+				    tag->tag, oid_to_hex(&tag->tagged->oid));
 	else
 		strbuf_addf(&verify_message,
 			    "parent #%d, tagged '%s'\n", nth + 1, tag->tag);
diff --git a/t/t4202-log.sh b/t/t4202-log.sh
index 192347a3e1f..20cb436c433 100755
--- a/t/t4202-log.sh
+++ b/t/t4202-log.sh
@@ -1634,6 +1634,26 @@ test_expect_success GPG 'log --graph --show-signature for merged tag' '
 	grep "^| | gpg: Good signature" actual
 '
 
+test_expect_success GPG 'log --graph --show-signature for merged tag in shallow clone' '
+	test_when_finished "git reset --hard && git checkout master" &&
+	git checkout -b plain-shallow master &&
+	echo aaa >bar &&
+	git add bar &&
+	git commit -m bar_commit &&
+	git checkout --detach master &&
+	echo bbb >baz &&
+	git add baz &&
+	git commit -m baz_commit &&
+	git tag -s -m signed_tag_msg signed_tag_shallow &&
+	hash=$(git rev-parse HEAD) &&
+	git checkout plain-shallow &&
+	git merge --no-ff -m msg signed_tag_shallow &&
+	git clone --depth 1 --no-local . shallow &&
+	test_when_finished "rm -rf shallow" &&
+	git -C shallow log --graph --show-signature -n1 plain-shallow >actual &&
+	grep "tag signed_tag_shallow names a non-parent $hash" actual
+'
+
 test_expect_success GPGSM 'log --graph --show-signature for merged tag x509' '
 	test_when_finished "git reset --hard && git checkout master" &&
 	test_config gpg.format x509 &&

base-commit: 2d2118b814c11f509e1aa76cb07110f7231668dc
-- 
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