git-am: add --message-id/--no-message-id

Parse the option and pass it directly to git-mailinfo.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-am.txt

@@ -57,6 +57,17 @@ OPTIONS
 --no-scissors::
 	Ignore scissors lines (see linkgit:git-mailinfo[1]).
 
+-m::
+--message-id::
+	Pass the `-m` flag to 'git mailinfo' (see linkgit:git-mailinfo[1]),
+	so that the Message-ID header is added to the commit message.
+	The `am.messageid` configuration variable can be used to specify
+	the default behaviour.
+
+--no-message-id::
+	Do not add the Message-ID header to the commit message.
+	`no-message-id` is useful to override `am.messageid`.
+
 -q::
 --quiet::
 	Be quiet. Only print error messages.

git-am.sh

@@ -17,6 +17,7 @@ s,signoff       add a Signed-off-by line to the commit message
 u,utf8          recode into utf8 (default)
 k,keep          pass -k flag to git-mailinfo
 keep-non-patch  pass -b flag to git-mailinfo
+m,message-id    pass -m flag to git-mailinfo
 keep-cr         pass --keep-cr flag to git-mailsplit for mbox format
 no-keep-cr      do not pass --keep-cr flag to git-mailsplit independent of am.keepcr
 c,scissors      strip everything before a scissors line
@@ -371,13 +372,18 @@ split_patches () {
 prec=4
 dotest="$GIT_DIR/rebase-apply"
 sign= utf8=t keep= keepcr= skip= interactive= resolved= rebasing= abort=
-resolvemsg= resume= scissors= no_inbody_headers=
+messageid= resolvemsg= resume= scissors= no_inbody_headers=
 git_apply_opt=
 committer_date_is_author_date=
 ignore_date=
 allow_rerere_autoupdate=
 gpg_sign_opt=
 
+if test "$(git config --bool --get am.messageid)" = true
+then
+    messageid=t
+fi
+
 if test "$(git config --bool --get am.keepcr)" = true
 then
     keepcr=t
@@ -400,6 +406,10 @@ it will be removed. Please do not use it anymore."
 		utf8=t ;; # this is now default
 	--no-utf8)
 		utf8= ;;
+	-m|--message-id)
+		messageid=t ;;
+	--no-message-id)
+		messageid=f ;;
 	-k|--keep)
 		keep=t ;;
 	--keep-non-patch)
@@ -567,6 +577,7 @@ Use \"git am --abort\" to remove it.")"
 	echo "$sign" >"$dotest/sign"
 	echo "$utf8" >"$dotest/utf8"
 	echo "$keep" >"$dotest/keep"
+	echo "$messageid" >"$dotest/messageid"
 	echo "$scissors" >"$dotest/scissors"
 	echo "$no_inbody_headers" >"$dotest/no_inbody_headers"
 	echo "$GIT_QUIET" >"$dotest/quiet"
@@ -621,6 +632,12 @@ b)
 *)
 	keep= ;;
 esac
+case "$(cat "$dotest/messageid")" in
+t)
+	messageid=-m ;;
+f)
+	messageid= ;;
+esac
 case "$(cat "$dotest/scissors")" in
 t)
 	scissors=--scissors ;;
@@ -692,7 +709,7 @@ do
 			get_author_ident_from_commit "$commit" >"$dotest/author-script"
 			git diff-tree --root --binary --full-index "$commit" >"$dotest/patch"
 		else
-			git mailinfo $keep $no_inbody_headers $scissors $utf8 "$dotest/msg" "$dotest/patch" \
+			git mailinfo $keep $no_inbody_headers $messageid $scissors $utf8 "$dotest/msg" "$dotest/patch" \
 				<"$dotest/$msgnum" >"$dotest/info" ||
 				stop_here $this
 

t/t4150-am.sh

@@ -85,6 +85,7 @@ test_expect_success setup '
 
 	git format-patch --stdout first >patch1 &&
 	{
+		echo "Message-Id: <1226501681-24923-1-git-send-email-bda@mnsspb.ru>" &&
 		echo "X-Fake-Field: Line One" &&
 		echo "X-Fake-Field: Line Two" &&
 		echo "X-Fake-Field: Line Three" &&
@@ -536,4 +537,26 @@ test_expect_success 'am empty-file does not infloop' '
 	test_i18ncmp expected actual
 '
 
+test_expect_success 'am --message-id really adds the message id' '
+	rm -fr .git/rebase-apply &&
+	git reset --hard &&
+	git checkout HEAD^ &&
+	git am --message-id patch1.eml &&
+	test_path_is_missing .git/rebase-apply &&
+	git cat-file commit HEAD | tail -n1 >actual &&
+	grep Message-Id patch1.eml >expected &&
+	test_cmp expected actual
+'
+
+test_expect_success 'am --message-id -s signs off after the message id' '
+	rm -fr .git/rebase-apply &&
+	git reset --hard &&
+	git checkout HEAD^ &&
+	git am -s --message-id patch1.eml &&
+	test_path_is_missing .git/rebase-apply &&
+	git cat-file commit HEAD | tail -n2 | head -n1 >actual &&
+	grep Message-Id patch1.eml >expected &&
+	test_cmp expected actual
+'
+
 test_done