send-email: accept long lines with suitable transfer encoding

With --validate (which is the default), we warn about lines exceeding
998 characters due to the limits specified in RFC 5322.  However, if
we're using a suitable transfer encoding (quoted-printable or base64),
we're guaranteed not to have lines exceeding 76 characters, so there's
no need to fail in this case.  The auto transfer encoding handles this
specific case, so accept it as well.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

3 files changed, 29 insertions, 9 deletions

diff --git a/Documentation/git-send-email.txt b/Documentation/git-send-email.txt
index 385c7de9e2..0e648075bb 100644
--- a/Documentation/git-send-email.txt
+++ b/Documentation/git-send-email.txt
@@ -401,8 +401,11 @@ have been specified, in which case default to 'compose'.
 +
 --
 		*	Invoke the sendemail-validate hook if present (see linkgit:githooks[5]).
-		*	Warn of patches that contain lines longer than 998 characters; this
-			is due to SMTP limits as described by http://www.ietf.org/rfc/rfc2821.txt.
+		*	Warn of patches that contain lines longer than
+			998 characters unless a suitable transfer encoding
+			('auto', 'base64', or 'quoted-printable') is used;
+			this is due to SMTP limits as described by
+			http://www.ietf.org/rfc/rfc2821.txt.
 --
 +
 Default is the value of `sendemail.validate`; if this is not set,
diff --git a/git-send-email.perl b/git-send-email.perl
index 1736a09d21..e6bcc55827 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -645,7 +645,7 @@ if (@rev_list_opts) {
 if ($validate) {
 	foreach my $f (@files) {
 		unless (-p $f) {
-			my $error = validate_patch($f);
+			my $error = validate_patch($f, $target_xfer_encoding);
 			$error and die sprintf(__("fatal: %s: %s\nwarning: no patches were sent\n"),
 						  $f, $error);
 		}
@@ -1879,7 +1879,7 @@ sub unique_email_list {
 }
 
 sub validate_patch {
-	my $fn = shift;
+	my ($fn, $xfer_encoding) = @_;
 
 	if ($repo) {
 		my $validate_hook = catfile(catdir($repo->repo_path(), 'hooks'),
@@ -1899,11 +1899,15 @@ sub validate_patch {
 		return $hook_error if $hook_error;
 	}
 
-	open(my $fh, '<', $fn)
-		or die sprintf(__("unable to open %s: %s\n"), $fn, $!);
-	while (my $line = <$fh>) {
-		if (length($line) > 998) {
-			return sprintf(__("%s: patch contains a line longer than 998 characters"), $.);
+	# Any long lines will be automatically fixed if we use a suitable transfer
+	# encoding.
+	unless ($xfer_encoding =~ /^(?:auto|quoted-printable|base64)$/) {
+		open(my $fh, '<', $fn)
+			or die sprintf(__("unable to open %s: %s\n"), $fn, $!);
+		while (my $line = <$fh>) {
+			if (length($line) > 998) {
+				return sprintf(__("%s: patch contains a line longer than 998 characters"), $.);
+			}
 		}
 	}
 	return;
diff --git a/t/t9001-send-email.sh b/t/t9001-send-email.sh
index a35cba6a4c..1b474cca28 100755
--- a/t/t9001-send-email.sh
+++ b/t/t9001-send-email.sh
@@ -479,6 +479,19 @@ test_expect_success $PREREQ 'long lines with auto encoding are quoted-printable'
 	grep "Content-Transfer-Encoding: quoted-printable" msgtxt1
 '
 
+for enc in auto quoted-printable base64
+do
+	test_expect_success $PREREQ "--validate passes with encoding $enc" '
+		git send-email \
+			--from="Example <nobody@example.com>" \
+			--to=nobody@example.com \
+			--smtp-server="$(pwd)/fake.sendmail" \
+			--transfer-encoding=$enc \
+			--validate \
+			$patches longline.patch
+	'
+done
+
 test_expect_success $PREREQ 'Invalid In-Reply-To' '
 	clean_fake_sendmail &&
 	git send-email \