$ git clone -n https://src.fedoraproject.org/rpms/perl-Device-SerialPort.git /var/lib/mock/f45-build-23135-596/root/chroot_tmpdir/scmroot/perl-Device-SerialPort
Cloning into '/var/lib/mock/f45-build-23135-596/root/chroot_tmpdir/scmroot/perl-Device-SerialPort'...
$ git fetch origin 2116ed1dd0f4da2b8d4380e8f275d564d5654bce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Device-SerialPort
 * [new ref]         2116ed1dd0f4da2b8d4380e8f275d564d5654bce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2116ed1 Perl 5.44 rebuild