$ git clone -n https://src.fedoraproject.org/rpms/perl-Email-MIME-ContentType.git /var/lib/mock/f45-build-23306-596/root/chroot_tmpdir/scmroot/perl-Email-MIME-ContentType
Cloning into '/var/lib/mock/f45-build-23306-596/root/chroot_tmpdir/scmroot/perl-Email-MIME-ContentType'...
$ git fetch origin 23bb0088f098b2cc20d06baad234d5d49e261742:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Email-MIME-ContentType
 * [new ref]         23bb0088f098b2cc20d06baad234d5d49e261742 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 23bb008 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild