$ git clone -n https://src.fedoraproject.org/rpms/perl-Types-Serialiser.git /var/lib/mock/f45-build-27256-622/root/chroot_tmpdir/scmroot/perl-Types-Serialiser
Cloning into '/var/lib/mock/f45-build-27256-622/root/chroot_tmpdir/scmroot/perl-Types-Serialiser'...
$ git fetch origin 47a7de7bcc309cd43829458cef37aa32c479df54:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Types-Serialiser
 * [new ref]         47a7de7bcc309cd43829458cef37aa32c479df54 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 47a7de7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild