$ git clone -n https://src.fedoraproject.org/rpms/perl-PHP-Serialization.git /var/lib/mock/f45-build-25503-611/root/chroot_tmpdir/scmroot/perl-PHP-Serialization
Cloning into '/var/lib/mock/f45-build-25503-611/root/chroot_tmpdir/scmroot/perl-PHP-Serialization'...
$ git fetch origin c031b5a7d9c4097b2219a9f43fcb3642158f53d5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-PHP-Serialization
 * [new ref]         c031b5a7d9c4097b2219a9f43fcb3642158f53d5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c031b5a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild