$ git clone -n https://src.fedoraproject.org/rpms/perl-Convert-Color.git /var/lib/mock/f45-build-22573-593/root/chroot_tmpdir/scmroot/perl-Convert-Color
Cloning into '/var/lib/mock/f45-build-22573-593/root/chroot_tmpdir/scmroot/perl-Convert-Color'...
$ git fetch origin 0aac63e640302e6ce27e5e0a87a2304205ad2949:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Convert-Color
 * [new ref]         0aac63e640302e6ce27e5e0a87a2304205ad2949 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0aac63e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild