$ git clone -n https://src.fedoraproject.org/rpms/perl-FreezeThaw.git /var/lib/mock/f45-build-23649-598/root/chroot_tmpdir/scmroot/perl-FreezeThaw
Cloning into '/var/lib/mock/f45-build-23649-598/root/chroot_tmpdir/scmroot/perl-FreezeThaw'...
$ git fetch origin 9b12fee1f0c5c697f8d8ccc67ff7b03b50715fe0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-FreezeThaw
 * [new ref]         9b12fee1f0c5c697f8d8ccc67ff7b03b50715fe0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9b12fee Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild