$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-WriteVariants.git /var/lib/mock/f45-build-26929-620/root/chroot_tmpdir/scmroot/perl-Test-WriteVariants
Cloning into '/var/lib/mock/f45-build-26929-620/root/chroot_tmpdir/scmroot/perl-Test-WriteVariants'...
$ git fetch origin de3de63c63d46ecefb078e36aa4dbbe59a2a2cb2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-WriteVariants
 * [new ref]         de3de63c63d46ecefb078e36aa4dbbe59a2a2cb2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at de3de63 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild