$ git clone -n https://src.fedoraproject.org/rpms/perl-Callback.git /var/lib/mock/f45-build-22227-590/root/chroot_tmpdir/scmroot/perl-Callback
Cloning into '/var/lib/mock/f45-build-22227-590/root/chroot_tmpdir/scmroot/perl-Callback'...
$ git fetch origin 142fdec83d1ce9591ea371c2379e06ba7a74b927:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Callback
 * [new ref]         142fdec83d1ce9591ea371c2379e06ba7a74b927 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 142fdec Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild