$ git clone -n https://src.fedoraproject.org/rpms/perl-POE-Component-Child.git /var/lib/mock/f45-build-25508-611/root/chroot_tmpdir/scmroot/perl-POE-Component-Child
Cloning into '/var/lib/mock/f45-build-25508-611/root/chroot_tmpdir/scmroot/perl-POE-Component-Child'...
$ git fetch origin 59007a806fbfad8f97ba2d76a2e76ced6e76bbaf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-POE-Component-Child
 * [new ref]         59007a806fbfad8f97ba2d76a2e76ced6e76bbaf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 59007a8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild