$ git clone -n https://src.fedoraproject.org/rpms/perl-Test2-Plugin-MemUsage.git /var/lib/mock/f45-build-26949-620/root/chroot_tmpdir/scmroot/perl-Test2-Plugin-MemUsage
Cloning into '/var/lib/mock/f45-build-26949-620/root/chroot_tmpdir/scmroot/perl-Test2-Plugin-MemUsage'...
$ git fetch origin 7848b4668dc2933718d51e102a523aadb32c7a44:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test2-Plugin-MemUsage
 * [new ref]         7848b4668dc2933718d51e102a523aadb32c7a44 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7848b46 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild