$ git clone -n https://src.fedoraproject.org/rpms/perl-Context-Preserve.git /var/lib/mock/f45-build-22555-593/root/chroot_tmpdir/scmroot/perl-Context-Preserve
Cloning into '/var/lib/mock/f45-build-22555-593/root/chroot_tmpdir/scmroot/perl-Context-Preserve'...
$ git fetch origin a945f28e10d6397e57ac6ab138b7227a8026f43e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Context-Preserve
 * [new ref]         a945f28e10d6397e57ac6ab138b7227a8026f43e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a945f28 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild