$ git clone -n https://src.fedoraproject.org/rpms/perl-Object-Remote.git /var/lib/mock/f45-build-25510-611/root/chroot_tmpdir/scmroot/perl-Object-Remote
Cloning into '/var/lib/mock/f45-build-25510-611/root/chroot_tmpdir/scmroot/perl-Object-Remote'...
$ git fetch origin 50f79f4efe0d8115827769acf480e30eaeaad7d1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Object-Remote
 * [new ref]         50f79f4efe0d8115827769acf480e30eaeaad7d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 50f79f4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild