$ git clone -n https://src.fedoraproject.org/rpms/rubygem-scanf.git /var/lib/mock/f45-build-35286-694/root/chroot_tmpdir/scmroot/rubygem-scanf
Cloning into '/var/lib/mock/f45-build-35286-694/root/chroot_tmpdir/scmroot/rubygem-scanf'...
$ git fetch origin 7b96f60e573c4189a62fbdcee73ac4930e3f8bae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-scanf
 * [new ref]         7b96f60e573c4189a62fbdcee73ac4930e3f8bae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7b96f60 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild