$ git clone -n https://src.fedoraproject.org/rpms/libclastfm.git /var/lib/mock/f45-build-15982-481/root/chroot_tmpdir/scmroot/libclastfm
Cloning into '/var/lib/mock/f45-build-15982-481/root/chroot_tmpdir/scmroot/libclastfm'...
$ git fetch origin 50860db389397fcebc3804599898bfb8eeccea0d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libclastfm
 * [new ref]         50860db389397fcebc3804599898bfb8eeccea0d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 50860db Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild