$ git clone -n https://src.fedoraproject.org/rpms/arm-image-installer.git /var/lib/mock/f42-build-side-1-3533169-46342/root/chroot_tmpdir/scmroot/arm-image-installer
Cloning into '/var/lib/mock/f42-build-side-1-3533169-46342/root/chroot_tmpdir/scmroot/arm-image-installer'...
$ git fetch origin 9e8078e1a07ae3d32bc9caa5a3cf9fa1b0877242:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/arm-image-installer
 * [new ref]         9e8078e1a07ae3d32bc9caa5a3cf9fa1b0877242 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9e8078e Add update-x13s-bios to files