$ git clone -n https://src.fedoraproject.org/rpms/R-tikzDevice.git /var/lib/mock/f38-build-723856-99307/root/chroot_tmpdir/scmroot/R-tikzDevice
Cloning into '/var/lib/mock/f38-build-723856-99307/root/chroot_tmpdir/scmroot/R-tikzDevice'...
$ git fetch origin 2213e4ebb216814df26c5fa3be2726017874a29b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-tikzDevice
 * [new ref]         2213e4ebb216814df26c5fa3be2726017874a29b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2213e4e R-maint-sig mass rebuild