$ git clone -n https://src.fedoraproject.org/rpms/plasma-mobile.git /var/lib/mock/f40-build-2726623-73122/root/chroot_tmpdir/scmroot/plasma-mobile
Cloning into '/var/lib/mock/f40-build-2726623-73122/root/chroot_tmpdir/scmroot/plasma-mobile'...
$ git fetch origin f653cf7330e874b2eefe5271dfd9325937928b45:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-mobile
 * [new ref]         f653cf7330e874b2eefe5271dfd9325937928b45 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f653cf7 Fix the fix