$ git clone -n https://src.fedoraproject.org/rpms/plasma-activities.git /var/lib/mock/f41-build-823946-153914/root/chroot_tmpdir/scmroot/plasma-activities
Cloning into '/var/lib/mock/f41-build-823946-153914/root/chroot_tmpdir/scmroot/plasma-activities'...
$ git fetch origin 05b361e29c2c17992eb5a27b7f427bb3c20826b7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-activities
 * [new ref]         05b361e29c2c17992eb5a27b7f427bb3c20826b7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 05b361e rebuild