$ git clone -n https://src.fedoraproject.org/rpms/kf5-purpose.git /var/lib/mock/f40-build-743645-111339/root/chroot_tmpdir/scmroot/kf5-purpose
Cloning into '/var/lib/mock/f40-build-743645-111339/root/chroot_tmpdir/scmroot/kf5-purpose'...
$ git fetch origin efb10edd955401afe3258446870d4c8c0e1a77f2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-purpose
 * [new ref]         efb10edd955401afe3258446870d4c8c0e1a77f2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at efb10ed 5.111.0