$ git clone -n https://src.fedoraproject.org/rpms/acme-tiny.git /var/lib/mock/f40-build-2216895-52526/root/chroot_tmpdir/scmroot/acme-tiny
Cloning into '/var/lib/mock/f40-build-2216895-52526/root/chroot_tmpdir/scmroot/acme-tiny'...
$ git fetch origin 11b4bc888d591b6b1e87eb1f8165e0c1efc29464:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/acme-tiny
 * [new ref]         11b4bc888d591b6b1e87eb1f8165e0c1efc29464 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 11b4bc8 Undo sourcing dropin script, instead pass vars as env