$ git clone -n https://src.fedoraproject.org/rpms/jacop.git /var/lib/mock/f38-build-side-42-init-devel-693931-26964/root/chroot_tmpdir/scmroot/jacop
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-693931-26964/root/chroot_tmpdir/scmroot/jacop'...
$ git fetch origin e264a868c93777f2dfc8899b6a6083ee51d79fa9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jacop
 * [new ref]         e264a868c93777f2dfc8899b6a6083ee51d79fa9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e264a86 Version 4.9.0