$ git clone -n https://src.fedoraproject.org/rpms/objfw.git /var/lib/mock/f42-build-3273860-41313/root/chroot_tmpdir/scmroot/objfw
Cloning into '/var/lib/mock/f42-build-3273860-41313/root/chroot_tmpdir/scmroot/objfw'...
$ git fetch origin 96b15bcd807d5d09ec2483cac84e7b47b07a0757:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/objfw
 * [new ref]         96b15bcd807d5d09ec2483cac84e7b47b07a0757 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 96b15bc Update to 1.2.4