$ git clone -n https://src.fedoraproject.org/rpms/dolfin.git /var/lib/mock/f42-build-864745-172559/root/chroot_tmpdir/scmroot/dolfin
Cloning into '/var/lib/mock/f42-build-864745-172559/root/chroot_tmpdir/scmroot/dolfin'...
$ git fetch origin cca5d24b3b7556142aa31ff4cad0fc26adbdf35d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dolfin
 * [new ref]         cca5d24b3b7556142aa31ff4cad0fc26adbdf35d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cca5d24 Rebuild for petsc-3.22.2 (rhbz#2335160)