$ git clone -n https://src.fedoraproject.org/rpms/bash.git /var/lib/mock/f40-build-2225770-52856/root/chroot_tmpdir/scmroot/bash
Cloning into '/var/lib/mock/f40-build-2225770-52856/root/chroot_tmpdir/scmroot/bash'...
$ git fetch origin 774b593bdc3b78d323404687a3f0c01425d419c1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bash
 * [new ref]         774b593bdc3b78d323404687a3f0c01425d419c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 774b593 Fix another C compatibility issue in the configure script