$ git clone -n https://src.fedoraproject.org/rpms/minisign.git /var/lib/mock/f40-build-2242831-53669/root/chroot_tmpdir/scmroot/minisign
Cloning into '/var/lib/mock/f40-build-2242831-53669/root/chroot_tmpdir/scmroot/minisign'...
$ git fetch origin e3ea588de5f16984a54889ee95b5430d5441b4b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/minisign
 * [new ref]         e3ea588de5f16984a54889ee95b5430d5441b4b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e3ea588 normal build