$ git clone -n https://src.fedoraproject.org/rpms/keychain.git /var/lib/mock/f40-build-2227354-53013/root/chroot_tmpdir/scmroot/keychain
Cloning into '/var/lib/mock/f40-build-2227354-53013/root/chroot_tmpdir/scmroot/keychain'...
$ git fetch origin 7c5e4164529995acf8c83042a218f64e226a5664:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/keychain
 * [new ref]         7c5e4164529995acf8c83042a218f64e226a5664 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7c5e416 Suppress grep error messages.