$ git clone -n https://src.fedoraproject.org/rpms/xkeyboard-config.git /var/lib/mock/f39-build-1445694-32653/root/chroot_tmpdir/scmroot/xkeyboard-config
Cloning into '/var/lib/mock/f39-build-1445694-32653/root/chroot_tmpdir/scmroot/xkeyboard-config'...
$ git fetch origin 5be77539aa99a1c2c481c92634e9e069a909c80d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xkeyboard-config
 * [new ref]         5be77539aa99a1c2c481c92634e9e069a909c80d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5be7753 xkeyboard-config 2.40