$ git clone -n https://src.fedoraproject.org/rpms/libxmlb.git /var/lib/mock/f38-build-686036-81043/root/chroot_tmpdir/scmroot/libxmlb
Cloning into '/var/lib/mock/f38-build-686036-81043/root/chroot_tmpdir/scmroot/libxmlb'...
$ git reset --hard 21c1821f6d466ac7f259b80727349720fab75d80
HEAD is now at 21c1821 New upstream release