$ git clone -n https://src.fedoraproject.org/rpms/libdatachannel.git /var/lib/mock/f41-build-858773-168473/root/chroot_tmpdir/scmroot/libdatachannel
Cloning into '/var/lib/mock/f41-build-858773-168473/root/chroot_tmpdir/scmroot/libdatachannel'...
$ git fetch origin 08f2c9b8969977e22f42b049c2beed770210c800:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libdatachannel
 * [new ref]         08f2c9b8969977e22f42b049c2beed770210c800 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 08f2c9b Set cmake build type