$ git clone -n https://src.fedoraproject.org/rpms/libxslt.git /var/lib/mock/f39-build-1844317-42052/root/chroot_tmpdir/scmroot/libxslt
Cloning into '/var/lib/mock/f39-build-1844317-42052/root/chroot_tmpdir/scmroot/libxslt'...
$ git fetch origin 26ce4a23df476aab79dc4b4ddcd00ae99db538cc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libxslt
 * [new ref]         26ce4a23df476aab79dc4b4ddcd00ae99db538cc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 26ce4a2 1.1.39