$ git clone -n https://src.fedoraproject.org/rpms/libuv.git /var/lib/mock/f39-build-1635546-39857/root/chroot_tmpdir/scmroot/libuv
Cloning into '/var/lib/mock/f39-build-1635546-39857/root/chroot_tmpdir/scmroot/libuv'...
$ git fetch origin cb44f5394aa1e860312e45b40b6ef2104014242e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libuv
 * [new ref]         cb44f5394aa1e860312e45b40b6ef2104014242e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb44f53 libuv-devel depends on libuv.a