$ git clone -n https://src.fedoraproject.org/rpms/rust-librsvg.git /var/lib/mock/f40-build-2678177-67917/root/chroot_tmpdir/scmroot/rust-librsvg
Cloning into '/var/lib/mock/f40-build-2678177-67917/root/chroot_tmpdir/scmroot/rust-librsvg'...
$ git fetch origin 0fc3cda539d95ddeeadf6bde5e4eb8d7819b301d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-librsvg
 * [new ref]         0fc3cda539d95ddeeadf6bde5e4eb8d7819b301d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0fc3cda Update to version 2.58.0; Fixes RHBZ#2268616