$ git clone -n https://src.fedoraproject.org/rpms/rust-gix-packetline.git /var/lib/mock/f39-build-1510000-35465/root/chroot_tmpdir/scmroot/rust-gix-packetline
Cloning into '/var/lib/mock/f39-build-1510000-35465/root/chroot_tmpdir/scmroot/rust-gix-packetline'...
$ git fetch origin db5c6fb458e6149f0f20cbffd594d20a1da3cf45:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gix-packetline
 * [new ref]         db5c6fb458e6149f0f20cbffd594d20a1da3cf45 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at db5c6fb Update to version 0.16.7