$ git clone -n https://src.fedoraproject.org/rpms/rust-proptest-derive0.3.git /var/lib/mock/f41-build-side-1-3134891-39763/root/chroot_tmpdir/scmroot/rust-proptest-derive0.3
Cloning into '/var/lib/mock/f41-build-side-1-3134891-39763/root/chroot_tmpdir/scmroot/rust-proptest-derive0.3'...
$ git fetch origin b0822b09319cd39cc4616ac73c7cb746aa8953f7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-proptest-derive0.3
 * [new ref]         b0822b09319cd39cc4616ac73c7cb746aa8953f7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0822b0 compat package no longer needed