$ git clone -n https://src.fedoraproject.org/rpms/rust-signature_derive1.git /var/lib/mock/f41-build-1283334-23209/root/chroot_tmpdir/scmroot/rust-signature_derive1
Cloning into '/var/lib/mock/f41-build-1283334-23209/root/chroot_tmpdir/scmroot/rust-signature_derive1'...
$ git fetch origin 177d31987b19a3791f2b03ff868936002020e6f7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-signature_derive1
 * [new ref]         177d31987b19a3791f2b03ff868936002020e6f7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 177d319 compat package no longer needed