$ git clone -n https://src.fedoraproject.org/rpms/rust-signature_derive1.git /var/lib/mock/f38-build-side-42-init-devel-1396438-31050/root/chroot_tmpdir/scmroot/rust-signature_derive1
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1396438-31050/root/chroot_tmpdir/scmroot/rust-signature_derive1'...
$ git fetch origin c712777070a70624b4694877d4ca05dce0804ef1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-signature_derive1
 * [new ref]         c712777070a70624b4694877d4ca05dce0804ef1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c712777 Initial import (signature_derive 1 compat package)