$ git clone -n https://src.fedoraproject.org/rpms/rust-curve25519-dalek.git /var/lib/mock/f41-build-746601-13356/root/chroot_tmpdir/scmroot/rust-curve25519-dalek
Cloning into '/var/lib/mock/f41-build-746601-13356/root/chroot_tmpdir/scmroot/rust-curve25519-dalek'...
$ git fetch origin 3af66c91551ac27c960678514d7b37b00d748ed9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-curve25519-dalek
 * [new ref]         3af66c91551ac27c960678514d7b37b00d748ed9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3af66c9 Temporarily disable tests on s390x to work around rustc / LLVM issues