$ git clone -n https://src.fedoraproject.org/rpms/rust-scrypt.git /var/lib/mock/f38-build-side-43-rust-devel-1415470-31454/root/chroot_tmpdir/scmroot/rust-scrypt
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1415470-31454/root/chroot_tmpdir/scmroot/rust-scrypt'...
$ git fetch origin fb4df29e9c2bdeb4a0e8e0af9a36af96c80650b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-scrypt
 * [new ref]         fb4df29e9c2bdeb4a0e8e0af9a36af96c80650b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb4df29 Update to version 0.11.0; Fixes RHBZ#2055918