$ git clone -n https://src.fedoraproject.org/rpms/rust-scrypt.git /var/lib/mock/f45-build-44719-816/root/chroot_tmpdir/scmroot/rust-scrypt
Cloning into '/var/lib/mock/f45-build-44719-816/root/chroot_tmpdir/scmroot/rust-scrypt'...
$ git fetch origin 2f7d76e29ba8ff2a81204f5c81c8e7a2b852d86f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-scrypt
 * [new ref]         2f7d76e29ba8ff2a81204f5c81c8e7a2b852d86f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2f7d76e Update to version 0.12.0; Fixes RHBZ#2460588