$ git clone -n https://src.fedoraproject.org/rpms/rust-rusty_paserk.git /var/lib/mock/f42-build-side-1-3511143-46047/root/chroot_tmpdir/scmroot/rust-rusty_paserk
Cloning into '/var/lib/mock/f42-build-side-1-3511143-46047/root/chroot_tmpdir/scmroot/rust-rusty_paserk'...
$ git fetch origin e715eb4fb0a5511baf3fa60db3b6442765a26331:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rusty_paserk
 * [new ref]         e715eb4fb0a5511baf3fa60db3b6442765a26331 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e715eb4 Allow libtest-mimic 0.8