$ git clone -n https://src.fedoraproject.org/rpms/rust-async-compression.git /var/lib/mock/f40-build-2477593-61602/root/chroot_tmpdir/scmroot/rust-async-compression
Cloning into '/var/lib/mock/f40-build-2477593-61602/root/chroot_tmpdir/scmroot/rust-async-compression'...
$ git fetch origin f41316da00d666e7e20b1acf6552d32cfaa71212:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-async-compression
 * [new ref]         f41316da00d666e7e20b1acf6552d32cfaa71212 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f41316d Update to version 0.4.6; Fixes RHBZ#2243843