$ git clone -n https://src.fedoraproject.org/rpms/rust-hashbrown.git /var/lib/mock/f38-build-side-43-rust-devel-1419882-31460/root/chroot_tmpdir/scmroot/rust-hashbrown
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1419882-31460/root/chroot_tmpdir/scmroot/rust-hashbrown'...
$ git fetch origin 4435ffe6bf49746b6d33bb87d59a2accd9265420:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-hashbrown
 * [new ref]         4435ffe6bf49746b6d33bb87d59a2accd9265420 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4435ffe Update to version 0.14.1; Fixes RHBZ#2241296