$ git clone -n https://src.fedoraproject.org/rpms/rust-rustls.git /var/lib/mock/f38-build-side-43-rust-devel-1415467-31454/root/chroot_tmpdir/scmroot/rust-rustls
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1415467-31454/root/chroot_tmpdir/scmroot/rust-rustls'...
$ git fetch origin 225344fcd752895e7da47c758de9d11a6a4c8a84:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustls
 * [new ref]         225344fcd752895e7da47c758de9d11a6a4c8a84 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 225344f Update to version 0.21.2; Fixes RHBZ#2182860