$ git clone -n https://src.fedoraproject.org/rpms/rust-rustls.git /var/lib/mock/f40-build-2170355-51016/root/chroot_tmpdir/scmroot/rust-rustls
Cloning into '/var/lib/mock/f40-build-2170355-51016/root/chroot_tmpdir/scmroot/rust-rustls'...
$ git fetch origin db775505876dc35804b4aa78a3c1c9cdada992fb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustls
 * [new ref]         db775505876dc35804b4aa78a3c1c9cdada992fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at db77550 Update to version 0.21.9; Fixes RHBZ#2250091