$ git clone -n https://src.fedoraproject.org/rpms/rust-input.git /var/lib/mock/f40-build-2268941-54750/root/chroot_tmpdir/scmroot/rust-input
Cloning into '/var/lib/mock/f40-build-2268941-54750/root/chroot_tmpdir/scmroot/rust-input'...
$ git fetch origin 10c5bae7b393f96d32248c6cc2dbaffa6d4b821e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-input
 * [new ref]         10c5bae7b393f96d32248c6cc2dbaffa6d4b821e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 10c5bae Initial import; Fixes: RHBZ#2224961