$ git clone -n https://src.fedoraproject.org/rpms/rust-similar.git /var/lib/mock/f40-build-2251220-54121/root/chroot_tmpdir/scmroot/rust-similar
Cloning into '/var/lib/mock/f40-build-2251220-54121/root/chroot_tmpdir/scmroot/rust-similar'...
$ git fetch origin 0dab57244250c1287e24f46303a5b089011c4217:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-similar
 * [new ref]         0dab57244250c1287e24f46303a5b089011c4217 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0dab572 Update to version 2.4.0; Fixes RHBZ#2256238