$ git clone -n https://src.fedoraproject.org/rpms/rust-pest_generator.git /var/lib/mock/f40-build-2271196-54875/root/chroot_tmpdir/scmroot/rust-pest_generator
Cloning into '/var/lib/mock/f40-build-2271196-54875/root/chroot_tmpdir/scmroot/rust-pest_generator'...
$ git fetch origin a7feba363f7c0e02c7aeac6af8806b09fc61503a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pest_generator
 * [new ref]         a7feba363f7c0e02c7aeac6af8806b09fc61503a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a7feba3 Update to version 2.7.6; Fixes RHBZ#2240743