$ git clone -n https://src.fedoraproject.org/rpms/rust-fscommon.git /var/lib/mock/f39-build-1521652-35852/root/chroot_tmpdir/scmroot/rust-fscommon
Cloning into '/var/lib/mock/f39-build-1521652-35852/root/chroot_tmpdir/scmroot/rust-fscommon'...
$ git fetch origin 45c746b63a2c5128fa8e23181585317e9e3e1a85:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-fscommon
 * [new ref]         45c746b63a2c5128fa8e23181585317e9e3e1a85 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 45c746b Regenerate with rust2rpm v24