$ git clone -n https://src.fedoraproject.org/rpms/rust-test-log.git /var/lib/mock/f40-build-703989-12986/root/chroot_tmpdir/scmroot/rust-test-log
Cloning into '/var/lib/mock/f40-build-703989-12986/root/chroot_tmpdir/scmroot/rust-test-log'...
$ git fetch origin ee3e2c02aa0e73a57d829d1992f4d05d5c5c8413:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-test-log
 * [new ref]         ee3e2c02aa0e73a57d829d1992f4d05d5c5c8413 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ee3e2c0 Update to version 0.2.15; Fixes RHBZ#2253304