$ git clone -n https://src.fedoraproject.org/rpms/elementary-code.git /var/lib/mock/f40-build-800543-143605/root/chroot_tmpdir/scmroot/elementary-code
Cloning into '/var/lib/mock/f40-build-800543-143605/root/chroot_tmpdir/scmroot/elementary-code'...
$ git fetch origin 2cf10d753826be26619f19f75a19d01ae3a91421:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/elementary-code
 * [new ref]         2cf10d753826be26619f19f75a19d01ae3a91421 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2cf10d7 Update to version 7.2.0; Fixes RHBZ#2259196