$ git clone -n https://src.fedoraproject.org/rpms/proxygen.git /var/lib/mock/f38-build-side-42-init-devel-1284972-30672/root/chroot_tmpdir/scmroot/proxygen
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1284972-30672/root/chroot_tmpdir/scmroot/proxygen'...
$ git fetch origin b38fb53b3f4fd2c87893451c6e0c7a08bc534958:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/proxygen
 * [new ref]         b38fb53b3f4fd2c87893451c6e0c7a08bc534958 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b38fb53 Update to 2023.07.03.00