$ git clone -n https://src.fedoraproject.org/rpms/qownnotes.git /var/lib/mock/f39-build-1595024-38323/root/chroot_tmpdir/scmroot/qownnotes
Cloning into '/var/lib/mock/f39-build-1595024-38323/root/chroot_tmpdir/scmroot/qownnotes'...
$ git fetch origin 9488e4003aa843e0a2c8a654ced84f9fdf4448e3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qownnotes
 * [new ref]         9488e4003aa843e0a2c8a654ced84f9fdf4448e3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9488e40 build: Upload source