$ git clone -n https://src.fedoraproject.org/rpms/popub.git /var/lib/mock/f39-build-1592206-38309/root/chroot_tmpdir/scmroot/popub
Cloning into '/var/lib/mock/f39-build-1592206-38309/root/chroot_tmpdir/scmroot/popub'...
$ git fetch origin 89f6bebf3d9e3b9f11b74853fbc4f6df755470b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/popub
 * [new ref]         89f6bebf3d9e3b9f11b74853fbc4f6df755470b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 89f6beb Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild