$ git clone -n https://src.fedoraproject.org/rpms/gprbuild.git /var/lib/mock/f38-build-side-42-init-devel-1119540-30223/root/chroot_tmpdir/scmroot/gprbuild
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1119540-30223/root/chroot_tmpdir/scmroot/gprbuild'...
$ git fetch origin 50c2ffea77e46bb366735f5e8d9667d2f55043b7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gprbuild
 * [new ref]         50c2ffea77e46bb366735f5e8d9667d2f55043b7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 50c2ffe Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild