$ git clone -n https://src.fedoraproject.org/rpms/fluent-bit.git /var/lib/mock/f39-build-2393591-60529/root/chroot_tmpdir/scmroot/fluent-bit
Cloning into '/var/lib/mock/f39-build-2393591-60529/root/chroot_tmpdir/scmroot/fluent-bit'...
$ git fetch origin 5f2ad29621c9ee60912b4b2bfb958c7c8376c1f8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fluent-bit
 * [new ref]         5f2ad29621c9ee60912b4b2bfb958c7c8376c1f8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f2ad29 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild