$ git clone -n https://src.fedoraproject.org/rpms/gnustep-base.git /var/lib/mock/f39-build-1535668-36247/root/chroot_tmpdir/scmroot/gnustep-base
Cloning into '/var/lib/mock/f39-build-1535668-36247/root/chroot_tmpdir/scmroot/gnustep-base'...
$ git fetch origin 4548d9df42aadc778c7fc69272709ab1a0809f6e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnustep-base
 * [new ref]         4548d9df42aadc778c7fc69272709ab1a0809f6e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4548d9d Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild