$ git clone -n https://src.fedoraproject.org/rpms/ghc-stringbuilder.git /var/lib/mock/f42-build-878092-180451/root/chroot_tmpdir/scmroot/ghc-stringbuilder
Cloning into '/var/lib/mock/f42-build-878092-180451/root/chroot_tmpdir/scmroot/ghc-stringbuilder'...
$ git fetch origin 0e71295d2beb9bad82b203635c06134e7f3f32aa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-stringbuilder
 * [new ref]         0e71295d2beb9bad82b203635c06134e7f3f32aa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0e71295 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild