$ git clone -n https://src.fedoraproject.org/rpms/folly.git /var/lib/mock/f38-build-side-42-init-devel-1107655-30076/root/chroot_tmpdir/scmroot/folly
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1107655-30076/root/chroot_tmpdir/scmroot/folly'...
$ git fetch origin daefe5b7f647f09cbfa4729f00a4a75248c6614d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/folly
 * [new ref]         daefe5b7f647f09cbfa4729f00a4a75248c6614d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at daefe5b Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild