btrfs work

scripts/tile_gen/extract_btrfs.sh

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+#!/usr/bin/env bash
+
+sudo umount mnt || true
+rm -rf mnt
+rm -f image.btrfs
+
+
+# make a sparse file
+# make sure it's bigger then the current OSM output
+fallocate -l 300G image.btrfs
+
+
+mkfs.btrfs -v image.btrfs
+
+# https://btrfs.readthedocs.io/en/latest/btrfs-man5.html#mount-options
+# compression: zstd:1 or lzo
+
+mkdir mnt
+sudo mount -v \
+  -t btrfs \
+  -o noacl,nobarrier,noatime,compress-force=lzo,max_inline=4096 \
+  image.btrfs mnt
+
+
+sudo chown ofm:ofm -R mnt
+
+../../tile_gen/venv/bin/python ../../tile_gen/extract.py output.mbtiles mnt/extract \
+  > "extract_out.log" 2> "extract_err.log"
+
+sudo umount mnt
+
+
+