[Tile-serving] [osm2pgsql-dev/osm2pgsql] How can I figure out exactly what ways (roads, tracks) have changed based on an OSC OsmChange file? (Discussion #2144)

[ImreSamu]

my answer : 
* https://community.openstreetmap.org/t/how-can-i-reliably-get-all-changed-updated-ways-based-on-an-osc-changefile/110766/3


#### TLDR version: 

using  2x  "osmium getparents"   ( https://docs.osmcode.org/osmium/latest/osmium-getparents.html )
draft code:
```
osmium cat -f opl 004.osc.gz | cut -d' ' -f1 > changes00.id
osmium getparents hungary-latest.osm.pbf --add-self --id-file changes00.id -f opl | cut -d' ' -f1 > changes01.id
osmium getparents hungary-latest.osm.pbf --add-self --id-file changes01.id -f opl | cut -d' ' -f1 > changes02.id
```
and reading to postgres ...

Managing false positive changes, such as changes to a 'fixme' tag, is more complex.


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