rok commented on code in PR #50992:
URL: https://github.com/apache/arrow/pull/50992#discussion_r3857775182


##########
compose.yaml:
##########
@@ -507,7 +507,7 @@ services:
     shm_size: *shm-size
     ulimits: *ulimits
     environment:
-      <<: [*common, *ccache, *cpp]
+      <<: [*common, *ccache, *sccache, *cpp]

Review Comment:
   I didn't manage to check if this tracks, but my AI reviewer wrote:
   
   > ubuntu-cpp-bundled-offline sets ARROW_OFFLINE=ON. In 
ci/scripts/cpp_build.sh, this clears /etc/resolv.conf before compilation. With 
*sccache added, Crossbow supplies SCCACHE_BUCKET and CMake selects remote 
sccache instead of local ccache.
   >
   > On its first compiler invocation, sccache verifies the S3 backend. With 
networking disabled, server startup fails and compilation exits rather than 
falling back. I reproduced this using sccache 0.12.0 against an unreachable S3 
endpoint.



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