one more approach

.github/workflows/integration.yml

@@ -99,8 +99,6 @@ jobs:
         env:
           ARCHERY_DOCKER_USER: ${{ secrets.DOCKERHUB_USER }}
           ARCHERY_DOCKER_PASSWORD: ${{ secrets.DOCKERHUB_TOKEN }}
-          ARCHERY_INTEGRATION_WITH_NANOARROW: "1"
-          ARCHERY_INTEGRATION_WITH_RUST: "1"
         run: >
           archery docker run \
             -e ARCHERY_DEFAULT_BRANCH=${{ github.event.repository.default_branch }} \

ci/scripts/nanoarrow_build.sh

@@ -29,16 +29,14 @@ build_dir=${2}/nanoarrow
 
 if [ "${ARCHERY_INTEGRATION_WITH_NANOARROW}" -eq "0" ]; then
   echo "====================================================================="
-  echo "Not building nanoarrow"
+  echo "Not building nanoarrow because ARCHERY_INTEGRATION_WITH_NANOARROW=0"
   echo "====================================================================="
   exit 0;
 elif [ ! -d "${source_dir}" ]; then
   echo "====================================================================="
-  echo "The nanoarrow source is missing. Please clone the arrow-nanoarrow repository"
-  echo "to arrow/nanoarrow before running the integration tests:"
-  echo "  git clone https://github.com/apache/arrow-nanoarrow.git path/to/arrow/nanoarrow"
+  echo "Not building nanoarrow because '${source_dir}' does not exist"
   echo "====================================================================="
-  exit 1;
+  exit 0;
 fi
 
 set -x

ci/scripts/rust_build.sh

@@ -35,16 +35,14 @@ export PARQUET_TEST_DATA=${arrow_dir}/cpp/submodules/parquet-testing/data
 
 if [ "${ARCHERY_INTEGRATION_WITH_RUST}" -eq "0" ]; then
   echo "====================================================================="
-  echo "Not building the Rust implementation."
+  echo "Not building Rust because ARCHERY_INTEGRATION_WITH_RUST=0"
   echo "====================================================================="
   exit 0;
 elif [ ! -d "${source_dir}" ]; then
   echo "====================================================================="
-  echo "The Rust source is missing. Please clone the arrow-rs repository"
-  echo "to arrow/rust before running the integration tests:"
-  echo "  git clone https://github.com/apache/arrow-rs.git path/to/arrow/rust"
+  echo "Not building Rust because '${source_dir}' does not exist"
   echo "====================================================================="
-  exit 1;
+  exit 0;
 fi
 
 set -x

docker-compose.yml

@@ -1748,8 +1748,6 @@ services:
     volumes: *conda-volumes
     environment:
       <<: [*common, *ccache]
-      ARCHERY_INTEGRATION_WITH_NANOARROW: 0
-      ARCHERY_INTEGRATION_WITH_RUST: 0
       # Tell Archery where Arrow binaries are located
       ARROW_CPP_EXE_PATH: /build/cpp/debug
       ARROW_NANOARROW_PATH: /build/nanoarrow