suztomo commented on a change in pull request #13342:
URL: https://github.com/apache/beam/pull/13342#discussion_r524361509



##########
File path: sdks/java/build-tools/beam-linkage-check.sh
##########
@@ -36,46 +36,60 @@ set -o pipefail
 set -e
 
 # These default artifacts are common causes of linkage errors.
-ARTIFACTS="beam-sdks-java-core
-  beam-sdks-java-io-google-cloud-platform
-  beam-runners-google-cloud-dataflow-java
-  beam-sdks-java-io-hadoop-format"
-
-if [ ! -z "$1" ]; then
-  ARTIFACTS=$1
+DEFAULT_ARTIFACT_LISTS=" \
+  beam-sdks-java-core \
+  beam-sdks-java-io-google-cloud-platform \
+  beam-runners-google-cloud-dataflow-java \
+  beam-sdks-java-io-hadoop-format \
+"
+
+BASELINE_REF=$1
+PROPOSED_REF=$2
+ARTIFACT_LISTS=$3
+
+if [ -z "$ARTIFACT_LISTS" ]; then
+  ARTIFACT_LISTS=$DEFAULT_ARTIFACT_LISTS
 fi
 
-BRANCH_NAME=$(git symbolic-ref --short HEAD)
+if [ -z "$BASELINE_REF" ] || [ -z "$PROPOSED_REF" ] || [ -z "$ARTIFACT_LISTS" 
] ; then
+  echo "Usage: $0 <baseline ref> <proposed ref> [artifact lists]"
+  exit 1
+fi
 
 if [ ! -d buildSrc ]; then
-  echo "Please run this script in the Beam project root:"
-  echo "  /bin/bash sdks/java/build-tools/beam-linkage-check.sh"
-  exit 1
+  echo "Directory 'buildSrc' not found. Please run this script from the root 
directory of a clone of the Beam git repo."
 fi
 
-if [ "$BRANCH_NAME" = "master" ]; then
-  echo "Please run this script on a branch other than master"
+if [ "$BASELINE_REF" = "$PROPOSED_REF" ]; then

Review comment:
       Nice enhancement.

##########
File path: sdks/java/build-tools/beam-linkage-check.sh
##########
@@ -36,46 +36,60 @@ set -o pipefail
 set -e
 
 # These default artifacts are common causes of linkage errors.
-ARTIFACTS="beam-sdks-java-core
-  beam-sdks-java-io-google-cloud-platform
-  beam-runners-google-cloud-dataflow-java
-  beam-sdks-java-io-hadoop-format"
-
-if [ ! -z "$1" ]; then
-  ARTIFACTS=$1
+DEFAULT_ARTIFACT_LISTS=" \

Review comment:
       Comman-separated list: Linkage Checker analyzes a dependency graph 
generated from the list of artifact, as if a project depends on the list of 
artifacts. For example, running Linkage Checker for 
"io.grpc:grpc-context:1.23.0,com.google.guava:guava:28.0-jre", checks a 
dependency graph of a pseudo project that depends on the two artifacts.
   
   Space-separated list: different invocation of Linkage Checker.
   
   I will improve documentation / comments regarding this.

##########
File path: sdks/java/build-tools/beam-linkage-check.sh
##########
@@ -36,46 +36,60 @@ set -o pipefail
 set -e
 
 # These default artifacts are common causes of linkage errors.
-ARTIFACTS="beam-sdks-java-core
-  beam-sdks-java-io-google-cloud-platform
-  beam-runners-google-cloud-dataflow-java
-  beam-sdks-java-io-hadoop-format"
-
-if [ ! -z "$1" ]; then
-  ARTIFACTS=$1
+DEFAULT_ARTIFACT_LISTS=" \
+  beam-sdks-java-core \
+  beam-sdks-java-io-google-cloud-platform \
+  beam-runners-google-cloud-dataflow-java \
+  beam-sdks-java-io-hadoop-format \
+"
+
+BASELINE_REF=$1
+PROPOSED_REF=$2
+ARTIFACT_LISTS=$3
+
+if [ -z "$ARTIFACT_LISTS" ]; then
+  ARTIFACT_LISTS=$DEFAULT_ARTIFACT_LISTS
 fi
 
-BRANCH_NAME=$(git symbolic-ref --short HEAD)
+if [ -z "$BASELINE_REF" ] || [ -z "$PROPOSED_REF" ] || [ -z "$ARTIFACT_LISTS" 
] ; then
+  echo "Usage: $0 <baseline ref> <proposed ref> [artifact lists]"
+  exit 1
+fi
 
 if [ ! -d buildSrc ]; then
-  echo "Please run this script in the Beam project root:"
-  echo "  /bin/bash sdks/java/build-tools/beam-linkage-check.sh"
-  exit 1
+  echo "Directory 'buildSrc' not found. Please run this script from the root 
directory of a clone of the Beam git repo."
 fi
 
-if [ "$BRANCH_NAME" = "master" ]; then
-  echo "Please run this script on a branch other than master"
+if [ "$BASELINE_REF" = "$PROPOSED_REF" ]; then
+  echo "Baseline and proposed refs are identical; cannot compare their linkage 
errors!"
   exit 1
 fi
 
-OUTPUT_DIR=build/linkagecheck
-mkdir -p $OUTPUT_DIR
-
 if [ ! -z "$(git diff)" ]; then
   echo "Uncommited change detected. Please commit changes and ensure 'git 
diff' is empty."
   exit 1
 fi
 
+STARTING_REF=$(git rev-parse --abbrev-ref HEAD)
+function cleanup() {
+  git checkout $STARTING_REF
+}
+trap cleanup EXIT

Review comment:
       Nice!




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