Fix workflow to deal with different jar location

The convert-tool build is done via a different build command
to run a single jar. Because the jar location is used to find the root
of the git project inside the tool (in order to find files needed for
the recipe conversion), this fails to compute the right folder.

This change introduces an env var that triggers a different computation
(since it's only needed for the github workflow, it was better than
adding a command line args -- also it seems like the parser API only
supports (key, value) pair type of arguments)

Bug: N/A
Test: N/A
Change-Id: I12b33be19dc92f04a17a14ec70d93bf4e5db5757

.github/workflows/convert-recipes.yml

@@ -43,7 +43,7 @@ jobs:
             echo "Working on branch $BRANCH in $BRANCH_DIR"
             mkdir $BRANCH_DIR
             cp -r .git "$BRANCH_DIR/.git"
-            java -jar convert-tool/app/build/libs/recipes-converter-all.jar \
+            STANDALONE_JAR=true java -jar convert-tool/app/build/libs/recipes-converter-all.jar \
                       convert --sourceAll recipes \
                       --destination "$BRANCH_DIR" \
                       --agpVersion "$AGP" --gradleVersion "$GRADLE" --overwrite

convert-tool/app/src/main/kotlin/com/google/android/gradle_recipe/converter/ConvertTool.kt

@@ -74,7 +74,7 @@ fun main(args: Array<String>) {
             "Convert one or more recipes from one state to the other (default mode is $RELEASE)"
         ) {
             override fun execute() {
-                val branchRoot = computeGitHubRootFolder()
+                val branchRoot = computeGitRootFolder()
 
                 val finalSource = source
                 val finalSourceAll = sourceAll
@@ -135,7 +135,7 @@ fun main(args: Array<String>) {
                 validateNullArg(gradleVersion, "'gradleVersion' must not be provided for subcommand '$COMMAND_VALIDATE'")
                 validateNullArg(gradlePath, "'gradlePath' must not be provided for subcommand '$COMMAND_VALIDATE'")
 
-                val branchRoot = computeGitHubRootFolder()
+                val branchRoot = computeGitRootFolder()
 
                 // check the env var for the SDK exist
                 if (System.getenv("ANDROID_HOME") == null) {
@@ -200,7 +200,7 @@ fun main(args: Array<String>) {
                         ?: printErrorAndTerminate("'repoLocation' must not be null with subcommand '$COMMAND_VALIDATE_CI'"),
                     gradlePath = gradlePath
                         ?: printErrorAndTerminate("'gradlePath' must not be null with subcommand '$COMMAND_VALIDATE_CI'"),
-                    branchRoot = computeGitHubRootFolder(),
+                    branchRoot = computeGitRootFolder(),
                 )
                 validator.validate(
                     sourceAll = Path.of(
@@ -221,13 +221,27 @@ fun main(args: Array<String>) {
     }
 }
 
-private fun computeGitHubRootFolder(): Path {
+/**
+ * Compute the root of the git project, in order to find files needed by the conversion logic.
+ *
+ * The logic will vary based on where the tool's jar is located. On the github workflow, this run from
+ * a different path.
+ */
+private fun computeGitRootFolder(): Path {
     val url = RecipeConverter::class.java.protectionDomain.codeSource.location
     val path = Path.of(url.toURI())
 
-    // The path is going to be $ROOT/convert-tool/app/build/install/convert-tool/lib/recipes-converter.jar
-    // we want to return $ROOT
-    return path.resolve("../../../../../../../").normalize()
+    val standaloneJar = System.getenv("STANDALONE_JAR") != null
+
+    if (standaloneJar) {
+        // The path is going to be $ROOT/convert-tool/app/build/libs/recipes-converter.jar
+        // we want to return $ROOT
+        return path.resolve("../../../../../").normalize()
+    } else {
+        // The path is going to be $ROOT/convert-tool/app/build/install/convert-tool/lib/recipes-converter.jar
+        // we want to return $ROOT
+        return path.resolve("../../../../../../../").normalize()
+    }
 }
 
 private fun validateNullArg(arg: Any?, msg: String) {