SymlinkAction: Avoid using Artifact.prettyPrint in error messages.

As a comment in Artifact.prettyPrint notes: https://github.com/bazelbuild/bazel/blob/5d9333540a3ee9fe270e0e44eb4cc9fed8049bab/src/main/java/com/google/devtools/build/lib/actions/Artifact.java#L841-L842 prettyPrint can be confusing; in particular, it hides the artifact's root.

Closes bazelbuild#15262.

PiperOrigin-RevId: 443271532

src/main/java/com/google/devtools/build/lib/analysis/actions/SymlinkAction.java

@@ -16,7 +16,6 @@
 
 import com.google.common.base.Preconditions;
 import com.google.common.collect.ImmutableSet;
-import com.google.common.collect.Iterables;
 import com.google.devtools.build.lib.actions.AbstractAction;
 import com.google.devtools.build.lib.actions.ActionExecutionContext;
 import com.google.devtools.build.lib.actions.ActionExecutionException;
@@ -187,7 +186,7 @@ public ActionResult execute(ActionExecutionContext actionExecutionContext)
       String message =
           String.format(
               "failed to create symbolic link '%s' to '%s' due to I/O error: %s",
-              Iterables.getOnlyElement(getOutputs()).prettyPrint(), printInputs(), e.getMessage());
+              getPrimaryOutput().getExecPathString(), printInputs(), e.getMessage());
       DetailedExitCode code = createDetailedExitCode(message, Code.LINK_CREATION_IO_EXCEPTION);
       throw new ActionExecutionException(message, e, this, false, code);
     }
@@ -206,26 +205,24 @@ private void maybeVerifyTargetIsExecutable(ActionExecutionContext actionExecutio
     try {
       // Validate that input path is a file with the executable bit set.
       if (!inputPath.isFile()) {
-        String message =
-            String.format("'%s' is not a file", getInputs().getSingleton().prettyPrint());
+        String message = String.format("'%s' is not a file", getPrimaryInput().getExecPathString());
         throw new ActionExecutionException(
             message, this, false, createDetailedExitCode(message, Code.EXECUTABLE_INPUT_NOT_FILE));
       }
       if (!inputPath.isExecutable()) {
         String message =
             String.format(
                 "failed to create symbolic link '%s': file '%s' is not executable",
-                Iterables.getOnlyElement(getOutputs()).prettyPrint(),
-                getInputs().getSingleton().prettyPrint());
+                getPrimaryOutput().getExecPathString(), getPrimaryInput().getExecPathString());
         throw new ActionExecutionException(
             message, this, false, createDetailedExitCode(message, Code.EXECUTABLE_INPUT_IS_NOT));
       }
     } catch (IOException e) {
       String message =
           String.format(
               "failed to create symbolic link '%s' to the '%s' due to I/O error: %s",
-              Iterables.getOnlyElement(getOutputs()).prettyPrint(),
-              getInputs().getSingleton().prettyPrint(),
+              getPrimaryOutput().getExecPathString(),
+              getPrimaryInput().getExecPathString(),
               e.getMessage());
       DetailedExitCode detailedExitCode =
           createDetailedExitCode(message, Code.EXECUTABLE_INPUT_CHECK_IO_EXCEPTION);
@@ -255,8 +252,8 @@ private void updateInputMtimeIfNeeded(ActionExecutionContext actionExecutionCont
       String message =
           String.format(
               "failed to touch symbolic link '%s' to the '%s' due to I/O error: %s",
-              Iterables.getOnlyElement(getOutputs()).prettyPrint(),
-              getInputs().getSingleton().prettyPrint(),
+              getPrimaryOutput().getExecPathString(),
+              getPrimaryInput().getExecPathString(),
               e.getMessage());
       DetailedExitCode code = createDetailedExitCode(message, Code.LINK_TOUCH_IO_EXCEPTION);
       throw new ActionExecutionException(message, e, this, false, code);
@@ -267,7 +264,7 @@ private String printInputs() {
     if (getInputs().isEmpty()) {
       return inputPath.getPathString();
     } else if (getInputs().isSingleton()) {
-      return getInputs().getSingleton().prettyPrint();
+      return getPrimaryInput().getExecPathString();
     } else {
       throw new IllegalStateException(
           "Inputs unexpectedly contains more than 1 element: " + getInputs());

src/test/java/com/google/devtools/build/lib/actions/ExecutableSymlinkActionTest.java

@@ -111,7 +111,7 @@ public void testFailIfInputIsNotAFile() throws Exception {
     SymlinkAction action = SymlinkAction.toExecutable(NULL_ACTION_OWNER, input, output, "progress");
     ActionExecutionException e =
         assertThrows(ActionExecutionException.class, () -> action.execute(createContext()));
-    assertThat(e).hasMessageThat().contains("'some-dir' is not a file");
+    assertThat(e).hasMessageThat().contains("'in/some-dir' is not a file");
   }
 
   @Test
@@ -125,7 +125,7 @@ public void testFailIfInputIsNotExecutable() throws Exception {
     SymlinkAction action = SymlinkAction.toExecutable(NULL_ACTION_OWNER, input, output, "progress");
     ActionExecutionException e =
         assertThrows(ActionExecutionException.class, () -> action.execute(createContext()));
-    String want = "'some-file' is not executable";
+    String want = "'in/some-file' is not executable";
       String got = e.getMessage();
     assertWithMessage(String.format("got %s, want %s", got, want))
         .that(got.contains(want))

src/test/shell/bazel/bazel_symlink_test.sh

@@ -548,7 +548,7 @@ Hello, World!
 EOF
 
   bazel build //a:a >& $TEST_log && fail "build succeeded"
-  expect_log "failed to create symbolic link 'a/a.link': file 'a/foo.txt' is not executable"
+  expect_log "failed to create symbolic link 'bazel-out/[^/]*/bin/a/a.link': file 'a/foo.txt' is not executable"
 }
 
 function test_symlink_cycle() {