HADOOP-19599. Fix file permission errors as per the platform

[GauthamBanasandra]

Description of PR

• The file permission denial error message in Linux systems end with (Permission denied) particularly.
• However, an error message in the same scenario on Windows ends with an (Access is denied) error.
• This PR fixes the resulting bug in org.apache.hadoop.fs.ChecksumFileSystem.ChecksumFSInputChecker and also fixes the unit test failure org.apache.hadoop.fs.TestFsShellCopy#testPutSrcFileNoPerm by making the appropriate check in accordance with the platform.

How was this patch tested?

1. Ran the unit test locally (for Windows).
2. CI validation (for Windows and Linux).

For code changes:

• Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
• Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
• If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

[Copilot]

Pull Request Overview

This PR fixes file permission error messages in Hadoop by adjusting the logic for both Windows and Linux platforms. Key changes include:

• Updating the unit test in TestFsShellCopy to assert platform-specific error messages.
• Refactoring ChecksumFileSystem to use a helper method (isPermissionDenied) for detecting permission denied errors.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
hadoop-common/src/test/java/org/apache/hadoop/fs/TestFsShellCopy.java	Adjusts error message assertion to handle Windows "(Access is denied)" and Linux "(Permission denied)" messages.
hadoop-common/src/main/java/org/apache/hadoop/fs/ChecksumFileSystem.java	Introduces a helper method to encapsulate permission denied error detection based on platform.

[hadoop-yetus]

🎊 +1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	0m 34s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
+1 💚	test4tests	0m 0s		The patch appears to include 1 new or modified test files.
			_ trunk Compile Tests _
+1 💚	mvninstall	40m 27s		trunk passed
+1 💚	compile	17m 39s		trunk passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	compile	15m 14s		trunk passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	checkstyle	1m 15s		trunk passed
+1 💚	mvnsite	1m 39s		trunk passed
+1 💚	javadoc	1m 19s		trunk passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	javadoc	0m 54s		trunk passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	spotbugs	2m 44s		trunk passed
+1 💚	shadedclient	40m 34s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 56s		the patch passed
+1 💚	compile	15m 6s		the patch passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	javac	15m 6s		the patch passed
+1 💚	compile	13m 56s		the patch passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	javac	13m 56s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	checkstyle	1m 14s		the patch passed
+1 💚	mvnsite	1m 39s		the patch passed
+1 💚	javadoc	1m 13s		the patch passed with JDK Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04
+1 💚	javadoc	0m 55s		the patch passed with JDK Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
+1 💚	spotbugs	2m 44s		the patch passed
+1 💚	shadedclient	37m 28s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	23m 11s		hadoop-common in the patch passed.
+1 💚	asflicense	1m 3s		The patch does not generate ASF License warnings.
		223m 7s

Subsystem	Report/Notes
Docker	ClientAPI=1.51 ServerAPI=1.51 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7767/1/artifact/out/Dockerfile
GITHUB PR	#7767
Optional Tests	dupname asflicense compile javac javadoc mvninstall mvnsite unit shadedclient spotbugs checkstyle codespell detsecrets
uname	Linux 025cb87d9eff 5.15.0-139-generic #149-Ubuntu SMP Fri Apr 11 22:06:13 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / f8aa659
Default Java	Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
Multi-JDK versions	/usr/lib/jvm/java-11-openjdk-amd64:Ubuntu-11.0.27+6-post-Ubuntu-0ubuntu120.04 /usr/lib/jvm/java-8-openjdk-amd64:Private Build-1.8.0_452-8u452-gaus1-0ubuntu120.04-b09
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7767/1/testReport/
Max. process+thread count	1271 (vs. ulimit of 5500)
modules	C: hadoop-common-project/hadoop-common U: hadoop-common-project/hadoop-common
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-7767/1/console
versions	git=2.25.1 maven=3.6.3 spotbugs=4.2.2
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[ASHISH-RANJAN59]

LGTM

[ayushtkn]

LGTM