Francçois-Xavier HENG created NIFI-7950:
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Summary: TailFile processor in Multiple files mode cannot work on
Windows.
Key: NIFI-7950
URL: https://issues.apache.org/jira/browse/NIFI-7950
Project: Apache NiFi
Issue Type: Bug
Components: Core Framework
Affects Versions: 1.12.1, 1.11.4
Environment: Windows
Reporter: Francçois-Xavier HENG
On windows TailFile can not work for "Tailing mode" = Multiple files.
I'm not good enough with apache lib to correct this alone but here is the
faulty part:
In
nifi/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/TailFile.java,
line 409:
_ /**
* Method to list the files to tail according to the given base directory
* and using the user-provided regular expression
* @param baseDir base directory to recursively look into
* @param fileRegex expression regular used to match files to tail
* @param isRecursive true if looking for file recursively, false otherwise
* @return List of files to tail
*/_
private List<String> getFilesToTail(final String baseDir, String fileRegex,
boolean isRecursive, long maxAge) {
final Collection<File> files = FileUtils.listFiles(new File(baseDir),
null, isRecursive);
final List<String> result = new ArrayList<String>();
final String baseDirNoTrailingSeparator =
baseDir.endsWith(File.separator) ? baseDir.substring(0, baseDir.length() - 1) :
baseDir;
final String fullRegex;
if (File.separator.equals("/")) {
// handle unix-style paths
fullRegex = baseDirNoTrailingSeparator + File.separator + fileRegex;
} else {
// handle windows-style paths, need to quote backslash characters
fullRegex = baseDirNoTrailingSeparator +
Pattern.quote(File.separator) + fileRegex;
}
final Pattern p = Pattern.compile(fullRegex);
On windows the separator is the regexp exape char '\'. The windows path cannot
be turn in a usable regexp.
Only workaround is to double slash the windows path after removing last
trailing '\'.
Solution maybe to escape all separator in the variable
baseDirNoTrailingSeparator.
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