#132: untar preserves unix file permissios

[MattesMrzik]

Partly fixes #132.
The untar bug of #132 is fixed. Unzipping while preserving file permissions is still missing.
Also wrote a test for untar.

[coveralls]

Pull Request Test Coverage Report for Build 7667343336

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 91 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.1%) to 55.661%

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Files with Coverage Reduction	New Missed Lines	%
com/devonfw/tools/ide/io/FileAccessImpl.java	91	54.81%

Totals
Change from base Build 7626444199:	0.1%
Covered Lines:	3533
Relevant Lines:	6099

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💛 - Coveralls

[MattesMrzik]

Currently, zip archives are unpacked using ZipArchiveInputStream. To preserve file permissions on Unix systems, the method ZipArchiveEntry.getExternalAttributes() must be used, but ZipArchiveInputStream is unable to fill this field, you must use ZipFile if you want to read entries using this attribute.

So either we refactor the unpack() method to use ZipFile instead of ZipArchiveInputStream. Or check if the file system uses posix file permissions and call a method that uses ZipFile to extract the permissions.

[hohwille]

@MattesMrzik Thanks for this PR. Great work. You nailed it from the start. 👍
Ready for merge.

[hohwille]

@MattesMrzik now the workaround (was it in AwsCommandlet) could be removed, correct?

[MattesMrzik]

@MattesMrzik now the workaround (was it in AwsCommandlet) could be removed, correct?

Not yet. Aws uses zip instead of tar and permissions are not yet conserved when extracting zip on unix.