File metadata overwritten even when -k (Do not overwrite existing files) is set

[brai...@heroku.com]

I'm trying to extract an archive, but leave any existing files untouched. I have tried using the -k (Do not overwrite existing files) option, and this does leave the file contents untouched, but it changes the file metadata, namely the mode and modified time. Below is a sample script demonstrating the problem. Is this a bug and/or is there an option to make -k work like --skip-old-files in GNU tar?

Demo Script

#!/usr/bin/env bash

bsdtar --version

echo "Create an archive with normal files"

rm -rf test-tar

mkdir test-tar

echo "TEST CONTENTS 1" > test-tar/1.txt

echo "TEST CONTENTS 2" > test-tar/2.txt

ls -la test-tar

bsdtar -czf test.tgz test-tar

echo "Change contents and permissions of one of the files"

echo "MORE CONTENTS" >> test-tar/2.txt

chmod 000 test-tar/2.txt

ls -la test-tar

echo "Untar the archive with -k (Do not overwrite existing files). The file contents are intact, but the file permissions have changed"

bsdtar -xzkf test.tgz

ls -la test-tar

cat test-tar/2.txt

echo "Untar the archive without"

bsdtar -xzf test.tgz

ls -la test-tar

cat test-tar/2.txt

Script Output

bsdtar 3.3.2 - libarchive 3.3.2 zlib/1.2.8 liblzma/5.2.3 bz2lib/1.0.6

Create an archive with normal files

total 16

drwxr-xr-x   4 rbrainard  wheel  136 Nov 28 11:19 .

drwxr-xr-x  11 rbrainard  wheel  374 Nov 28 11:19 ..

-rw-r--r--   1 rbrainard  wheel   16 Nov 28 11:19 1.txt

-rw-r--r--   1 rbrainard  wheel   16 Nov 28 11:19 2.txt

Change contents and permissions of one of the files

total 16

drwxr-xr-x   4 rbrainard  wheel  136 Nov 28 11:19 .

drwxr-xr-x  11 rbrainard  wheel  374 Nov 28 11:19 ..

-rw-r--r--   1 rbrainard  wheel   16 Nov 28 11:19 1.txt

----------   1 rbrainard  wheel   30 Nov 28 11:19 2.txt

Untar the archive with -k (Do not overwrite existing files). The file contents are intact, but the file permissions have changed

total 16

drwxr-xr-x   4 rbrainard  wheel  136 Nov 28 11:19 .

drwxr-xr-x  11 rbrainard  wheel  374 Nov 28 11:19 ..

-rw-r--r--   1 rbrainard  wheel   16 Nov 28 11:19 1.txt

-rw-r--r--   1 rbrainard  wheel   30 Nov 28 11:19 2.txt

TEST CONTENTS 2

MORE CONTENTS

Untar the archive without

total 16

drwxr-xr-x   4 rbrainard  wheel  136 Nov 28 11:19 .

drwxr-xr-x  11 rbrainard  wheel  374 Nov 28 11:19 ..

-rw-r--r--   1 rbrainard  wheel   16 Nov 28 11:19 1.txt

-rw-r--r--   1 rbrainard  wheel   16 Nov 28 11:19 2.txt

TEST CONTENTS 2

[Tim Kientzle]

Would you please file this as an issue on github?

This does sound like a bug, and I'd like to track it there.

Thanks,

Tim

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[brai...@heroku.com]

Logged an issue: https://github.com/libarchive/libarchive/issues/972