Path normilization issue when path has symlink/.. on Linux

[nhz2]

Minimal Working Example (Linux):

touch test.txt
7z a test.tar test.txt
mkdir foo
mkdir bar
ln -s ../bar foo/bar-sl

Directory structure:

.
├── test.txt
├── test.tar
├── foo
│   └── bar-sl -> ../bar
└── bar

Path resolution check (works correctly)

On Unix, foo/bar-sl/../test.tar resolves to ./test.tar because of quirk in the Unix path design.

The file command correctly handles this:

$ file foo/bar-sl/../test.tar
foo/bar-sl/../test.tar: POSIX tar archive (GNU)

7zip behavior (incorrect)

$ 7z t foo/bar-sl/../test.tar

7-Zip (z) 25.01 (x64) : Copyright (c) 1999-2025 Igor Pavlov : 2025-08-03
 64-bit locale=en_US.UTF-8 Threads:16 OPEN_MAX:1024, ASM

Scanning the drive for archives:
1 file, 1536 bytes (2 KiB)

Testing archive: foo/bar-sl/../test.tar
ERROR: foo/bar-sl/../test.tar
Cannot open the file as archive

errno=2 : No such file or directory
    
Can't open as archive: 1
Files: 0
Size:       0
Compressed: 0

It appears that 7zip is normalizing foo/bar-sl/../test.tar as foo/test.tar.

XRef: JuliaLang/julia#60251

As a workaround in JuliaLang/Pkg.jl#4538, realpath is used before passing the path to 7zip.