[jayhemnani9910]

Two differences in tar -tvf from GNU tar 1.35:

• an entry without user and group names lists as / instead of the numeric ids. Archives created by this tar carry no names, so listing them shows

  -rw-rw-r-- /        2 2020-01-01 00:00 f        # GNU: -rw-rw-r-- 1000/1000         2 2020-01-01 00:00 f
  

• the size is padded to 8 columns. GNU keeps owner/group size 19 columns wide and, after an entry that needs more, keeps the wider column for the rest of the listing:

  -rw-r--r-- po/po             2 1970-01-01 00:00 named.txt
  -rw-r--r-- averyveryverylongusername/gg 2 1970-01-01 00:00 long.txt
  -rw-r--r-- po/po                        2 1970-01-01 00:00 after.txt
  

format_verbose_entry now falls back to the uid and gid when a name is empty, and list_archive keeps the column width across entries (starting at 19, growing to fit), with the size right-aligned in what is left after owner/group .

New test test_list_verbose_owner_and_size_columns uses GNU tar's output for the same archive (fails on main). cargo test --workspace: test_tar 69 pass (68 on main), cargo clippy --workspace --all-targets clean. Listed six archives (made by GNU tar, by this tar, with a 200 KB file, with a long owner name, and with names and ids mixed) with GNU tar and with this branch: identical output.

Independent of the open -v extract change (different file).

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[codspeed]

Merging this PR will not alter performance

1 warning

⚠️ 4 benchmarks are dominated by system calls

System calls cannot be simulated consistently and are left out of the measure. The reported value understates the real cost. Switch to the Walltime instrument to measure them.

Learn more about system calls

See affected benchmarks

✅ 7 untouched benchmarks

---

_{Comparing jayhemnani9910:list-verbose-owner-width (9954549) with main (13e7b00)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.28%. Comparing base (791ae26) to head (9954549).
⚠️ Report is 106 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #421      +/-   ##
==========================================
+ Coverage   96.84%   98.28%   +1.43%     
==========================================
  Files          11       15       +4     
  Lines        1492     2046     +554     
  Branches       29       41      +12     
==========================================
+ Hits         1445     2011     +566     
+ Misses         46       34      -12     
  Partials        1        1              

Flag	Coverage Δ
macos_latest	98.28% <100.00%> (+1.43%)	⬆️
ubuntu_latest	98.28% <100.00%> (+1.43%)	⬆️
windows_latest	0.00% <0.00%> (ø)

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