From: Aaron Burrow <burrows@fastmail.com>
Date: Thu, 9 Apr 2026 19:06:13 +0000 (+0000)
Subject: patch 9.2.0325: runtime(tar): bug in zstd handling
X-Git-Tag: v9.2.0325^0
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=00285c035aa7d92971bc50b7b124e1408dda53ad;p=thirdparty%2Fvim.git

patch 9.2.0325: runtime(tar): bug in zstd handling

Problem:  patch 9.2.0325: runtime(tar): bug in zstd handling
Solution: use correct --zstd argument, separated from other arguments,
          rework testing framework (Aaron Burrow).

The tar.vim plugin allows vim to read and manipulate zstd archives,
but it had a bug that caused extraction attempts to fail.
Specifically, if the archive has a .tar.zst or .tzst extension, then
the code was generating invalid extraction commands that looked like
this:

  tar --zstdpxf foo.tar.zst foo

When they should be like this:

  tar --zstd -pxf foo.tar.zst foo

This patch changes the flag manipulation logic so that --zstd isn't
glued to pxf.

The labor for this change was divided between ChatGPT 5.4 and me.
ChatGPT 5.4 identified the issue (from a code scan?), and I wrote
the patch and tested vim.

related: #19930

Signed-off-by: Aaron Burrow <burrows@fastmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
---

diff --git a/runtime/autoload/tar.vim b/runtime/autoload/tar.vim
index 110327e95b..b068bd181b 100644
--- a/runtime/autoload/tar.vim
+++ b/runtime/autoload/tar.vim
@@ -21,6 +21,7 @@
 "   2026 Feb 06 by Vim Project: consider 'nowrapscan' (#19333)
 "   2026 Feb 07 by Vim Project: make the path traversal detection more robust (#19341)
 "   2026 Apr 06 by Vim Project: fix bugs with lz4 support (#19925)
+"   2026 Apr 09 by Vim Project: fix bugs with zstd support (#19930)
 "
 "	Contains many ideas from Michael Toren's <tar.vim>
 "
@@ -687,7 +688,7 @@ fun! tar#Extract()
    endif
 
   elseif filereadable(tarbase.".tzst")
-   let extractcmd= substitute(extractcmd,"-","--zstd","")
+   let extractcmd= substitute(extractcmd,"-","--zstd -","")
    call system(extractcmd." ".shellescape(tarbase).".tzst ".shellescape(fname))
    if v:shell_error != 0
     call s:Msg('tar#Extract', 'error', $"{extractcmd} {tarbase}.tzst {fname}: failed!")
@@ -696,7 +697,7 @@ fun! tar#Extract()
    endif
 
   elseif filereadable(tarbase.".tar.zst")
-   let extractcmd= substitute(extractcmd,"-","--zstd","")
+   let extractcmd= substitute(extractcmd,"-","--zstd -","")
    call system(extractcmd." ".shellescape(tarbase).".tar.zst ".shellescape(fname))
    if v:shell_error != 0
     call s:Msg('tar#Extract', 'error', $"{extractcmd} {tarbase}.tar.zst {fname}: failed!")
diff --git a/src/testdir/test_plugin_tar.vim b/src/testdir/test_plugin_tar.vim
index d6dbdd7613..28cf709f85 100644
--- a/src/testdir/test_plugin_tar.vim
+++ b/src/testdir/test_plugin_tar.vim
@@ -148,56 +148,118 @@ def g:Test_tar_path_traversal_with_nowrapscan()
   bw!
 enddef
 
-def g:Test_tar_lz4_extract()
-  CheckExecutable lz4
-
-  delete('X.txt')
-  delete('Xarchive.tar')
-  delete('Xarchive.tar.lz4')
-  call writefile(['hello'], 'X.txt')
-  call system('tar -cf Xarchive.tar X.txt')
+def CreateTar(archivename: string, content: string, outputdir: string)
+  var tempdir = tempname()
+  mkdir(tempdir, 'R')
+  call writefile([content], tempdir .. '/X.txt')
+  assert_true(filereadable(tempdir .. '/X.txt'))
+  call system('tar -C ' .. tempdir .. ' -cf ' .. outputdir .. '/' .. archivename .. ' X.txt')
   assert_equal(0, v:shell_error)
+enddef
 
-  call system('lz4 -z Xarchive.tar Xarchive.tar.lz4')
+def CreateTgz(archivename: string, content: string, outputdir: string)
+  var tempdir = tempname()
+  mkdir(tempdir, 'R')
+  call writefile([content], tempdir .. '/X.txt')
+  assert_true(filereadable(tempdir .. '/X.txt'))
+  call system('tar -C ' .. tempdir .. ' -czf ' .. outputdir .. '/' .. archivename .. ' X.txt')
   assert_equal(0, v:shell_error)
+enddef
 
-  delete('X.txt')
-  delete('Xarchive.tar')
-  defer delete('Xarchive.tar.lz4')
-
-  e Xarchive.tar.lz4
-  assert_match('X.txt', getline(5))
-  :5
-  normal x
-  assert_true(filereadable('X.txt'))
-  assert_equal(['hello'], readfile('X.txt'))
-  delete('X.txt')
-  bw!
+def CreateTbz(archivename: string, content: string, outputdir: string)
+  var tempdir = tempname()
+  mkdir(tempdir, 'R')
+  call writefile([content], tempdir .. '/X.txt')
+  assert_true(filereadable(tempdir .. '/X.txt'))
+  call system('tar -C ' .. tempdir .. ' -cjf ' .. outputdir .. '/' .. archivename .. ' X.txt')
+  assert_equal(0, v:shell_error)
 enddef
 
-def g:Test_tlz4_extract()
-  CheckExecutable lz4
+def CreateTxz(archivename: string, content: string, outputdir: string)
+  var tempdir = tempname()
+  mkdir(tempdir, 'R')
+  call writefile([content], tempdir .. '/X.txt')
+  assert_true(filereadable(tempdir .. '/X.txt'))
+  call system('tar -C ' .. tempdir .. ' -cJf ' .. outputdir .. '/' .. archivename .. ' X.txt')
+  assert_equal(0, v:shell_error)
+enddef
 
-  delete('X.txt')
-  delete('Xarchive.tar')
-  delete('Xarchive.tlz4')
-  call writefile(['goodbye'], 'X.txt')
-  call system('tar -cf Xarchive.tar X.txt')
+def CreateTzst(archivename: string, content: string, outputdir: string)
+  var tempdir = tempname()
+  mkdir(tempdir, 'R')
+  call writefile([content], tempdir .. '/X.txt')
+  assert_true(filereadable(tempdir .. '/X.txt'))
+  call system('tar --zstd -C ' .. tempdir .. ' -cf ' .. outputdir .. '/' .. archivename .. ' X.txt')
   assert_equal(0, v:shell_error)
+enddef
 
-  call system('lz4 -z Xarchive.tar Xarchive.tlz4')
+def CreateTlz4(archivename: string, content: string, outputdir: string)
+  var tempdir = tempname()
+  mkdir(tempdir, 'R')
+  call writefile([content], tempdir .. '/X.txt')
+  assert_true(filereadable(tempdir .. '/X.txt'))
+  call system('tar -C ' .. tempdir .. ' -cf ' .. tempdir .. '/Xarchive.tar X.txt')
+  assert_equal(0, v:shell_error)
+  assert_true(filereadable(tempdir .. '/Xarchive.tar'))
+  call system('lz4 -z ' .. tempdir .. '/Xarchive.tar ' .. outputdir .. '/' .. archivename)
   assert_equal(0, v:shell_error)
+enddef
 
-  delete('X.txt')
-  delete('Xarchive.tar')
-  defer delete('Xarchive.tlz4')
+# XXX: Add test for .tar.bz3
+def g:Test_extraction()
+  var control = [
+    {create: CreateTar,
+     archive: 'Xarchive.tar'},
+    {create: CreateTgz,
+     archive: 'Xarchive.tgz'},
+    {create: CreateTgz,
+     archive: 'Xarchive.tar.gz'},
+    {create: CreateTbz,
+     archive: 'Xarchive.tbz'},
+    {create: CreateTbz,
+     archive: 'Xarchive.tar.bz2'},
+    {create: CreateTxz,
+     archive: 'Xarchive.txz'},
+    {create: CreateTxz,
+     archive: 'Xarchive.tar.xz'},
+  ]
+
+  if executable('lz4') == 1
+    control->add({
+      create: CreateTlz4,
+      archive: 'Xarchive.tar.lz4'
+    })
+    control->add({
+      create: CreateTlz4,
+      archive: 'Xarchive.tlz4'
+    })
+  endif
+  if executable('zstd') == 1
+    control->add({
+      create: CreateTzst,
+      archive: 'Xarchive.tar.zst'
+    })
+    control->add({
+      create: CreateTzst,
+      archive: 'Xarchive.tzst'
+    })
+  endif
 
-  e Xarchive.tlz4
-  assert_match('X.txt', getline(5))
-  :5
-  normal x
-  assert_true(filereadable('X.txt'))
-  assert_equal(['goodbye'], readfile('X.txt'))
-  delete('X.txt')
-  bw!
+  for c in control
+    var dir = tempname()
+    mkdir(dir, 'R')
+    call(c.create, [c.archive, 'hello', dir])
+
+    delete('X.txt')
+    execute 'edit ' .. dir .. '/' .. c.archive
+    assert_match('X.txt', getline(5), 'line 5 wrong in archive: ' .. c.archive)
+    :5
+    normal x
+    assert_equal(0, v:shell_error, 'vshell error not 0')
+    assert_true(filereadable('X.txt'), 'X.txt not readable for archive: ' .. c.archive)
+    assert_equal(['hello'], readfile('X.txt'), 'X.txt wrong contents for archive: ' .. c.archive)
+    delete('X.txt')
+    delete(dir .. '/' .. c.archive)
+    bw!
+  endfor
 enddef
diff --git a/src/version.c b/src/version.c
index 99a25eb7c1..5fc6428c2c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    325,
 /**/
     324,
 /**/