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file: Use -S option with -z

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The file(1) manual suggests using -S (disable seccomp) with -z since
the set of system calls provided by the seccomp policy does not allow
the subprocess to run.  This is obvious when you use file -z on a
compressed file on a Linux distro that enables file's seccomp policy
(Arch does this, Fedora does not):

  $ file -zbsL lib-i586.so.zst
  Bad system call

I also fixed some incorrect text in the manual.

Thanks: Toolybird for pointing to this fix
Reported-by: David Runge
Fixes: https://github.com/libguestfs/libguestfs/issues/100
This commit is contained in:
Richard W.M. Jones
2022-11-28 10:21:00 +00:00
parent e657e45b43
commit 23986d3c4f
3 changed files with 5 additions and 6 deletions
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2
daemon/filearch.ml
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@@ -128,7 +128,7 @@ and cpio_arch magic orig_path path =
| bin :: bins ->
let bin_path = tmpdir // bin in
if is_regular_file bin_path then (
let out = command "file" ["-zb"; bin_path] in
let out = command "file" ["-zSb"; bin_path] in
file_architecture_of_magic out orig_path bin_path
)
else