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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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5
generator/actions_core.ml
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@@ -2204,9 +2204,8 @@ the type or contents of the file.
This call will also transparently look inside various types
of compressed file.
The exact command which runs is C<file -zb path>. Note in
particular that the filename is not prepended to the output
(the I<-b> option).
The filename is not prepended to the output
(like the file command I<-b> option).
The output depends on the output of the underlying L<file(1)>
command and it can change in future in ways beyond our control.