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Accept only position-sensitive (file-selection) options in file list files.

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Using such options as -f, -z, etc. is senseless in the file list file
and bypasses the option consistency checks in decode_options.  Therefore,
only options related to file selection (a.k.a position-sensitive options)
are allowed in files.

* doc/tar.texi: Document changes.
* src/common.h (tar_args): Move from tar.c
(TAR_ARGS_INITIALIZER): New macro.
* src/names.c: Declare option group identifiers as an enum.
(names_parse_opt): Special handling for ARGP_KEY_ERROR.
(names_argp): Remove static qualifier.
(names_argp_children): Remove.
* src/tar.c: Declare option group identifiers as an enum.
(parse_opt): Special handling for ARGP_KEY_INIT.
(argp_children): New static variable.
(args): Remove static variable.
(more_options): Allow only options from names_argp.
(parse_default_options): Take a pointer to struct tar_args as argument.
Replace the loc member during the call to argp_parse and restore it
afterwards.
(decode_options): Use automatic variable for args.
This commit is contained in:
Sergey Poznyakoff
2020-06-24 16:43:26 +03:00
parent 34d15af170
commit 1ff0b63f48
4 changed files with 443 additions and 369 deletions
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doc/tar.texi
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@@ -7730,9 +7730,12 @@ any leading and trailing whitespace. If the resulting string begins
with @samp{-} character, it is considered a @command{tar} option and is
processed accordingly@footnote{Versions of @GNUTAR{} up to 1.15.1
recognized only @option{-C} option in file lists, and only if the
option and its argument occupied two consecutive lines.}. For example,
the common use of this feature is to change to another directory by
specifying @option{-C} option:
option and its argument occupied two consecutive lines.}. Only a
subset of @GNUTAR{} options is allowed for use in file lists. For
a list of such options, @ref{Position-Sensitive Options}.
For example, the common use of this feature is to change to another
directory by specifying @option{-C} option:
@smallexample
@group