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tar: --one-top-level=DIR must be relative

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* src/tar.c (decode_options): Require --one-top-level operand
to be relative.
This commit is contained in:
Paul Eggert
2026-01-30 12:56:30 -08:00
parent 8fca6143ea
commit 678dbc679a
3 changed files with 19 additions and 7 deletions
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doc/tar.texi
+8 -4
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@@ -3274,10 +3274,14 @@ directory.
@opsummary{one-top-level}
@item --one-top-level[=@var{dir}]
Tells @command{tar} to create a new directory beneath the extraction directory
(or the one passed to @option{-C}) and use it to guard against
tarbombs. In the absence of @var{dir} argument, the name of the new directory
will be equal to the base name of the archive (file name minus the
archive suffix, if recognized). Any member names that do not begin
(or the one passed to @option{-C}) and use it to prevent @command{tar}
from modifying files outside that directory.
If @var{dir} is present, it must be a relative file name.
If it is absent, the name of the new directory
is the base name of the archive minus any recognized archive suffix.
If multiple @option{-C} options are present,
each has its own subdirectory with the same name.
Any member names that do not begin
with that directory name (after
transformations from @option{--transform} and
@option{--strip-components}) will be prefixed with it. Recognized