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From 18112ded916cf62b3bd3c0ffb9530e4ade3d2209 Mon Sep 17 00:00:00 2001
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From: rpm-build <rpm-build>
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Date: Mon, 28 Jul 2014 08:16:33 +0200
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Subject: [PATCH 7/9] Document exclude mistakes with
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.. usually with --no-wildcards-match-slash & --anchored options.
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Upstream bugreport (still downstream):
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http://www.mail-archive.com/bug-tar@gnu.org/msg04488.html
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Related: #903666
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---
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doc/tar.texi | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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1 file changed, 67 insertions(+)
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diff --git a/doc/tar.texi b/doc/tar.texi
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index a000f3f..2695d22 100644
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--- a/doc/tar.texi
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+++ b/doc/tar.texi
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@@ -8051,6 +8051,73 @@ The following table summarizes pattern-matching default values:
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@item Exclusion @tab @option{--wildcards --no-anchored --wildcards-match-slash}
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@end multitable
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+@subsubsection Wildcard matching confusion
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+Using of @option{--[no-]anchored} and @option{--[no-]wildcards-match-slash}
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+was proven to make confusion. The reasons for this are probably different
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+default setting for inclusion and exclusion patterns (in general: you shouldn't
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+rely on defaults if possible) and maybe also because when using any of these two
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+options, the position on command line matters (these options should be placed
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+prior to the member name on command line).
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+
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+@noindent
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+Consider following directory structure:
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+
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+@smallexample
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+$ find path/ | sort
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+path/
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+path/file1
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+path/file2
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+path/subpath
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+path/subpath/file1
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+path/subpath/file2
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+path/subpath2
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+path/subpath2/file1
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+path/subpath2/file2
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+@end smallexample
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+
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+@noindent
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+To archive full directory @samp{path} except all files named @samp{file1} may be
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+reached by any of the two following commands:
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+
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+@smallexample
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+$ tar -cf a.tar --no-wildcards-match-slash --no-anchored path \
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+ --exclude='*/file1'
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+$ tar -cf a.tar --wildcards-match-slash path --exclude='*/file1'
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+@end smallexample
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+
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+@noindent
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+Note that the @option{--wildcards-match-slash} and @option{--no-anchored} may be
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+omitted as it is default for @option{--exclude}. Anyway, we usually want just
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+concrete file (or rather subset of files with the same name). Assume we want
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+exclude only files named @samp{file1} from the first subdirectory level.
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+Following command obviously does not work (it still excludes all files having
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+@samp{file1} name):
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+
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+@smallexample
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+$ tar -cf a.tar --no-wildcards-match-slash path \
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+ --exclude='*/file1' | sort
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+@end smallexample
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+
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+@noindent
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+This is because the @option{--no-anchored} is set by default for exclusion.
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+What you need to fix is to put @option{--anchored} before pathname:
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+
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+@smallexample
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+$ tar -cvf a.tar --no-wildcards-match-slash --anchored path \
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+ --exclude='*/file1' | sort
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+path/
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+path/file2
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+path/subpath1/
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+path/subpath1/file1
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+path/subpath1/file2
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+path/subpath2/
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+path/subpath2/file1
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+path/subpath2/file2
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+@end smallexample
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+
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+@noindent
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+Similarly you can exclude second level by specifying @samp{*/*/file1}.
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+
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@node quoting styles
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@section Quoting Member Names
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--
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1.9.3
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