[PATCH 2/2] change default --format from gnu to posix

[Mike Frysinger]

The posix standard has been released for over 20 years, and tar has
supported it for almost as long (at least since 2004).  The docs have
said the default will change in a future version for almost as long,
so lets finally actually switch it.

* NEWS: Update.
* configure.ac (DEFAULT_ARCHIVE_FORMAT): Change GNU to POSIX.
* doc/tar.texi: Update gnu & posix format sections mentioning defaults.
---
 NEWS         |  4 ++++
 configure.ac |  7 +------
 doc/tar.texi | 12 +++++-------
 3 files changed, 10 insertions(+), 13 deletions(-)

diff --git a/NEWS b/NEWS
index 84a6aea2ea76..35c75e9d7362 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,10 @@
 GNU tar NEWS - User visible changes. 2021-02-13
 Please send GNU tar bug reports to <bug-tar@gnu.org>
 
+version 1.36
+
+* Changed default --format option from gnu to posix.
+
 version 1.35
 
 * Add notice about the default format changing to POSIX.  This has been
diff --git a/configure.ac b/configure.ac
index dc45a7072207..e8e02ffb35b5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -283,10 +283,8 @@ AC_MSG_CHECKING(for default archive format)
 AC_ARG_VAR([DEFAULT_ARCHIVE_FORMAT],
            [Set the default archive format. Allowed values are: V7, OLDGNU, 
USTAR, POSIX, GNU. Default is GNU])
 
-configure_default_archive_format_selected=false
 if test -z "$DEFAULT_ARCHIVE_FORMAT"; then
-  DEFAULT_ARCHIVE_FORMAT="GNU"
-  configure_default_archive_format_selected=true
+  DEFAULT_ARCHIVE_FORMAT="POSIX"
 fi
 case $DEFAULT_ARCHIVE_FORMAT in
   V7|OLDGNU|USTAR|POSIX|GNU) ;;
@@ -295,9 +293,6 @@ esac
 AC_DEFINE_UNQUOTED(DEFAULT_ARCHIVE_FORMAT, ${DEFAULT_ARCHIVE_FORMAT}_FORMAT,
   [By default produce archives of this format])
 AC_MSG_RESULT($DEFAULT_ARCHIVE_FORMAT)
-if $configure_default_archive_format_selected; then
-  AC_MSG_WARN([The default format is changing to POSIX in a future release; 
see the README file for details])
-fi
 
 AC_MSG_CHECKING(for default archive)
 
diff --git a/doc/tar.texi b/doc/tar.texi
index 389a344800de..74dc651a7695 100644
--- a/doc/tar.texi
+++ b/doc/tar.texi
@@ -9501,7 +9501,7 @@ most @samp{posix} archives as well, with the only 
exception that any
 additional information (such as long file names etc.)@: will in such
 case be extracted as plain text files along with the files it refers to.
 
-This archive format will be the default format for future versions
+This archive format is the default format starting with version 1.36
 of @GNUTAR{}.
 
 @end table
@@ -9520,9 +9520,8 @@ formats:
 
 The default format for @GNUTAR{} is defined at compilation
 time.  You may check it by running @command{tar --help}, and examining
-the last lines of its output.  Usually, @GNUTAR{} is configured
-to create archives in @samp{gnu} format, however, future version will
-switch to @samp{posix}.
+the last lines of its output.  Historically, @GNUTAR{} was configured
+to create archives in @samp{gnu} format, however, it now uses @samp{posix}.
 
 @menu
 * Compression::                 Using Less Space through Compression
@@ -10380,9 +10379,8 @@ other purposes.  As a result, @GNUTAR{} format is
 incompatible with the current @acronym{POSIX} specification, and with
 @command{tar} programs that follow it.
 
-In the majority of cases, @command{tar} will be configured to create
-this format by default.  This will change in future releases, since
-we plan to make @samp{POSIX} format the default.
+Historically, @command{tar} was commonly configured to create this format
+by default.  This changed starting from version 1.36 to @samp{POSIX}.
 
 To force creation a @GNUTAR{} archive, use option
 @option{--format=gnu}.
-- 
2.33.0