95 lines
3.2 KiB
Diff
95 lines
3.2 KiB
Diff
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From 9d1993f651d72f78b2afe416c72b1aeb0c1215ab Mon Sep 17 00:00:00 2001
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From: Sergey Poznyakoff <gray@gnu.org>
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Date: Fri, 28 Dec 2018 17:49:08 +0200
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Subject: [PATCH 41/58] Work over a bug in gnulib error()
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The error() function from glibc correctly prefixes each message it
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prints with program_name as set by set_program_name. However, its
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replacement from gnulib, which is linked in on systems where this
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function is not available, prints the name returned by getprogname()
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instead. Due to this messages output by tar subprocess (which sets its
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program name to 'tar (child)') become indiscernible from those printed
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by the main process. In particular, this breaks the remfiles01.at and
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remfiles02.at test cases.
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* configure.ac: Define ENABLE_ERROR_PRINT_PROGNAME if using
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gnulib error().
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* src/tar.c [ENABLE_ERROR_PRINT_PROGNAME] (tar_print_progname): New function.
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(main) [ENABLE_ERROR_PRINT_PROGNAME]: Set error_print_progname.
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---
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configure.ac | 12 ++++++++++++
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src/tar.c | 27 +++++++++++++++++++++++++--
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2 files changed, 37 insertions(+), 2 deletions(-)
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diff --git a/configure.ac b/configure.ac
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index 66ed8ca..8e4207b 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -102,6 +102,18 @@ gt_TYPE_SSIZE_T
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# gnulib modules
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gl_INIT
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+
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+if test $ac_cv_lib_error_at_line = no; then
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+ # This means that the error() function is not present in libc, so
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+ # the one from gnulib will be used instead. This function precedes
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+ # error messages it prints with the program name as returned by getprogname()
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+ # call, instead of using the name set by set_program_name.
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+ # Install workaround.
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+ AC_DEFINE([ENABLE_ERROR_PRINT_PROGNAME],[1],
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+ [Enable the use of error_print_progname to print program name with error messages.
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+ See comment to function tar_print_progname in src/tar.c])
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+fi
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+
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# paxutils modules
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tar_PAXUTILS
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diff --git a/src/tar.c b/src/tar.c
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index 9c939f3..721d777 100644
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--- a/src/tar.c
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+++ b/src/tar.c
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@@ -2666,7 +2666,28 @@ decode_options (int argc, char **argv)
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report_textual_dates (&args);
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}
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-
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+
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+#ifdef ENABLE_ERROR_PRINT_PROGNAME
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+/* The error() function from glibc correctly prefixes each message it
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+ prints with program_name as set by set_program_name. However, its
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+ replacement from gnulib, which is linked in on systems where this
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+ function is not available, prints the name returned by getprogname()
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+ instead. Due to this messages output by tar subprocess (which sets its
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+ program name to 'tar (child)') become indiscernible from those printed
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+ by the main process. In particular, this breaks the remfiles01.at and
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+ remfiles02.at test cases.
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+
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+ To avoid this, on such systems the following helper function is used
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+ to print proper program name. Its address is assigned to the
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+ error_print_progname variable, which error() then uses instead of
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+ printing getprogname() result.
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+ */
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+static void
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+tar_print_progname (void)
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+{
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+ fprintf (stderr, "%s: ", program_name);
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+}
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+#endif
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/* Tar proper. */
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@@ -2676,7 +2697,9 @@ main (int argc, char **argv)
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{
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set_start_time ();
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set_program_name (argv[0]);
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-
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+#ifdef ENABLE_ERROR_PRINT_PROGNAME
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+ error_print_progname = tar_print_progname;
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+#endif
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setlocale (LC_ALL, "");
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bindtextdomain (PACKAGE, LOCALEDIR);
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textdomain (PACKAGE);
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--
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2.19.1
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