[dpkg] 16/192: build: Detect the required GNU tar

[Ximin Luo]

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infinity0 pushed a commit to branch pu/reproducible_builds
in repository dpkg.

commit 068980536d9bf613cc0e0b6d17b49cc3e3b37313
Author: Guillem Jover <guillem at debian.org>
Date:   Tue Mar 28 22:44:36 2017 +0200

    build: Detect the required GNU tar
    
    For now we do require a GNU tar implementation, so let's check this
    explicitly in configure, so that downstream packagers do not get
    surprised when the code fails at run-time.
    
    In the future this should be lifted once we switch fully to an internal
    tar implementation.
---
 debian/changelog | 1 +
 m4/dpkg-progs.m4 | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/debian/changelog b/debian/changelog
index 864441c..c6b663f 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -15,6 +15,7 @@ dpkg (1.18.24) UNRELEASED; urgency=medium
   * Build system:
     - Use libexec variable for auxiliary internal programs, and set it to
       /usr/lib on Debian and derivatives.
+    - Check that the detected tar is a GNU tar.
 
   [ Updated programs translations ]
   * Catalan (Guillem Jover).
diff --git a/m4/dpkg-progs.m4 b/m4/dpkg-progs.m4
index d9c4b21..96c074e 100644
--- a/m4/dpkg-progs.m4
+++ b/m4/dpkg-progs.m4
@@ -59,5 +59,8 @@ AC_DEFUN([DPKG_PROG_POD2MAN], [
 AC_DEFUN([DPKG_DEB_PROG_TAR], [
   AC_ARG_VAR([TAR], [GNU tar program])
   AC_CHECK_PROGS([TAR], [gnutar gtar tar], [tar])
+  AS_IF([! $TAR --version 2>/dev/null | grep -q '^tar (GNU tar)'], [
+    AC_MSG_ERROR([cannot find a GNU tar program])
+  ])
   AC_DEFINE_UNQUOTED([TAR], ["$TAR"], [GNU tar program])
 ])# DPKG_DEB_PROG_TAR

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