[Reproducible-commits] [dpkg] 57/61: Preset build timestamp to latest changelog entry

[Jérémy Bobbio]

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

commit 746a1ba5d86d198f1650214203648ad2ec1b18b9
Author: Jérémy Bobbio <lunar at debian.org>
Date:   Tue Aug 27 23:53:22 2013 +0200

    Preset build timestamp to latest changelog entry
    
    dpkg-buildpackage will set the DEB_BUILD_TIMESTAMP environment variable to the
    date of the latest entry in debian/changelog. This enables build to be easily
    reproduced as the dates captured in the `.deb` archives will be deterministic.
    
    DEB_BUILD_TIMESTAMP can also be externaly set before running dpkg-buildpackage.
    to reproduce the build with an arbitrary date.
    
    Closes: #759999
---
 dpkg-deb/build.c             | 20 +++++++++++++++++++-
 scripts/dpkg-buildpackage.pl |  5 +++++
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/dpkg-deb/build.c b/dpkg-deb/build.c
index c773df9..edcbf19 100644
--- a/dpkg-deb/build.c
+++ b/dpkg-deb/build.c
@@ -547,6 +547,24 @@ gen_dest_pathname_from_pkg(const char *dir, struct pkginfo *pkg)
   return path;
 }
 
+static time_t
+get_build_timestamp(void)
+{
+  time_t timestamp;
+  const char *value;
+  char *end;
+
+  errno = 0;
+  value = getenv("DEB_BUILD_TIMESTAMP");
+  if (!value)
+    return time(NULL);
+
+  timestamp = strtol(value, &end, 10);
+  if (value == end || *end || errno != 0)
+    ohshite(_("unable to parse timestamp `%.255s'"), value);
+  return timestamp;
+}
+
 /**
  * Overly complex function that builds a .deb file.
  */
@@ -591,7 +609,7 @@ do_build(const char *const *argv)
   }
   m_output(stdout, _("<standard output>"));
 
-  build_timestamp = time(NULL);
+  build_timestamp = get_build_timestamp();
 
   /* Now that we have verified everything its time to actually
    * build something. Let's start by making the ar-wrapper. */
diff --git a/scripts/dpkg-buildpackage.pl b/scripts/dpkg-buildpackage.pl
index 17ada97..c3118e8 100755
--- a/scripts/dpkg-buildpackage.pl
+++ b/scripts/dpkg-buildpackage.pl
@@ -439,6 +439,11 @@ if ($changedby) {
     $maintainer = mustsetvar($changelog->{maintainer}, g_('source changed by'));
 }
 
+if (!$ENV{DEB_BUILD_TIMESTAMP}) {
+    my $timestamp = `date -d'$changelog->{date}' +%s`;
+    chomp $timestamp;
+    $ENV{DEB_BUILD_TIMESTAMP} = $timestamp;
+}
 
 my @arch_opts;
 push @arch_opts, ('--host-arch', $host_arch) if $host_arch;

-- 
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