[Reproducible-commits] [misc] 02/02: prebuilder: do a precheck with cmp to skip huge diffoscope installation if it's reproducible

[Reiner Herrmann]

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deki-guest pushed a commit to branch master
in repository misc.

commit 2272c00e889dd6ac46b1dbfc57af67f2e864ef0f
Author: Reiner Herrmann <reiner at reiner-h.de>
Date:   Sat Jan 9 14:03:42 2016 +0100

    prebuilder: do a precheck with cmp to skip huge diffoscope installation if it's reproducible
---
 prebuilder/pbuilderhooks/B92_diffoscope | 41 ++++++++++++++++++++++++++-------
 1 file changed, 33 insertions(+), 8 deletions(-)

diff --git a/prebuilder/pbuilderhooks/B92_diffoscope b/prebuilder/pbuilderhooks/B92_diffoscope
index 62ec04f..dd44145 100755
--- a/prebuilder/pbuilderhooks/B92_diffoscope
+++ b/prebuilder/pbuilderhooks/B92_diffoscope
@@ -5,6 +5,17 @@
 # of diffoscope that matches our build environment; and get the latest
 # improvements if it's unstable.
 
+print_reproducible() {
+	echo
+	echo "                              _            _ _     _      "
+	echo " _ __ ___ _ __  _ __ ___   __| |_   _  ___(_) |__ | | ___ "
+	echo "| '__/ _ \ '_ \| '__/ _ \ / _\` | | | |/ __| | '_ \| |/ _ \\"
+	echo "| | |  __/ |_) | | | (_) | (_| | |_| | (__| | |_) | |  __/"
+	echo "|_|  \___| .__/|_|  \___/ \__,_|\__,_|\___|_|_.__/|_|\___|"
+	echo "         |_|                                              "
+	echo
+}
+
 [ -f /tmp/buildd/initial_build.tar ] || exit 0
 
 echo "I: unpacking initial build material"
@@ -12,18 +23,32 @@ mkdir -p /tmp/initial_build
 tar -C /tmp/initial_build -xf /tmp/buildd/initial_build.tar
 rm /tmp/buildd/initial_build.tar
 
+
+echo "I: comparing build artefacts with cmp"
+[ -x /usr/bin/dcmd ] || apt-get install -y --no-install-recommends devscripts 2>&1 > /dev/null
+FILES1=$(dcmd find /tmp/initial_build/*.changes -exec basename '{}' \; | LC_ALL=C sort)
+FILES2=$(dcmd find /tmp/buildd/*.changes -exec basename '{}' \; | LC_ALL=C sort)
+if [ "$FILES1" = "$FILES2" ]; then
+	DIFF=0
+	for file in $FILES1;
+	do
+		cmp -s "/tmp/initial_build/$file" "/tmp/buildd/$file"
+		DIFF=$?
+		[ $DIFF -gt 0 ] && break
+	done
+	if [ $DIFF -eq 0 ]; then
+		print_reproducible
+		echo "D: skipping installing and running diffoscope as package is reproducible"
+		exit 0
+	fi
+fi
+
+
 echo "I: installing diffoscope and running it on the package"
 apt-get install -y --install-recommends sudo diffoscope 2>&1 > /dev/null
 touch /tmp/buildd/diffoscope.{txt,html}
 chown nobody /tmp/buildd/diffoscope.{txt,html}
 if sudo -u nobody diffoscope --text /tmp/buildd/diffoscope.txt --html /tmp/buildd/diffoscope.html /tmp/initial_build/*.changes /tmp/buildd/*.changes; then
-	echo
-	echo "                              _            _ _     _      "
-	echo " _ __ ___ _ __  _ __ ___   __| |_   _  ___(_) |__ | | ___ "
-	echo "| '__/ _ \ '_ \| '__/ _ \ / _\` | | | |/ __| | '_ \| |/ _ \\"
-	echo "| | |  __/ |_) | | | (_) | (_| | |_| | (__| | |_) | |  __/"
-	echo "|_|  \___| .__/|_|  \___/ \__,_|\__,_|\___|_|_.__/|_|\___|"
-	echo "         |_|                                              "
-	echo
+	print_reproducible
 	rm -f /tmp/buildd/diffoscope.{txt,html}
 fi

-- 
Alioth's /usr/local/bin/git-commit-notice on /srv/git.debian.org/git/reproducible/misc.git