Integrate contributed fix for reproducible build

debian/changelog

@@ -5,6 +5,16 @@ backupninja (UNRELEASED) unstable; urgency=medium
 
  -- Micah Anderson <micah@riseup.net>  Sat, 02 Jan 2021 15:49:50 -0400
 
+backupninja (1.1.0-2.1) unstable; urgency=medium
+
+  * Non-maintainer upload.
+  * Add debian/patches/unbreak-AC_PATH_PROG-bash.patch
+  * Pass BASH,SED,MKTEMP to configure specifying correct paths
+    - fixes reproducible build on merged-usr vs non-merged system
+      (Closes: #915222)
+
+ -- Andreas Henriksson <andreas@fatal.se>  Sat, 01 Dec 2018 21:39:53 +0100
+
 backupninja (1.1.0-2) unstable; urgency=medium
 
   * Fix FTBFS (Closes: #903168)

debian/patches/series

+unbreak-AC_PATH_PROG-bash.patch

debian/patches/unbreak-AC_PATH_PROG-bash.patch

+From: Andreas Henriksson <andreas@fatal.se>
+Subject: unbreak AC_PATH_PROG bash
+
+Being able to set the variable name in the environment before
+running configure is a documented feature of AC_PATH_PROG.
+Explicitly unsetting the variable ofcourse breaks that feature.
+
+If someone thinks BASH is not a good variable name because it
+might be used for something else already, then either sanitize
+your build environment or use a different variable name!
+
+The hypothetical case in the comment isn't relevant in our build
+environment, so unbreak things here by commenting out the unset....
+
+--- backupninja-1.1.0.orig/configure.ac
++++ backupninja-1.1.0/configure.ac
+@@ -11,7 +11,7 @@ AM_INIT_AUTOMAKE([foreign])
+
+ # BASH may already be set in the shell, if the admin then changes the
+ # the /bin/sh symlink to a non-bash shell, all hell will break lose.
+-unset BASH
++#unset BASH
+ AC_PATH_PROGS(BASH, bash, "no", [$PATH:/bin:/usr/bin:/usr/sbin])
+ if test x$BASH = "xno"; then
+     AC_MSG_ERROR([bash is required])

debian/rules

@@ -9,6 +9,8 @@ TMP = $(CURDIR)/debian/$(PACKAGE)
 
 override_dh_auto_configure:
 	dh_auto_configure -- \
+	   MKTEMP=/bin/mktemp BASH=/bin/bash SED=/bin/sed \
+	   AWK=/usr/bin/awk STAT=/usr/bin/stat \
 	   --libdir=\$${prefix}/lib \
 	   --libexecdir=\$${prefix}/lib