Use source date epoch during builds

src/freedombone-image-customise

@@ -667,6 +667,11 @@ install_babel() {
 cd /etc/babel
 git checkout $BABEL_COMMIT -b $BABEL_COMMIT
 cd /etc/babel
+
+DATE_FMT=%Y-%m-%d
+SOURCE_DATE_EPOCH=2018-12-07
+BUILD_DATE=\$(date -u -d \"\${SOURCE_DATE_EPOCH}\" \"+\${DATE_FMT}\"  2>/dev/null || date -u -r \"\${SOURCE_DATE_EPOCH}\" \"+\${DATE_FMT}\" 2>/dev/null || date -u \"+\${DATE_FMT}\")
+
 make
 make install
 EOF
@@ -706,6 +711,11 @@ install_olsr2() {
 cd /etc/olsr2
 git checkout $OLSR2_COMMIT -b $OLSR2_COMMIT
 cd /etc/olsr2/build
+
+DATE_FMT=%Y-%m-%d
+SOURCE_DATE_EPOCH=2018-12-07
+BUILD_DATE=\$(date -u -d \"\${SOURCE_DATE_EPOCH}\" \"+\${DATE_FMT}\"  2>/dev/null || date -u -r \"\${SOURCE_DATE_EPOCH}\" \"+\${DATE_FMT}\" 2>/dev/null || date -u \"+\${DATE_FMT}\")
+
 cmake ..
 make
 make install
@@ -742,6 +752,11 @@ install_bmx6() {
 #!/bin/bash
 cd /etc/bmx6
 git checkout $BMX6_COMMIT -b $BMX6_COMMIT
+
+DATE_FMT=%Y-%m-%d
+SOURCE_DATE_EPOCH=2018-12-07
+BUILD_DATE=\$(date -u -d \"\${SOURCE_DATE_EPOCH}\" \"+\${DATE_FMT}\"  2>/dev/null || date -u -r \"\${SOURCE_DATE_EPOCH}\" \"+\${DATE_FMT}\" 2>/dev/null || date -u \"+\${DATE_FMT}\")
+
 make
 make install
 
@@ -812,6 +827,11 @@ cd /etc
 wget https://tls.mbed.org/download/mbedtls-${MBEDTLS_VERSION}-gpl.tgz
 tar xzvf mbedtls-${MBEDTLS_VERSION}-gpl.tgz
 cd mbedtls-${MBEDTLS_VERSION}
+
+DATE_FMT=%Y-%m-%d
+SOURCE_DATE_EPOCH=2018-12-07
+BUILD_DATE=\$(date -u -d \"\${SOURCE_DATE_EPOCH}\" \"+\${DATE_FMT}\"  2>/dev/null || date -u -r \"\${SOURCE_DATE_EPOCH}\" \"+\${DATE_FMT}\" 2>/dev/null || date -u \"+\${DATE_FMT}\")
+
 if ! make; then
     exit 1
 fi
@@ -1658,6 +1678,11 @@ image_install_inadyn() {
     cd "$rootdir/root/build/inadyn" || exit 24682464628
     { echo '#!/bin/bash';
       echo 'cd ~/build/inadyn';
+      echo '';
+      echo 'DATE_FMT=%Y-%m-%d';
+      echo 'SOURCE_DATE_EPOCH=2018-12-07';
+      echo "BUILD_DATE=\$(date -u -d \"\${SOURCE_DATE_EPOCH}\" \"+\${DATE_FMT}\"  2>/dev/null || date -u -r \"\${SOURCE_DATE_EPOCH}\" \"+\${DATE_FMT}\" 2>/dev/null || date -u \"+\${DATE_FMT}\")";
+      echo '';
       echo './autogen.sh';
       echo './configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var';
       echo 'make -j5';