Reacting on xorriso ifailure in pipe test of releng/auto_isocontent

releng/README

@@ -139,8 +139,12 @@ All general options are accepted.
   Exercises inclusion of xorriso/xorriso.h and libisoburn/libisoburn.h
   in C++ programs and linking of the libraries. It might be necessary
   to set compiler options by shell variable CFLAGS before running the test.
+  It might be necessary to hand over the install directory of libburn and
+  libisofs in shell variable LD_LIBRARY_PATH.
   E.g. if on FreeBSD the include headers libisofs.h , libburn.h are not found:
     export CFLAGS="-I/usr/local/include"
+  E.g. on GNU/Hurd, where libburn and libisofs are not found by the linker:
+    export LD_LIBRARY_PATH="/usr/local/lib"
 
 ./auto_isocontent -x ../xorriso/xorriso
   Tests whether xorriso is able to record and restore two familes of

releng/auto_isocontent

@@ -94,6 +94,20 @@ is_valid_iso9660() {
  fi
 }
 
+# Retrieve and evaluate return value of command run under return_wrapper
+check_xorriso_return() {
+ ret=$(cat "$return_value_file")
+ rm "$return_value_file"
+ if test "$ret" = 0
+ then
+   return 0
+ fi
+ failure=1
+ echo
+ echo "FAIL : ${SELF} : xorriso run exited with value $ret"
+ return 1
+}
+
 # Create test file and find out whether ACLs and/or xattr are available.
 #
 # Users known on GNU/Linux and FreeBSD: root games daemon man
@@ -200,12 +214,17 @@ ls -l "$on_disk"/*
 echo -e "\n${SELF}: Producing simple image via -o" >&2
 "$xorriso" -as mkisofs "$on_disk" -o "$workdir"/image_minus_o.iso
 is_valid_iso9660                          "$workdir"/image_minus_o.iso
+
 echo -e "\n${SELF}: Producing simple image via redirect" >&2
 "$xorriso" -as mkisofs "$on_disk" >       "$workdir"/image_redirected.iso
 is_valid_iso9660                          "$workdir"/image_redirected.iso
+
 echo -e "\n${SELF}: Producing simple image via pipe" >&2
-"$xorriso" -as mkisofs "$on_disk" | cat > "$workdir"/image_piped.iso
+return_wrapper "$xorriso" -as mkisofs "$on_disk" | \
+               cat > "$workdir"/image_piped.iso
+check_xorriso_return
 is_valid_iso9660                          "$workdir"/image_piped.iso
+
 echo -e "\n${SELF}: Producing simple image with for_backup/update_r/hardlinks" >&2
 "$xorriso" \
   $report_about \

releng/inc/releng_getopts.inc

@@ -119,6 +119,20 @@ check_for_xorriso() {
 }
 
 
+#############################################
+
+# To catch the exit value of a command in a pipe
+return_value_file="$GEN_DATA_DIR"/wrapper_"$$"_return_value
+return_wrapper()
+{
+ cmd="$1"
+ shift 1
+ "$cmd" "$@"
+ RET="$?"
+ echo "$RET" >"$return_value_file"
+ return "$RET"
+}
+
 #############################################
 
 next_is=