src/common: Add find loop debug logging

src/common.bash

@@ -293,7 +293,7 @@ function AconfCompileSystem() {
 	# Progress display - only show file names once per second
 	local progress_fd
 	exec {progress_fd}> \
-		 >( gawk '
+		 >( ( gawk '
 BEGIN {
     RS = "\0";
     t = systime();
@@ -305,7 +305,7 @@ BEGIN {
         printf "%s\0", $0;
         system(""); # https://unix.stackexchange.com/a/83853/4830
 	}
-}' | \
+}' || FatalError 'gawk failed!\n' ) | \
 				while read -r -d $'\0' line
 				do
 					local path=${line:1}
@@ -323,6 +323,7 @@ BEGIN {
 		# NB: Regular expressions can be generated by AconfCreateFindIgnoreArgs
 		#     The posix-extended regex type is used since it's easier to work
 		#     with (e.g. no need to escape '|' alternations, parenthesis, etc.)
+		(
 		sudo find /									\
 			 -regextype posix-extended				\
 			 -not									\
@@ -332,9 +333,11 @@ BEGIN {
 				\)									\
 				-printf 'I' -print0 -prune			\
 			\)										\
-			-printf 'O' -print0						\
-			| tee /dev/fd/$progress_fd				\
-			| ( grep								\
+			-printf 'O' -print0 || FatalError 'find failed!\n'
+		)											\
+			| (
+				tee /dev/fd/$progress_fd || FatalError 'tee failed!\n'
+			) | ( grep								\
 					--null --null-data				\
 					--invert-match					\
 					--fixed-strings					\