Capture piped exit codes in scripts and use those for exit codes.

Fixes kdave#128

Author: LordMike

btrfs-balance.sh

@@ -70,4 +70,6 @@ case "$BTRFS_LOG_OUTPUT" in
 	*) cat;;
 esac
 
-exit 0
+# Capture exit code from the piped command above and return it
+EXIT_STATUS=${PIPESTATUS[0]}
+exit $EXIT_STATUS

btrfs-defrag.sh

@@ -40,4 +40,6 @@ case "$BTRFS_LOG_OUTPUT" in
 	*) cat;;
 esac
 
-exit 0
+# Capture exit code from the piped command above and return it
+EXIT_STATUS=${PIPESTATUS[0]}
+exit $EXIT_STATUS

btrfs-scrub.sh

@@ -70,4 +70,6 @@ case "$BTRFS_LOG_OUTPUT" in
 	*) cat;;
 esac
 
-exit 0
+# Capture exit code from the piped command above and return it
+EXIT_STATUS=${PIPESTATUS[0]}
+exit $EXIT_STATUS

btrfs-trim.sh

@@ -41,4 +41,6 @@ case "$BTRFS_LOG_OUTPUT" in
 	*) cat;;
 esac
 
-exit 0
+# Capture exit code from the piped command above and return it
+EXIT_STATUS=${PIPESTATUS[0]}
+exit $EXIT_STATUS