linux-kernel - [PATCH v4 01/79] headers_install.sh: enhance error handling

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Date:	Thu, 15 Oct 2015 07:55:39 +0200
From:	Mikko Rapeli <mikko.rapeli@....fi>
To:	linux-kernel@...r.kernel.org
Cc:	mikko.rapeli@....fi
Subject: [PATCH v4 01/79] headers_install.sh: enhance error handling

Exit with error if using undefined variables or if any sub command fails
with error return value. unidef needs special handling since but this can
be done without the trap. Enables exaniming intermediate files if some
commands failed.

Signed-off-by: Mikko Rapeli <mikko.rapeli@....fi>
---
 scripts/headers_install.sh | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/scripts/headers_install.sh b/scripts/headers_install.sh
index fdebd66..fe22807 100755
--- a/scripts/headers_install.sh
+++ b/scripts/headers_install.sh
@@ -1,4 +1,6 @@
 #!/bin/sh
+set -e
+set -u
 
 if [ $# -lt 2 ]
 then
@@ -26,7 +28,6 @@ shift
 # Iterate through files listed on command line
 
 FILE=
-trap 'rm -f "$OUTDIR/$FILE" "$OUTDIR/$FILE.sed"' EXIT
 for i in "$@"
 do
 	FILE="$(basename "$i")"
@@ -37,10 +38,13 @@ do
 		-e 's/(^|[^a-zA-Z0-9])__packed([^a-zA-Z0-9_]|$)/\1__attribute__((packed))\2/g' \
 		-e 's/(^|[ \t(])(inline|asm|volatile)([ \t(]|$)/\1__\2__\3/g' \
 		-e 's@#(ifndef|define|endif[ \t]*/[*])[ \t]*_UAPI@#\1 @' \
-		"$SRCDIR/$i" > "$OUTDIR/$FILE.sed" || exit 1
+		"$SRCDIR/$i" > "$OUTDIR/$FILE.sed" || \
+		( rm -f "$OUTDIR/$FILE.sed" ; exit 1 )
 	scripts/unifdef -U__KERNEL__ -D__EXPORTED_HEADERS__ "$OUTDIR/$FILE.sed" \
-		> "$OUTDIR/$FILE"
-	[ $? -gt 1 ] && exit 1
+		> "$OUTDIR/$FILE" || \
+		( if [ $? -gt 1 ]; then \
+				rm -f "$OUTDIR/$FILE" "$OUTDIR/$FILE.sed" ; \
+				exit 1 ; \
+		  fi )
 	rm -f "$OUTDIR/$FILE.sed"
 done
-trap - EXIT
-- 
2.5.0

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