linux-kernel - [PATCH 03/45] headers_install.sh: enhance error handling

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Message-Id: <1424127948-22484-4-git-send-email-mikko.rapeli@iki.fi>
Date:	Tue, 17 Feb 2015 00:05:06 +0100
From:	Mikko Rapeli <mikko.rapeli@....fi>
To:	linux-kernel@...r.kernel.org
Cc:	Mikko Rapeli <mikko.rapeli@....fi>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Marek <mmarek@...e.cz>,
	Javier Barrio <javier.barrio.mart@...il.com>
Subject: [PATCH 03/45] 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 | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/scripts/headers_install.sh b/scripts/headers_install.sh
index fdebd66..072f7d3 100755
--- a/scripts/headers_install.sh
+++ b/scripts/headers_install.sh
@@ -1,4 +1,7 @@
 #!/bin/sh
+set -e
+set -u
+#set -x
 
 if [ $# -lt 2 ]
 then
@@ -26,7 +29,6 @@ shift
 # Iterate through files listed on command line
 
 FILE=
-trap 'rm -f "$OUTDIR/$FILE" "$OUTDIR/$FILE.sed"' EXIT
 for i in "$@"
 do
 	FILE="$(basename "$i")"
@@ -37,10 +39,13 @@ do
 		-e 's/(^|[^a-zA-Z0-9])__packed([^a-zA-Z0-9_]|$)/\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
-- 
2.1.4

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