X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~cjwatson/git?p=bin.git;a=blobdiff_plain;f=get-kernel;h=a936122dfc6b4efbbd7ff67118e7786759f55432;hp=c4d9b92f92e975180e29df4eb41e950587414d7e;hb=34b8037c044aea04cf2219c93b3cb3c1c5818c76;hpb=048aac6382a1cd35c048734907a51e3be5727e42

diff --git a/get-kernel b/get-kernel
index c4d9b92..a936122 100755
--- a/get-kernel
+++ b/get-kernel
@@ -1,11 +1,15 @@
 #! /bin/sh -e
 
-VERSION=$1
-MAJOR=`expr $1 : '\(^[0-9]*\.[0-9]*\)'`
+if [ -z "$1" ]; then
+    echo >&2 "No version specified, stopping."
+    exit 1
+fi
+
+VERSION="$1"
+MAJOR="${1%.*}"
 
 rm -f linux
-wget -c ftp://ftp.kernel.org/pub/linux/kernel/v$MAJOR/linux-$VERSION.tar.bz2
-tar xjvf linux-$VERSION.tar.bz2
-rm -f linux-$VERSION.tar.bz2
-mv linux linux-$VERSION
-ln -s linux-$VERSION linux
+wget -c "ftp://ftp.kernel.org/pub/linux/kernel/v$MAJOR/linux-$VERSION.tar.bz2"
+tar xjvf "linux-$VERSION.tar.bz2"
+if [ -h linux ]; then mv linux "linux-$VERSION"; fi
+ln -s "linux-$VERSION" linux