+ if [ "$imagename" != "${prefix}-image-${kervers}" ]; then
+ if dpkg --compare-versions 1."$imagename" lt 1."${prefix}-image-${kervers}"; then
+ return 2
+ fi
+ echo "$imagename" != "${prefix}-image-${kervers}"
+ return 1
+ fi
+
+ local availvrs=$(apt-cache policy ${imagename} 2>/dev/null | grep '^ Candidate' | awk '{print $2}')
+ local kernelversion=$(apt-cache policy ${prefix}-image-${kervers} 2>/dev/null | grep '^ Installed:' | awk '{print $2}')
+
+ if [ "$availvrs" = "$kernelversion" ]; then
+ return 0
+ fi
+
+ echo "$kernelversion != $availvrs"
+ return 1
+}
+
+cat_vmlinux() {
+ local image header filter hdroff
+
+ image="$1"
+ header="$2"
+ filter="$3"
+ hdroff="$4"
+
+ get_offset "$image" $header | head -n 5 | while read off; do
+ (if [ "$off" != 0 ]; then
+ dd ibs="$((off+hdroff))" skip=1 count=0
+ fi &&
+ dd bs=512k) < "$image" 2>/dev/null | $filter 2>/dev/null
+ done
+}
+
+get_image_linux() {
+ local image
+
+ image="$1"
+
+ # gzip compressed image
+ cat_vmlinux "$image" "\x1f\x8b\x08\x00" "zcat" 0
+ cat_vmlinux "$image" "\x1f\x8b\x08\x08" "zcat" 0
+ # lzma compressed image
+ cat_vmlinux "$image" "\x00\x00\x00\x02\xff" "xzcat" -1
+ cat_vmlinux "$image" "\x00\x00\x00\x04\xff" "xzcat" -1
+ # xz compressed image
+ cat_vmlinux "$image" "\xfd\x37\x7a\x58\x5a " "xzcat" 0
+