summaryrefslogtreecommitdiffstats
path: root/package/base-files/files/lib/upgrade
diff options
context:
space:
mode:
Diffstat (limited to 'package/base-files/files/lib/upgrade')
-rw-r--r--package/base-files/files/lib/upgrade/common.sh21
1 files changed, 14 insertions, 7 deletions
diff --git a/package/base-files/files/lib/upgrade/common.sh b/package/base-files/files/lib/upgrade/common.sh
index ef7ce57e7..018cc72f4 100644
--- a/package/base-files/files/lib/upgrade/common.sh
+++ b/package/base-files/files/lib/upgrade/common.sh
@@ -103,16 +103,23 @@ rootfs_type() {
mount | awk '($3 ~ /^\/$/) && ($5 !~ /rootfs/) { print $5 }'
}
-get_image() {
+get_image() { # <source> [ <command> ]
local from="$1"
- local conc="cat"
+ local cmd="$2"
+ local conc
- [ "$GZIPED" -eq 1 ] && conc="zcat"
+ if [ -z "$cmd" ]; then
+ case "$from" in
+ http://*|ftp://*) cmd="wget -O- -q";;
+ *) cmd="cat";;
+ esac
+ local magic="$(eval $cmd $from | dd bs=2 count=1 2>/dev/null | hexdump -n 2 -e '1/1 "%02x"')"
+ case "$magic" in
+ 1f8b) conc="| zcat";;
+ esac
+ fi
- case "$from" in
- http://*|ftp://*) wget -O- -q "$from" | "$conc";;
- *) cat "$from" | "$conc";;
- esac
+ eval "$cmd $from $conc"
}
get_magic_word() {