scripts: fix wrong usage of '==' operator

[base-files] shell-scripting: fix wrong usage of '==' operator

normally the '==' is used for invoking a regex parser and is a bashism.
all of the fixes just want to compare a string. the used busybox-ash
will silently "ignore" this mistake, but make it portable/clean at least.

this patch does not change the behavior/logic of the scripts.

Signed-off-by: Bastian Bittorf <bittorf@bluebottle.com>

SVN-Revision: 42911

package/system/fstools/files/snapshot

@@ -38,16 +38,16 @@ do_config_push() {
 
 do_snapshot_upgrade() {
 	opkg update
-	[ $? == 0 ] || exit 1
+	[ $? -eq 0 ] || exit 1
 
 	opkg list-upgradable
-	[ $? == 0 ] || exit 2
+	[ $? -eq 0 ] || exit 2
 	
 	UPDATES=`opkg list-upgradable | cut -d" " -f1`
 	[ -z "${UPDATES}" ] && exit 0
 
 	opkg upgrade ${UPDATES}
-	[ $? == 0 ] || exit 3
+	[ $? -eq 0 ] || exit 3
 
 	do_snapshot_push
 	sleep 5

package/system/procd/files/nand.sh

@@ -274,8 +274,8 @@ nand_do_upgrade_stage2() {
 
 	[ ! "$(find_mtd_index "$CI_UBIPART")" ] && CI_UBIPART="rootfs"
 
-	[ "$file_type" == "ubi" ] && nand_upgrade_ubinized $1
-	[ "$file_type" == "ubifs" ] && nand_upgrade_ubifs $1
+	[ "$file_type" = "ubi" ] && nand_upgrade_ubinized $1
+	[ "$file_type" = "ubifs" ] && nand_upgrade_ubifs $1
 	nand_upgrade_tar $1
 }
 

package/system/procd/files/procd.sh

@@ -93,7 +93,7 @@ _procd_add_table_data() {
 	while [ -n "$1" ]; do
 		local var="${1%%=*}"
 		local val="${1#*=}"
-		[[ "$1" == "$val" ]] && val=
+		[ "$1" = "$val" ] && val=
 		json_add_string "$var" "$val"
 		shift
 	done