From 90853439a162d7c5389f6a68028b4390c349c04d Mon Sep 17 00:00:00 2001
From: Rui Salvaterra <rsalvaterra@gmail.com>
Date: Fri, 14 Aug 2020 13:21:22 +0100
Subject: [PATCH] zram-swap: explicitly use mkswap/swapon/swapoff from /sbin

The required BusyBox applets are enabled by default, so we can rely on them
being present in the system. This way, we make sure there are no conflicts
with less featured variants of these same applets which might also be
present in the system.

Fixes: 0bd7dfa3ed60 ("zram-swap: enable swap discard")

Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
[wrap commit description]
Signed-off-by: David Bauer <mail@david-bauer.net>
---
 package/system/zram-swap/Makefile        |  4 ++--
 package/system/zram-swap/files/zram.init | 18 +++++++++---------
 2 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/package/system/zram-swap/Makefile b/package/system/zram-swap/Makefile
index 5c132c9062..9a18dd3417 100644
--- a/package/system/zram-swap/Makefile
+++ b/package/system/zram-swap/Makefile
@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=zram-swap
-PKG_RELEASE:=6
+PKG_RELEASE:=7
 
 PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
 
@@ -17,7 +17,7 @@ include $(INCLUDE_DIR)/package.mk
 define Package/zram-swap
   SECTION:=utils
   CATEGORY:=Base system
-  DEPENDS:=+kmod-zram +!(BUSYBOX_CONFIG_MKSWAP&&BUSYBOX_CONFIG_SWAPON&&BUSYBOX_CONFIG_SWAPOFF):swap-utils
+  DEPENDS:=+kmod-zram +@BUSYBOX_CONFIG_MKSWAP +@BUSYBOX_CONFIG_SWAPON +@BUSYBOX_CONFIG_FEATURE_SWAPON_DISCARD +@BUSYBOX_CONFIG_FEATURE_SWAPON_PRI +@BUSYBOX_CONFIG_SWAPOFF
   TITLE:=ZRAM swap scripts
   PKGARCH:=all
 endef
diff --git a/package/system/zram-swap/files/zram.init b/package/system/zram-swap/files/zram.init
index bfb9285600..a42f019d92 100755
--- a/package/system/zram-swap/files/zram.init
+++ b/package/system/zram-swap/files/zram.init
@@ -35,18 +35,18 @@ zram_applicable()
 		return 1
 	}
 
-	command -v mkswap >/dev/null || {
-		logger -s -t zram_applicable -p daemon.err "[ERROR] 'mkswap' not installed"
+	[ -x /sbin/mkswap ] || {
+		logger -s -t zram_applicable -p daemon.err "[ERROR] 'BusyBox mkswap' not installed"
 		return 1
 	}
 
-	command -v swapon >/dev/null || {
-		logger -s -t zram_applicable -p daemon.err "[ERROR] 'swapon' not installed"
+	[ -x /sbin/swapon ] || {
+		logger -s -t zram_applicable -p daemon.err "[ERROR] 'BusyBox swapon' not installed"
 		return 1
 	}
 
-	command -v swapoff >/dev/null || {
-		logger -s -t zram_applicable -p daemon.err "[ERROR] 'swapoff' not installed"
+	[ -x /sbin/swapoff ] || {
+		logger -s -t zram_applicable -p daemon.err "[ERROR] 'BusyBox swapoff' not installed"
 		return 1
 	}
 }
@@ -182,8 +182,8 @@ start()
 	zram_comp_algo "$zram_dev"
 	zram_comp_streams "$zram_dev"
 	echo $(( $zram_size * 1024 * 1024 )) >"/sys/block/$( basename "$zram_dev" )/disksize"
-	mkswap "$zram_dev"
-	swapon -d $zram_priority "$zram_dev"
+	/sbin/mkswap "$zram_dev"
+	/sbin/swapon -d $zram_priority "$zram_dev"
 }
 
 stop()
@@ -192,7 +192,7 @@ stop()
 
 	for zram_dev in $( grep zram /proc/swaps |awk '{print $1}' ); do {
 		logger -s -t zram_stop -p daemon.debug "deactivate swap $zram_dev"
-		swapoff "$zram_dev" && zram_reset "$zram_dev" "claiming memory back"
+		/sbin/swapoff "$zram_dev" && zram_reset "$zram_dev" "claiming memory back"
 		local dev_index="$( echo $zram_dev | grep -o "[0-9]*$" )"
 		if [ $dev_index -ne 0 ]; then
 			logger -s -t zram_stop -p daemon.debug "removing zram $zram_dev"