diff --git a/bbootimg/src/main/kotlin/ota/Payload.kt b/bbootimg/src/main/kotlin/ota/Payload.kt
index 87089e9..0301b34 100644
--- a/bbootimg/src/main/kotlin/ota/Payload.kt
+++ b/bbootimg/src/main/kotlin/ota/Payload.kt
@@ -18,6 +18,7 @@ import cc.cfig.io.Struct
 import cfig.helper.CryptoHelper.Hasher
 import cfig.helper.Dumpling
 import cfig.helper.Helper
+import cfig.utils.EnvironmentVerifier
 import chromeos_update_engine.UpdateMetadata
 import com.fasterxml.jackson.annotation.JsonInclude
 import com.fasterxml.jackson.databind.ObjectMapper
@@ -45,6 +46,7 @@ class Payload {
     companion object {
         private val log = LoggerFactory.getLogger(Payload::class.java)
         val workDir = Helper.prop("payloadDir")
+        val envv = EnvironmentVerifier()
 
         fun parse(inFileName: String): Payload {
             val ret = Payload()
@@ -172,6 +174,8 @@ class Payload {
     }
 
     private fun decompress(inBytes: ByteArray, opType: UpdateMetadata.InstallOperation.Type): ByteArray {
+        check(envv.hasXzcat) { "xzcat not found" }
+        check(envv.hasBzcat) { "bzcat not found" }
         val baosO = ByteArrayOutputStream()
         val baosE = ByteArrayOutputStream()
         val bais = ByteArrayInputStream(inBytes)
diff --git a/bbootimg/src/main/kotlin/utils/EnvironmentVerifier.kt b/bbootimg/src/main/kotlin/utils/EnvironmentVerifier.kt
index cd203ed..53815f6 100644
--- a/bbootimg/src/main/kotlin/utils/EnvironmentVerifier.kt
+++ b/bbootimg/src/main/kotlin/utils/EnvironmentVerifier.kt
@@ -54,6 +54,34 @@ class EnvironmentVerifier {
             return true
         }
 
+    val hasXzcat: Boolean
+        get(): Boolean {
+            var ret = false
+            try {
+                val process = Runtime.getRuntime().exec(arrayOf("xzcat", "-V"), null, null)
+                log.debug("xzcat available")
+                val exitCode = process.waitFor()
+                ret = (exitCode == 0 && process.exitValue() == 0)
+            } catch (e: Exception) {
+                log.warn("xzcat unavailable")
+            }
+            return ret
+        }
+
+    val hasBzcat: Boolean
+        get(): Boolean {
+            var ret = false
+            try {
+                val process = Runtime.getRuntime().exec(arrayOf("bzcat", "-V"), null, null)
+                log.debug("bzcat available")
+                val exitCode = process.waitFor()
+                ret = (exitCode == 0 && process.exitValue() == 0)
+            } catch (e: Exception) {
+                log.warn("bzcat unavailable")
+            }
+            return ret
+        }
+
     val has7z: Boolean
         get(): Boolean {
             try {
diff --git a/bbootimg/src/test/kotlin/EnvironmentVerifierTest.kt b/bbootimg/src/test/kotlin/EnvironmentVerifierTest.kt
index cd70233..e0146ee 100644
--- a/bbootimg/src/test/kotlin/EnvironmentVerifierTest.kt
+++ b/bbootimg/src/test/kotlin/EnvironmentVerifierTest.kt
@@ -14,26 +14,40 @@
 
 import cfig.utils.EnvironmentVerifier
 import org.junit.Test
+import org.slf4j.LoggerFactory
 
 class EnvironmentVerifierTest {
     private val envv = EnvironmentVerifier()
+    private val log = LoggerFactory.getLogger(EnvironmentVerifier::class.java)
 
     @Test
     fun getHasDtc() {
         val hasDtc = envv.hasDtc
-        println("hasDtc = $hasDtc")
+        log.info("hasDtc = $hasDtc")
 
     }
 
     @Test
     fun getHasXz() {
         val hasXz = envv.hasXz
-        println("hasXz = $hasXz")
+        log.info("hasXz = $hasXz")
     }
 
     @Test
     fun getGzip() {
         val h = envv.hasGzip
-        println("hasGzip = $h")
+        log.info("hasGzip = $h")
+    }
+
+    @Test
+    fun getXzcat() {
+        val h = envv.hasXzcat
+        log.info("hasXzcat = $h")
+    }
+
+    @Test
+    fun getBzcat() {
+        val h = envv.hasBzcat
+        log.info("hasBzcat = $h")
     }
 }
diff --git a/tools/release.mk b/tools/release.mk
index 00d49e2..719e6ef 100644
--- a/tools/release.mk
+++ b/tools/release.mk
@@ -1,9 +1,9 @@
 #
 # release.mk
-# yu, 2020-12-20 00:19
+# yuyezhong@gmail.com, 2020-12-20 00:19
 #
 define gw
-#!/usr/bin/env sh\n
+#!/usr/bin/bash\n
 if [ "x$$1" = "xassemble" ]; then\n
     echo "already assembled"\n
     exit\n
@@ -16,7 +16,13 @@ if [ "x$$1" = "xclean" ]; then\n
 echo "no cleaning is needed"\n
 exit 0\n
 fi\n
-java -jar bbootimg/bbootimg.jar $$*
+if [[ "$$2" == "-Dpart="* ]]; then\n
+  set -x\n
+  java $$2 -jar bbootimg/bbootimg.jar $$1\n
+else\n
+  set -x\n
+  java -jar bbootimg/bbootimg.jar $$*\n
+fi
 
 endef