From c3344549a8fa0b3175ebf49364723df0b832d9bb Mon Sep 17 00:00:00 2001
From: "Aleksei.Cherepanov" <aleksei.cherepanov@jetbrains.com>
Date: Thu, 5 Aug 2021 15:11:22 +0300
Subject: [PATCH] Avoid overwriting counters file of Lookups storage if it
 hasn't changed

---
 .../kotlin/incremental/LookupStorage.kt          | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/build-common/src/org/jetbrains/kotlin/incremental/LookupStorage.kt b/build-common/src/org/jetbrains/kotlin/incremental/LookupStorage.kt
index b3bfb2f94e4..a3c4aceb497 100644
--- a/build-common/src/org/jetbrains/kotlin/incremental/LookupStorage.kt
+++ b/build-common/src/org/jetbrains/kotlin/incremental/LookupStorage.kt
@@ -48,12 +48,14 @@ open class LookupStorage(
 
     @Volatile
     private var size: Int = 0
+    private var oldSize: Int = 0
 
     init {
         try {
             if (countersFile.exists()) {
                 val lines = countersFile.readLines()
                 size = lines[0].toInt()
+                oldSize = size
             }
         } catch (e: Exception) {
             throw IOException("Could not read $countersFile", e)
@@ -120,13 +122,15 @@ open class LookupStorage(
     @Synchronized
     override fun flush(memoryCachesOnly: Boolean) {
         try {
-            if (size > 0) {
-                if (!countersFile.exists()) {
-                    countersFile.parentFile.mkdirs()
-                    countersFile.createNewFile()
-                }
+            if (size != oldSize) {
+                if (size > 0) {
+                    if (!countersFile.exists()) {
+                        countersFile.parentFile.mkdirs()
+                        countersFile.createNewFile()
+                    }
 
-                countersFile.writeText("$size\n0")
+                    countersFile.writeText("$size\n0")
+                }
             }
         } finally {
             super.flush(memoryCachesOnly)