#430: Add internal root field

Author: DmitryNekrasov

core/linux/src/internal/TimeZoneNative.kt

@@ -20,22 +20,22 @@ private val tzdb = runCatching { TzdbOnFilesystem() }
 
 @OptIn(ExperimentalForeignApi::class)
 private fun getTimezoneFromEtcTimezone(): String? {
-    val timezoneContent = Path.fromString("/etc/timezone").readBytes()?.toKString()?.trim() ?: return null
-    val zoneId = chaseSymlinks("/usr/share/zoneinfo/$timezoneContent")
+    val timezoneContent = Path.fromString("${root}etc/timezone").readBytes()?.toKString()?.trim() ?: return null
+    val zoneId = chaseSymlinks("${root}usr/share/zoneinfo/$timezoneContent")
         ?.splitTimeZonePath()?.second?.toString()
         ?: return null
 
-    val zoneInfoBytes = Path.fromString("/usr/share/zoneinfo/$zoneId").readBytes() ?: return null
-    val localtimeBytes = Path.fromString("/etc/localtime").readBytes() ?: return null
+    val zoneInfoBytes = Path.fromString("${root}usr/share/zoneinfo/$zoneId").readBytes() ?: return null
+    val localtimeBytes = Path.fromString("${root}etc/localtime").readBytes() ?: return null
 
     if (!localtimeBytes.contentEquals(zoneInfoBytes)) {
         val displayTimezone = when (timezoneContent) {
             zoneId -> "'$zoneId'"
             else -> "'$timezoneContent' (resolved to '$zoneId')"
         }
         throw IllegalTimeZoneException(
-            "Timezone mismatch: /etc/timezone specifies $displayTimezone " +
-                    "but /etc/localtime content differs from /usr/share/zoneinfo/$zoneId"
+            "Timezone mismatch: ${root}etc/timezone specifies $displayTimezone " +
+                    "but ${root}etc/localtime content differs from ${root}usr/share/zoneinfo/$zoneId"
         )
     }
 

core/tzdbOnFilesystem/src/internal/TzdbOnFilesystem.kt

@@ -47,7 +47,9 @@ internal fun tzdbPaths(defaultTzdbPath: Path?) = sequence {
     currentSystemTimeZonePath?.splitTimeZonePath()?.first?.let { yield(it) }
 }
 
-internal val currentSystemTimeZonePath get() = chaseSymlinks("/etc/localtime")
+internal var root: String = "/"
+
+internal val currentSystemTimeZonePath get() = chaseSymlinks("${root}etc/localtime")
 
 /**
  * Given a path like `/usr/share/zoneinfo/Europe/Berlin`, produces `/usr/share/zoneinfo to Europe/Berlin`.