Throw HumanReadableException when initializing SQLite fails

Summary:
Hopefully this is the last time I have to twiddle this error handling
path... the existing solution had a couple minor irritations: (1) the failure
showed up as a NoClassDefFound exception, which hides the real root cause, and
(2) throwing it as a RuntimeException pollutes logging and the user's console.

So, we'll tweak this slightly to use a synchronized static method instead of a
static initializer, and throw a nice pretty HumanReadableException.  Since most
of the time this error is caused by not having space for the .so, I'll even
suggest that the user may be low on disk space.

Test Plan:
mount buck-out/tmp on a tiny volume to trigger the error:
```
BUILD FAILED: Failed to initialize sqlite-jdbc.  Is your disk full?
```

Reviewed By: dinhviethoa

fbshipit-source-id: fa0ca96

src/com/facebook/buck/rules/SQLiteBuildInfoStore.java

@@ -36,11 +36,8 @@ public class SQLiteBuildInfoStore implements BuildInfoStore {
   private final PreparedStatement updateStmt;
   private final PreparedStatement deleteStmt;
 
-  static {
-    SQLiteUtils.initialize();
-  }
-
   public SQLiteBuildInfoStore(ProjectFilesystem filesystem) throws IOException {
+    SQLiteUtils.initialize();
     String dbPath =
         filesystem
             .getRootPath()

src/com/facebook/buck/sqlite/BUCK

@@ -3,6 +3,7 @@ java_library(
     srcs = glob(["*.java"]),
     visibility = ["PUBLIC"],
     deps = [
+        "//src/com/facebook/buck/util:exceptions",
         "//third-party/java/sqlite:sqlite",
     ],
 )

src/com/facebook/buck/sqlite/SQLiteUtils.java

@@ -16,6 +16,7 @@
 
 package com.facebook.buck.sqlite;
 
+import com.facebook.buck.util.HumanReadableException;
 import org.sqlite.SQLiteJDBCLoader;
 
 public class SQLiteUtils {
@@ -28,13 +29,17 @@ private SQLiteUtils() {
    * thread-unsafe manner. This method should be called statically from any class that uses
    * SQLiteJDBC.
    */
-  public static void initialize() {
+  public static synchronized void initialize() {
+    boolean success;
     try {
-      if (!SQLiteJDBCLoader.initialize()) {
-        throw new RuntimeException("sqlite-jdbc initialization failed");
-      }
+      success = SQLiteJDBCLoader.initialize();
     } catch (Exception e) {
       throw new RuntimeException(e);
     }
+    if (!success) {
+      throw new HumanReadableException(
+          "Failed to initialize Buck (sqlite-jdbc). A common reason is that the disk is full. "
+              + "Please try to clean up your disk and try again.");
+    }
   }
 }