From 7375e09d191ee9a9562911a9ea38e6cb08824bae Mon Sep 17 00:00:00 2001
From: Peter Serwylo <peter@serwylo.com>
Date: Wed, 26 Apr 2017 08:38:41 +1000
Subject: [PATCH] Fail softly, notifying user of failure rather than crashing,

---
 .../org/fdroid/fdroid/installer/ApkSignatureVerifier.java  | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/app/src/main/java/org/fdroid/fdroid/installer/ApkSignatureVerifier.java b/app/src/main/java/org/fdroid/fdroid/installer/ApkSignatureVerifier.java
index da2a6a4e5..dd8ecaaa4 100644
--- a/app/src/main/java/org/fdroid/fdroid/installer/ApkSignatureVerifier.java
+++ b/app/src/main/java/org/fdroid/fdroid/installer/ApkSignatureVerifier.java
@@ -24,6 +24,7 @@ import android.content.Context;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
 import android.content.pm.Signature;
+import android.util.Log;
 
 import org.fdroid.fdroid.Utils;
 import org.spongycastle.util.encoders.Hex;
@@ -51,6 +52,12 @@ class ApkSignatureVerifier {
     }
 
     public boolean hasFDroidSignature(File apkFile) {
+        if (!apkFile.exists()) {
+            Log.e(TAG, "Failed to verify that " + apkFile.getName() + " has F-Droid signature, " +
+                    "because " + apkFile.getAbsolutePath() + " does not exist.");
+            return false;
+        }
+
         byte[] apkSig = getApkSignature(apkFile);
         byte[] fdroidSig = getFDroidSignature();