tunnel: do not constantly raise toasts when process is opportunistically killed

Modern Android likes to kill processes to free ram and resources. When
kernel-mode WireGuard is in use, this is quite alright with us, since
the app doesn't actually need to consume any resources at all in order
for the tunnel to run. So, we want to allow and encourage this resource
frugality. However, when the quick settings tile is being used or when
the app is referenced otherwise, the app will occasionally be restarted,
to, for example, repaint the quick settings tile. This is also fine, as
the process winds up being short-lived again. But, since process
initialization means asking for a new root shell in order to check on
kernel-mode WireGuard, this means that Magisk raises a systemwide toast.
On some phones, this happens each and every time that the notification
shade is pulled down. It's not only annoying but it sometimes obscures
other notifications that users want to see, prompting their pulling down
of the notification shade in the first place. In order to get rid of
this nuisance, just disable these notifications and extraneous logs, so
that we don't clutter the system every time that the process is
opportunistically killed and restarted.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/tunnel/src/main/java/com/wireguard/android/util/RootShell.java b/tunnel/src/main/java/com/wireguard/android/util/RootShell.java
index 6fe89a83..90071573 100644
--- a/tunnel/src/main/java/com/wireguard/android/util/RootShell.java
+++ b/tunnel/src/main/java/com/wireguard/android/util/RootShell.java
@@ -43,8 +43,11 @@ public class RootShell {
     public RootShell(final Context context) {
         localBinaryDir = new File(context.getCodeCacheDir(), "bin");
         localTemporaryDir = new File(context.getCacheDir(), "tmp");
-        preamble = String.format("export CALLING_PACKAGE=%s PATH=\"%s:$PATH\" TMPDIR='%s'; id -u\n",
-                context.getPackageName(), localBinaryDir, localTemporaryDir);
+        final String packageName = context.getPackageName();
+        if (packageName.contains("'"))
+            throw new RuntimeException("Impossibly invalid package name contains a single quote");
+        preamble = String.format("export CALLING_PACKAGE=%s PATH=\"%s:$PATH\" TMPDIR='%s'; magisk --sqlite \"UPDATE policies SET notification=0, logging=0 WHERE package_name='%s'\" >/dev/null 2>&1; id -u\n",
+                packageName, localBinaryDir, localTemporaryDir, packageName);
     }
 
     private static boolean isExecutableInPath(final String name) {