From 5e143d493eb088e3f5dce86e8906483e7efc909d Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Mon, 28 Sep 2020 12:02:54 +0200
Subject: [server] Abort orphan scan/delete if known image list is empty

On the off-chance that something goes wron when querying, or the
database got emptied, don't just blindly wipe the whole vmstore. It's
probably smarter to restore a backup first, or if you really mean to
start afresh, just empty the vmstore manually, or just upload one VM and
then use this feature again.
---
 dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/web/WebRpc.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/web/WebRpc.java b/dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/web/WebRpc.java
index 2709e567..1d5b27e7 100644
--- a/dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/web/WebRpc.java
+++ b/dozentenmodulserver/src/main/java/org/openslx/bwlp/sat/web/WebRpc.java
@@ -85,6 +85,9 @@ public class WebRpc {
 		} catch (SQLException e1) {
 			return WebServer.internalServerError("Cannot query list of known images from database");
 		}
+		if (known.isEmpty()) {
+			return WebServer.internalServerError("SAFTY CHECK: Known image list empty, aborting");
+		}
 		try {
 			// Consider only regular files, call checkFile for each one
 			Files.find(Configuration.getVmStoreProdPath().toPath(), 8,
-- 
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