From 327682cb698a4da770e0667ac549fdee0af522a8 Mon Sep 17 00:00:00 2001
From: tariq1890 <tariq181290@gmail.com>
Date: Mon, 30 Jul 2018 00:12:37 -0700
Subject: [PATCH] Fixing an edge case in lockdiff where all the projects may be
 removed from the lock file.

---
 gps/verify/lockdiff.go      | 7 +++++++
 gps/verify/lockdiff_test.go | 4 ++++
 2 files changed, 11 insertions(+)

diff --git a/gps/verify/lockdiff.go b/gps/verify/lockdiff.go
index 525a46db0e..6618e336c7 100644
--- a/gps/verify/lockdiff.go
+++ b/gps/verify/lockdiff.go
@@ -95,6 +95,13 @@ func DiffLocks(l1, l2 gps.Lock) LockDelta {
 			Name: pr1,
 		}
 
+		// Edge case: If there are no lockedProjects on the RHS, they have most probably been removed from the lock file.
+		if len(p2) == 0 {
+			lpd.ProjectRemoved = true
+			diff.ProjectDeltas[pr1] = lpd
+			continue
+		}
+
 		for i2 := i2next; i2 < len(p2); i2++ {
 			lp2 := p2[i2]
 			pr2 := lp2.Ident().ProjectRoot
diff --git a/gps/verify/lockdiff_test.go b/gps/verify/lockdiff_test.go
index 52955a392d..a368f8c76c 100644
--- a/gps/verify/lockdiff_test.go
+++ b/gps/verify/lockdiff_test.go
@@ -118,6 +118,10 @@ func TestLockDelta(t *testing.T) {
 			lt:    dup.addII("other.org").rmII("baz.com/qux").addDumbProject("zebrafun.org").rmProject("foo.com/bar"),
 			delta: InputImportsChanged | ProjectRemoved | ProjectAdded,
 		},
+		"remove all projects and imports": {
+			lt:    dup.rmII("baz.com/qux").rmII("foo.com/bar").rmProject("baz.com/qux").rmProject("foo.com/bar").rmProject("transitive.com/dependency"),
+			delta: InputImportsChanged | ProjectRemoved,
+		},
 	}
 
 	for name, fix := range tt {