internal/pkg: abort all pending cures

This cancels all current pending cures without closing the cache.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/pkg/pkg_test.go

@@ -16,6 +16,7 @@ import (
 	"path/filepath"
 	"reflect"
 	"strconv"
+	"sync"
 	"syscall"
 	"testing"
 	"unique"
@@ -903,26 +904,46 @@ func TestCache(t *testing.T) {
 			<-wCureDone
 		}, pkg.MustDecode("E4vEZKhCcL2gPZ2Tt59FS3lDng-d_2SKa2i5G_RbDfwGn6EemptFaGLPUDiOa94C")},
 
-		{"cancel hanging", pkg.CValidateKnown, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
-			started := make(chan struct{})
-			go func() {
-				<-started
-				if !c.Cancel(unique.Make(pkg.ID{0xff})) {
-					panic("missed cancellation")
+		{"cancel abort block", pkg.CValidateKnown, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {
+			var wg sync.WaitGroup
+			defer wg.Wait()
+
+			var started sync.WaitGroup
+			defer started.Wait()
+
+			blockCures := func(d byte, n int) {
+				started.Add(n)
+				for i := range n {
+					wg.Go(func() {
+						if _, _, err := c.Cure(overrideIdent{pkg.ID{d, byte(i)}, &stubArtifact{
+							kind: pkg.KindTar,
+							cure: func(t *pkg.TContext) error {
+								started.Done()
+								<-t.Unwrap().Done()
+								return stub.UniqueError(0xbad0 + i)
+							},
+						}}); !reflect.DeepEqual(err, stub.UniqueError(0xbad0+i)) {
+							panic(err)
+						}
+					})
 				}
-			}()
-			if _, _, err := c.Cure(overrideIdent{pkg.ID{0xff}, &stubArtifact{
-				kind: pkg.KindTar,
-				cure: func(t *pkg.TContext) error {
-					close(started)
-					<-t.Unwrap().Done()
-					return stub.UniqueError(0xbad)
-				},
-			}}); !reflect.DeepEqual(err, stub.UniqueError(0xbad)) {
-				t.Fatalf("Cure: error = %v", err)
+				started.Wait()
 			}
+
+			blockCures(0xfd, 16)
+			c.Abort()
+			wg.Wait()
+
+			blockCures(0xff, 1)
+			if !c.Cancel(unique.Make(pkg.ID{0xff})) {
+				t.Fatal("missed cancellation")
+			}
+			wg.Wait()
 			for c.Cancel(unique.Make(pkg.ID{0xff})) {
 			}
+
+			c.Close()
+			c.Abort()
 		}, pkg.MustDecode("E4vEZKhCcL2gPZ2Tt59FS3lDng-d_2SKa2i5G_RbDfwGn6EemptFaGLPUDiOa94C")},
 
 		{"no assume checksum", 0, nil, func(t *testing.T, base *check.Absolute, c *pkg.Cache) {