Fix one-shot sync of a rev

cmd/git-sync/main.go

@@ -179,16 +179,16 @@ func main() {
 			continue
 		}
 		if initialSync {
+			if *flOneTime {
+				os.Exit(0)
+			}
 			if isHash, err := revIsHash(*flRev, *flRoot); err != nil {
 				log.Errorf("can't tell if rev %s is a git hash, exiting", *flRev)
 				os.Exit(1)
 			} else if isHash {
 				log.V(0).Infof("rev %s appears to be a git hash, no further sync needed", *flRev)
 				sleepForever()
 			}
-			if *flOneTime {
-				os.Exit(0)
-			}
 			initialSync = false
 		}
 

test_e2e.sh

@@ -369,5 +369,27 @@ pkill git-sync
 wait
 pass
 
+# Test rev-sync one-time
+testcase "rev-once"
+# First sync
+echo "$TESTCASE" > "$REPO"/file
+git -C "$REPO" commit -qam "$TESTCASE"
+REV=$(git -C "$REPO" rev-list -n1 HEAD)
+GIT_SYNC \
+    --logtostderr \
+    --v=5 \
+    --wait=0.1 \
+    --repo="$REPO" \
+    --rev="$REV" \
+    --root="$ROOT" \
+    --dest="link" \
+    --one-time > "$DIR"/log."$TESTCASE" 2>&1
+sleep 2
+assert_link_exists "$ROOT"/link
+assert_file_exists "$ROOT"/link/file
+assert_file_eq "$ROOT"/link/file "$TESTCASE"
+# Wrap up
+pass
+
 echo "cleaning up $DIR"
 rm -rf "$DIR"