Disable SDK constraint checking on bleeding edge.

BUG=

Review URL: https://codereview.chromium.org//14247026

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@21773 260f80e4-7a28-3924-810f-c04153c831b5

utils/pub/sdk.dart

@@ -37,6 +37,12 @@ String get rootDirectory {
 /// Gets the SDK's revision number formatted to be a semantic version.
 Version version = _getVersion();
 
+/// Is `true` if the current SDK is an unreleased bleeding edge version.
+bool get isBleedingEdge {
+  // The live build is locked to the magical old number "0.1.2+<stuff>".
+  return version.major == 0 && version.minor == 1 && version.patch == 2;
+}
+
 /// Determine the SDK's version number.
 Version _getVersion() {
   var revisionPath = path.join(rootDirectory, "version");

utils/pub/solver/backtracking_solver.dart

@@ -588,6 +588,12 @@ class Traverser {
 /// Ensures that if [pubspec] has an SDK constraint, then it is compatible
 /// with the current SDK. Throws a [SolverFailure] if not.
 void _validateSdkConstraint(Pubspec pubspec) {
+  // If the user is running a continouous build of the SDK, just disable SDK
+  // constraint checking entirely. The actual version number you get is
+  // impossibly old and not correct. We'll just assume users on continuous
+  // know what they're doing.
+  if (sdk.isBleedingEdge) return;
+
   if (pubspec.environment.sdkVersion.allows(sdk.version)) return;
 
   throw new CouldNotSolveException(

utils/tests/pub/command_line_config.dart

@@ -154,7 +154,7 @@ class _StackFrame {
     if (match == null) {
       match = coreRegExp.firstMatch(text);
       if (match == null) {
-        throw FormatException("Couldn't parse stack trace line '$text'.");
+        throw new FormatException("Couldn't parse stack trace line '$text'.");
       }
       isCore = true;
     }

utils/tests/pub/version_solver_test.dart

@@ -611,11 +611,19 @@ sdkConstraint() {
     'foo': '2.0.0',
     'bar': '2.0.0'
   }, maxTries: 3);
+
+  testResolve('ignores SDK constraints on bleeding edge', {
+    'myapp 0.0.0': {'sdk': badVersion }
+  }, result: {
+    'myapp from root': '0.0.0'
+  }, useBleedingEdgeSdkVersion: true);
 }
 
 testResolve(description, packages,
-            {lockfile, result, FailMatcherBuilder error, int maxTries}) {
+            {lockfile, result, FailMatcherBuilder error, int maxTries,
+             bool useBleedingEdgeSdkVersion}) {
   if (maxTries == null) maxTries = 1;
+  if (useBleedingEdgeSdkVersion == null) useBleedingEdgeSdkVersion = false;
 
   test(description, () {
     var cache = new SystemCache('.');
@@ -666,6 +674,12 @@ testResolve(description, packages,
       });
     }
 
+    // Make a version number like the continuous build's version.
+    var previousVersion = sdk.version;
+    if (useBleedingEdgeSdkVersion) {
+      sdk.version = new Version(0, 1, 2, build: '0_r12345_juser');
+    }
+
     // Resolve the versions.
     var future = resolveVersions(cache.sources, root,
         lockFile: realLockFile);
@@ -677,6 +691,12 @@ testResolve(description, packages,
       matcher = error(maxTries);
     }
 
+    future = future.whenComplete(() {
+      if (useBleedingEdgeSdkVersion) {
+        sdk.version = previousVersion;
+      }
+    });
+
     expect(future, completion(matcher));
   });
 }