--- a/b2g/dev/config/tooltool-manifests/linux64/hazard.manifest
+++ b/b2g/dev/config/tooltool-manifests/linux64/hazard.manifest
@@ -19,19 +19,19 @@
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--- a/b2g/dev/config/tooltool-manifests/linux64/releng.manifest
+++ b/b2g/dev/config/tooltool-manifests/linux64/releng.manifest
@@ -11,19 +11,19 @@
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--- a/browser/config/tooltool-manifests/linux32/releng.manifest
+++ b/browser/config/tooltool-manifests/linux32/releng.manifest
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--- a/browser/config/tooltool-manifests/linux64/asan.manifest
+++ b/browser/config/tooltool-manifests/linux64/asan.manifest
@@ -11,19 +11,19 @@
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--- a/browser/config/tooltool-manifests/linux64/clang.manifest
+++ b/browser/config/tooltool-manifests/linux64/clang.manifest
@@ -11,19 +11,19 @@
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--- a/browser/config/tooltool-manifests/linux64/clang.manifest.centos6
+++ b/browser/config/tooltool-manifests/linux64/clang.manifest.centos6
@@ -11,19 +11,19 @@
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--- a/browser/config/tooltool-manifests/linux64/hazard.manifest
+++ b/browser/config/tooltool-manifests/linux64/hazard.manifest
@@ -19,19 +19,19 @@
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--- a/browser/config/tooltool-manifests/linux64/msan.manifest
+++ b/browser/config/tooltool-manifests/linux64/msan.manifest
@@ -11,19 +11,19 @@
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--- a/browser/config/tooltool-manifests/linux64/releng.manifest
+++ b/browser/config/tooltool-manifests/linux64/releng.manifest
@@ -11,19 +11,19 @@
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--- a/browser/config/tooltool-manifests/macosx64/clang.manifest
+++ b/browser/config/tooltool-manifests/macosx64/clang.manifest
@@ -3,19 +3,19 @@
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--- a/browser/config/tooltool-manifests/macosx64/cross-releng.manifest
+++ b/browser/config/tooltool-manifests/macosx64/cross-releng.manifest
@@ -44,16 +44,16 @@
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--- a/browser/config/tooltool-manifests/macosx64/releng.manifest
+++ b/browser/config/tooltool-manifests/macosx64/releng.manifest
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--- a/browser/config/tooltool-manifests/win32/build-clang-cl.manifest
+++ b/browser/config/tooltool-manifests/win32/build-clang-cl.manifest
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--- a/browser/config/tooltool-manifests/win32/clang.manifest
+++ b/browser/config/tooltool-manifests/win32/clang.manifest
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--- a/browser/config/tooltool-manifests/win32/releng.manifest
+++ b/browser/config/tooltool-manifests/win32/releng.manifest
@@ -1,19 +1,19 @@
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+"digest": "d3a43d755a9819029421ef7f0f2997f79d4e327b38715878e097b633f858e7fb36882eef19ca59751487cef89692f8d082babf1b8196342e75bfe6b1ad9d8e7f",
 "algorithm": "sha512",
 "filename": "rustc.tar.bz2",
 "unpack": true
 },
 {
 "version": "sccache rev b21198a7183a2fe226ff49348b1c0b51bae9f4f8",
 "algorithm": "sha512",
 "visibility": "public",

--- a/browser/config/tooltool-manifests/win64/clang.manifest
+++ b/browser/config/tooltool-manifests/win64/clang.manifest
@@ -1,19 +1,19 @@
 [
 {
 "size": 266240,
 "digest": "bb345b0e700ffab4d09436981f14b5de84da55a3f18a7f09ebc4364a4488acdeab8d46f447b12ac70f2da1444a68b8ce8b8675f0dae2ccf845e966d1df0f0869",
 "algorithm": "sha512",
 "filename": "mozmake.exe"
 },
 {
-"version": "rustc 1.14.0 (e8a012324 2016-12-16) repack",
-"size": 69760089,
-"digest": "1ad9b88c90c70a11b76526a437f0f4df9590cd3dced50229a306b4b49fbf22b45871461cff9e33c8aabd00ef7734732f09dae131f1805587bac864e63f24f68f",
+"version": "rustc 1.14.0-beta.2 (e627a2e6e 2016-11-16) repack",
+"size": 69780370,
+"digest": "9eb86b4345f974470efbaddadf9f462af019be3ea4318471eea3c6dbe6e4c2108af7c6d6130b396ecb6550aa105ab8102dfa85b8964ebc1611061e485581cbf3",
 "algorithm": "sha512",
 "visibility": "public",
 "filename": "rustc.tar.bz2",
 "unpack": true
 },
 {
 "version": "sccache rev b21198a7183a2fe226ff49348b1c0b51bae9f4f8",
 "algorithm": "sha512",

--- a/browser/config/tooltool-manifests/win64/releng.manifest
+++ b/browser/config/tooltool-manifests/win64/releng.manifest
@@ -1,19 +1,19 @@
 [
 {
 "size": 266240,
 "digest": "bb345b0e700ffab4d09436981f14b5de84da55a3f18a7f09ebc4364a4488acdeab8d46f447b12ac70f2da1444a68b8ce8b8675f0dae2ccf845e966d1df0f0869",
 "algorithm": "sha512",
 "filename": "mozmake.exe"
 },
 {
-"version": "rustc 1.14.0 (e8a012324 2016-12-16) repack",
-"size": 69760089,
-"digest": "1ad9b88c90c70a11b76526a437f0f4df9590cd3dced50229a306b4b49fbf22b45871461cff9e33c8aabd00ef7734732f09dae131f1805587bac864e63f24f68f",
+"version": "rustc 1.14.0-beta.2 (e627a2e6e 2016-11-16) repack",
+"size": 69780370,
+"digest": "9eb86b4345f974470efbaddadf9f462af019be3ea4318471eea3c6dbe6e4c2108af7c6d6130b396ecb6550aa105ab8102dfa85b8964ebc1611061e485581cbf3",
 "algorithm": "sha512",
 "visibility": "public",
 "filename": "rustc.tar.bz2",
 "unpack": true
 },
 {
 "version": "sccache rev b21198a7183a2fe226ff49348b1c0b51bae9f4f8",
 "algorithm": "sha512",

--- a/mobile/android/config/tooltool-manifests/android-gradle-dependencies/releng.manifest
+++ b/mobile/android/config/tooltool-manifests/android-gradle-dependencies/releng.manifest
@@ -10,19 +10,19 @@
 "size": 573952124,
 "visibility": "internal",
 "digest": "1d495d7a7386af3f27b14982e0ff7b0963fd1a63a08040b9b1db0e94c9681fa3704c195ba8be23b5f73e15101b2b767293bc8f96e0584e17867ef13b074e5038",
 "algorithm": "sha512",
 "filename": "android-sdk-linux.tar.xz",
 "unpack": true
 },
 {
-"version": "rustc 1.14.0 (e8a012324 2016-12-16) repack",
-"size": 105698380,
-"digest": "e4ee593a08ee63bf0c350dab040a769acd1c028201086707bce50b953653d3ee072a7b29667cb9e77c5c4fa0fd5aa5ed90d5f022339d8a136e705363a42863e2",
+"version": "rustc 1.14.0-beta.2 (e627a2e6e 2016-11-16) repack",
+"size": 75964276,
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 "algorithm": "sha512",
 "filename": "rustc.tar.xz",
 "unpack": true
 },
 {
 "version": "sccache rev b21198a7183a2fe226ff49348b1c0b51bae9f4f8",
 "algorithm": "sha512",
 "visibility": "public",

--- a/mobile/android/config/tooltool-manifests/android-x86/releng.manifest
+++ b/mobile/android/config/tooltool-manifests/android-x86/releng.manifest
@@ -43,19 +43,19 @@
 "version": "gcc 4.9.4 + PR64905",
 "size": 101297752,
 "digest": "42aa2e3fdd232b5e390472a788e7f7db71a1fee4221e260b6cb58c9a1d73e6cdd10afcbac137f7844290169cd6b561b424ecc92b159e9726b0ad5de3f478a8be",
 "algorithm": "sha512",
 "filename": "gcc.tar.xz",
 "unpack": true
 },
 {
-"version": "rustc 1.14.0 (e8a012324 2016-12-16) repack",
-"size": 105698380,
-"digest": "e4ee593a08ee63bf0c350dab040a769acd1c028201086707bce50b953653d3ee072a7b29667cb9e77c5c4fa0fd5aa5ed90d5f022339d8a136e705363a42863e2",
+"version": "rustc 1.14.0-beta.2 (e627a2e6e 2016-11-16) repack",
+"size": 75964276,
+"digest": "3a83a42330cdc42fbffcd91aa80f8e33749c716068047699fbd0ee5b5c51ec350f60285b34fd45d9bb038a5af9118e16ab66cbf0a7167eed5a6d239f50e32462",
 "algorithm": "sha512",
 "filename": "rustc.tar.xz",
 "unpack": true
 },
 {
 "algorithm": "sha512",
 "visibility": "public",
 "filename": "jcentral.tar.xz",

--- a/mobile/android/config/tooltool-manifests/android/releng.manifest
+++ b/mobile/android/config/tooltool-manifests/android/releng.manifest
@@ -68,19 +68,19 @@
 "algorithm": "sha512",
 "visibility": "public",
 "filename": "gradle-dist.tar.xz",
 "unpack": true,
 "digest": "e3cfe7f8259ad97722243d4e873d5a05c014bfc24d637427f89d804bf5073290229c778ea303142cf06c2dc79e0492f23521f57d3a73825f55b8db587317646f",
 "size": 51753660
 },
 {
-"version": "rustc 1.14.0 (e8a012324 2016-12-16) repack",
-"size": 105698380,
-"digest": "e4ee593a08ee63bf0c350dab040a769acd1c028201086707bce50b953653d3ee072a7b29667cb9e77c5c4fa0fd5aa5ed90d5f022339d8a136e705363a42863e2",
+"version": "rustc 1.14.0-beta.2 (e627a2e6e 2016-11-16) repack",
+"size": 75964276,
+"digest": "3a83a42330cdc42fbffcd91aa80f8e33749c716068047699fbd0ee5b5c51ec350f60285b34fd45d9bb038a5af9118e16ab66cbf0a7167eed5a6d239f50e32462",
 "algorithm": "sha512",
 "filename": "rustc.tar.xz",
 "unpack": true
 },
 {
 "algorithm": "sha512",
 "visibility": "public",
 "filename": "dotgradle.tar.xz",

--- a/taskcluster/docker/rust-build/VERSION
+++ b/taskcluster/docker/rust-build/VERSION
@@ -1,1 +1,1 @@
-0.4.1
+0.4.0

--- a/taskcluster/docker/rust-build/repack_rust.py
+++ b/taskcluster/docker/rust-build/repack_rust.py
@@ -1,53 +1,44 @@
 #!/bin/env python
 '''
 This script downloads and repacks official rust language builds
 with the necessary tool and target support for the Firefox
 build environment.
 '''
 
 import os.path
-import sys
-
 import requests
 import subprocess
 import toml
 
 
 def fetch_file(url):
     '''Download a file from the given url if it's not already present.'''
     filename = os.path.basename(url)
     if os.path.exists(filename):
         return
     r = requests.get(url, stream=True)
     r.raise_for_status()
     with open(filename, 'wb') as fd:
         for chunk in r.iter_content(4096):
             fd.write(chunk)
 
-def sha256sum():
-    '''Return the command for verifying SHA-2 256-bit checksums.'''
-    if sys.platform.startswith('darwin'):
-        return 'shasum'
-    else:
-        return 'sha256sum'
 
 def fetch(url):
     '''Download and verify a package url.'''
     base = os.path.basename(url)
     print('Fetching %s...' % base)
     fetch_file(url + '.asc')
     fetch_file(url)
     fetch_file(url + '.sha256')
     fetch_file(url + '.asc.sha256')
     print('Verifying %s...' % base)
-    shasum = sha256sum()
-    subprocess.check_call([shasum, '-c', base + '.sha256'])
-    subprocess.check_call([shasum, '-c', base + '.asc.sha256'])
+    subprocess.check_call(['shasum', '-c', base + '.sha256'])
+    subprocess.check_call(['shasum', '-c', base + '.asc.sha256'])
     subprocess.check_call(['gpg', '--verify', base + '.asc', base])
     if False:
         subprocess.check_call([
             'keybase', 'pgp', 'verify', '-d', base + '.asc', '  -i', base,
         ])
 
 
 def install(filename, target):