Suggest python-simplejson | python (>= 2.7) and complain if they are missing in pull-debian-debdiff

debian/control

@@ -16,7 +16,6 @@ Build-Depends: dctrl-tools,
                python-apt (>= 0.7.93~),
                python-debian (>= 0.1.15),
                python-gnupginterface,
-               python-simplejson,
                python-launchpadlib (>= 1.5.7),
                python-magic,
                python-setuptools,
@@ -57,7 +56,7 @@ Recommends: bzr,
             python-magic,
             python-soappy,
             reportbug (>= 3.39ubuntu1)
-Suggests: qemu-kvm-extras-static
+Suggests: python-simplejson | python (>= 2.7), qemu-kvm-extras-static
 Breaks: ${python:Breaks}
 Description: useful tools for Ubuntu developers
  This is a collection of useful tools that Ubuntu developers use to make their

pull-debian-debdiff

@@ -25,10 +25,6 @@ import sys
 import urllib2
 
 import debian.changelog
-try:
-    import json
-except ImportError:
-    import simplejson as json
 
 from ubuntutools.config import UDTConfig
 from ubuntutools.logger import Logger
@@ -63,6 +59,15 @@ def pull(package, version, unpack=False):
 
 def pull_from_snapshot(package, version, unpack=False):
     "Download Debian source package version version from snapshot.debian.org"
+    try:
+        import json
+    except ImportError:
+        import simplejson as json
+    except ImportError:
+        Logger.error("Require python-simplejson or python >= 2.7 to be "
+                     "installed for snapshot.debian.org support")
+        sys.exit(1)
+
     try:
         srcfiles = json.load(urllib2.urlopen(
                 'http://snapshot.debian.org/mr/package/%s/%s/srcfiles'
@@ -71,6 +76,7 @@ def pull_from_snapshot(package, version, unpack=False):
         Logger.error('Version %s of %s not found on snapshot.debian.org',
                      version, package)
         return False
+
     for hash_ in srcfiles['result']:
         hash_ = hash_['hash']
 
@@ -167,6 +173,11 @@ def main():
     version = args[1]
     distance = args[2] if len(args) > 2 else 1
 
+    if not os.path.exists('/usr/bin/dget'):
+        Logger.error("dget is not installed. "
+                     "Please install the 'devscripts' package.")
+        sys.exit(1)
+
     config = UDTConfig(opts.no_conf)
     if opts.debian_mirror is None:
         opts.debian_mirror = config.get_value('DEBIAN_MIRROR')