Handle KeyboardInterrupt with less annoying spew to stderr.

redo-ifchange.py

@@ -48,6 +48,7 @@ if not vars.TARGET:
     err('redo-ifchange: error: must be run from inside a .do\n')
     sys.exit(100)
 
+try:
     want_build = []
     for t in sys.argv[1:]:
         mkdirp('%s/.redo' % vars.BASE)
@@ -57,3 +58,5 @@ for t in sys.argv[1:]:
 
     if want_build:
         os.execvp('redo', ['redo', '--'] + want_build)
+except KeyboardInterrupt:
+    sys.exit(200)

redo-ifcreate.py

@@ -8,6 +8,7 @@ if not vars.TARGET:
     err('redo-ifcreate: error: must be run from inside a .do\n')
     sys.exit(100)
 
+try:
     for t in sys.argv[1:]:
         mkdirp('%s/.redo' % vars.BASE)
         if os.path.exists(t):
@@ -15,3 +16,5 @@ for t in sys.argv[1:]:
             sys.exit(1)
         else:
             add_dep(vars.TARGET, 'c', t)
+except KeyboardInterrupt:
+    sys.exit(200)

redo.py

@@ -118,6 +118,7 @@ if not vars.DEPTH:
     dirnames = [os.path.dirname(p) for p in exenames]
     os.environ['PATH'] = ':'.join(dirnames) + ':' + os.environ['PATH']
 
+try:
     retcode = 0
     startdir = os.getcwd()
     for t in targets:
@@ -132,3 +133,5 @@ for t in targets:
             err('%s\n' % e)
             retcode = 1
     sys.exit(retcode)
+except KeyboardInterrupt:
+    sys.exit(200)