bitbake build.py: Add interactive flag for tasks to allow i/o redirection to be disabled. Also fix NFS stamp error

git-svn-id: https://svn.o-hand.com/repos/poky/trunk@681 311d38ba-8fff-0310-9ca6-ca027cbcb966

bitbake/lib/bb/build.py

@@ -148,6 +148,7 @@ def exec_func_shell(func, d):
 
     deps = data.getVarFlag(func, 'deps', d)
     check = data.getVarFlag(func, 'check', d)
+    interact = data.getVarFlag(func, 'interactive', d)
     if check in globals():
         if globals()[check](func, deps):
             return
@@ -186,6 +187,7 @@ def exec_func_shell(func, d):
 
     se = so
 
+    if not interact:
         # dup the existing fds so we dont lose them
         osi = [os.dup(sys.stdin.fileno()), sys.stdin.fileno()]
         oso = [os.dup(sys.stdout.fileno()), sys.stdout.fileno()]
@@ -205,6 +207,7 @@ def exec_func_shell(func, d):
     ret = os.system('%ssh -e %s' % (maybe_fakeroot, runfile))
     os.chdir(prevdir)
 
+    if not interact:
         # restore the backups
         os.dup2(osi[0], osi[1])
         os.dup2(oso[0], oso[1])
@@ -350,7 +353,12 @@ def mkstamp(task, d):
         return
     stamp = "%s.%s" % (data.expand(stamp, d), task)
     mkdirhier(os.path.dirname(stamp))
-    open(stamp, "w+")
+    # Remove the file and recreate to force timestamp
+    # change on broken NFS filesystems
+    if os.access(stamp, os.F_OK):
+        os.remove(stamp)
+    f = open(stamp, "w")
+    f.close()
 
 
 def add_task(task, deps, d):