exec: add execfunc to simplify exec flag support on non-exec filesystems

exec: add execfunc to simplify exec flag support on non-exec filesystems

--- a/mercurial/context.py	Fri Dec 29 20:04:30 2006 -0600
+++ b/mercurial/context.py	Fri Dec 29 20:04:30 2006 -0600
@@ -378,13 +378,14 @@
         """generate a manifest corresponding to the working directory"""
 
         man = self._parents[0].manifest().copy()
+        is_exec = util.execfunc(self._repo.root, man.execf)
         copied = self._repo.dirstate.copies()
         modified, added, removed, deleted, unknown = self._status[:5]
         for i, l in (("a", added), ("m", modified), ("u", unknown)):
             for f in l:
                 man[f] = man.get(copied.get(f, f), nullid) + i
                 try:
-                    man.set(f, util.is_exec(self._repo.wjoin(f), man.execf(f)))
+                    man.set(f, is_exec(f))
                 except OSError:
                     pass
 

--- a/mercurial/localrepo.py	Fri Dec 29 20:04:30 2006 -0600
+++ b/mercurial/localrepo.py	Fri Dec 29 20:04:30 2006 -0600
@@ -712,11 +712,12 @@
         new = {}
         linkrev = self.changelog.count()
         commit.sort()
+        is_exec = util.execfunc(self.root, m1.execf)
         for f in commit:
             self.ui.note(f + "\n")
             try:
                 new[f] = self.filecommit(f, m1, m2, linkrev, tr, changed)
-                m1.set(f, util.is_exec(self.wjoin(f), m1.execf(f)))
+                m1.set(f, is_exec(f))
             except IOError:
                 if use_dirstate:
                     self.ui.warn(_("trouble committing %s!\n") % f)
@@ -877,9 +878,10 @@
                 # generate a pseudo-manifest for the working dir
                 # XXX: create it in dirstate.py ?
                 mf2 = mfmatches(self.dirstate.parents()[0])
+                is_exec = util.execfunc(self.root, mf2.execf)
                 for f in lookup + modified + added:
                     mf2[f] = ""
-                    mf2.set(f, execf=util.is_exec(self.wjoin(f), mf2.execf(f)))
+                    mf2.set(f, is_exec(f))
                 for f in removed:
                     if f in mf2:
                         del mf2[f]

--- a/mercurial/patch.py	Fri Dec 29 20:04:30 2006 -0600
+++ b/mercurial/patch.py	Fri Dec 29 20:04:30 2006 -0600
@@ -524,6 +524,7 @@
     all = modified + added + removed
     all.sort()
     gone = {}
+
     for f in all:
         to = None
         tn = None

--- a/mercurial/util.py	Fri Dec 29 20:04:30 2006 -0600
+++ b/mercurial/util.py	Fri Dec 29 20:04:30 2006 -0600
@@ -707,6 +707,12 @@
     os.unlink(fn)
     return r
 
+def execfunc(path, fallback):
+    '''return an is_exec() function with default to fallback'''
+    if checkexec(path):
+        return lambda x: is_exec(os.path.join(path, x), False)
+    return fallback
+
 # Platform specific variants
 if os.name == 'nt':
     import msvcrt