Some very suspicious changes to relpath() and sname() calls.

The problem is that redo-ifchange has a different $PWD than its
sub-dependencies, so as it's chasing them down, fixing up the relative paths
totally doesn't work at all.

There's probably a much smarter fix than this, but it's too late at night to
think of it right now.

helpers.py

@@ -83,12 +83,17 @@ def relpath(t, base):
     return '/'.join(tparts)
 
 
-def sname(typ, t):
+def sname(typ, t, fromdir=None):
     # FIXME: t.replace(...) is non-reversible and non-unique here!
+    if fromdir:
+        t = os.path.join(fromdir, t)
     tnew = relpath(t, vars.BASE)
-    #log('sname: (%r) %r -> %r\n' % (vars.BASE, t, tnew))
+    v = vars.BASE + ('/.redo/%s^%s' % (typ, tnew.replace('/', '^')))
-    return vars.BASE + ('/.redo/%s^%s' % (typ, tnew.replace('/', '^')))
+    debug2('sname: (%r) %r -> %r\n' % (os.getcwd(), t, tnew))
+    return v
 
 
 def add_dep(t, mode, dep):
-    open(sname('dep', t), 'a').write('%s %s\n' % (mode, dep))
+    debug2('add-dep(%r)\n' % t)
+    open(sname('dep', t), 'a').write('%s %s\n'
+                                     % (mode, relpath(dep, vars.BASE)))

redo-ifchange.py

@@ -4,15 +4,15 @@ import vars
 from helpers import sname, add_dep, debug, err, mkdirp, unlink
 
 
-def _dirty_deps(t, depth):
+def _dirty_deps(t, depth, fromdir):
     debug('%s?%s\n' % (depth, t))
-    if not os.path.exists(sname('stamp', t)):
+    if not os.path.exists(sname('stamp', t, fromdir)):
         debug('%s-- DIRTY (no stamp)\n' % depth)
         return True
 
-    stamptime = os.stat(sname('stamp', t)).st_mtime
+    stamptime = os.stat(sname('stamp', t, fromdir)).st_mtime
     try:
-        realtime = os.stat(t).st_mtime
+        realtime = os.stat(os.path.join(fromdir or '', t)).st_mtime
     except OSError:
         realtime = 0
 
@@ -20,7 +20,7 @@ def _dirty_deps(t, depth):
         debug('%s-- DIRTY (mtime)\n' % depth)
         return True
     
-    for sub in open(sname('dep', t)).readlines():
+    for sub in open(sname('dep', t, fromdir)).readlines():
         assert(sub[0] in ('c','m'))
         assert(sub[1] == ' ')
         assert(sub[-1] == '\n')
@@ -31,15 +31,15 @@ def _dirty_deps(t, depth):
                 debug('%s-- DIRTY (created)\n' % depth)
                 return True
         elif mode == 'm':
-            if dirty_deps(name, depth + '  '):
+            if dirty_deps(name, depth + '  ', fromdir=vars.BASE):
                 #debug('%s-- DIRTY (sub)\n' % depth)
                 return True
     return False
 
 
-def dirty_deps(t, depth):
+def dirty_deps(t, depth, fromdir=None):
-    if _dirty_deps(t, depth):
+    if _dirty_deps(t, depth, fromdir):
-        unlink(sname('stamp', t))  # short circuit future checks
+        unlink(sname('stamp', t, fromdir))  # short circuit future checks
         return True
     return False
 

redo.py

@@ -93,7 +93,7 @@ def stamp(t):
 
 
 def _preexec(t):
-    os.environ['REDO_TARGET'] = t
+    os.environ['REDO_TARGET'] = os.path.basename(t)
     os.environ['REDO_DEPTH'] = vars.DEPTH + '  '
     dn = os.path.dirname(t)
     if dn: