From: the openembedded project <http://openembedded.net/>
Date: Fri, 22 Jan 2010 11:05:14 +0100
Subject: [PATCH] ipkg-make-index-track-stamps

---
 ipkg-make-index | 29 ++++++++++++++++++++++++++---
 1 file changed, 26 insertions(+), 3 deletions(-)

diff --git a/ipkg-make-index b/ipkg-make-index
index 8924dd0..6a49849 100755
--- a/ipkg-make-index
+++ b/ipkg-make-index
@@ -40,6 +40,7 @@ def to_locale(filename, locale):
 old_filename = None
 packages_filename = None
 filelist_filename = "Packages.filelist"
+stamplist_filename = "Packages.stamps"
 opt_s = 0
 opt_m = 0
 (opts, remaining_args) = getopt.getopt(sys.argv[1:], "hl:p:vsmr:L:")
@@ -50,6 +51,7 @@ for (optkey, optval) in opts:
           opt_s = 1
      if optkey == '-p': 
           packages_filename = optval
+          stamplist_filename = optval + ".stamps"
      if optkey == '-l':
           filelist_filename = optval
      if optkey == '-v':
@@ -72,6 +74,7 @@ old_pkg_hash = {}
 if packages_filename and not old_filename and os.path.exists(packages_filename):
      old_filename = packages_filename
 
+pkgsStamps = {}
 if old_filename:
      if (verbose):
           sys.stderr.write("Reading package list from " + old_filename + "\n")
@@ -80,6 +83,14 @@ if old_filename:
      for k in old_packages.packages.keys():
           p = old_packages.packages[k]
           old_pkg_hash[p.filename] = p
+     try:
+        f = open(stamplist_filename, "r")
+        for l in f:
+            l = l.strip()
+            s, f = l.split(" ", 1)
+            pkgsStamps[f] = int(s)
+     except IOError:
+        pass
 
 if (verbose):
      sys.stderr.write("Reading in all the package info from %s\n" % (pkg_dir, ))
@@ -87,11 +98,17 @@ files=glob(pkg_dir + '/*.ipk') + glob(pkg_dir + '/*.deb')
 files.sort()
 for filename in files:
      basename = os.path.basename(filename)
+     pkg = None
+     fnameStat = os.stat(filename)
      if old_pkg_hash.has_key(basename):
-          if (verbose):
+          if pkgsStamps.has_key(basename) and fnameStat.st_mtime == pkgsStamps[basename]:
+            if (verbose):
                sys.stderr.write("Found %s in Packages\n" % (filename,))
-          pkg = old_pkg_hash[basename]
-     else:
+            pkg = old_pkg_hash[basename]
+          else:
+               sys.stderr.write("Found %s in Packages, but mtime differs - re-reading\n" % (filename,))
+
+     if not pkg:
           if (verbose):
                sys.stderr.write("Reading info for package %s\n" % (filename,))
           pkg = ipkg.Package(filename)
@@ -101,6 +118,7 @@ for filename in files:
      else:
           old_filename = ""
      s = packages.add_package(pkg)
+     pkgsStamps[basename] = fnameStat.st_mtime
      if s == 0:
           if old_filename:
                # old package was displaced by newer
@@ -114,6 +132,11 @@ for filename in files:
           if opt_s:
                print filename
 
+pkgsStampsFile = open(stamplist_filename, "w")
+for f in pkgsStamps.keys():
+    pkgsStampsFile.write("%d %s\n" % (pkgsStamps[f], f))
+pkgsStampsFile.close()
+
 if opt_s:
      sys.exit(0)