1 files changed, 102 insertions, 0 deletions
diff --git a/classes/packagehistory.bbclass b/classes/packagehistory.bbclass
new file mode 100644
index 0000000000..fdc47cb9b4
--- /dev/null
+++ b/classes/packagehistory.bbclass
@@ -0,0 +1,102 @@
+# Must inherit package first before changing PACKAGEFUNCS
+inherit package
+PACKAGEFUNCS += "emit_pkghistory"
+
+PKGHIST_DIR = "${TMPDIR}/pkghistory/"
+
+
+#
+# Called during do_package to write out metadata about this package
+# for comparision when writing future packages
+#
+python emit_pkghistory() {
+	packages = bb.data.getVar('PACKAGES', d, True)
+	pkghistdir = bb.data.getVar('PKGHIST_DIR', d, True)
+
+
+	# Should check PACKAGES here to see if anything removed
+
+	def getpkgvar(pkg, var):
+		val = bb.data.getVar('%s_%s' % (var, pkg), d, 1)
+		if val:
+			return val
+		val = bb.data.getVar('%s' % (var), d, 1)
+
+		return val
+
+	def getlastversion(pkg):
+		try:
+			pe = os.path.basename(os.readlink(os.path.join(pkghistdir, pkg, "latest")))
+			pv = os.path.basename(os.readlink(os.path.join(pkghistdir, pkg, pe, "latest")))
+			pr = os.path.basename(os.readlink(os.path.join(pkghistdir, pkg, pe, pv, "latest")))
+			return (pe, pv, pr)
+		except OSError:
+			return (None, None, None)			
+
+	for pkg in packages.split():
+		pe = getpkgvar(pkg, 'PE') or "0"
+		pv = getpkgvar(pkg, 'PV')
+		pr = getpkgvar(pkg, 'PR')
+		destdir = os.path.join(pkghistdir, pkg, pe, pv, pr)
+		
+		#
+		# Find out what the last version was
+		# Make sure the version did not decrease
+		#
+		lastversion = getlastversion(pkg)
+		(last_pe, last_pv, last_pr) = lastversion
+
+		if last_pe is not None:
+			r = bb.utils.vercmp((pe, pv, pr), lastversion)
+			if r < 0:
+				bb.fatal("Package version for package %s went backwards which would break package feeds from (%s:%s-%s to %s:%s-%s)" % (pkg, last_pe, last_pv, last_pr, pe, pv, pr))
+
+		write_pkghistory(pkg, pe, pv, pr, d)
+
+		if last_pe is not None:
+			check_pkghistory(pkg, pe, pv, pr, lastversion)
+
+		write_latestlink(pkg, pe, pv, pr, d)		
+}
+
+
+def check_pkghistory(pkg, pe, pv, pr, lastversion):
+	import bb
+
+	(last_pe, last_pv, last_pr) = lastversion
+
+	bb.debug(2, "Checking package history")
+	# RDEPENDS removed?
+	# PKG changed?
+	# Each file list of each package for file removals?
+
+
+def write_pkghistory(pkg, pe, pv, pr, d):
+	import bb, os
+	bb.debug(2, "Writing package history")
+
+	pkghistdir = bb.data.getVar('PKGHIST_DIR', d, True)
+
+	verpath = os.path.join(pkghistdir, pkg, pe, pv, pr)
+	if not os.path.exists(verpath):
+		os.makedirs(verpath)
+
+def write_latestlink(pkg, pe, pv, pr, d):
+	import bb, os
+
+	pkghistdir = bb.data.getVar('PKGHIST_DIR', d, True)
+
+	def rm_link(path):
+		try: 
+			os.unlink(path)
+		except OSError:
+			return
+
+	rm_link(os.path.join(pkghistdir, pkg, "latest"))
+	rm_link(os.path.join(pkghistdir, pkg, pe, "latest"))
+	rm_link(os.path.join(pkghistdir, pkg, pe, pv, "latest"))
+
+	os.symlink(os.path.join(pkghistdir, pkg, pe), os.path.join(pkghistdir, pkg, "latest"))
+	os.symlink(os.path.join(pkghistdir, pkg, pe, pv), os.path.join(pkghistdir, pkg, pe, "latest"))
+	os.symlink(os.path.join(pkghistdir, pkg, pe, pv, pr), os.path.join(pkghistdir, pkg, pe, pv, "latest"))
+