Add support for synchronizing ebuild and eclass timestamps with the metadata

cache timestamps which emerge --sync operates on a git repository. This is
necessary since git doesn't preserve timestamps. It is assumed that the
timestamps should be synchronized if the relevant ebuilds and eclasses are
unmodified relative to the HEAD commit (as reported by git-ls-files). This
feature was requested by Daniel Robbins, so that it's possible for the funtoo
git repository to distribute pre-generated metadata. (trunk r12303)

svn path=/main/branches/2.1.6/; revision=12326

1 files changed, 136 insertions, 1 deletions

diff --git a/pym/_emerge/__init__.py b/pym/_emerge/__init__.py
index c85b2f97d..55e895d10 100644
--- a/pym/_emerge/__init__.py
+++ b/pym/_emerge/__init__.py
@@ -11627,6 +11627,7 @@ def action_sync(settings, trees, mtimedb, myopts, myaction):
 	vcs_dirs = vcs_dirs.intersection(os.listdir(myportdir))
 
 	os.umask(0022)
+	dosyncuri = syncuri
 	updatecache_flg = False
 	if myaction == "metadata":
 		print "skipping sync"
@@ -11649,7 +11650,9 @@ def action_sync(settings, trees, mtimedb, myopts, myaction):
 		msg = ">>> Git pull in %s successful" % myportdir
 		emergelog(xterm_titles, msg)
 		writemsg_level(msg + "\n")
-		return exitcode
+		exitcode = git_sync_timestamps(settings, myportdir)
+		if exitcode == os.EX_OK:
+			updatecache_flg = True
 	elif syncuri[:8]=="rsync://":
 		for vcs_dir in vcs_dirs:
 			writemsg_level(("!!! %s appears to be under revision " + \
@@ -12072,6 +12075,138 @@ def action_sync(settings, trees, mtimedb, myopts, myaction):
 	display_news_notification(root_config, myopts)
 	return os.EX_OK
 
+def git_sync_timestamps(settings, portdir):
+	"""
+	Since git doesn't preserve timestamps, synchronize timestamps between
+	entries and ebuilds/eclasses. Assume the cache has the correct timestamp
+	for a given file as long as the file in the working tree is not modified
+	(relative to HEAD).
+	"""
+	cache_dir = os.path.join(portdir, "metadata", "cache")
+	if not os.path.isdir(cache_dir):
+		return os.EX_OK
+	writemsg_level(">>> Synchronizing timestamps...\n")
+
+	from portage.cache.cache_errors import CacheError
+	try:
+		cache_db = settings.load_best_module("portdbapi.metadbmodule")(
+			portdir, "metadata/cache", portage.auxdbkeys[:], readonly=True)
+	except CacheError, e:
+		writemsg_level("!!! Unable to instantiate cache: %s\n" % (e,),
+			level=logging.ERROR, noiselevel=-1)
+		return 1
+
+	ec_dir = os.path.join(portdir, "eclass")
+	try:
+		ec_names = set(f[:-7] for f in os.listdir(ec_dir) \
+			if f.endswith(".eclass"))
+	except OSError, e:
+		writemsg_level("!!! Unable to list eclasses: %s\n" % (e,),
+			level=logging.ERROR, noiselevel=-1)
+		return 1
+
+	args = [portage.const.BASH_BINARY, "-c",
+		"cd %s && git ls-files -m --with-tree=HEAD" % \
+		portage._shell_quote(portdir)]
+	import subprocess
+	proc = subprocess.Popen(args, stdout=subprocess.PIPE)
+	modified_files = set(l.rstrip("\n") for l in proc.stdout)
+	rval = proc.wait()
+	if rval != os.EX_OK:
+		return rval
+
+	modified_eclasses = set(ec for ec in ec_names \
+		if os.path.join("eclass", ec + ".eclass") in modified_files)
+
+	updated_ec_mtimes = {}
+
+	for cpv in cache_db:
+		cpv_split = portage.catpkgsplit(cpv)
+		if cpv_split is None:
+			writemsg_level("!!! Invalid cache entry: %s\n" % (cpv,),
+				level=logging.ERROR, noiselevel=-1)
+			continue
+
+		cat, pn, ver, rev = cpv_split
+		cat, pf = portage.catsplit(cpv)
+		relative_eb_path = os.path.join(cat, pn, pf + ".ebuild")
+		if relative_eb_path in modified_files:
+			continue
+
+		try:
+			cache_entry = cache_db[cpv]
+			eb_mtime = cache_entry.get("_mtime_")
+			ec_mtimes = cache_entry.get("_eclasses_")
+		except KeyError:
+			writemsg_level("!!! Missing cache entry: %s\n" % (cpv,),
+				level=logging.ERROR, noiselevel=-1)
+			continue
+		except CacheError, e:
+			writemsg_level("!!! Unable to access cache entry: %s %s\n" % \
+				(cpv, e), level=logging.ERROR, noiselevel=-1)
+			continue
+
+		if eb_mtime is None:
+			writemsg_level("!!! Missing ebuild mtime: %s\n" % (cpv,),
+				level=logging.ERROR, noiselevel=-1)
+			continue
+
+		try:
+			eb_mtime = long(eb_mtime)
+		except ValueError:
+			writemsg_level("!!! Invalid ebuild mtime: %s %s\n" % \
+				(cpv, eb_mtime), level=logging.ERROR, noiselevel=-1)
+			continue
+
+		if ec_mtimes is None:
+			writemsg_level("!!! Missing eclass mtimes: %s\n" % (cpv,),
+				level=logging.ERROR, noiselevel=-1)
+			continue
+
+		if modified_eclasses.intersection(ec_mtimes):
+			continue
+
+		missing_eclasses = set(ec_mtimes).difference(ec_names)
+		if missing_eclasses:
+			writemsg_level("!!! Non-existent eclass(es): %s %s\n" % \
+				(cpv, sorted(missing_eclasses)), level=logging.ERROR,
+				noiselevel=-1)
+			continue
+
+		eb_path = os.path.join(portdir, relative_eb_path)
+		try:
+			current_eb_mtime = os.stat(eb_path)
+		except OSError:
+			writemsg_level("!!! Missing ebuild: %s\n" % \
+				(cpv,), level=logging.ERROR, noiselevel=-1)
+			continue
+
+		inconsistent = False
+		for ec, (ec_path, ec_mtime) in ec_mtimes.iteritems():
+			updated_mtime = updated_ec_mtimes.get(ec)
+			if updated_mtime is not None and updated_mtime != ec_mtime:
+				writemsg_level("!!! Inconsistend eclass mtime: %s %s\n" % \
+					(cpv, ec), level=logging.ERROR, noiselevel=-1)
+				inconsistent = True
+				break
+
+		if inconsistent:
+			continue
+
+		if current_eb_mtime != eb_mtime:
+			os.utime(eb_path, (eb_mtime, eb_mtime))
+
+		for ec, (ec_path, ec_mtime) in ec_mtimes.iteritems():
+			if ec in updated_ec_mtimes:
+				continue
+			ec_path = os.path.join(ec_dir, ec + ".eclass")
+			current_mtime = long(os.stat(ec_path).st_mtime)
+			if current_mtime != ec_mtime:
+				os.utime(ec_path, (ec_mtime, ec_mtime))
+			updated_ec_mtimes[ec] = ec_mtime
+
+	return os.EX_OK
+
 def action_metadata(settings, portdb, myopts):
 	portage.writemsg_stdout("\n>>> Updating Portage cache:      ")
 	old_umask = os.umask(0002)