From ae9b6cb513c7b29376caecf3b4e52aac452e2b93 Mon Sep 17 00:00:00 2001
From: Zac Medico <zmedico@gentoo.org>
Date: Sun, 28 Aug 2011 16:29:49 -0700
Subject: doebuild: avoid redundant distfiles checks

When the unpack phase is already marked as complete, it's wasteful to
check distfiles digests. In order to avoid this, we have to migrate the
distfiles/workdir timestamp comparisons from ebuild.sh to doebuild.py,
so that doebuild always knows when unpack will be triggered. This also
allows us to eliminate code in dyn_unpack that duplicated dyn_clean,
actually call dyn_clean instead.
---
 bin/ebuild.sh                          | 37 ++----------------
 pym/portage/package/ebuild/doebuild.py | 70 +++++++++++++++++++++++++++++++++-
 2 files changed, 71 insertions(+), 36 deletions(-)

diff --git a/bin/ebuild.sh b/bin/ebuild.sh
index d68e54b7b..23a12401d 100755
--- a/bin/ebuild.sh
+++ b/bin/ebuild.sh
@@ -726,41 +726,10 @@ dyn_setup() {
 }
 
 dyn_unpack() {
-	local newstuff="no"
-	if [ -e "${WORKDIR}" ]; then
-		local x
-		local checkme
-		for x in $A ; do
-			vecho ">>> Checking ${x}'s mtime..."
-			if [ "${PORTAGE_ACTUAL_DISTDIR:-${DISTDIR}}/${x}" -nt "${WORKDIR}" ]; then
-				vecho ">>> ${x} has been updated; recreating WORKDIR..."
-				newstuff="yes"
-				break
-			fi
-		done
-		if [ ! -f "${PORTAGE_BUILDDIR}/.unpacked" ] ; then
-			vecho ">>> Not marked as unpacked; recreating WORKDIR..."
-			newstuff="yes"
-		fi
-	fi
-	if [ "${newstuff}" == "yes" ]; then
-		# We don't necessarily have privileges to do a full dyn_clean here.
-		rm -rf "${PORTAGE_BUILDDIR}"/{.setuped,.unpacked,.prepared,.configured,.compiled,.tested,.installed,.packaged,build-info}
-		if ! has keepwork $FEATURES ; then
-			rm -rf "${WORKDIR}"
-		fi
-		if [ -d "${T}" ] && \
-			! has keeptemp $FEATURES ; then
-			rm -rf "${T}" && mkdir "${T}"
-		fi
-	fi
-	if [ -e "${WORKDIR}" ]; then
-		if [ "$newstuff" == "no" ]; then
-			vecho ">>> WORKDIR is up-to-date, keeping..."
-			return 0
-		fi
+	if [[ -f ${PORTAGE_BUILDDIR}/.unpacked ]] ; then
+		vecho ">>> WORKDIR is up-to-date, keeping..."
+		return 0
 	fi
-
 	if [ ! -d "${WORKDIR}" ]; then
 		install -m${PORTAGE_WORKDIR_MODE:-0700} -d "${WORKDIR}" || die "Failed to create dir '${WORKDIR}'"
 	fi
diff --git a/pym/portage/package/ebuild/doebuild.py b/pym/portage/package/ebuild/doebuild.py
index c252e86a3..a95a418b2 100644
--- a/pym/portage/package/ebuild/doebuild.py
+++ b/pym/portage/package/ebuild/doebuild.py
@@ -432,6 +432,7 @@ def doebuild(myebuild, mydo, myroot, mysettings, debug=0, listonly=0,
 	"install":["test"],
 	"rpm":    ["install"],
 	"package":["install"],
+	"merge"  :["install"],
 	}
 	
 	if mydbapi is None:
@@ -666,6 +667,68 @@ def doebuild(myebuild, mydo, myroot, mysettings, debug=0, listonly=0,
 			return unmerge(mysettings["CATEGORY"],
 				mysettings["PF"], myroot, mysettings, vartree=vartree)
 
+		phases_to_run = set()
+		if "noauto" in mysettings.features or \
+			mydo not in actionmap_deps:
+			phases_to_run.add(mydo)
+		else:
+			phase_stack = [mydo]
+			while phase_stack:
+				x = phase_stack.pop()
+				if x in phases_to_run:
+					continue
+				phases_to_run.add(x)
+				phase_stack.extend(actionmap_deps.get(x, []))
+			del phase_stack
+
+		alist = set(mysettings.configdict["pkg"].get("A", "").split())
+
+		unpacked = False
+		if "unpack" in phases_to_run:
+			try:
+				workdir_st = os.stat(mysettings["WORKDIR"])
+			except OSError:
+				pass
+			else:
+				newstuff = False
+				if not os.path.exists(os.path.join(
+					mysettings["PORTAGE_BUILDDIR"], ".unpacked")):
+					writemsg_stdout(
+						">>> Not marked as unpacked; recreating WORKDIR...\n")
+					newstuff = True
+				else:
+					for x in alist:
+						writemsg_stdout(">>> Checking %s's mtime...\n" % x)
+						try:
+							x_st = os.stat(os.path.join(
+								mysettings["DISTDIR"], x))
+						except OSError:
+							# file not fetched yet
+							x_st = None
+
+						if x_st is None or x_st.st_mtime > workdir_st.st_mtime:
+							writemsg_stdout(">>> Timestamp of "
+								"%s has changed; recreating WORKDIR...\n" % x)
+							newstuff = True
+							break
+
+				if newstuff:
+					if builddir_lock is None and \
+						'PORTAGE_BUILDIR_LOCKED' not in mysettings:
+						builddir_lock = EbuildBuildDir(
+							scheduler=PollScheduler().sched_iface,
+							settings=mysettings)
+						builddir_lock.lock()
+					try:
+						_spawn_phase("clean", mysettings)
+					finally:
+						if builddir_lock is not None:
+							builddir_lock.unlock()
+							builddir_lock = None
+				else:
+					writemsg_stdout(">>> WORKDIR is up-to-date, keeping...\n")
+					unpacked = True
+
 		# Build directory creation isn't required for any of these.
 		# In the fetch phase, the directory is needed only for RESTRICT=fetch
 		# in order to satisfy the sane $PWD requirement (from bug #239560)
@@ -739,10 +802,9 @@ def doebuild(myebuild, mydo, myroot, mysettings, debug=0, listonly=0,
 		# Only try and fetch the files if we are going to need them ...
 		# otherwise, if user has FEATURES=noauto and they run `ebuild clean
 		# unpack compile install`, we will try and fetch 4 times :/
-		need_distfiles = tree == "porttree" and \
+		need_distfiles = tree == "porttree" and not unpacked and \
 			(mydo in ("fetch", "unpack") or \
 			mydo not in ("digest", "manifest") and "noauto" not in features)
-		alist = set(mysettings.configdict["pkg"].get("A", "").split())
 		if need_distfiles:
 
 			src_uri, = mydbapi.aux_get(mysettings.mycpv,
@@ -787,6 +849,10 @@ def doebuild(myebuild, mydo, myroot, mysettings, debug=0, listonly=0,
 			# Files are already checked inside fetch(),
 			# so do not check them again.
 			checkme = []
+		elif unpacked:
+			# The unpack phase is marked as complete, so it
+			# would be wasteful to check distfiles again.
+			checkme = []
 		else:
 			checkme = alist
 
-- 
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