From b93b24f9fa1b2761aa0768274bd93ade9b526961 Mon Sep 17 00:00:00 2001
From: Zac Medico <zmedico@gentoo.org>
Date: Sun, 22 Apr 2012 10:56:01 -0700
Subject: Add ${T}/build.log symlink to PORT_LOGDIR.

This will fix bug #412865. This makes it easier on people who
`emerge foo`, do stuff, `emerge foo`, do stuff, etc... to have
the same path to the log in between runs.
---
 bin/isolated-functions.sh                        | 11 +++++++++--
 pym/portage/package/ebuild/prepare_build_dirs.py | 22 ++++++++++++++++++++--
 2 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/bin/isolated-functions.sh b/bin/isolated-functions.sh
index 98be41ec0..36304881f 100644
--- a/bin/isolated-functions.sh
+++ b/bin/isolated-functions.sh
@@ -216,8 +216,15 @@ die() {
 		> "$PORTAGE_BUILDDIR/.die_hooks"
 	fi
 
-	[[ -n ${PORTAGE_LOG_FILE} ]] \
-		&& eerror "The complete build log is located at '${PORTAGE_LOG_FILE}'."
+	if [[ -n ${PORTAGE_LOG_FILE} ]] ; then
+		eerror "The complete build log is located at '${PORTAGE_LOG_FILE}'."
+		if [[ ${PORTAGE_LOG_FILE} != ${T}/* ]] ; then
+			# Display path to symlink in ${T}, as requested in bug #412865.
+			local log_ext=${PORTAGE_LOG_FILE##*/}
+			log_ext=${log_ext#*.}
+			eerror "For convenience, a symlink to the build log is located at '${T}/build.${log_ext}'."
+		fi
+	fi
 	if [ -f "${T}/environment" ] ; then
 		eerror "The ebuild environment file is located at '${T}/environment'."
 	elif [ -d "${T}" ] ; then
diff --git a/pym/portage/package/ebuild/prepare_build_dirs.py b/pym/portage/package/ebuild/prepare_build_dirs.py
index 50b14ec91..b8fbdc5cf 100644
--- a/pym/portage/package/ebuild/prepare_build_dirs.py
+++ b/pym/portage/package/ebuild/prepare_build_dirs.py
@@ -346,13 +346,31 @@ def _prepare_workdir(mysettings):
 				writemsg(_unicode_decode("!!! %s: %s\n") %
 					(_("Permission Denied"), log_subdir), noiselevel=-1)
 
+	tmpdir_log_path = os.path.join(
+		mysettings["T"], "build.log%s" % compress_log_ext)
 	if not logdir_subdir_ok:
 		# NOTE: When sesandbox is enabled, the local SELinux security policies
 		# may not allow output to be piped out of the sesandbox domain. The
 		# current policy will allow it to work when a pty is available, but
 		# not through a normal pipe. See bug #162404.
-		mysettings["PORTAGE_LOG_FILE"] = os.path.join(
-			mysettings["T"], "build.log%s" % compress_log_ext)
+		mysettings["PORTAGE_LOG_FILE"] = tmpdir_log_path
+	else:
+		# Create a symlink from tmpdir_log_path to PORTAGE_LOG_FILE, as
+		# requested in bug #412865.
+		make_new_symlink = False
+		try:
+			target = os.readlink(tmpdir_log_path)
+		except OSError:
+			make_new_symlink = True
+		else:
+			if target != mysettings["PORTAGE_LOG_FILE"]:
+				make_new_symlink = True
+		if make_new_symlink:
+			try:
+				os.unlink(tmpdir_log_path)
+			except OSError:
+				pass
+			os.symlink(mysettings["PORTAGE_LOG_FILE"], tmpdir_log_path)
 
 def _ensure_log_subdirs(logdir, subdir):
 	"""
-- 
cgit v1.2.3-1-g7c22