From: Michael Tremer <michael.tremer@ipfire.org>
Date: Tue, 10 Mar 2020 13:26:04 +0000 (+0000)
Subject: cdrom: Do not write the temporary tarball to disk
X-Git-Tag: v2.25-core143~123
X-Git-Url: http://git.ipfire.org/?p=ipfire-2.x.git;a=commitdiff_plain;h=cd8ee3021c8858a5d11f49b049e6f83ff846b3b3

cdrom: Do not write the temporary tarball to disk

In order to remove any duplicate files in the tarball, we
have to unpack it again. The whole filesystem is written
to disk twice which is unnecessary.

This patch removes that temporary step and reduces IO
during the build.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>
---

diff --git a/lfs/cdrom b/lfs/cdrom
index b26db754bd..836cae9816 100644
--- a/lfs/cdrom
+++ b/lfs/cdrom
@@ -29,6 +29,9 @@ VER = ipfire
 THISAPP    = cdrom
 TARGET     = $(DIR_INFO)/$(THISAPP)
 
+# Fail when there is an error in the tar pipe
+SHELL=/bin/bash -o pipefail
+
 ifeq "$(BUILD_PLATFORM)" "arm"
 	TAR_OPTIONS =
 else
@@ -147,7 +150,7 @@ $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
 	# since stage2 has been executed..
 	echo "$(SYSTEM_RELEASE)" > /etc/system-release
 
-	rm -rf /install/cdrom /tmp/*
+	rm -rf /install/cdrom
 	mkdir -p /install/cdrom/doc
 
 	# Clear mtab (prevents .journal problems)
@@ -158,18 +161,18 @@ $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
 	BUILDTARGET="$(BUILDTARGET)" BUILD_ARCH="$(BUILD_ARCH)" KVER="$(KVER)" \
 		$(DIR_SRC)/src/scripts/archive.files \
 		$(DIR_SRC)/config/rootfiles/common \
-		> /tmp/ROOTFILES
+		> $(DIR_TMP)/ROOTFILES
 
 	# Compress root filesystem
 	# Reason for this tar+untar+tar is removing of entries listed two or more in src/ROOTFILES
-	tar -c --exclude='#*' --exclude='proc/*' --exclude='dev/pts/*' \
-		--exclude='__pycache__' --exclude='tmp/ROOTFILES' \
-		-C / --files-from=/tmp/ROOTFILES -f /$(SNAME).tar
-	rm -f /tmp/ROOTFILES
-	tar -x -C /tmp -f /$(SNAME).tar
-	rm -f /$(SNAME).tar
-	@mkdir /tmp/sys
-	cd /tmp && tar cf - * | xz $(XZ_OPT) > /install/cdrom/distro.img && rm -rf *
+	rm -rf $(DIR_TMP)/root && mkdir -p $(DIR_TMP)/root
+	tar -c --exclude='#*' --exclude='proc/*' --exclude='dev/pts/*' --exclude='tmp/*' \
+		--exclude='__pycache__' \
+		-C / --files-from=$(DIR_TMP)/ROOTFILES | tar -x -C $(DIR_TMP)/root
+	rm -f $(DIR_TMP)/ROOTFILES
+	mkdir $(DIR_TMP)/root/sys
+	cd $(DIR_TMP)/root && tar cf - * | xz $(XZ_OPT) > /install/cdrom/distro.img
+	rm -rf $(DIR_TMP)/root
 
 	# Other files
 	touch /install/cdrom/$(SNAME)-$(VERSION)-core$(CORE).media