From 60d88c7c28998ce88fe1f71d73dde228cf94912b Mon Sep 17 00:00:00 2001
From: Dave Woodfall <dave@slackbuilds.org>
Date: Mon, 5 Apr 2021 04:27:18 +0000
Subject: Optimisations with loops when running update.

Use printf's formatting instead of for loops, and tee instead of cp.
Use --fast with gzip.

The biggest slowdowns are the bunzip2s on MANIFEST files, but not much
can be done about those.

The changes together shave roughly 3 seconds off here, but it's all
going to be relative to the local system.
---
 files/core-functions.sh | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/files/core-functions.sh b/files/core-functions.sh
index 1f4faf3..0eedef9 100644
--- a/files/core-functions.sh
+++ b/files/core-functions.sh
@@ -1180,17 +1180,13 @@ Please check your mirror and try again."
 	#
 	echo -e "\tFormatting lists to slackpkg style..."
 	echo -e "\t\tPackage List: using $( basename $FILELIST ) as source"
-	grep "\.t[blxg]z$" $FILELIST| \
-		awk -f /usr/libexec/slackpkg/pkglist.awk |\
-		sed -e 's/^M//g' > ${TMPDIR}/pkglist
-	cp ${TMPDIR}/pkglist ${WORKDIR}/pkglist
+	grep "\.t[blxg]z$" $FILELIST |
+		awk -f /usr/libexec/slackpkg/pkglist.awk |
+		sed -e 's/^M//g' | tee ${WORKDIR}/pkglist > ${TMPDIR}/pkglist
 
 	# Create the slackware tree under TEMP directory
-	for i in $( cut -f7 -d\  ${WORKDIR}/pkglist | sort -u ) ; do
-	  if ! [ -d ${ROOT}/${TEMP}/${i} ]; then
-	    mkdir -p ${ROOT}/${TEMP}/${i}
-	  fi
-	done
+	mkdir -p $( printf "${ROOT}/${TEMP}/%s " $(
+		cut -f7 -d\  ${WORKDIR}/pkglist | sort -u ) )
 
 	# Format MANIFEST
 	#
@@ -1199,8 +1195,9 @@ Please check your mirror and try again."
 	#
 	MANFILES=""
 	for i in $DIRS; do
-		bunzip2 -c $TMPDIR/${i}-MANIFEST.bz2 | awk -f /usr/libexec/slackpkg/filelist.awk | \
-			gzip > ${TMPDIR}/${i}-filelist.gz
+		bunzip2 -c $TMPDIR/${i}-MANIFEST.bz2 |
+			awk -f /usr/libexec/slackpkg/filelist.awk |
+			gzip --fast > ${TMPDIR}/${i}-filelist.gz
 	done
 	cp ${TMPDIR}/*-filelist.gz ${WORKDIR}/
 
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