Mercurial > hg
view contrib/builddeb @ 27475:a2e2a8fa5fd1
revlog: avoid string slice when decompressing u* chunks
Revlog chunks can be stored uncompressed. If the first byte of the
raw data is \0, we store the data as is. Else we prefix it with 'u'.
Before, we performed a string slice to strip out the 'u' prefix.
With this patch, we use a buffer to avoid an extra memory copy and
associated garbage collection overhead.
I was unable to verify any performance impact of this patch. For both
mozilla-central and the hg repos, the number of manifest revisions
with 'u' prefixes is very small - under 1%. So this change likely
isn't called enough to have an impact on manifest reading. However,
the reasoning behind this change is solid, so it should be safe.
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Sun, 20 Dec 2015 16:00:27 -0800 |
parents | ef9301ce6046 |
children | 4f1dac94b53f |
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#!/bin/sh -e # # Build a Mercurial debian package from the current repo # # Tested on Jessie (stable as of original script authoring.) . $(dirname $0)/packagelib.sh BUILD=1 CLEANUP=1 DISTID=`(lsb_release -is 2> /dev/null | tr '[:upper:]' '[:lower:]') || echo debian` CODENAME=`lsb_release -cs 2> /dev/null || echo unknown` while [ "$1" ]; do case "$1" in --distid ) shift DISTID="$1" shift ;; --codename ) shift CODENAME="$1" shift ;; --cleanup ) shift BUILD= ;; --build ) shift CLEANUP= ;; * ) echo "Invalid parameter $1!" 1>&2 exit 1 ;; esac done trap "if [ '$CLEANUP' ] ; then rm -r '$PWD/debian' ; fi" EXIT set -u if [ ! -d .hg ]; then echo 'You are not inside a Mercurial repository!' 1>&2 exit 1 fi gethgversion debver="$version" if [ -n "$type" ] ; then debver="$debver~$type" fi if [ -n "$distance" ] ; then debver="$debver+$distance-$node" fi control=debian/control changelog=debian/changelog if [ "$BUILD" ]; then if [ -d debian ] ; then echo "Error! debian control directory already exists!" exit 1 fi cp -r $PWD/contrib/debian debian chmod -R 0755 debian # This looks like sed -i, but sed -i behaves just differently enough # between BSD and GNU sed that I gave up and did the dumb thing. sed "s/__VERSION__/$debver/" < $changelog > $changelog.tmp date=$(date --rfc-2822) sed "s/__DATE__/$date/" < $changelog.tmp > $changelog rm $changelog.tmp debuild -us -uc -b if [ $? != 0 ]; then echo 'debuild failed!' exit 1 fi fi if [ "$CLEANUP" ] ; then echo OUTPUTDIR=${OUTPUTDIR:=packages/$DISTID-$CODENAME} mkdir -p "$OUTPUTDIR" find ../mercurial*.deb ../mercurial_*.build ../mercurial_*.changes \ -type f -newer $control -print0 | \ xargs -Inarf -0 mv narf "$OUTPUTDIR" echo "Built packages for $debver:" find "$OUTPUTDIR" -type f -newer $control -name '*.deb' fi