packaging: make packaging scripts less reliant on pwd

The scripts currently assume they are executed from the repo root.
This feels like an arbitrary restriction. Let's fix that.

Differential Revision: https://phab.mercurial-scm.org/D3551

contrib/packaging/builddeb

@@ -1,104 +1,106 b''
 #!/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
 
+ROOTDIR=$(cd $(dirname $0)/../.. > /dev/null; pwd)
+
 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`
 DEBFLAGS=-b
 while [ "$1" ]; do
     case "$1" in
     --distid )
         shift
         DISTID="$1"
         shift
         ;;
     --codename )
         shift
         CODENAME="$1"
         shift
         ;;
     --cleanup )
         shift
         BUILD=
         ;;
     --build )
         shift
         CLEANUP=
         ;;
     --source-only )
         shift
         DEBFLAGS=-S
         ;;
     * )
         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+$distance-$CODENAME-$node"
 elif [ "$DEBFLAGS" = "-S" ] ; then
     # for building a ppa (--source-only) for a release (distance == 0), we need
     # to version the distroseries so that we can upload to launchpad
     debver="$debver~${CODENAME}1"
 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 "$PWD"/contrib/packaging/debian debian
+    cp -r "$ROOTDIR"/contrib/packaging/debian debian
 
     sed -i.tmp "s/__VERSION__/$debver/" $changelog
     sed -i.tmp "s/__DATE__/$(date --rfc-2822)/" $changelog
     sed -i.tmp "s/__CODENAME__/$CODENAME/" $changelog
     rm $changelog.tmp
 
     # remove the node from the version string
     SRCFILE="mercurial_$(echo $debver | sed "s,-$node,,").orig.tar.gz"
-    "$PWD/hg" archive $SRCFILE
+    "$ROOTDIR/hg" archive $SRCFILE
     mv $SRCFILE ..
     debuild -us -uc -i -I $DEBFLAGS
     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 \
           ../mercurial*.dsc ../mercurial*.gz \
           -type f -newer $control -print0 2>/dev/null | \
       xargs -Inarf -0 mv narf "$OUTPUTDIR"
     echo "Built packages for $debver:"
     find "$OUTPUTDIR" -type f -newer $control -name '*.deb'
 fi

contrib/packaging/dockerdeb

@@ -1,35 +1,35 b''
 #!/bin/bash -eu
 
 . $(dirname $0)/dockerlib.sh
 . $(dirname $0)/packagelib.sh
 
 BUILDDIR=$(dirname $0)
 export ROOTDIR=$(cd $BUILDDIR/../.. > /dev/null; pwd)
 
 checkdocker
 
 DISTID="$1"
 CODENAME="$2"
 PLATFORM="$1-$2"
 shift; shift # extra params are passed to build process
 
 OUTPUTDIR=${OUTPUTDIR:=$ROOTDIR/packages/$PLATFORM}
 
 initcontainer $PLATFORM
 
 # debuild only appears to be able to save built debs etc to .., so we
 # have to share the .. of the current directory with the docker
 # container and hope it's writable. Whee.
-dn=$(basename $PWD)
+dn=$(basename $ROOTDIR)
 
 if [ $(uname) = "Darwin" ] ; then
     $DOCKER run -u $DBUILDUSER --rm -v $PWD/..:/mnt $CONTAINER \
             sh -c "cd /mnt/$dn && make clean && make local"
 fi
-$DOCKER run -u $DBUILDUSER --rm -v $PWD/..:/mnt $CONTAINER \
+$DOCKER run -u $DBUILDUSER --rm -v $ROOTDIR/..:/mnt $CONTAINER \
   sh -c "cd /mnt/$dn && DEB_BUILD_OPTIONS='${DEB_BUILD_OPTIONS:=}' contrib/packaging/builddeb --build --distid $DISTID --codename $CODENAME $@"
 contrib/packaging/builddeb --cleanup --distid $DISTID --codename $CODENAME
 if [ $(uname) = "Darwin" ] ; then
     $DOCKER run -u $DBUILDUSER --rm -v $PWD/..:/mnt $CONTAINER \
             sh -c "cd /mnt/$dn && make clean"
 fi

contrib/packaging/dockerrpm

@@ -1,37 +1,37 b''
 #!/bin/bash -e
 
 . $(dirname $0)/dockerlib.sh
 
 BUILDDIR=$(dirname $0)
 export ROOTDIR=$(cd $BUILDDIR/../..; pwd)
 
 checkdocker
 
 PLATFORM="$1"
 shift # extra params are passed to buildrpm
 
 initcontainer $PLATFORM
 
 RPMBUILDDIR=$ROOTDIR/packages/$PLATFORM
-contrib/packaging/buildrpm --rpmbuilddir $RPMBUILDDIR --prepare $*
+$ROOTDIR/contrib/packaging/buildrpm --rpmbuilddir $RPMBUILDDIR --prepare $*
 
 DSHARED=/mnt/shared
 $DOCKER run -e http_proxy -e https_proxy -u $DBUILDUSER --rm -v $RPMBUILDDIR:$DSHARED $CONTAINER \
     rpmbuild --define "_topdir $DSHARED" -ba $DSHARED/SPECS/mercurial.spec --clean
 
 $DOCKER run -e http_proxy -e https_proxy -u $DBUILDUSER --rm -v $RPMBUILDDIR:$DSHARED $CONTAINER \
     createrepo $DSHARED
 
 cat << EOF > $RPMBUILDDIR/mercurial.repo
 # Place this file in /etc/yum.repos.d/mercurial.repo
 [mercurial]
 name=Mercurial packages for $PLATFORM
 # baseurl=file://$RPMBUILDDIR/
 baseurl=http://hg.example.com/build/$PLATFORM/
 skip_if_unavailable=True
 gpgcheck=0
 enabled=1
 EOF
 
 echo
 echo "Build complete - results can be found in $RPMBUILDDIR"