contrib/builddeb

import-checker: establish modern import convention

We introduce a new convention for declaring imports and enforce it via
the import checker script.

The new convention is only active when absolute imports are used, which is
currently nowhere. Keying off "from __future__ import absolute_import" to
engage the new import convention seems like the easiest solution. It is
also beneficial for Mercurial to use this mode because it means less work
and ambiguity for the importer and potentially better performance due to
fewer stat() system calls because the importer won't look for modules in
relative paths unless explicitly asked.

Once all files are converted to use absolute import, we can refactor
this code to again only have a single import convention and we can
require use of absolute import in the style checker.

The rules for the new convention are documented in the docstring of the
added function. Tests have been added to test-module-imports.t. Some
tests are sensitive to newlines and source column position, which makes
docstring testing difficult and/or impossible.

#!/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
DEBBUILDDIR="$PWD/debbuild"
while [ "$1" ]; do
    case "$1" in
    --prepare )
        shift
        BUILD=
        ;;
    --debbuilddir )
        shift
        DEBBUILDDIR="$1"
        shift
        ;;
    * )
        echo "Invalid parameter $1!" 1>&2
        exit 1
        ;;
    esac
done

set -u

rm -rf $DEBBUILDDIR
mkdir -p $DEBBUILDDIR

if [ ! -d .hg ]; then
    echo 'You are not inside a Mercurial repository!' 1>&2
    exit 1
fi

gethgversion

cp -r $PWD/contrib/debian $DEBBUILDDIR/DEBIAN
chmod -R 0755 $DEBBUILDDIR/DEBIAN

control=$DEBBUILDDIR/DEBIAN/control

# 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__/$version/" < $control > $control.tmp
mv $control.tmp $control

if [ "$BUILD" ]; then
    dpkg-deb --build $DEBBUILDDIR
    mv $DEBBUILDDIR.deb $DEBBUILDDIR/mercurial-$version-$release.deb
    if [ $? = 0 ]; then
        echo
        echo "Built packages for $version-$release:"
        find $DEBBUILDDIR/ -type f -newer $control
    fi
else
    echo "Prepared sources for $version-$release $control are in $DEBBUILDDIR - use like:"
    echo "dpkg-deb --build $DEBBUILDDIR"
fi