debian: switch to using debhelper and dh_python2 to build debs

This is a much larger commit than I'd like, but I honestly don't see a
good way to break it up and leave things working. Summary:

We now use debian/rules with debhelper to build our debs. This is much
more standard, and means we use dh_python2 to do things like handle
leaving .pyc files out of the built debs.

The resulting package is split into mercurial and mercurial-common,
with the former being the hg stub and all the native .sos, and the
latter being basically everything else.

builddeb and dockerdeb are updated to use the new system. The old way
(using dpkg by hand) breaks with the above changes because
debian/control no longer contains a version string (that's now guessed
from the phony changelog.)

Tests are updated to assert that the right files end up in the right
debs.

contrib/debian/changelog

@@ -0,0 +1,5 b''
+mercurial (__VERSION__) unstable; urgency=medium
+
+  * Automated build performed by upstream.
+
+ -- Mercurial Devel <[e-mail]>  __DATE__

contrib/debian/compat

@@ -0,0 +1,1 b''
+9

contrib/debian/copyright

@@ -0,0 +1,27 b''
+Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: mercurial
+Source: http://www.selenic.com/mercurial/
+
+Files: *
+Copyright: 2005-2015, Matt Mackall <[e-mail]> and others.
+License: GPL-2+
+ This program is free software; you can redistribute it
+ and/or modify it under the terms of the GNU General Public
+ License as published by the Free Software Foundation; either
+ version 2 of the License, or (at your option) any later
+ version.
+ .
+ This program is distributed in the hope that it will be
+ useful, but WITHOUT ANY WARRANTY; without even the implied
+ warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ PURPOSE.  See the GNU General Public License for more
+ details.
+ .
+ You should have received a copy of the GNU General Public
+ License along with this package; if not, write to the Free
+ Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ Boston, MA  02110-1301 USA
+ .
+ On Debian systems, the full text of the GNU General Public
+ License version 2 can be found in the file
+ `/usr/share/common-licenses/GPL-2'.

contrib/debian/rules

@@ -0,0 +1,29 b''
+#!/usr/bin/make -f
+# Uncomment this to turn on verbose mode.
+# export DH_VERBOSE=1
+
+CPUS=$(shell cat /proc/cpuinfo | grep -E ^processor | wc -l)
+
+%:
+	dh $@ --with python2
+
+override_dh_auto_test:
+	http_proxy='' dh_auto_test -- TESTFLAGS="-j$(CPUS)"
+
+override_dh_python2:
+	dh_python2
+	find debian/mercurial/usr/share -type d -empty -delete
+
+override_dh_install:
+	python$(PYVERS) setup.py install --root $(CURDIR)/debian/mercurial --install-layout=deb
+	# remove arch-independent python stuff
+	find $(CURDIR)/debian/mercurial/usr/lib \
+		! -name '*.so' ! -type d -delete , \
+		-type d -empty -delete
+	python$(PYVERS) setup.py install --root $(CURDIR)/debian/mercurial-common --install-layout=deb
+	make install-doc PREFIX=$(CURDIR)/debian/mercurial-common/usr
+	# remove arch-dependent python stuff
+	find $(CURDIR)/debian/mercurial-common/usr/lib \
+		-name '*.so' ! -type d -delete , \
+		-type d -empty -delete
+	rm $(CURDIR)/debian/mercurial-common/usr/bin/hg

contrib/builddeb

@@ -7,6 +7,7 b''
 . $(dirname $0)/packagelib.sh
 
 BUILD=1
+CLEANUP=1
 DEBVERSION=jessie
 while [ "$1" ]; do
     case "$1" in
@@ -15,10 +16,14 b' while [ "$1" ]; do'
         DEBVERSION="$1"
         shift
         ;;
-    --prepare )
+    --cleanup )
         shift
         BUILD=
         ;;
+    --build )
+        shift
+        CLEANUP=
+        ;;
     --debbuilddir )
         shift
         DEBBUILDDIR="$1"
@@ -31,13 +36,10 b' while [ "$1" ]; do'
     esac
 done
 
-DEBBUILDDIR=${OUTPUTDIR:="$PWD/debbuild"}
+trap "if [ '$CLEANUP' ] ; then rm -r '$PWD/debian' ; fi" EXIT
 
 set -u
 
-rm -rf $DEBBUILDDIR
-mkdir -p $DEBBUILDDIR
-
 if [ ! -d .hg ]; then
     echo 'You are not inside a Mercurial repository!' 1>&2
     exit 1
@@ -45,26 +47,38 b' fi'
 
 gethgversion
 
-cp -r $PWD/contrib/debian $DEBBUILDDIR/DEBIAN
-chmod -R 0755 $DEBBUILDDIR/DEBIAN
+control=debian/control
+changelog=debian/changelog
 
-control=$DEBBUILDDIR/DEBIAN/control
+if [ "$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__/$version/" < $control > $control.tmp
-mv $control.tmp $control
+    sed "s/__VERSION__/$version/" < $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
 
-if [ "$BUILD" ]; then
-    make PREFIX=$DEBBUILDDIR/usr install
-    dpkg-deb --build $DEBBUILDDIR
-    mv $DEBBUILDDIR.deb $DEBBUILDDIR/mercurial-$version-$release.deb
-    if [ $? = 0 ]; then
+fi
+if [ "$CLEANUP" ] ; then
         echo
+    OUTPUTDIR=${OUTPUTDIR:=packages/debian-$DEBVERSION}
+    find ../mercurial*.deb ../mercurial_*.build ../mercurial_*.changes \
+          -type f -newer $control -print0 | \
+      xargs -Inarf -0 mv narf "$OUTPUTDIR"
         echo "Built packages for $version-$release:"
-        find $DEBBUILDDIR/ -type f -newer $control
+    find "$OUTPUTDIR" -type f -newer $control -name '*.deb'
     fi
-else
-    echo "Prepared sources for $version-$release $control are in $DEBBUILDDIR - use like:"
-    echo "dpkg-deb --build $DEBBUILDDIR"
-fi

contrib/debian/control

@@ -1,9 +1,47 b''
-Package: mercurial
-Version: __VERSION__
+Source: mercurial
 Section: vcs
 Priority: optional
+Maintainer: Mercurial Developers <[e-mail]>
+Build-Depends:
+ debhelper (>= 7),
+ dh-python,
+ python-all
+Standards-Version: 3.9.4
+X-Python-Version: >= 2.6
+
+Package: mercurial
+Depends:
+ python,
+ ${shlibs:Depends},
+ ${misc:Depends},
+ ${python:Depends},
+ mercurial-common (= ${source:Version})
+Architecture: any
+Description: fast, easy to use, distributed revision control tool.
+ Mercurial is a fast, lightweight Source Control Management system designed
+ for efficient handling of very large distributed projects.
+ .
+ Its features include:
+  * O(1) delta-compressed file storage and retrieval scheme
+  * Complete cross-indexing of files and changesets for efficient exploration
+    of project history
+  * Robust SHA1-based integrity checking and append-only storage model
+  * Decentralized development model with arbitrary merging between trees
+  * Easy-to-use command-line interface
+  * Integrated stand-alone web interface
+  * Small Python codebase
+
+Package: mercurial-common
 Architecture: all
-Depends: python
-Conflicts: mercurial-common
-Maintainer: Mercurial Developers <[e-mail]>
-Description: Mercurial (probably nightly) package built by upstream.
+Depends:
+ ${misc:Depends},
+ ${python:Depends},
+Recommends: mercurial (= ${source:Version}), ca-certificates
+Breaks: mercurial (<< ${source:Version})
+Replaces: mercurial (<< 2.6.3)
+Description: easy-to-use, scalable distributed version control system (common files)
+ Mercurial is a fast, lightweight Source Control Management system designed
+ for efficient handling of very large distributed projects.
+ .
+ This package contains the architecture independent components of Mercurial,
+ and is generally useless without the mercurial package.

contrib/dockerdeb

@@ -12,29 +12,23 b' DEBPLATFORM="$1"'
 PLATFORM="debian-$1"
 shift # extra params are passed to build process
 
+OUTPUTDIR=${OUTPUTDIR:=$ROOTDIR/packages/$PLATFORM}
+
 initcontainer $PLATFORM
 
-DEBBUILDDIR=${OUTPUTDIR:=$ROOTDIR/packages/$PLATFORM}
-OUTPUTDIR=$DEBBUILDDIR/staged contrib/builddeb --release $DEBPLATFORM --prepare
+# debuild only appears to be able to save built debs etc to .., so we
+# have to share the .. of the current directory with the docker
+# container and hope it's writable. Whee.
+dn=$(basename $PWD)
 
-DSHARED=/mnt/shared/
 if [ $(uname) = "Darwin" ] ; then
-    $DOCKER run -u $DBUILDUSER --rm -v $DEBBUILDDIR:$DSHARED -v $PWD:/mnt/hg $CONTAINER \
-            sh -c "cd /mnt/hg && make clean && make local"
+    $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 $DEBBUILDDIR:$DSHARED -v $PWD:/mnt/hg $CONTAINER \
-  sh -c "cd /mnt/hg && make PREFIX=$DSHARED/staged/usr install"
-$DOCKER run -u $DBUILDUSER --rm -v $DEBBUILDDIR:$DSHARED $CONTAINER \
-  dpkg-deb --build $DSHARED/staged
+$DOCKER run -u $DBUILDUSER --rm -v $PWD/..:/mnt $CONTAINER \
+  sh -c "cd /mnt/$dn && DEB_BUILD_OPTIONS='${DEB_BUILD_OPTIONS:=}' contrib/builddeb --build --release $DEBPLATFORM"
+contrib/builddeb --cleanup --release $DEBPLATFORM
 if [ $(uname) = "Darwin" ] ; then
-    $DOCKER run -u $DBUILDUSER --rm -v $DEBBUILDDIR:$DSHARED -v $PWD:/mnt/hg $CONTAINER \
-            sh -c "cd /mnt/hg && make clean"
+    $DOCKER run -u $DBUILDUSER --rm -v $PWD/..:/mnt $CONTAINER \
+            sh -c "cd /mnt/$dn && make clean"
 fi
-
-gethgversion
-
-rm -r $DEBBUILDDIR/staged
-mv $DEBBUILDDIR/staged.deb $DEBBUILDDIR/mercurial-$version-$release.deb
-
-echo
-echo "Build complete - results can be found in $DEBBUILDDIR"

tests/test-debian-packages.t

@@ -1,4 +1,8 b''
 #require test-repo slow debhelper
+
+Ensure debuild doesn't run the testsuite, as that could get silly.
+  $ DEB_BUILD_OPTIONS=nocheck
+  $ export DEB_BUILD_OPTIONS
   $ OUTPUTDIR=`pwd`
   $ export OUTPUTDIR
 
@@ -6,8 +10,11 b''
   $ make deb > $OUTPUTDIR/build.log 2>&1
   $ cd $OUTPUTDIR
   $ ls *.deb
-  mercurial-*.deb (glob)
-  $ dpkg --contents mercurial*.deb | grep localrepo
-  * ./usr/lib/python2.7/site-packages/mercurial/localrepo.py (glob)
-  * ./usr/lib/python2.7/site-packages/mercurial/localrepo.pyc (glob)
-  $ rm -f *.deb build.log
+  mercurial-common_*.deb (glob)
+  mercurial_*.deb (glob)
+main deb should have .so but no .py
+  $ dpkg --contents mercurial_*.deb | egrep '(localrepo|parsers)'
+  * ./usr/lib/python2.7/dist-packages/mercurial/parsers*.so (glob)
+mercurial-common should have py but no .so or pyc
+  $ dpkg --contents mercurial-common_*.deb | egrep '(localrepo|parsers)'
+  * ./usr/lib/python2.7/dist-packages/mercurial/localrepo.py (glob)

tests/test-docker-packaging.t

@@ -1,5 +1,8 b''
 #require test-repo slow docker
 
+Ensure debuild doesn't run the testsuite, as that could get silly.
+  $ DEB_BUILD_OPTIONS=nocheck
+  $ export DEB_BUILD_OPTIONS
   $ OUTPUTDIR=`pwd`
   $ export OUTPUTDIR
 
@@ -7,13 +10,18 b''
   $ make docker-debian-jessie > $OUTPUTDIR/build.log 2>&1
   $ cd $OUTPUTDIR
   $ ls *.deb
-  mercurial-*.deb (glob)
+  mercurial-common_*.deb (glob)
+  mercurial_*.deb (glob)
 
 We check debian package contents with portable tools so that when
 we're on non-debian machines we can still test the packages that are
 built using docker.
-  $ ar x mercurial*.deb
-  $ tar tf data.tar* | grep localrepo | sort
-  ./usr/lib/python2.7/site-packages/mercurial/localrepo.py
-  ./usr/lib/python2.7/site-packages/mercurial/localrepo.pyc
-  $ rm -f *.deb build.log
+
+main deb should have .so but no .py
+  $ ar x mercurial_*.deb
+  $ tar tf data.tar* | egrep '(localrepo|parsers)'
+  ./usr/lib/python2.7/dist-packages/mercurial/parsers*.so (glob)
+mercurial-common should have .py but no .so or .pyc
+  $ ar x mercurial-common_*.deb
+  $ tar tf data.tar* | egrep '(localrepo|parsers)'
+  ./usr/lib/python2.7/dist-packages/mercurial/localrepo.py