Finally add precise/12.04 as a build-deb target

Ubuntu Precise has a number of warts that made it non-trivial to add initially, but I've managed to work through some of them and come up with a working build.  Two important parts to note are that it has neither the `btrfs` nor the `devicemapper` graphdriver backends since `btrfs-tools` and `libdevmapper-dev` in the precise repositories are too ancient for them to even compile.

Signed-off-by: Andrew "Tianon" Page <admwiggin@gmail.com>

contrib/builder/deb/generate.sh

@@ -41,6 +41,8 @@ for version in "${versions[@]}"; do
 
 	echo >> "$version/Dockerfile"
 
+	extraBuildTags=
+
 	# this list is sorted alphabetically; please keep it that way
 	packages=(
 		bash-completion # for bash-completion debhelper integration
@@ -54,6 +56,23 @@ for version in "${versions[@]}"; do
 		libdevmapper-dev # for "libdevmapper.h"
 		libsqlite3-dev # for "sqlite3.h"
 	)
+
+	if [ "$suite" = 'precise' ]; then
+		# precise has a few package issues
+
+		# - dh-systemd doesn't exist at all
+		packages=( "${packages[@]/dh-systemd}" )
+
+		# - libdevmapper-dev is missing critical structs (too old)
+		packages=( "${packages[@]/libdevmapper-dev}" )
+		extraBuildTags+=' exclude_graphdriver_devicemapper'
+
+		# - btrfs-tools is missing "ioctl.h" (too old), so it's useless
+		#   (since kernels on precise are old too, just skip btrfs entirely)
+		packages=( "${packages[@]/btrfs-tools}" )
+		extraBuildTags+=' exclude_graphdriver_btrfs'
+	fi
+
 	echo "RUN apt-get update && apt-get install -y ${packages[*]} --no-install-recommends && rm -rf /var/lib/apt/lists/*" >> "$version/Dockerfile"
 
 	echo >> "$version/Dockerfile"
@@ -65,5 +84,5 @@ for version in "${versions[@]}"; do
 	echo >> "$version/Dockerfile"
 
 	echo 'ENV AUTO_GOPATH 1' >> "$version/Dockerfile"
-	awk '$1 == "ENV" && $2 == "DOCKER_BUILDTAGS" { print; exit }' ../../../Dockerfile >> "$version/Dockerfile"
+	awk '$1 == "ENV" && $2 == "DOCKER_BUILDTAGS" { print $0 "'"$extraBuildTags"'"; exit }' ../../../Dockerfile >> "$version/Dockerfile"
 done

contrib/builder/deb/ubuntu-debootstrap-precise/Dockerfile

@@ -0,0 +1,14 @@
+#
+# THIS FILE IS AUTOGENERATED; SEE "contrib/builder/deb/generate.sh"!
+#
+
+FROM ubuntu-debootstrap:precise
+
+RUN apt-get update && apt-get install -y bash-completion  build-essential curl ca-certificates debhelper  git libapparmor-dev  libsqlite3-dev --no-install-recommends && rm -rf /var/lib/apt/lists/*
+
+ENV GO_VERSION 1.4.2
+RUN curl -fSL "https://storage.googleapis.com/golang/go${GO_VERSION}.linux-amd64.tar.gz" | tar xzC /usr/local
+ENV PATH $PATH:/usr/local/go/bin
+
+ENV AUTO_GOPATH 1
+ENV DOCKER_BUILDTAGS apparmor selinux exclude_graphdriver_devicemapper exclude_graphdriver_btrfs

hack/make/.build-deb/rules

@@ -33,4 +33,4 @@ override_dh_installudev:
 	dh_installudev --priority=z80
 
 %:
-	dh $@ --with=systemd,bash-completion
+	dh $@ --with=bash-completion $(shell command -v dh_systemd_enable > /dev/null 2>&1 && echo --with=systemd)