Travis: add secondary Linux build target

The goal is to reduce the overall wall clock time of our test builds.

This secondary Linux target uses the no-sudo container setup with a Qt
5.10.1 backport and tests the build without BT support as well as the
mobile build (but not the full desktop build and doesn't create an
AppImage as the pre-built Qt5.10.1 is missing QtWebKit).

In exchange we remove the no-bt and mobile build from the existing linux
target.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

.travis.yml

@@ -55,6 +55,46 @@ matrix:
             - libglib2.0-dev
             - mdbtools-dev
 
+    - env: SUBSURFACE_PLATFORM='linux2'
+      os: linux
+      dist: trusty
+      language: c++
+      addons:
+        apt:
+          sources:
+            - sourceline: 'ppa:beineri/opt-qt-5.10.1-trusty'
+              key_url: 'https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x10C56D0DE9977759'
+          packages:
+            - qt510base
+            - qt510connectivity
+            - qt510declarative
+            - qt510location
+            - qt510quickcontrols
+            - qt510quickcontrols2
+            - qt510script
+            - qt510translations
+            - qt510svg
+            - qt510tools
+            - git
+            - g++
+            - make
+            - autoconf
+            - automake
+            - libtool
+            - cmake
+            - pkg-config
+            - libxml2-dev
+            - libxslt1-dev
+            - libzip-dev
+            - libsqlite3-dev
+            - libusb-1.0-0-dev
+            - libssl-dev
+            - libssh2-1-dev
+            - libcurl4-openssl-dev
+            # Not a subsurface dependency, but a Qt dependency
+            - mesa-common-dev
+            - libxcb-xinerama0
+
     - env: SUBSURFACE_PLATFORM="android"
       # Currently hard coded to arm
       os: linux

scripts/linux/travisbuild.sh

@@ -15,9 +15,7 @@ export CMAKE_PREFIX_PATH=$QT_ROOT/lib/cmake
 # to create an AppImage
 cd ..
 
-bash -e -x ./subsurface/scripts/build.sh -desktop -no-bt
+bash -e -x ./subsurface/scripts/build.sh -desktop -create-appdir -build-with-webkit
-rm -rf subsurface/build
-bash -e -x ./subsurface/scripts/build.sh -both -create-appdir -build-with-webkit
 
 export QT_PLUGIN_PATH=$QT_ROOT/plugins
 export QT_QPA_PLATFORM_PLUGIN_PATH=$QT_ROOT/plugins

scripts/linux2/after_success.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+# we don't do anything here
+
+exit 0

scripts/linux2/before_install.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# prep things so we can build for Linux
+# we have a custom built Qt some gives us just what we need, including QtWebKit
+#
+# this is built from the latest version as of 2017-11-09 in the 5.9 branch and
+# therefore calls itself Qt-5.9.3
+
+set -x
+
+# Travis only pulls shallow repos. But that messes with git describe.
+# Sorry Travis, fetching the whole thing and the tags as well...
+git fetch --unshallow
+git pull --tags
+git describe
+
+. /opt/qt510/bin/qt510-env.sh
+export QT_ROOT=/opt/qt510
+
+# TestPreferences uses gui calls, so run a xvfb so it has something to talk to
+export DISPLAY=:99.0
+sh -e /etc/init.d/xvfb start
+

scripts/linux2/travisbuild.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+set -x
+set -e
+
+# this gets executed by Travis when building an AppImage for Linux
+# it gets started from inside the subsurface directory
+
+export PATH=$QT_ROOT/bin:$PATH # Make sure correct qmake is found on the $PATH for linuxdeployqt
+export CMAKE_PREFIX_PATH=$QT_ROOT/lib/cmake
+
+# the global build script expects to be called from the directory ABOVE subsurface
+# build both desktop and mobile - first desktop without BT support and without
+# webkit to make sure that still works, then with all components in order
+# to create an AppImage
+cd ..
+
+bash -e -x ./subsurface/scripts/build.sh -desktop -no-bt
+rm -rf subsurface/build
+bash -e -x ./subsurface/scripts/build.sh -mobile
+