Force trusty to use -lts-xenial and remove kernel 3.4 hacks

targets/xorg

@@ -6,7 +6,7 @@ REQUIRES='audio'
 PROVIDES='x11'
 DESCRIPTION='X.Org X11 backend. Enables GPU acceleration on supported platforms.'
 CHROOTBIN='croutoncycle croutontriggerd croutonxinitrc-wrapper setres xinit'
-CHROOTETC='xbindkeysrc.scm xorg-intel-sna.conf xserverrc xserverrc-xorg xserverrc-local.example'
+CHROOTETC='xbindkeysrc.scm xserverrc xserverrc-xorg xserverrc-local.example'
 if [ -z "$TARGETNOINSTALL" -a -f "/sys/class/tty/tty0/active" ]; then
     error 99 "xorg target is only supported on Freon-based systems."
 fi
@@ -25,29 +25,19 @@ rm -f '/etc/crouton/xserverrc-x11'
 backport=''
 if release -eq precise; then
     if [ "${ARCH#arm}" = "$ARCH" ]; then
-        # Note: lts-trusty mesa requires kernel version >=3.6
-        if ! uname -r | grep -q "^3.4."; then
-            backport='-lts-trusty'
-        fi
+        backport='-lts-trusty'
     else
         # ARM only offers quantal backport at the moment
         backport='-lts-quantal'
     fi
+elif release -eq trusty; then
+    backport='-lts-xenial'
 fi
 
 # Intel?
 inteldriver=''
-pinmesa=''
 if [ "${ARCH#arm}" = "$ARCH" ]; then
     inteldriver="xserver-xorg-video-intel$backport"
-
-    # On saucy onwards, if kernel version is 3.4, manually pin down old mesa
-    # libraries, as new ones require version >=3.6 (see issue #704).
-    # This is only required on non-Atom Intel chipsets (Atom uses i915 dri driver)
-    if release -ge saucy && uname -r | grep -q "^3.4." &&
-            ! grep -q 0xa0 /sys/class/graphics/fb0/device/device; then
-        pinmesa='y'
-    fi
 fi
 
 # Catalog relevant and irrelevant video drivers
@@ -67,72 +57,11 @@ removevideodrivers="$fbdev $inteldriver"
 # Compile crazy xorg hacks
 compile freon '-ldl -ldrm -I/usr/include/libdrm' so libdrm-dev
 
-# Pin precise's version of mesa if necessary
+# No systems use kernel 3.4 anymore, so remove the mesa hack
 pinfile='/etc/apt/preferences.d/precise-mesa-pin'
 pinlist='/etc/apt/sources.list.d/precise.list'
 pindummypkg='libwayland-egl1-dummy'
-if [ -n "$pinmesa" ]; then
-    # Create a dummy libwayland-egl1 package, to satisfy dependencies
-    # (the libraries are actually provided by libegl1-mesa-drivers in precise)
-    install --minimal --asdeps equivs
-
-    DEBTMP="`mktemp -d crouton.XXXXXX --tmpdir=/tmp`"
-    addtrap "rm -rf --one-file-system '$DEBTMP'"
-
-    ( cd "$DEBTMP"; equivs-build - ) <<END
-Section: misc
-Priority: optional
-Standards-Version: 3.9.2
-
-Package: $pindummypkg
-Version: 8.0.4
-Depends: libegl1-mesa-drivers
-Provides: libwayland-egl1
-Description: Dummy package providing libwayland-egl1
-END
-
-    # Add precise package sources
-    mirror="`detect_mirror`"
-
-    cat > "$pinlist" <<END
-deb $mirror precise main
-deb $mirror precise-updates main
-deb $mirror precise-security main
-END
-
-    cat > "$pinfile" <<END
-# Do not install any packages from precise by default
-Package: *
-Pin: release n=precise
-Pin-Priority: -10
-
-# Install mesa packages and their dependencies from precise
-Package: libegl1-mesa:* libegl1-mesa-dbg:* libegl1-mesa-dev:* \
-         libegl1-mesa-drivers:* libegl1-mesa-drivers-dbg:* \
-         libgl1-mesa-dev:* libgl1-mesa-dri:* libgl1-mesa-dri-dbg:* \
-         libgl1-mesa-glx:* libgl1-mesa-glx-dbg:* \
-         libglapi-mesa:* libglapi-mesa-dbg:* \
-         libgles1-mesa:* libgles1-mesa-dbg:* libgles1-mesa-dev:* \
-         libgles2-mesa:* libgles2-mesa-dbg:* libgles2-mesa-dev:* \
-         libdrm-nouveau1a:* libllvm3.0:* libudev0:*
-Pin: release n=precise
-Pin-Priority: 1100
-END
-
-    # Fetch new package sources
-    apt-get update || true
-
-    # Forcibly replace libwayland-egl1-mesa by libwayland-egl1-dummy
-    # (dpkg -r does not fail if package does not exist)
-    dpkg -r --force-depends libwayland-egl1-mesa libwayland-egl1-mesa:i386
-    dpkg -i --force-depends "$DEBTMP"/libwayland-egl1-dummy_*_all.deb
-
-    # Downgrade packages, -f is needed as dependencies are broken
-    # This happens to install python2.7-minimal as well, pulled in by a wrong
-    # dependency of ubuntu-minimal-1.267 (precise), which we did not install.
-    # Looks like an apt bug, I guess we can live with that.
-    apt-get -y --force-yes --no-install-recommends dist-upgrade -f
-elif [ -f "$pinfile" -o -f "$pinlist" ]; then
+if [ -f "$pinfile" -o -f "$pinlist" ]; then
     # No longer need the pin; remove it
     rm -f "$pinfile" "$pinlist"
     apt-get update || true