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| = Current Architecture of Plasma Mobile =
| | {{Note|This page is now on [[https://docs.plasma-mobile.org/Porting.html https://docs.plasma-mobile.org/]]}} |
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| == For ARM devices which requires Android binary blobs ==
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| * Kernel, either provided by vendor or thirdparty with config options enabled to support LXC containers
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| * AOSP/LineageOS base, built with core_tiny target, just base items
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| * LXC container with Neon/Ubuntu rootfs containing KWin/Wayland and Plasma Mobile
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| === Kernel ===
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| Kernel needs to support the various config options, you can use lxc-checkconfig script provided by lxc userspace tools to check if all required features are enabled, for example:
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| <pre>% CONFIG=arch/arm64/configs/bullhead_defconfig lxc-checkconfig
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| --- Namespaces ---
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| Namespaces: enabled
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| Utsname namespace: enabled
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| Ipc namespace: enabled
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| Pid namespace: enabled
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| User namespace: enabled
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| Network namespace: missing
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| Multiple /dev/pts instances: enabled
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| --- Control groups ---
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| Cgroup: enabled
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| Cgroup clone_children flag: enabled
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| Cgroup device: enabled
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| Cgroup sched: enabled
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| Cgroup cpu account: enabled
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| Cgroup memory controller: enabled
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| Cgroup cpuset: enabled
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| [..]</pre> | |
| Below is the list of the config options,
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| <pre>CONFIG_CGROUP_DEVICE=y
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| CONFIG_CPUSETS=y
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| CONFIG_CGROUP_MEM_RES_CTLR=y
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| CONFIG_CGROUP_PERF=y
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| CONFIG_UTS_NS=y
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| CONFIG_IPC_NS=y
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| CONFIG_USER_NS=y
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| CONFIG_PID_NS=y
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| CONFIG_DEVPTS_MULTIPLE_INSTANCES=y</pre>
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| === AOSP/LineageOS base ===
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| AOSP/LineageOS base should have all non-required things removed and some changes in base to accomodate needs of libhybris and container containing Linux system. Below is list of various changes,
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| ==== Export PATH and LD_LIBRARY_PATH to point to lxc userspace tools ====
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| We use prebuilt lxc userspace tools from [https://jenkins.linuxcontainers.org/ linux containers CI]. Those are installed in /data partition which by default is not in the PATH android shell looks binaries into. Modify the system/core/rootdir/init.environ.rc file to include the path of LXC userspace tools in $PATH and export LD_LIBRARY_PATH.
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| <pre class="patch">project system/core/
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| diff --git a/rootdir/init.environ.rc.in b/rootdir/init.environ.rc.in
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| index c32337a..9d91d60 100644
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| --- a/rootdir/init.environ.rc.in
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| +++ b/rootdir/init.environ.rc.in
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| @@ -1,6 +1,6 @@
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| # set up the global environment
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| on init
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| - export PATH /sbin:/vendor/bin:/system/sbin:/system/bin:/system/xbin
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| + export PATH /data/lxc/lxc/bin:/sbin:/vendor/bin:/system/sbin:/system/bin:/system/xbin
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| export ANDROID_BOOTLOGO 1
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| export ANDROID_ROOT /system
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| export ANDROID_ASSETS /system/app
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| @@ -8,6 +8,7 @@ on init
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| export ANDROID_STORAGE /storage
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| export ASEC_MOUNTPOINT /mnt/asec
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| export LOOP_MOUNTPOINT /mnt/obb
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| + export LD_LIBRARY_PATH /data/lxc/lxc/lib
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| export BOOTCLASSPATH %BOOTCLASSPATH%
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| export SYSTEMSERVERCLASSPATH %SYSTEMSERVERCLASSPATH%
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| export LD_PRELOAD libsigchain.so%TARGET_LDPRELOAD%</pre>
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| However, LD_LIBRARY_PATH doesn't work for AOSP based android image and needs investigation. See [https://phabricator.kde.org/T4941 phabricator task] for more details.
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| ==== Disable enforced PIE executables in bionic ====
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| ==== Disable SELinux ====
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| ==== Remove the nosuid,nodev option from the data partition ====
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| ==== Apply bionic patch to shift TLS slots ====
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| ==== Fix Permission for backlight brightness file ====
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| == For devices which don't require Android binary blobs ==
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| * Normal Linux system with kernel and drivers supporting Wayland
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| * KWin/Wayland and Plasma Mobile packages
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