dinit on Android!

[IngwiePhoenix]

Hello!

Just dropping in here for a small little bit of cool stuff.

The steps for this are quite easy:

1. Install Termux
2. pkg install openssh
3. ssh-keygen
4. cp -R .ssh /sdcard
5. You can grab your pubkey and privkey now in case you need it. In addition, copy your own pubkey here.
6. cat /sdcard/your_key >> .ssh/authorized_keys
7. sshd
8. You can now SSH into your phone. Use id to pick the right username, then do: ssh <user>@<ip> -p 8022 - this should make things MUCH easier from here on out!
9. pkg install ndk-sysroot clang binutils-is-llvm make git
10. Clone this repo
11. ./configure --prefix=$PREFIX --syscontrolsocket=$PREFIX/var/run/dinitctl --sbindir=$PREFIX/bin --disable-cgroups --disable-shutdown
12. make -j(nproc)
13. make install

After that, you should have:

u0_a223@localhost ~> ll $PREFIX/bin/dinit*
-rwxr-xr-x 1 u0_a223 u0_a223 209K Jan 14 03:16 /data/data/com.termux/files/usr/bin/dinit
-rwxr-xr-x 1 u0_a223 u0_a223  27K Jan 14 03:16 /data/data/com.termux/files/usr/bin/dinit-monitor
-rwxr-xr-x 1 u0_a223 u0_a223 113K Jan 14 03:16 /data/data/com.termux/files/usr/bin/dinitcheck
-rwxr-xr-x 1 u0_a223 u0_a223  82K Jan 14 03:16 /data/data/com.termux/files/usr/bin/dinitctl

Next, you can install the "Termux:Boot" plugin. As per the instructions, create a .termux/boot folder. Here is a snippet of what I did:

u0_a223@localhost ~> cd .termux
u0_a223@localhost ~/.termux> mkdir boot
u0_a223@localhost ~/.termux> ls
boot  shell  termux.properties
u0_a223@localhost ~/.termux> cd boot
u0_a223@localhost ~/.t/boot> ls
u0_a223@localhost ~/.t/boot> ll /bin/sh
-rwxr-xr-x 1 root shell 321K Jan  1  2009 /bin/sh
u0_a223@localhost ~/.t/boot> nano 00-dinit
u0_a223@localhost ~/.t/boot> termux-fix-shebang ./00-dinit
u0_a223@localhost ~/.t/boot> cat 00-dinit
#!/data/data/com.termux/files/usr/bin/sh
# I couldn't find a way to preconfigure this...
dinit -d $PREFIX/etc/dinit.d

(I also temporarily added 01-sshd just in case, I plan to move that to a dinit unit.)

Here is the configure generated mconfig:

## Auto-generated by "./configure" for "Linux"
# All changes will be lost if "./configure" is re-run.

# See BUILD for help on all variables.

# Installation path options.

SBINDIR=/data/data/com.termux/files/usr/bin
MANDIR=/data/data/com.termux/files/usr/share/man
SYSCONTROLSOCKET=/data/data/com.termux/files/usr/var/run/dinitctl

# General build options.

CXX=g++
CXXFLAGS=-std=c++11 -Wall -Os -fno-plt -fno-rtti -flto
CXXFLAGS_EXTRA=
TEST_CXXFLAGS=$(CXXFLAGS) -fsanitize=address,undefined
TEST_CXXFLAGS_EXTRA=
CPPFLAGS=
LDFLAGS_BASE=
LDFLAGS=$(LDFLAGS_BASE) $(CXXFLAGS)
LDFLAGS_EXTRA=
TEST_LDFLAGS_BASE=$(LDFLAGS_BASE)
TEST_LDFLAGS=$(TEST_LDFLAGS_BASE) $(TEST_CXXFLAGS)
TEST_LDFLAGS_EXTRA=
BUILD_SHUTDOWN=no
STRIPOPTS=-s

# Feature settings
SUPPORT_CGROUPS=0
USE_INITGROUPS=1

# Optional settings
SHUTDOWN_PREFIX=

# Service defaults
DEFAULT_AUTO_RESTART=true
DEFAULT_START_TIMEOUT=60
DEFAULT_STOP_TIMEOUT=10

Now... why? Well, why not. o.o That's literally the only reason why. I have deployed dinit in docker containers and as a user-space init system a few times now - the service syntax is ultra simple and quick to produce and dinitctl list is easy and fast to read. I even tried to compile it for my TV through the OpenLGTV compiler to handle auto-mounting the inserted USB drive and starting Syncthing to transfer emulator saves. So yeah - I do it, because I can. :)

That's all! Have a nice day and thanks for this awesome init system!

Kind regards,
Ingwie

[mobin-2008]

Nice guide 👍 , I will move this