Wiki source code of Openwrt Notes
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| author | version | line-number | content |
|---|---|---|---|
| 1 | |||
| 2 | |||
| 3 | = initramfs-kernel = | ||
| 4 | |||
| 5 | kernel runs /init. | ||
| 6 | |||
| 7 | /init is a script which sets INITRAMFS=1 and then execs /sbin/init. | ||
| 8 | |||
| 9 | /sbin/init is ELF comes from procd package. What it does (as pid=1): | ||
| 10 | |||
| 11 | * early (different from procd early): | ||
| 12 | ** mount /proc, /sysfs, and create /dev nodes, create /tmp subdirs etc | ||
| 13 | ** set PATH | ||
| 14 | * kmodloader in subprocess (waits until done) | ||
| 15 | * preinit | ||
| 16 | ** plugd in subprocess (seem to deal with firmware) | ||
| 17 | ** /etc/preinit in subprocess | ||
| 18 | * when /etc/preinit is done then it execvp the "real" /sbin/procd | ||
| 19 | |||
| 20 | procd states: | ||
| 21 | |||
| 22 | * early (first state): | ||
| 23 | ** coldplug (remount /dev, etc) | ||
| 24 | *** start udevtrigger in subproc | ||
| 25 | *** when udevtrigger completes, hotplug | ||
| 26 | *** when hotplug completes, next state (ubus) | ||
| 27 | * ubus: | ||
| 28 | ** start attempts to connect to ubs | ||
| 29 | ** start ubus as service | ||
| 30 | ** once connection's done then next state (init) | ||
| 31 | * init - read /etc/inittab and run: | ||
| 32 | ** respawn - things that need to keep rerunning once quitted | ||
| 33 | ** askconsole | ||
| 34 | ** askfirst - the "Press Enter to activate this console" message | ||
| 35 | ** sysinit - (usually /etc/init.d/rcS with S) and then next state (running) | ||
| 36 | * running - waits for shutdown signal (usr1/usr2) or reboot (int/term) | ||
| 37 | * shutdown | ||
| 38 | ** runs shutdown command per inittab (also /etc/init.d/rcS but with K) | ||
| 39 | ** when done next state (halt) | ||
| 40 | * halt - kill everything and either enter sleep loop or reboots | ||
| 41 | |||
| 42 | = Debian = | ||
| 43 | |||
| 44 | Things to do after debootstrap: | ||
| 45 | |||
| 46 | * [[get rid of systemd>>http://without-systemd.org/wiki/index.php/How_to_remove_systemd_from_a_Debian_Stretch_installation]] | ||
| 47 | * set hostname | ||
| 48 | * set root password | ||
| 49 | * /etc/network/interfaces (TODO: swconfig while still in openwrt initramfs space?) | ||
| 50 | * apt-get install net-tools file ntp openssh-server gcc | ||
| 51 | ** net-tools for ifconfig | ||
| 52 | ** gcc for? | ||
| 53 | * read-only root | ||
| 54 | |||
| 55 | Needs CONFIG_DEVTMPFS=y in kernel. | ||
| 56 | |||
| 57 | {{code language="bash"}} | ||
| 58 | mkdir -pv /mnt && mknod /dev/sda b 8 0 && cryptsetup open /dev/sda usb && vgchange -ay vol_grp1 && mount /dev/vol_grp1/logical_vol1 /mnt | ||
| 59 | {{/code}} | ||
| 60 | |||
| 61 | {{code language="bash"}} | ||
| 62 | chroot /mnt /bin/bash | ||
| 63 | {{/code}} | ||
| 64 | |||
| 65 | {{code language="bash"}} | ||
| 66 | mount proc /proc -t proc | ||
| 67 | {{/code}} | ||
| 68 | |||
| 69 | {{code language="bash"}} | ||
| 70 | exec switch_root /mnt /sbin/init | ||
| 71 | {{/code}} | ||
| 72 | |||
| 73 | {{code language="bash"}} | ||
| 74 | ip addr add dev eth0 IP/NM | ||
| 75 | ip link set eth0 up | ||
| 76 | ip route add default via GW | ||
| 77 | {{/code}} | ||
| 78 | |||
| 79 | = Network = | ||
| 80 | |||
| 81 | {{code language="bash"}} | ||
| 82 | sed -re 's/^boot_run_hook/#\0/g' -i /etc/preinit | ||
| 83 | PREINIT=1 . /etc/preinit | ||
| 84 | pi_ifname=eth0.1 preinit_ip | ||
| 85 | pi_ifname=eth0.2 preinit_ip | ||
| 86 | {{/code}} |