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Zucca
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Joined: 14 Jun 2007
Posts: 3869
Location: Rasi, Finland
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 Posted: Mon Jan 13, 2025 5:32 pm Post subject: |
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| pingtoo wrote: | | One of "init" duty for linux is reap zombie process. |
Ok. I thought this was kernel's job. Is it really so? That would explain one oddity I have...
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..: Zucca :..
| My gentoo installs: | init=/sbin/openrc-init
-systemd -logind -elogind seatd |
| Quote: | | I am NaN! I am a man! |
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grknight
Retired Dev
Joined: 20 Feb 2015
Posts: 1981
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| Posted: Mon Jan 13, 2025 5:46 pm Post subject: |
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| Zucca wrote: | | pingtoo wrote: | | One of "init" duty for linux is reap zombie process. |
Ok. I thought this was kernel's job. Is it really so? That would explain one oddity I have... |
Yes, it is init's job. See a simple example from openrc-init that catches SIGCHLD and reaps |
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Fulgurance
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Joined: 15 Feb 2017
Posts: 1243
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| Posted: Mon Jan 13, 2025 6:57 pm Post subject: |
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| NeddySeagoon wrote: | Fulgurance,
Lets back off a little.
You have a VM with a boot loader and a kernel and not much else.
What is in /dev is the VM root before anything is started.
You must have at least /dev/null and /dev/console or it all comes to a grinding halt.
The must be device special nodes too.
How does | Code: | | mount --bind /run /run |
work?
--bind makes an already mounted filesystem visible somewhere else ... but you have said nothing about mounting run anywhere.
The kernel has mounted root, then its all up to you.
/run is usually tmpfs, so that it can be rw, even an a read only root fs.
I don't know what the --rbind mounts do either, as those filesystems are not mounted anywhere yet.
needs shared libraries.
| Code: | $ lddtree /bin/bash
/bin/bash (interpreter => /lib64/ld-linux-x86-64.so.2)
libreadline.so.8 => /usr/lib64/libreadline.so.8
libtinfow.so.6 => /lib64/libtinfow.so.6
libtinfo.so.6 => /lib64/libtinfo.so.6
libc.so.6 => /lib64/libc.so.6 |
Start off with a statically linked busybox
Where do you set $PATH ?
mount is actually /bin/mount, so it won't be found with an empty $PATH.
Hint: look at some initrd init scrips. |
Thanks NeddySeagoon. Because of your comment, I realized my mount steps where wrong at some points, so I updated like this:
| Code: |
#!/bin/bash
mount -o remount rw /
mount -o nosuid,noexec,nodev /proc
mount -o nosuid,noexec,nodev /sys
mount -o mode=0755,nosuid /dev
mount /run
mkdir -p /run/lock
chmod 1777 /run/lock
mkdir -p /dev/shm
mount -o nosuid,nodev /dev/shm
mkdir -pv /sys/fs/cgroup
mount -o nosuid,noexec,nodev /sys/fs/cgroup
ln -sf /proc/self/fd/0 /dev/stdin
ln -sf /proc/self/fd/1 /dev/stdout
ln -sf /proc/self/fd/2 /dev/stderr
ln -sfn /proc/self/fd /dev/fd
ln -sf /proc/kcore /dev/core
. /etc/profile
exec zeroinit
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This is the content of my /dev directory after my updated small init script (I exec /bin/bash instead of my init just to check what is mounted):
https://i.ibb.co/s60NPd6/dev.png
Now I have few questions:
-Do I miss something else vital, or do I have the minimum ?
-I understood I have to use openvt and agetty.
So I did this call:
| Code: |
openvt -f -w -c 1 -- /bin/sh -c "agetty - $TERM"
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But why when I press CTRL+ALT+3 for example, I can't open another TTY ?
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My actual project: https://github.com/Fulgurance/ISM
Ingenius Software Manager is a tool to build and manage a Linux system from scratch.
It will able to manage a linux installation just with a given path to the futur root path |
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