Ubuntu 16.04 boot as init=/root/init.sh and exec init 3 in shell, but why X11 started?
Ubuntu 16.04.5 default environment.
I want to do some custom job before init. grub.cfg as
linux /boot/vmlinuz ... ro init=/root/init.sh
init.sh:
#!/bin/bash
# do some task
exec init 3
after boot, X started.
if grub
linux /boot/vmlinuz ... ro init=/root/init.sh 3,can success boot into text mode.
according to https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html , 3 is not a kernel’s command-line parameters, kernel will pass it as an argument to init, here is /root/init.sh.
change /root/init.sh to :
#!/bin/bash
# do some task
echo $1
sleep 3s
exec init 3
I can see the value passed from kernel.
In my submission，no matter what value grub -> kernel -> /root/init.sh , I will discard the value and exec init as runlevel 3. why it doesn't work.
boot grub2 bash kernel init
asked Nov 13 '18 at 6:57
Bin Zhou
1
add a comment |
Ubuntu 16.04.5 default environment.
I want to do some custom job before init. grub.cfg as
linux /boot/vmlinuz ... ro init=/root/init.sh
init.sh:
#!/bin/bash
# do some task
exec init 3
after boot, X started.
if grub
linux /boot/vmlinuz ... ro init=/root/init.sh 3,can success boot into text mode.
according to https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html , 3 is not a kernel’s command-line parameters, kernel will pass it as an argument to init, here is /root/init.sh.
change /root/init.sh to :
#!/bin/bash
# do some task
echo $1
sleep 3s
exec init 3
I can see the value passed from kernel.
In my submission，no matter what value grub -> kernel -> /root/init.sh , I will discard the value and exec init as runlevel 3. why it doesn't work.
boot grub2 bash kernel init
asked Nov 13 '18 at 6:57
Bin Zhou
1
add a comment |
Ubuntu 16.04.5 default environment.
I want to do some custom job before init. grub.cfg as
linux /boot/vmlinuz ... ro init=/root/init.sh
init.sh:
#!/bin/bash
# do some task
exec init 3
after boot, X started.
if grub
linux /boot/vmlinuz ... ro init=/root/init.sh 3,can success boot into text mode.
according to https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html , 3 is not a kernel’s command-line parameters, kernel will pass it as an argument to init, here is /root/init.sh.
change /root/init.sh to :
#!/bin/bash
# do some task
echo $1
sleep 3s
exec init 3
I can see the value passed from kernel.
In my submission，no matter what value grub -> kernel -> /root/init.sh , I will discard the value and exec init as runlevel 3. why it doesn't work.
boot grub2 bash kernel init
asked Nov 13 '18 at 6:57
Bin Zhou
1
Ubuntu 16.04.5 default environment.
I want to do some custom job before init. grub.cfg as
linux /boot/vmlinuz ... ro init=/root/init.sh
init.sh:
#!/bin/bash
# do some task
exec init 3
after boot, X started.
if grub
linux /boot/vmlinuz ... ro init=/root/init.sh 3,can success boot into text mode.
according to https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html , 3 is not a kernel’s command-line parameters, kernel will pass it as an argument to init, here is /root/init.sh.
change /root/init.sh to :
#!/bin/bash
# do some task
echo $1
sleep 3s
exec init 3
I can see the value passed from kernel.
In my submission，no matter what value grub -> kernel -> /root/init.sh , I will discard the value and exec init as runlevel 3. why it doesn't work.
boot grub2 bash kernel init
boot grub2 bash kernel init
asked Nov 13 '18 at 6:57
Bin Zhou
1
asked Nov 13 '18 at 6:57
Bin Zhou
1
asked Nov 13 '18 at 6:57
Bin Zhou
1
asked Nov 13 '18 at 6:57
Bin Zhou
1
asked Nov 13 '18 at 6:57
Bin Zhou
1
1
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
according to poettering's response to my issue at systemd: https://github.com/systemd/systemd/issues/10752
we generally read /proc/cmdline, not argv, since the kernel removes some bits from the latter that we need to know. We essentially ignore argv altogether.
Hence, what you are trying to do doesn't work, you'd have to overmount /proc/cmdline instead with some file with the new arguments.
about 'overmount', according to https://unix.stackexchange.com/questions/364442/cant-mount-on-proc-cmdline/364448 ,
- make a copy of
/proc/cmdlineat/root/cmdline
- add
3at the end of/root/cmdline
- run command
mount -n --bind -o ro /root/cmdline /proc/cmdline
- run command
exec init
now system will boot with runlevel 3.
In summary, change /root/init.sh to
#!/bin/bash
# do some task
cp /proc/cmdline /root/cmdline
sed -i.bck '$s/$/ 3/' /root/cmdline
mount -n --bind -o ro /root/cmdline /proc/cmdline
exec init
system will boot into text mode after custom job finish as I except.
answered Nov 13 '18 at 13:34
Bin Zhou
1
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
according to poettering's response to my issue at systemd: https://github.com/systemd/systemd/issues/10752
we generally read /proc/cmdline, not argv, since the kernel removes some bits from the latter that we need to know. We essentially ignore argv altogether.
Hence, what you are trying to do doesn't work, you'd have to overmount /proc/cmdline instead with some file with the new arguments.
about 'overmount', according to https://unix.stackexchange.com/questions/364442/cant-mount-on-proc-cmdline/364448 ,
- make a copy of
/proc/cmdlineat/root/cmdline
- add
3at the end of/root/cmdline
- run command
mount -n --bind -o ro /root/cmdline /proc/cmdline
- run command
exec init
now system will boot with runlevel 3.
In summary, change /root/init.sh to
#!/bin/bash
# do some task
cp /proc/cmdline /root/cmdline
sed -i.bck '$s/$/ 3/' /root/cmdline
mount -n --bind -o ro /root/cmdline /proc/cmdline
exec init
system will boot into text mode after custom job finish as I except.
answered Nov 13 '18 at 13:34
Bin Zhou
1
add a comment |
according to poettering's response to my issue at systemd: https://github.com/systemd/systemd/issues/10752
we generally read /proc/cmdline, not argv, since the kernel removes some bits from the latter that we need to know. We essentially ignore argv altogether.
Hence, what you are trying to do doesn't work, you'd have to overmount /proc/cmdline instead with some file with the new arguments.
about 'overmount', according to https://unix.stackexchange.com/questions/364442/cant-mount-on-proc-cmdline/364448 ,
- make a copy of
/proc/cmdlineat/root/cmdline
- add
3at the end of/root/cmdline
- run command
mount -n --bind -o ro /root/cmdline /proc/cmdline
- run command
exec init
now system will boot with runlevel 3.
In summary, change /root/init.sh to
#!/bin/bash
# do some task
cp /proc/cmdline /root/cmdline
sed -i.bck '$s/$/ 3/' /root/cmdline
mount -n --bind -o ro /root/cmdline /proc/cmdline
exec init
system will boot into text mode after custom job finish as I except.
answered Nov 13 '18 at 13:34
Bin Zhou
1
add a comment |
according to poettering's response to my issue at systemd: https://github.com/systemd/systemd/issues/10752
we generally read /proc/cmdline, not argv, since the kernel removes some bits from the latter that we need to know. We essentially ignore argv altogether.
Hence, what you are trying to do doesn't work, you'd have to overmount /proc/cmdline instead with some file with the new arguments.
about 'overmount', according to https://unix.stackexchange.com/questions/364442/cant-mount-on-proc-cmdline/364448 ,
- make a copy of
/proc/cmdlineat/root/cmdline
- add
3at the end of/root/cmdline
- run command
mount -n --bind -o ro /root/cmdline /proc/cmdline
- run command
exec init
now system will boot with runlevel 3.
In summary, change /root/init.sh to
#!/bin/bash
# do some task
cp /proc/cmdline /root/cmdline
sed -i.bck '$s/$/ 3/' /root/cmdline
mount -n --bind -o ro /root/cmdline /proc/cmdline
exec init
system will boot into text mode after custom job finish as I except.
answered Nov 13 '18 at 13:34
Bin Zhou
1
according to poettering's response to my issue at systemd: https://github.com/systemd/systemd/issues/10752
we generally read /proc/cmdline, not argv, since the kernel removes some bits from the latter that we need to know. We essentially ignore argv altogether.
Hence, what you are trying to do doesn't work, you'd have to overmount /proc/cmdline instead with some file with the new arguments.
about 'overmount', according to https://unix.stackexchange.com/questions/364442/cant-mount-on-proc-cmdline/364448 ,
- make a copy of
/proc/cmdlineat/root/cmdline
- add
3at the end of/root/cmdline
- run command
mount -n --bind -o ro /root/cmdline /proc/cmdline
- run command
exec init
now system will boot with runlevel 3.
In summary, change /root/init.sh to
#!/bin/bash
# do some task
cp /proc/cmdline /root/cmdline
sed -i.bck '$s/$/ 3/' /root/cmdline
mount -n --bind -o ro /root/cmdline /proc/cmdline
exec init
system will boot into text mode after custom job finish as I except.
answered Nov 13 '18 at 13:34
Bin Zhou
1
answered Nov 13 '18 at 13:34
Bin Zhou
1
answered Nov 13 '18 at 13:34
Bin Zhou
1
answered Nov 13 '18 at 13:34
Bin Zhou
1
1
add a comment |
add a comment |
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