IRC log for #maemo on 20150531

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04:27.25L29AhLoading ui!
04:27.25L29Ahzsh: segmentation fault  LANG=en snappy *
04:27.25L29Ahnice one snappy
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05:22.48KotCzarny:)
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15:18.22NIN101new rescueOS version http://n900.quitesimple.org/rescueOS/rescueOS-1.2/
15:20.37kerionice
15:22.18kerioNIN101: are you sure about "rootdelay" without a parameter
15:22.26kerioshouldn't it be rootwait
15:23.43NIN101well, it works :-).
15:24.06kerioand what's the point?
15:24.55bencohoh ... yay, thx :-)
15:25.08KotCzarny:)
15:26.41bencoh"NEW kernel rebuilt (gnoutchd)" anything added to kernel ?
15:30.30KotCzarnynin101: feature idea: virtual terminals and switching via ctrl-right/left
15:31.28NIN101kerio: there was probably a reason it was added back  then (so it boots),  or it is a leftover of something. it can't hurt.
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15:31.37NIN101bencoh: nothing added.
15:32.16NIN101KotCzarny: hmm.
15:32.42kerioNIN101: i would've called the kernel rescueOS-1.2.zImage or something
15:33.11KotCzarnymore like rescueOS-n900-1.2.zImage
15:33.49NIN101ok, I'll rename it.
15:38.05kerioit works without rootwait
15:38.09keriodo you even need the root= parameter
15:38.34KotCzarnyyou always need the root= parameter
15:38.42keriobut
15:38.43KotCzarnyunless it was known at the build time
15:38.45keriothere's an initrd
15:38.57KotCzarnyinitrd != initramfs
15:39.26keriohold on why is it needed to explicitly unmount the maemo root?
15:39.43kerioKotCzarny: yes but nothing should be mounting any root fs here
15:39.49NIN101who says it's needed?
15:39.50kerio...right?
15:40.10NIN101it should be taken care of on shutdown
15:40.32KotCzarnykerio, if you dont specify any root= option kernel would just hang because it wouldnt find init
15:40.51kerioNIN101: i meant automatically
15:40.55KotCzarnyunless you supply cmd line at the build time
15:40.57kerioas in the kernel would deal with it
15:42.32NIN101kerio: not sure I follow, why should the kernel unmount things automatically?
15:42.47keriowhy shouldn't it?
15:43.46NIN101kerio: write your suggestion to lkml.
15:43.48NIN101:-)
15:43.51kerioalright
15:43.56kerioanyway, no need for any magic cmdline apparently
15:43.59keriounless it was compiled in
15:44.17keriooh rofl
15:44.22KotCzarnycat /proc/cmdline
15:44.30keriopoweroff caused a panic
15:44.38keriodue to missing root
15:45.47NIN101hmm?
15:46.04KotCzarnydont mind him, he is using it in the way its not supposed to be
15:46.14NIN101yeah
15:46.48keriowell, the initrd exited
15:47.03KotCzarnygood for funsies and learning, but otherwise not important
15:47.07kerioso the kernel tried to keep booting
15:47.37KotCzarnykerio, ever tried kill -9 1 ?
15:47.49kerioit doesn't seem like a good idea
15:47.56keriowait nvm that's totally harmless
15:47.57KotCzarnyits just the same thing
15:47.59L29Ahyeah it must be the same
15:48.01kerioinit can't be SIGKILLed
15:48.17KotCzarnyeverything can be killed via kill -9
15:48.21KotCzarnyunless its a zombie
15:48.28L29Ahkerio: do this on your current machine then ;p
15:49.05keriothe linux kernel will not deliver any fatal signal to init, apparently
15:49.08keriowhich includes SIGKILL
15:49.16L29Ahit delivers SIGSEGV pretty well :3
15:49.57KotCzarnykerio, just try it
15:50.14keriohold on, what *is* ram0
15:50.15KotCzarnysave your work tho
15:50.28KotCzarnyseriously, you are asking newbie questions
15:50.30KotCzarny:)
15:50.48keriowow that's not condescending at all
15:51.06KotCzarnyram* is a ramdisk block device
15:51.19kerio...yes, i figured as much even without reading the documentation
15:51.21KotCzarnycan be created and destroyed dynamically
15:51.25keriowhat is it used for in rescueos?
15:51.30KotCzarnyfor initrd
15:51.57KotCzarnyand differs from initramfs in that way, that its seen as a block device, and not a plain fs
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15:52.37KotCzarnyso you have to prepare it via mkfs earlier
15:52.55KotCzarnyinitramfs is just cpio archive glued to kernel
15:53.15kerioyeah i was just missing the fact that "root=/dev/ram0" is actually special-cased in the kernel
15:53.22kerioto mean "mount the initrd as the only root"
15:53.43KotCzarnyyou cant have more than one root at a time
15:53.50KotCzarnyyou can use pivotroot etc
15:53.52L29Ahhow is it special?
15:53.58KotCzarnybut there is alsways only one /
15:54.07L29Ahthere's chroot ;)
15:54.27KotCzarnychroot is just an emulation ;)
15:54.28kerioL29Ah: the initrd, if present, is *always* mounted as / on the early phases of booting
15:54.34L29AhKotCzarny: you can't tell
15:54.47KotCzarnyl29ah: cd /proc/1/cwd, done
15:54.51KotCzarnyor something
15:54.56KotCzarnyi can tell
15:55.04kerioit will then do its own shit and eventually it should mount the actual root and pivot_root it
15:55.18L29Ahlrwxrwxrwx 1 root root 0 May 31 15:55 /proc/1/cwd -> /
15:55.19kerioand then exec*() the new init
15:55.19L29Ahit lies
15:55.28KotCzarnyno, not ls, do cd, then do ls
15:55.45L29Ahwhoa
15:55.48L29Ahsick shit
15:55.57KotCzarnyyeah, learned it quite a time ago
15:55.57L29AhKotCzarny: :*
15:56.02L29Ahtho i can use PID namespaces
15:56.06KotCzarnychroot is not safe at all
15:56.14KotCzarnyit's just a convenience
15:56.29kerioyeah, if you're leaving /proc in the jail
15:56.43KotCzarnykerio: there are more ways to escape chroot
15:56.48KotCzarnythat is just easiest
15:56.57keriothey all involve having root tho
15:57.03kerioor CAP_CHROOT, whatever
15:57.55keriothe easiest is definetely mkdir("tmp"), chroot("tmp"), chdir("..") x 1024, chroot(".")
15:58.22KotCzarnymine was 1 cmd
15:58.28KotCzarnyyours is 1027
16:00.20L29Ahkerio: didn't work
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20:06.35L29Ahis it possible to paginate uboot output or scroll it back?
20:06.49L29Ahhelp and printenv don't fit the screen
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20:31.01L29Ahdamn, uboot stopped to see my internal-mmc-hosted kernel after i've plugged in the external one
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20:37.16L29Ahoh no it does see
20:37.23L29Ahit's just emmc "forgot" the kernel
20:37.27L29Ahdamn
20:37.39L29Ahi woder how does this happen
20:38.57L29Ahwtf the directory is said to be modified two minutes ago
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20:53.31L29Ahyay after a reboot it REMEMBERED it back ><
20:53.58L29Ahi guess i should attach a power kernel to uboot to be able to reformat emmc to ext4
20:54.15L29Ahoh, i can haz ext3
21:12.25L29Ahqemu-user sucked so much i had to move gcc job back to n900 >_>
21:12.36L29Ahi take the phrase about two days back
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21:39.22chainsawbikeL29Ah, https://wiki.gentoo.org/wiki/Cross_Container_Support_Project - native cross-compiling gcc toolchain in a qemu-arm chroot
22:08.07bencohchainsawbike: does gcc runs in qemu ?
22:09.05bencohor does it work like scratchbox (native crosscompiler/tools and binfmt_misc trick to run target binaries in qemu) ?
22:37.29chainsawbikelike scratchbox
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