Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.debian.kernel > #59978 > unrolled thread

Bug#887159: initramfs-tools can use busybox as complete replacement for klibc

Back to article view | Back to linux.debian.kernel

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  Bug#887159: initramfs-tools can use busybox as complete replacement for klibc Ben Hutchings <ben@decadent.org.uk> - 2018-01-14 18:10 +0100
    Processed: Re: initramfs-tools can use busybox as complete  replacement for klibc "Debian Bug Tracking System" <owner@bugs.debian.org> - 2019-02-06 20:10 +0100
    Bug#887159: initramfs-tools can use busybox as complete replacement for klibc Ben Hutchings <ben@decadent.org.uk> - 2019-02-06 20:10 +0100
    Bug#887159:  Peto Mica <micapeto12@gmail.com> - 2019-03-04 03:30 +0100
    Bug#887159:  Peto Mica <micapeto12@gmail.com> - 2019-03-04 03:40 +0100

#59978 — Bug#887159: initramfs-tools can use busybox as complete replacement for klibc

[Multipart message — attachments visible in raw view] — view raw

Source: initramfs-tools
Version: 0.130
Severity: wishlist

On Sun, 2018-01-14 at 17:03 +0100, Denys Vlasenko wrote:
> On Wed, Aug 23, 2017 at 2:43 AM, Ben Hutchings <ben@decadent.org.uk> wrote:
> > > > > > On Mon, 2017-08-14 at 16:42 +0200, Denys Vlasenko wrote:
> > > > > > > > > run-init
> > > > > > > 
> > > > > > > This tool is doing this:
> > > > > > 
> > > > > > [...]
> > > > > > > There is the "switch_root" tool in util-linux which does the
> > > > > > > crucial part of this functionality - deleting / remounting /
> > > > > > > chrooting.
> > > > > > > It is in bbox too.
> > > > > > 
> > > > > > initramfs-tools used to use switch_root if possible, but it
> > > > > > didn't
> > > > > > support the -d (drop capabilities) option.  Later on we needed
> > > > > > validation of the init filename to support symlinks (e.g.
> > > > > > /sbin/init ->
> > > > > > /lib/systemd/systemd), so I added and used the -n (dry run)
> > > > > > option to
> > > > > > run-init.  busybox would need to support both of these.
> > > > > 
> > > > > I added run-init to busybox just now, but I don't see -n option
> > > > > in
> > > > > klibc-2.0.4 source. Can you point me to the source code with -n?
> > > > 
> > > > It's not upstream yet, but in a Debian patch:
> > > > https://sources.debian.net/src/klibc/2.0.4-9/debian/patches/run-ini
> > > > t-add-dry-run-mode.patch/
> > > 
> > > Done:
> > > 
> > > $ ./busybox run-init
> > > BusyBox v1.28.0.git (2017-08-21 18:55:09 CEST) multi-call binary.
> > > 
> > > Usage: run-init [-d CAP,CAP...] [-n] [-c CONSOLE_DEV] NEW_ROOT
> > > NEW_INIT [ARGS]
> > > 
> > > Free initramfs and switch to another root fs:
> > > chroot to NEW_ROOT, delete all in /, move NEW_ROOT to /,
> > > execute NEW_INIT. PID must be 1. NEW_ROOT must be a mountpoint.
> > > 
> > >     -c DEV    Reopen stdio to DEV after switch
> > >     -d CAPS   Drop capabilities
> > >     -n        Dry run
> > 
> > Great.  Once these changes are in the Debian package, I can update
> > initramfs-tools to make klibc-utils optional.
> 
> busybox 1.28.0 is released, it contains the addition of run-init.

Thanks.  I'm opening a bug for this so I don't forget about it.

Ben.

-- 
Ben Hutchings
The generation of random numbers is too important to be left to chance.
                                                       - Robert Coveyou

[toc] | [next] | [standalone]

#63264 — Processed: Re: initramfs-tools can use busybox as complete replacement for klibc

Processing control commands:

> block -1 with 921556
Bug #887159 [src:initramfs-tools] initramfs-tools can use busybox as complete replacement for klibc
887159 was not blocked by any bugs.
887159 was not blocking any bugs.
Added blocking bug(s) of 887159: 921556

-- 
887159: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=887159
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems

[toc] | [prev] | [next] | [standalone]

#63265

[Multipart message — attachments visible in raw view] — view raw

Control: block -1 with 921556

Currently an initramfs built with both busybox and klibc-utils
installed has these executables in /bin from klibc-utils:

    chroot          losetup         pivot_root      run-init
    fstype          minips          poweroff
    halt            nfsmount        reboot
    ipconfig        nuke            resume

Several of these are already redundant with the busybox versions
installed in /sbin:

    chroot          losetup         poweroff
    halt            pivot_r
oot      reboot

The next upload of klibc will stop installing these commands when they
are redundant.

As Denys said, busybox 1.28.0 added replacements for some commands
which we can enable when we update the busybox package:

    ipconfig  [CONFIG_IPCONFIG]
    nuke      [CONFIG_NUKE]
    resume    [CONFIG_RESUME]
    run-init  [CONFIG_RUN_INIT]

I opened bug #921540 for the new upstream version and bug #921556 for
the configuration change.

That still leaves these without a drop-in replacement in busybox:

    fstype    might be replaceable with blkid
    minips    not needed by initramfs-tools, but used by live-boot
              because busybox ps does not support "h" or "-C" options
    nfsmount  should be replaceable with mount

Ben.

-- 
Ben Hutchings
Man invented language to satisfy his deep need to complain.
                                                          - Lily Tomlin

[toc] | [prev] | [next] | [standalone]

#63486 — Bug#887159:

[Multipart message — attachments visible in raw view] — view raw

petomica@azet.sk

[toc] | [prev] | [next] | [standalone]

#63487 — Bug#887159:

[Multipart message — attachments visible in raw view] — view raw

petomica@azet.sk

[toc] | [prev] | [standalone]

Back to top | Article view | linux.debian.kernel

csiph-web