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
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