On Dec 12, 2012, at 7:50 AM, Rick Miller wrote:
On Wed, Dec 12, 2012 at 10:44 AM, Rick Miller vmil...@hostileadmin.com
wrote:
Hi All,
How is sysinstall invoked in a FreeBSD 8.x mfsroot.gz?
It's actually invoked in the place of init(8).
To explain more, I would like to boot into a shell as opposed to
sysinstall. safe mode and single user don't seem to.
Safe mode and single user won't work because sysinstall is acting as init and
it doesn't implement those functions.
To run a shell script in the place of init(8), you have to do some
bootstrapping.
Enter DruidBSD ( … not to be confused with previously discussed Druid [in
another thread]).
DruidBSD is a ~24MB ISO (~32MB if you get the version that has the extra tools
like memtest86, etc.):
http://druidbsd.sourceforge.net/download.shtml#DruidBSD
Not only does it do what you're asking about … boot to a shell … but you can
customize it.
It uses the same build framework as the Druid (requiring GNU make, mkisofs, and
[optionally] perl -- only required if you want the ISO to work from both CD/DVD
_and_ USB thumb drive). You can download the source code, make changes to the
custom /etc/rc which does the bootstrapping for you, and more -- then when
finished, simply say gmake freebsd to produce your new custom media.
It doesn't stop there… the /etc/rc that's in the mfsroot (link below):
http://druidbsd.cvs.sourceforge.net/viewvc/druidbsd/druidbsd/druidbsd/dep/freebsd/mfsroot/src/etc/rc?revision=1.1.1.1view=markup
Is designed to bust you out of the mfsroot and bootstrap you not into a
derelict sh(1) prompt, but instead a [more] usable bash(1) prompt complete with
hundreds of extra utilities.
PRO TIP: The Druid (which is the [much] larger ~500MB FreeBSD Installer that
uses the same build framework) actually has a miniature version of DruidBSD
tucked into its boot loader. That is to explain that when you use the FreeBSD
Druid installer, the beastie boot menu has a fancy feature where you can select
a different mfsroot from the menu (if you select the rescue_mfsroot then
you're essentially invoking a custom version of DruidBSD, which we're talking
about right now w/respect to replacing sysinstall(8) in an mfsroot with a
bootstrap-to-interactive-shell).
--
Devin
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