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Full Discussion: Why does a fakechroot exist?
Top Forums UNIX for Beginners Questions & Answers Why does a fakechroot exist? Post 303019985 by hicksd8 on Wednesday 11th of July 2018 12:32:35 PM
Old 07-11-2018
To put it plainly, chroot is a real change root and not a fake change root and so it affects the whole system, i.e. all users. Therefore, it takes root privilege to action. The whole system is switched to running on a different root directory. Therefore, a standard user cannot be allowed to do this.

A fake chroot is playing around within a users own environment and nobody else sees any change.

An example of a real chroot can be when a system doesn't boot properly so the sysadmin boots the system from DVD into single user mode. Having booted that way, the system root is the root of the DVD. Now the sysadmin can use chroot to switch to the normal hard disk root to see how the system behaves; stable or wobbly?

Fake change root is exactly what is says; fake!
Last edited by hicksd8; 07-12-2018 at 04:53 AM..
This User Gave Thanks to hicksd8 For This Post:
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LEARN ABOUT DEBIAN

adt-virt-chroot

adt-virt-chroot(1)					     Linux Programmer's Manual						adt-virt-chroot(1)

NAME

       adt-virt-chroot - autopkgtest virtualisation server using a chroot

SYNOPSYS

       adt-virt-chroot [options] =[chroot-name]
       adt-virt-chroot [options] [-rgain-root-cmd] /path/to/chroot

DESCRIPTION

       adt-virt-chroot provides an autopkgtest virtualisation server using a chroot install (or similar).

       Normally adt-virt-chroot will be invoked by adt-run.

       The  chroot to use must be specified.  If it starts with a = character then it is taken to be a chroot name known to dchroot(8).  Otherwise
       it must start with a / and will be taken to an absolute path.

OPTIONS

       --gain-root|-r gain-root-cmd
	      Specifies that adt-virt-chroot can become root (on the host) by prefixing its commands with gain-root-cmd.  The command may  consist
	      of  several words separated by whitespace, in which case words other than the first are supplied as additional arguments to the com-
	      mand; other shell (or other) metacharacters in gain-root-cmd are not interpreted or modified by adt-virt-chroot.	The actual command
	      to be run as root, and its arguments, are supplied as additional (separate) arguments to gain-root-cmd.

	      Root  privilege is needed, to successfully run chroot(8), if the chroot to use is specified as an absolute path.	The default is not
	      to take any special action when root will be needed, in which case for an absolute path chroot, adt-virt-chroot must be  started	as
	      root.

       -d | --debug
	      Enables debugging output.  Probably not hugely interesting.

INPUT, OUTPUT AND EXIT STATUS
       The behaviour of adt-virt-chroot is as described by the AutomatedTesting virtualisation regime specification.

SEE ALSO

       adt-run(1), adt-virt-null(1), adt-virt-xenlvm(1), /usr/share/doc/autopkgtest/.

AUTHORS AND COPYRIGHT

       This  manpage  is part of autopkgtest, a tool for testing Debian binary packages.  autopkgtest is Copyright (C) 2006-2007 Canonical Ltd and
       others.

       See /usr/share/doc/autopkgtest/CREDITS for the list of contributors and full copying conditions.

autopkgtest							       2007							adt-virt-chroot(1)
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