Why does a fakechroot exist? Post: 303019985

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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

07-11-2018

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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..

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chroot

CHROOT(8)						    BSD System Manager's Manual 						 CHROOT(8)

NAME

     chroot -- change root directory

SYNOPSIS

     chroot [-u -user] [-g -group] [-G -group,group,...] newroot [command]

DESCRIPTION

     The chroot command changes its root directory to the supplied directory newroot and exec's command, if supplied, or an interactive copy of
     your shell.

     If the -u, -g or -G options are given, the user, group and group list of the process are set to these values after the chroot has taken
     place.  See setgid(2), setgroups(2), setuid(2), getgrnam(3) and getpwnam(3).

     Note, command or the shell are run as your real-user-id.

ENVIRONMENT

     The following environment variable is referenced by chroot:

     SHELL  If set, the string specified by SHELL is interpreted as the name of the shell to exec.  If the variable SHELL is not set, /bin/sh is
	    used.

SEE ALSO

     chdir(2), chroot(2), environ(7)

HISTORY

     The chroot utility first appeared in 4.4BSD.

SECURITY CONSIDERATIONS

     chroot should never be installed setuid root, as it would then be possible to exploit the program to gain root privileges.

4.3 Berkeley Distribution					  October 6, 1998					 4.3 Berkeley Distribution