Why does a fakechroot exist? Post: 303020002

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Top Forums UNIX for Beginners Questions & Answers Why does a fakechroot exist? Post 303020002 by Don Cragun on Wednesday 11th of July 2018 11:24:29 PM

07-12-2018

Registered User

I'm confused by a lot of the discussion in this thread. The chroot utility does not in any way, shape, or form change the system's root directory.

The chroot utility (and the underlying chroot() system call) starts a new process with the root directory for that process (and any descendants of that process) set to the directory specified on the command line in that chroot utility invocation.

The root directory of any processes that were running before chroot was invoked (and any descendants of those processes) continue to run with their original root directory.

From what I see in the manual pages, it appears that fakechroot is only available on Debian Linux systems. It also seems that fakechroot does not actually change the root directory of the process it starts, but the library used by the linker that fakechroot uses to link the process it starts fakes the behavior used to run the process as though it had been chrooted in some cases while ignoring chroot behavior in other cases.

I believe the chroot utility and system call are available on all recent UNIX, Linux, and BSD systems.

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named-checkconf

named-checkconf(1)					      General Commands Manual						named-checkconf(1)

NAME

       named-checkconf - named configuration file syntax checking tool

SYNOPSIS

       directory] [configfile]

DESCRIPTION

       is a tool to check the syntax, but not the semantics, of the configuration file for

   Options
       When loading a zone file, read the journal if it exists.

       Change root to
		 directory so that directives in the configuration file are processed as if run by a similarly rooted (see chroot(2)).

       Print the version of the
		 program and exit.

       Perform a check on the loading of the master zone files found in
		 the configuration file.

   Operands
       configfile
		 The configuration file to be checked.	The default is

RETURN VALUE

       sets the exit status.

       Success.

       Errors were detected.

AUTHOR

       was developed by the Internet Systems Consortium (ISC).

FILES

       Default configuration file.

SEE ALSO

       named(1M), chroot(2).

       Requests for Comments (RFC): 1035, available online at

       available online at

       available from the Internet Systems Consortium at

								     BIND 9.3							named-checkconf(1)