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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chroot

chroot(2)							System Calls Manual							 chroot(2)

Name
       chroot - change root directory

Syntax
       chroot(dirname)
       char *dirname;

Description
       The  dirname is the address of the pathname of a directory, terminated by a null byte.  The system call causes this directory to become the
       root directory (/).

       For a directory to become the root directory, a process must have execute (search) access to the directory.

       This call is restricted to the superuser.

Return Values
       Upon successful completion, a value of 0 is returned.  Otherwise, a value of -1 is returned and errno is set to indicate an error.

Diagnostics
       The system call fails and the root directory is unchanged under the following conditions:

       [ENOTDIR]      A component of the dirname is not a directory.

       [ENAMETOOLONG] A component of a dirname exceeded 255 characters, or an entire dirname exceeded 1023 characters.

       [ENOENT]       The dirname argument points to the name of a directory which does not exist, or to  an  empty  string  and  the  environment
		      defined is POSIX or SYSTEM_FIVE.

       [EFAULT]       The dirname points outside the process's allocated address space.

       [ELOOP]	      Too many symbolic links were encountered in translating the pathname.

       [EIO]	      An I/O error occurred while reading from or writing to the file system.

       [ESTALE]       The  file  handle  given	in the argument is invalid.  The file referred to by that file handle no longer exists or has been
		      revoked.

       [ETIMEDOUT]    A connect request or remote file operation failed because the connected party did not properly respond  after  a	period	of
		      time that is dependent on the communications protocol.

       [EPERM]	      The effective user ID is not that of superuser.

See Also
       chdir(2)

																	 chroot(2)