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72 lines
2.0 KiB
Groff
72 lines
2.0 KiB
Groff
.\"
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.\" $Id: namespace.5,v 1.1 1999/02/13 19:56:16 gdr-ftp Exp $
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.\"
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.TH NAMESPACE 5 "7 February 1999" GNO "File Formats"
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.SH NAME
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.BR namespace
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\- map GS/OS partitions to GNO mount points
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.SH SYNOPSIS
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/etc/namespace
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.SH DESCRIPTION
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The
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.BR namespace
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file is parsed by the GNO kernel when the kernel is booting. The mappings
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in this file allow the kernel to provide a continguous hierarchy of
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directories without requiring those directories to be on the same physical
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disk partition. This is similar to the UNIX concept of mount points.
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.LP
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The format of the
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.BR namespace
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file is:
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.nf
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:mountpoint :path:to:real:directory
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.fi
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Comments are not currently allowed in the file.
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It is critical that only colons be used as pathname delimiters in this
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file, and that no trailing colons are specified.
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.SH EXAMPLE
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In this abbreviated example, the /usr directory hierarchy exists on a
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different physical partition than do /bin and /dev:
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.nf
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:bin :disk1:bin
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:dev :disk1:dev
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:usr :disk2:moreGNOstuff:usr
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.fi
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.SH BUGS
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There is currently a limit of about 20 entries in the
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.BR namespace
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file.
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.LP
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Whitespace can appear in the names of neither the mount point nor the
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directory being mounted.
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.LP
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Only a single directory component can be specified for the mount point.
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Therefore, the following would be an illegal entry:
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.nf
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:usr:local :disk3:local
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.fi
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.LP
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One would expect that files existing in the same directory as the GNO
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kernel binary could be referenced relative to the root partition (for
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example, referencing the
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.BR initrc
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file as
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.BR /initrc ).
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This is not permitted; such a reference will cause the relevent system
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call to fail with ENOENT.
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Similarily, one cannot refer to the directory in which the kernel resides as
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.BR / ).
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.LP
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The specified mount points cannot currently be used as home directories.
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For example, root's home directory cannot be /root, where /root is defined
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in /etc/namespace as:
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.nf
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:root :hd3:root
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.fi
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.SH HISTORY
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The
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.BR namespace
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facility first appeared in GNO v2.0.
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