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acngfs

acngfs

Section: Eduard Bloch (8) Updated: Juni 2008
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NAME

acngfs - Virtual file system for use with apt-cacher-ng  

SYNOPSIS

acngfs BaseURL ProxyHost MountPoint [ -o FUSE Mount Options ]
 

DESCRIPTION

acngfs is a FUSE based filesystem which represents files downloadable via HTTP as part of a local filesystem. It has been developed for very specific purposes and is not intended to be a general purpose HTTP filesystem.

The main use case for acngfs is a situation where:

The files must not be stored on extra space on the user's system (e.g. because of insufficient disk space to make a temporary copy of downloaded files)
Local programs (e.g. apt, dpkg) need to read the packages from a local filesystem
When reading, certain files might need to be fetched in background (or updated) and this process needs to be triggered somehow
Network latency and speed are not relevant, e.g. accessing apt-cacher-ng via localhost connection (with the current implementation, this is very important since all data is transfered twice internally, for technical reasons).
The proxy service can work efficiently with many requests for small data ranges (apt-cacher-ng, for example)
Pattern matching on paths is sufficient to distinguish file and directory names

Typical use may be to let apt/dpkg use package file like they are present on the local filesystem so there is no need to download them. In sources.list, the source appears as a file:/ type URL, like:

deb file:/var/local/acngfs_debian unstable main contrib

and the filesystem backend is prepared with a command like:

/usr/lib/apt-cacher-ng/acngfs http://ftp.uni-kl.de/debian localhost:3142 /var/local/acngfs_debian -o allow_root  

OPTIONS

The command-line options supported by acngfs are:

BaseURL
Remote mirror to be used as real source, like http://ftp2.de.debian.org/debian. NOTE: the mirror subdirectory part (like debian) should be added either to BaseURL or to the path in sources.list, not to both.
ProxyURL
Complete or simplified host and port specification of the proxy server, http://localhost:3142.
mountpoint
Directory representing the URL in the local filesytem.
--help
Print a help summary and additional FUSE application options
FuseOptions
Various options for the FUSE subsystem to control filesystem behaviour. See --help output and FUSE documentation for more details.
 

FILES

/usr/lib/apt-cacher-ng/acngfs
Executable binary documented in this manual page
 

NOTES

Permissions of the files are important when using mounting when sharing data with other users (including root!). To mount as user and let root use the package management tools (apt, dpkg), one may need to use FUSE options like in the following example:

acngfs http://ftp.uni-kl.de/debian http://localhost:3142 /mnt/misc -o allow_root

See FUSE documentation for details about file permissions representation.  

BUGS

Software is still experimental, use at your own risk!

There are natural limitations on capabilities of the FS: no directory reading is allowed (only descending), permissions of files are inherited from the mount point as well as other properties of the filesystem.

Should be used with apt-cacher-ng version 0.2pre2 or newer; otherwise it will flood log files with many requests of small file chunks.  

SEE ALSO

apt-cacher-ng(8), fusermount(1)

For more information on Apt-Cacher NG, read the User Manual which can be found either in the doc/pdf directory of the software source package or installed in the documentation directory of apt-cacher-ng by your distribution.


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
FILES
NOTES
BUGS
SEE ALSO

This document was created by man2html, using the manual pages.
Time: 22:01:12 GMT, April 16, 2011