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Update README with install/config information

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Signed-off-by: Lars Hjemli <hjemli@gmail.com>
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Lars Hjemli 2007-01-28 13:18:23 +01:00
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README
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This is an attempt to create a fast web interface for the git scm, using a This is an attempt to create a fast web interface for the git scm, using a
frontside cache to decrease server io-pressure. builtin cache to decrease server io-pressure.
When cgit is invoked, it looks for a cached page matching the request. If no
such cachefile exist (or it has expired), it is (re)generated. Finally, the
cachefile is returned to the client.
If the cachefile has expired, but cgit is unable to lock the cachefile, the Installation
client will get the stale cachefile after all. This is done to favour page
$ $EDITOR Makefile
$ make
$ sudo make install
Note: cgit requires the git and xdiff libraries. Currently, the makefile
expects these files to be found in '../git/libgit.a' and '../git/xdiff/lib.a',
where they will be if you have built git from source in a parallell directory.
Runtime configuration
The file /etc/cgitrc is read by cgit before handling a request. A template
cgitrc is shipped with the sources, and all parameters and default values
can be found in this file.
The cache
When cgit is invoked it looks for a cachefile matching the request and
returns it to the client. If no such cachefile exist (or if it has expired),
the content for the request is written into the proper cachefile before the
file is returned.
If the cachefile has expired but cgit is unable to obtain a lock for it, the
stale cachefile is returned to the client. This is done to favour page
throughput over page freshness. throughput over page freshness.
Also, when a cachefile is generated, a few cache-related http-headers are The generated content contains the complete response to the client, including
created: "Modified" is set to current time(2), while "Expires" is set to the http-headers "Modified" and "Expires".
time(2) + <cachefile TTL> * 60 (unless the TTL is negative, in which case it
is read as "60 * 60 * 24 * 365"). This is done to avoid repeated requests for
already visited pages.
The following cache-related options can be set in /etc/cgitrc:
cache-root=<path> root directory for cache files
cache-root-ttl=<min> TTL for the repo listing page
cache-repo-ttl=<min> TTL for repo summary pages
cache-dynamic-ttl=<min> TTL for pages with symbolic references
cache-static-ttl=<min> TTL for pages with sha1 references
The cachefiles are split into different directories, based on the requested
repository and page:
Repo listing: <cachedir>/index.html
Repo summary: <cachedir>/<repo>/index.html
Repo subpage: <cachedir>/<repo>/<page>/<querystring>.html