index : cgit

cgitrc - runtime configuration for cgit
=======================================

Cgitrc contains all runtime settings for cgit, including the list of git
repositories, formatted as a line-separated list of NAME=VALUE pairs. Blank
lines, and lines starting with '#' or ';', are ignored, and so is a line
carrying no '='. A comment cannot share a line with a setting, since everything
after the '=' belongs to the value. A NAME cgit does not recognise is ignored
with a warning on stderr, which the web server collects in its error log.

The default location of cgitrc, defined at compile time, is /etc/cgitrc. At
runtime, cgit will consult the environment variable CGIT_CONFIG and, if defined,
use its value instead.


Global settings
---------------

about-filter::
	Specifies a command which will be invoked to format the content of about
	pages (both top-level and for each repository). The command will get the
	content of the about-file on its STDIN, the name of the file as the
	first argument, and the STDOUT from the command will be included
	verbatim on the about page. Default value: none. When no about-filter is
	set, the readme is escaped and served as plain text. A bundled Lua
	filter, about-render.lua, renders markdown, man pages and plain text
	when about-filter points at it. See also: "Filter API".

age-file::
	Specifies a path, relative to each repository path, which can be used to
	specify the date and time of the youngest commit in the repository. The
	first line in the file is used as input to the "parse_date" function in
	libgit. Recommended timestamp-format is "yyyy-mm-dd hh:mm:ss". You may
	want to generate this file from a post-receive hook. Default value:
	"info/web/last-modified".

auth-filter::
	Specifies a command that will be invoked for authenticating repository
	access. Receives 12 arguments, with request data on stdin and its
	answer on stdout, as described under "Filter API". If no auth-filter is
	specified, no authentication is performed. Default value: none.

branch-sort::
	Flag which, when set to "age", enables date ordering in the branch ref
	list, and when set to "name" enables ordering by branch name. Default
	value: "name".

cache-about-ttl::
	Number which specifies the time-to-live, in minutes, for the cached
	version of the repository about page. See also: "The cache". Default
	value: "15".

cache-dynamic-ttl::
	Number which specifies the time-to-live, in minutes, for the cached
	version of repository pages accessed without a fixed SHA1. See also:
	"The cache". Default value: "5".

cache-index-ttl::
	Number which specifies the time-to-live, in minutes, for the cached
	version of the repository index page. See also: "The cache". Default
	value: "5".

cache-root::
	Path used to store the cgit cache entries. Default value:
	"/var/cache/cgit". See also: "Macro expansion" and the note on ownership
	under "The cache".

cache-scan-ttl::
	Number which specifies the time-to-live, in minutes, for the result of
	scanning a path for git repositories. See also: "The cache". Default
	value: "15".

cache-size::
	The maximum number of entries in the cgit cache. When set to "0",
	caching is disabled. See also: "The cache". Default value: "0".

cache-snapshot-ttl::
	Number which specifies the time-to-live, in minutes, for the cached
	version of snapshots. A snapshot requested with a fixed object id uses
	"cache-static-ttl" instead, since its content can never change. See
	also: "The cache". Default value: "5".

cache-static-ttl::
	Number which specifies the time-to-live, in minutes, for the cached
	version of repository pages accessed with a fixed SHA1. See also: "The
	cache". Default value: "-1".

cache-summary-ttl::
	Number which specifies the time-to-live, in minutes, for the cached
	version of the repository summary page. See also: "The cache". Default
	value: "5".

case-sensitive-sort::
	Sort items in the repo list case sensitively. Default value: "1". See
	also: repository-sort, section-sort.

clone-prefix::
	Space-separated list of common prefixes which, when combined with a
	repository url, generates valid clone urls for the repository. This
	setting is only used if `repo.clone-url` is unspecified. Default value:
	none.

clone-url::
	Space-separated list of clone-url templates. This setting is only used
	if `repo.clone-url` is unspecified. Default value: none. See also:
	"Macro expansion", "Filter API".

commit-filter::
	Specifies a command which will be invoked to format commit messages. The
	command will get the message on its STDIN, and the STDOUT from the
	command will be included verbatim as the commit message, i.e. this can
	be used to implement bugtracker integration. Default value: none. See
	also: "Filter API".

commit-sort::
	Flag which, when set to "date", enables strict date ordering in the
	commit log, and when set to "topo" enables strict topological ordering.
	If unset, the default ordering of "git log" is used. Default value:
	unset.

css::
	Url which specifies the css document to include in all cgit pages.
	Default value: "/cgit.css". May be given multiple times, each css URL
	path is added in the head section of the document in turn. Setting this
	to an empty string will disable generation of the link to this file in
	the head section.

date-format::
	Format used for the calendar dates in the age columns of the log, refs
	and index pages, both when "enable-relative-dates" is off and when a log
	entry is too old to be shown as an age. Accepts the same names as git's
	--date option: "default", "human", "iso" (or "iso8601"), "iso-strict"
	(or "iso8601-strict"), "raw", "relative", "rfc" (or "rfc2822"), "short"
	and "unix", each of which may carry a "-local" suffix, plus
	"format:<strftime>" for an arbitrary layout. An unrecognised value is
	ignored. Dates elsewhere, such as the author and committer lines on the
	commit page, are always ISO 8601 and are not affected, nor are the exact
	timestamps shown on hover. Default value: "short". See also:
	"local-time".

email-filter::
	Specifies a command which will be invoked to format names and email
	address of committers, authors, and taggers, as represented in various
	places throughout the cgit interface. This command will receive an email
	address and an origin page string as its command line arguments, and the
	text to format on STDIN. It is to write the formatted text back out onto
	STDOUT. Default value: none. See also: "Filter API".

embedded::
	Flag which, when set to "1", will make cgit generate a html fragment
	suitable for embedding in other html pages. Default value: "0". See
	also: "enable-header".

enable-blame::
	Flag which, when set to "1", will allow cgit to provide a "blame" page
	for files, and will make it generate links to that page in appropriate
	places. Default value: "0".

enable-cache-list::
	Flag which, when set to "1", exposes the "ls_cache" page. That page
	lists the cache directory path and the URLs of requests other visitors
	made, so it is disabled by default and should stay off on any instance
	where that disclosure matters. Default value: "0".

enable-commit-graph::
	Flag which, when set to "1", will make cgit print an ASCII-art commit
	history graph to the left of the commit messages in the repository log
	page. Default value: "0".

enable-filter-overrides::
	Flag which, when set to "1", allows the filter settings to be set per
	repository, both as "repo.<filter>" settings in the main cgitrc and
	inside repository-specific cgitrc files. When unset, such settings are
	ignored with a warning. Default value: "0".

enable-follow-links::
	Flag which, when set to "1", allows users to follow a file in the log
	view. Default value: "0".

enable-git-config::
	Flag which, when set to "1", will allow cgit to use git config to set
	any repo specific settings. This option is used in conjunction with
	"scan-path", and must be defined prior, to augment repo-specific
	settings. The keys gitweb.owner, gitweb.category, and gitweb.description
	will map to the cgit keys repo.owner, repo.section, and repo.desc
	respectively. All git config keys that begin with "cgit." will be mapped
	to the corresponding "repo." key in cgit. Default value: "0". See also:
	scan-path, section-from-path.

enable-gitmodules-links::
	Flag which, when set to "1", makes submodule listings derive a link from
	the url recorded in the .gitmodules file at the shown revision, for
	submodules that no module-link template covers. The url is first
	matched, by its trailing path components, against the repositories
	served by this cgit instance, so ssh, file and relative urls still get a
	link when their target is hosted here, and the commit hash then links to
	the target repository's commit page. Otherwise a plain http or https url
	is linked as it is, an ssh url to a well-known public host is rewritten
	to its https form, and any other url is left unlinked and shown as a
	tooltip instead. Default value: "0". See also:
	"repo.enable-gitmodules-links".

enable-header::
	Flag which, when set to "0", makes cgit omit the standard header on all
	pages. Default value: "1". See also: "embedded".

enable-html-serving::
	Flag which, when set to "1", will allow the /plain handler to serve
	mimetype headers that result in the file being treated as HTML by the
	browser. When set to "0", such file types are returned instead as
	text/plain or application/octet-stream. Default value: "0". See also:
	"repo.enable-html-serving".

enable-http-clone::
	If set to "1", cgit will act as a dumb HTTP endpoint for git clones. You
	can add "http://$HTTP_HOST$SCRIPT_NAME/$CGIT_REPO_URL" to clone-url to
	expose this feature. If you use an alternate way of serving git
	repositories, you may wish to disable this. Default value: "1".

enable-index-links::
	Flag which, when set to "1", will make cgit generate extra links for
	each repo in the repository index (specifically, to the "summary",
	"commit" and "tree" pages). Default value: "0".

enable-index-owner::
	Flag which, when set to "1", will make cgit display the owner of each
	repo in the repository index. Default value: "1".

enable-log-filecount::
	Flag which, when set to "1", will make cgit print the number of modified
	files for each commit on the repository log page. Default value: "0".

enable-log-linecount::
	Flag which, when set to "1", will make cgit print the number of added
	and removed lines for each commit on the repository log page. Default
	value: "0".

enable-plain-email::
	Flag which, when set to "0", hides the full author, committer and tagger
	email addresses wherever they would be shown beside the name. Default
	value: "1".

enable-relative-dates::
	Flag which, when set to "1", shows the age columns of the log, refs and
	index pages as an elapsed time such as "3 days" rather than a calendar
	date. When set to "0" those columns always show a date, formatted
	according to "date-format". Default value: "1".

enable-remote-branches::
	Flag which, when set to "1", will make cgit display remote branches in
	the summary and refs views. Default value: "0". See also:
	"repo.enable-remote-branches".

enable-subject-links::
	Flag which, when set to "1", will make cgit use the subject of the
	parent commit as link text when generating links to parent commits in
	commit view. Default value: "0". See also: "repo.enable-subject-links".

enable-tree-group-dirs::
	Flag which, when set to "1", makes the tree view list all directories
	first, sorted, followed by the files. When set to "0", entries appear in
	git's own order, with directories and files intermixed by name. Default
	value: "0".

enable-tree-linenumbers::
	Flag which, when set to "1", will make cgit generate linenumber links
	for plaintext blobs printed in the tree view. Default value: "1".

favicon::
	Url used as link to the icon for cgit. Any path works, but keeping the
	value "/favicon.ico" is still worthwhile, since clients that do not
	parse the page head probe that path directly. Default value:
	"/favicon.ico".

footer::
	The content of the file specified with this option will be included
	verbatim at the bottom of all pages (it replaces the standard "generated
	by..." message). Default value: none.

head-include::
	The content of the file specified with this option will be included
	verbatim in the html HEAD section on all pages. Default value: none.

header::
	The content of the file specified with this option will be included
	verbatim at the top of all pages. Default value: none.

include::
	Name of a configfile to include before the rest of the current
	configfile is parsed. Includes may nest eight levels deep, and anything
	deeper is ignored. Default value: none. See also: "Macro expansion".

js::
	Url which specifies the javascript script document to include in all
	cgit pages. Default value: "/cgit.js". Setting this to an empty string
	will disable generation of the link to this file in the head section.

local-time::
	Flag which, if set to "1", makes cgit print commit and tag times in the
	servers timezone. Default value: "0". See also: "date-format".

logo::
	Url which specifies the source of an image which will be used as a logo
	on all cgit pages. Default value: "/cgit.png".

logo-link::
	Url loaded when clicking on the cgit logo image. If unspecified the
	calculated url of the repository index page will be used. Default value:
	none.

max-atom-items::
	Specifies the number of items to display in atom feeds view. Default
	value: "10".

max-blob-size::
	Specifies the maximum size in KBytes of a blob that cgit will read into
	memory to serve. It caps both the HTML blob view and the raw "plain" and
	"blob" output, and a larger object is refused rather than loaded whole.
	Default value: "10240" (10 MB). Set to "0" to disable the limit.

max-commit-count::
	Specifies the number of entries to list per page in "log" view. Default
	value: "50".

max-diff-files::
	If a commit changes more files than this, the "commit" and "diff" views
	show only the diffstat, where each file links to its own diff page. The
	"rawdiff" and "patch" views are never limited. Default value: "200". Set
	to "0" to always render every file inline.

max-diff-lines::
	If a single file's diff spans more lines than this, the whole-commit
	views print a note in its place linking to the file's own diff page,
	which always renders in full. Default value: "1000". Set to "0" to
	always render oversized files inline.

max-message-length::
	Specifies the maximum number of commit message characters to display in
	"log" view. Default value: "80".

max-patch-count::
	Specifies the maximum number of commits emitted as a series by the
	"patch" view when an explicit revision range is requested. A single
	commit is unaffected. Default value: "50". Set to "0" for no limit.

max-ref-count::
	Specifies the number of branches and tags to list per section on the
	"refs" view, and per page on the dedicated branch and tag pages that its
	overflow links lead to. Default value: "200". Set to "0" to list every
	ref on one page.

max-repo-count::
	Specifies the number of entries to list per page on the repository index
	page. A value of "0" or less shows all repositories without limitation.
	Default value: "50".

max-repodesc-length::
	Specifies the maximum number of repo description characters to display
	on the repository index page. Default value: "80".

max-stats::
	Enable the statistics page, which holds the commits-per-author table,
	and set the coarsest period it offers. Valid values are "week", "month",
	"quarter" and "year", each of which also offers the finer periods before
	it. If unspecified, statistics are disabled. Default value: none. See
	also: "repo.max-stats".

mimetype-file::
	Specifies the file to use for automatic mimetype lookup. If specified
	then this field is used as a fallback when no "mimetype.<ext>" match is
	found. If unspecified then no such lookup is performed. The typical file
	to use on a Linux system is /etc/mime.types. The format of the file must
	comply to:
	- a comment line is an empty line or a line starting with a hash (#),
	  optionally preceded by whitespace
	- a non-comment line starts with the mimetype (like image/png), followed
	  by one or more file extensions (like jpg), all separated by whitespace
	Default value: none. See also: "mimetype.<ext>".

mimetype.<ext>::
	Set the mimetype for the specified filename extension. This is used by
	the `plain` command when returning blob content.

module-link::
	Text which will be used as the formatstring for a hyperlink when a
	submodule is printed in a directory listing. The arguments for the
	formatstring are the name of the submodule directory and the SHA1 of the
	submodule commit. Default value: none.

project-list::
	A list of subdirectories inside of scan-path, relative to it, that
	should be loaded as git repositories. This must be defined prior to
	scan-path. Default value: none. See also: scan-path, "Macro expansion".

readme::
	Text which will be used as default value for "repo.readme". Multiple
	config keys may be specified, and cgit will use the first found file in
	this list. This is useful in conjunction with scan-path. Default value:
	none. See also: scan-path, repo.readme.

remove-suffix::
	If set to "1" and scan-path is enabled, if any repositories are found
	with a suffix of ".git", this suffix will be removed for the url and
	name. This must be defined prior to scan-path. Default value: "0". See
	also: scan-path.

rename-limit::
	Maximum number of files to consider when detecting renames. The value
	"-1" uses the compiletime value in git (for further info, look at `man
	git-diff`). Default value: "-1".

repository-sort::
	The way in which repositories in each section are sorted. Valid values
	are "name" for sorting by the repo name or "age" for sorting by the most
	recently updated repository. Default value: "name". See also: section,
	case-sensitive-sort, section-sort.

robots::
	Text used as content for the "robots" meta-tag. Default value: "index,
	nofollow".

root-desc::
	Text printed below the heading on the repository index page. Default
	value: "a fast webinterface for the git dscm".

root-readme::
	The content of the file specified with this option will be included
	verbatim below the "about" link on the repository index page. Default
	value: none.

root-title::
	Text printed as heading on the repository index page. Default value:
	"Git repository browser".

scan-hidden-path::
	If set to "1" and scan-path is enabled, scan-path will recurse into
	directories whose name starts with a period ('.'). Otherwise, scan-path
	will stay away from such directories (considered as "hidden"). Note that
	this does not apply to the ".git" directory in non-bare repos. This must
	be defined prior to scan-path. Default value: "0". See also: scan-path.

scan-path::
	A path which will be scanned for repositories. If caching is enabled,
	the result will be cached as a cgitrc include-file in the cache
	directory. If project-list has been defined prior to scan-path,
	scan-path loads only the directories listed in the file pointed to by
	project-list. A repository containing a file named "noweb" is skipped,
	the reverse of what "strict-export" checks. Be advised that only the
	global settings taken before the scan-path directive will be applied to
	each repository. That holds for every setting a repository inherits,
	among them section, snapshots, readme, the filters and the enable flags,
	not only the entries that say so explicitly. Default value: none. See
	also: cache-scan-ttl, project-list, strict-export, "Macro expansion".

section::
	The name of the current repository section. All repositories defined
	after this option will inherit the current section name. Default value:
	none.

section-from-path::
	A number which, if defined prior to scan-path, specifies how many path
	elements from each repo path to use as a default section name. If
	negative, cgit will discard the specified number of path elements above
	the repo directory. Default value: "0".

section-sort::
	Flag which, when set to "1", will sort the sections on the repository
	listing by name, along with the repositories within each section. Set
	this flag to "0" to preserve the order in the cgitrc file. Default
	value: "0". See also: section, case-sensitive-sort, repository-sort.

side-by-side-diffs::
	If set to "1" shows side-by-side diffs instead of unidiffs by default.
	Default value: "0".

snapshots::
	Text which specifies the default set of snapshot formats that cgit
	generates links for. The value is a space-separated list of zero or more
	of the values "tar", "tar.gz", "tar.bz2", "tar.lz", "tar.xz", "tar.zst"
	and "zip". The special value "all" enables all snapshot formats. Default
	value: none. All compressors use default settings. Some settings can be
	influenced with environment variables, for example set ZSTD_CLEVEL=10 in
	web server environment for higher (but slower) zstd compression.

source-filter::
	Specifies a command which will be invoked to format plaintext blobs in
	the tree view. The command will get the blob content on its STDIN and
	the name of the blob as its only command line argument. The STDOUT from
	the command will be included verbatim as the blob contents, i.e. this
	can be used to implement e.g. syntax highlighting. When no source-filter
	is configured, cgit serves the text plain. A ready syntax highlighter
	using the Scintillua lexer collection ships as
	custom/extensions/syntax-highlight.lua, see the comments in that file
	for its dependencies. Default value: none. See also: "Filter API".

strict-export::
	Filename which, if specified, needs to be present within the repository
	for cgit to allow access to that repository. This can be used to emulate
	gitweb's EXPORT_OK and STRICT_EXPORT functionality and limit cgit's
	repositories to match those exported by git-daemon. This option must be
	defined prior to scan-path. Default value: none. See also: scan-path.

summary-branches::
	Specifies the number of branches to display in the repository "summary"
	view. Default value: "10".

summary-log::
	Specifies the number of log entries to display in the repository
	"summary" view. Default value: "10".

summary-tags::
	Specifies the number of tags to display in the repository "summary"
	view. Default value: "10".

virtual-root::
	Url which, if specified, will be used as root for all cgit links. It
	will also cause cgit to generate 'virtual urls', i.e. urls like
	'/cgit/tree/README' as opposed to '?url=cgit/tree/README'. Default
	value: none.


Repository settings
-------------------

repo.about-filter::
	Override the default about-filter. Only honoured when
	"enable-filter-overrides" is set. Default value: <about-filter>. See
	also: "Filter API".

repo.branch-sort::
	Flag which, when set to "age", enables date ordering in the branch ref
	list, and when set to "name" enables ordering by branch name. Default
	value: <branch-sort>.

repo.clone-url::
	A list of space-separated urls which can be used to clone this repo.
	Default value: <clone-url>. See also: "Macro expansion".

repo.commit-filter::
	Override the default commit-filter. Only honoured when
	"enable-filter-overrides" is set. Default value: <commit-filter>. See
	also: "Filter API".

repo.commit-sort::
	Flag which, when set to "date", enables strict date ordering in the
	commit log, and when set to "topo" enables strict topological ordering.
	If unset, the default ordering of "git log" is used. Default value:
	<commit-sort>.

repo.defbranch::
	The name of the default branch for this repository. If no such branch
	exists in the repository, the first branch name (when sorted) is used as
	default instead. Default value: branch pointed to by HEAD, or "master"
	if there is no suitable HEAD.

repo.desc::
	The value to show as repository description. When repositories are found
	by scan-path the description file inside the repository is read as a
	fallback, unless it still holds git's "Unnamed repository" boilerplate.
	Default value: "[no description]".

repo.email-filter::
	Override the default email-filter. Only honoured when
	"enable-filter-overrides" is set. Default value: <email-filter>. See
	also: "Filter API".

repo.enable-blame::
	A flag which can be used to override the global setting "enable-blame".
	Default value: <enable-blame>.

repo.enable-commit-graph::
	A flag which can be used to override the global setting
	"enable-commit-graph". Default value: <enable-commit-graph>.

repo.enable-follow-links::
	A flag which can be used to override the global setting
	"enable-follow-links". Default value: <enable-follow-links>.

repo.enable-gitmodules-links::
	A flag which can be used to override the global setting
	"enable-gitmodules-links". Default value: <enable-gitmodules-links>.

repo.enable-html-serving::
	A flag which can be used to override the global setting
	"enable-html-serving". Default value: <enable-html-serving>.

repo.enable-log-filecount::
	A flag which can be used to override the global setting
	"enable-log-filecount". Default value: <enable-log-filecount>.

repo.enable-log-linecount::
	A flag which can be used to override the global setting
	"enable-log-linecount". Default value: <enable-log-linecount>.

repo.enable-remote-branches::
	A flag which can be used to override the global setting
	"enable-remote-branches". Default value: <enable-remote-branches>.

repo.enable-subject-links::
	A flag which can be used to override the global setting
	"enable-subject-links". Default value: <enable-subject-links>.

repo.head-content::
	This value will be added verbatim to the html HEAD section of each page
	displayed for this repo. Default value: none. See also: "head-include".

repo.hide::
	Flag which, when set to "1", hides the repository from the repository
	index. The repository can still be accessed by providing a direct path.
	Default value: "0". See also: "repo.ignore".

repo.ignore::
	Flag which, when set to "1", ignores the repository. The repository is
	not shown in the index and cannot be accessed by providing a direct
	path. Default value: "0". See also: "repo.hide".

repo.logo::
	Url which specifies the source of an image which will be used as a logo
	on this repo's pages. Default value: <logo>.

repo.logo-link::
	Url loaded when clicking on the cgit logo image. If unspecified the
	calculated url of the repository index page will be used. Default value:
	<logo-link>.

repo.max-stats::
	Override the default maximum statistics period. Valid values are equal
	to the values specified for the global "max-stats" setting, and a value
	of "0" disables the statistics page for this repository. Default value:
	<max-stats>.

repo.module-link::
	Text which will be used as the formatstring for a hyperlink when a
	submodule is printed in a directory listing. The arguments for the
	formatstring are the name of the submodule directory and the SHA1 of the
	submodule commit. Default value: <module-link>.

repo.module-link.<path>::
	Text which will be used as the formatstring for a hyperlink when a
	submodule with the specified subdirectory path is printed in a directory
	listing. The only argument for the formatstring is the SHA1 of the
	submodule commit. Default value: none.

repo.name::
	The value to show as repository name. Default value: <repo.url>.

repo.owner::
	A value used to identify the owner of the repository. When repositories
	are found by scan-path the name of the repository directory's owner, as
	recorded in the password database, is used as a fallback. Default value:
	none.

repo.path::
	An absolute path to the repository directory. For non-bare repositories
	this is the .git-directory. Default value: none.

repo.readme::
	A path (relative to <repo.path>) which specifies a file to include
	verbatim as the "About" page for this repo. You may also specify a git
	refspec by head or by hash by prepending the refspec followed by a
	colon. For example, "master:docs/readme.mkd". If the value begins with a
	colon, i.e. ":docs/readme.rst", the head given in the query or the
	default branch of the repository will be used. Sharing any file will
	expose that entire directory tree to the "/about/PATH" endpoints, so be
	sure that there are no non-public files located in the same directory as
	the readme file. Default value: <readme>.

repo.section::
	Override the current section name for this repository. Default value:
	<section>.

repo.snapshot-prefix::
	Prefix to use for snapshot links instead of the repository basename. For
	example, the "linux-stable" repository may wish to set this to "linux"
	so that snapshots are in the format "linux-3.15.4" instead of
	"linux-stable-3.15.4". Default value: <empty> meaning to use the
	repository basename.

repo.snapshots::
	A mask of snapshot formats for this repo that cgit generates links for.
	It is intersected with the global "snapshots" setting, so a repository
	can withhold formats but never offer one the global setting does not.
	Default value: <snapshots>.

repo.source-filter::
	Override the default source-filter. Only honoured when
	"enable-filter-overrides" is set. Default value: <source-filter>. See
	also: "Filter API".

repo.url::
	The relative url used to access the repository. This must be the first
	setting specified for each repo. Default value: none.


Repository-specific cgitrc file
-------------------------------

When the option "scan-path" is used to auto-discover git repositories, cgit will
try to parse the file "cgitrc" within any found repository. Such a repo-specific
config file may contain any of the repo-specific options described above, except
"repo.url" and "repo.path". Additionally, the "filter" options are only
acknowledged in repo-specific config files when "enable-filter-overrides" is set
to "1".

Note: the "repo." prefix is dropped from the option names in repo-specific
config files, e.g. "repo.desc" becomes "desc".


Filter API
----------

By default, filters are separate processes that are executed each time they are
needed. Alternative technologies may be used by prefixing the filter
specification with the relevant string. The available values are:

'exec:'::
	The default "one process per filter" mode.

'lua:'::
	Executes the script using a built-in Lua interpreter. The script is
	loaded once per execution of cgit, and may be called multiple times
	during cgit's lifetime, making it a good choice for repeated filters
	such as the 'email filter'. It responds to three functions:

	'filter_open(argument1, argument2, argument3, ...)'::
		This is called upon activation of the filter for a particular
		set of data.
	'filter_write(buffer)'::
		This is called whenever cgit writes data to the webpage.
	'filter_close()'::
		This is called when the current filtering operation is
		completed. It must return an integer value. Usually 0 indicates
		success.

	Additionally, cgit exposes to the Lua the following built-in functions:

	'html(str)'::
		Writes 'str' to the webpage.
	'html_txt(str)'::
		HTML escapes and writes 'str' to the webpage.
	'html_attr(str)'::
		HTML escapes for an attribute and writes 'str' to the webpage.
	'html_url_path(str)'::
		URL escapes for a path and writes 'str' to the webpage.
	'html_url_arg(str)'::
		URL escapes for an argument and writes 'str' to the webpage.
	'html_include(file)'::
		Includes 'file' in webpage.


Parameters are provided to filters as follows.

about filter::
	This filter is given a single parameter: the filename of the source file
	to filter. The filter can use the filename to determine (for example)
	the type of syntax to follow when formatting the readme file. The about
	text that is to be filtered is available on standard input and the
	filtered text is expected on standard output.

auth filter::
	The authentication filter receives 12 parameters:
	  - filter action, explained below, which specifies which action the
	    filter is called for
	  - http cookie
	  - http method
	  - http query string
	  - http referer
	  - http path
	  - http host
	  - http https flag
	  - cgit repo
	  - cgit page
	  - cgit url
	  - cgit login url
	When the filter action is "body", this filter must write to output the
	HTML for displaying the login form, which POSTs to the login url. When
	the filter action is "authenticate-cookie", this filter must validate
	the http cookie and return a 0 if it is invalid or 1 if it is valid, in
	the exit code / close function. If the filter action is
	"authenticate-post", this filter receives POST'd parameters on standard
	input, and should write a complete CGI response, preferably with a 302
	redirect, and write to output one or more "Set-Cookie" HTTP headers,
	each followed by a newline.

	See `custom/extensions/auth-inline.lua` for a ready to modify example
	that keeps its user list inline, or `custom/extensions/auth-file.lua`
	for the same filter reading its users from files on disk.

commit filter::
	This filter is given no arguments. The commit message text that is to be
	filtered is available on standard input and the filtered text is
	expected on standard output.

email filter::
	This filter is given two parameters: the email address of the relevant
	author and a string indicating the originating page. The filter will
	then receive the text string to format on standard input and is expected
	to write to standard output the formatted text to be included in the
	page.

source filter::
	This filter is given a single parameter: the filename of the source file
	to filter. The filter can use the filename to determine (for example)
	the syntax highlighting mode. The contents of the source file that is to
	be filtered is available on standard input and the filtered contents is
	expected on standard output.


All filters are handed the following environment variables:

- CGIT_REPO_URL (from repo.url)
- CGIT_REPO_NAME (from repo.name)
- CGIT_REPO_PATH (from repo.path)
- CGIT_REPO_OWNER (from repo.owner)
- CGIT_REPO_DEFBRANCH (from repo.defbranch)
- CGIT_REPO_SECTION (from repo.section)
- CGIT_REPO_CLONE_URL (from repo.clone-url)

If a setting is not defined for a repository and the corresponding global
setting is also not defined (if applicable), then the corresponding environment
variable will be unset.


Macro expansion
---------------

The following cgitrc options support a simple macro expansion feature, where
tokens prefixed with "$" are replaced with the value of a similarly named
environment variable:

- cache-root
- include
- project-list
- scan-path

Macro expansion will also happen on the content of $CGIT_CONFIG, if defined.

The set of available variables is not fixed by cgit. The options above are
expanded while the configuration is parsed, against whatever environment the web
server hands the cgit process, so any variable the server sets can be used. A
CGI server provides the standard request variables, among them $HTTP_HOST,
$HTTPS, $PATH_INFO, $QUERY_STRING, $REQUEST_METHOD, $SCRIPT_NAME, $SERVER_NAME
and $SERVER_PORT, and server directives such as SetEnv (Apache), fastcgi_param
(nginx) or setenv.add-environment (lighttpd) can add anything else. Note that
cgit unsets $HOME and $XDG_CONFIG_HOME before reading its configuration, so
those two never expand.

One usage of this feature is virtual hosting, which in its simplest form can be
accomplished by adding the following line to /etc/cgitrc:

	include=/etc/cgitrc.d/$HTTP_HOST

The following options are expanded later, during request processing, and
additionally support the seven CGIT_REPO_* variables defined in "Filter API":

- clone-url
- repo.clone-url


The cache
---------

All cache ttl values are in minutes. Negative ttl values indicate that a page
type will never expire, and thus the first time a URL is accessed, the result
will be cached indefinitely, even if the underlying git repository changes.
Conversely, when a ttl value is zero, the cache is disabled for that particular
page type.

The cache directory holds one file per slot plus transient lock files, all
created by cgit itself. Create the directory ahead of time, owned by the account
the web server runs cgit as, with mode 0700. cgit creates its files by name
without guarding against links planted beside them, so a directory other
accounts can write to would let those accounts redirect the writes. A directory
other accounts can read exposes every cached page along with the URLs visitors
asked for.


Signatures
----------

Cgit can host .asc signatures corresponding to various snapshot formats, through
use of git notes. For example, the following command may be used to add a
signature to a .tar.xz archive:

    git notes --ref=refs/notes/signatures/tar.xz add -C "$(
        gpg --output - --armor --detach-sign cgit-1.1.tar.xz |
        git hash-object -w --stdin
    )" v1.1

If it is instead desirable to attach a signature of the underlying .tar, this
will be linked, as a special case, beside a .tar.* link that does not have its
own signature. For example, a signature of a tarball of the latest tag might be
added with a similar command:

    tag="$(git describe --abbrev=0)"
    git notes --ref=refs/notes/signatures/tar add -C "$(
        git archive --format tar --prefix "cgit-${tag#v}/" "$tag" |
        gpg --output - --armor --detach-sign |
        git hash-object -w --stdin
    )" "$tag"

Since git-archive(1) is expected to produce stable output between versions, this
allows one to generate a long-term signature of the contents of a given tag.