guix.texi

@samp{mail-chroot} or auth chroot settings.  If this setting is empty,
"/./" in home dirs are ignored.  WARNING: Never add directories here
which local users can modify, that may lead to root exploit.  Usually
this should be done only if you don't allow shell access for users.
<doc/wiki/Chrooting.txt>.
Defaults to @samp{()}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string mail-chroot
Default chroot directory for mail processes.  This can be overridden
for specific users in user database by giving /./ in user's home
directory (e.g. /home/./user chroots into /home).  Note that usually
there is no real need to do chrooting, Dovecot doesn't allow users to
access files outside their mail directory anyway.  If your home
directories are prefixed with the chroot directory, append "/." to
@samp{mail-chroot}.  <doc/wiki/Chrooting.txt>.
Defaults to @samp{""}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} file-name auth-socket-path
UNIX socket path to master authentication server to find users.
This is used by imap (for shared users) and lda.
Defaults to @samp{"/var/run/dovecot/auth-userdb"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} file-name mail-plugin-dir
Directory where to look up mail plugins.
Defaults to @samp{"/usr/lib/dovecot"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list mail-plugins
List of plugins to load for all services.  Plugins specific to IMAP,
LDA, etc. are added to this list in their own .conf files.
Defaults to @samp{()}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer mail-cache-min-mail-count
The minimum number of mails in a mailbox before updates are done to
cache file.  This allows optimizing Dovecot's behavior to do less disk
writes at the cost of more disk reads.
Defaults to @samp{0}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string mailbox-idle-check-interval
When IDLE command is running, mailbox is checked once in a while to
see if there are any new mails or other changes.  This setting defines
the minimum time to wait between those checks.  Dovecot can also use
dnotify, inotify and kqueue to find out immediately when changes
occur.
Defaults to @samp{"30 secs"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} boolean mail-save-crlf?
Save mails with CR+LF instead of plain LF.  This makes sending those
mails take less CPU, especially with sendfile() syscall with Linux and
FreeBSD.  But it also creates a bit more disk I/O which may just make it
slower.  Also note that if other software reads the mboxes/maildirs,
they may handle the extra CRs wrong and cause problems.
Defaults to @samp{#f}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} boolean maildir-stat-dirs?
By default LIST command returns all entries in maildir beginning
with a dot.  Enabling this option makes Dovecot return only entries
which are directories.  This is done by stat()ing each entry, so it
causes more disk I/O.
 (For systems setting struct @samp{dirent->d_type} this check is free
and it's done always regardless of this setting).
Defaults to @samp{#f}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} boolean maildir-copy-with-hardlinks?
When copying a message, do it with hard links whenever possible.
This makes the performance much better, and it's unlikely to have any
side effects.
Defaults to @samp{#t}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} boolean maildir-very-dirty-syncs?
Assume Dovecot is the only MUA accessing Maildir: Scan cur/
directory only when its mtime changes unexpectedly or when we can't find
the mail otherwise.
Defaults to @samp{#f}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list mbox-read-locks
Which locking methods to use for locking mbox.  There are four
available:

@table @code
@item dotlock
Create <mailbox>.lock file.  This is the oldest and most NFS-safe
solution.  If you want to use /var/mail/ like directory, the users will
need write access to that directory.
@item dotlock-try
Same as dotlock, but if it fails because of permissions or because there
isn't enough disk space, just skip it.
@item fcntl
Use this if possible.  Works with NFS too if lockd is used.
@item flock
May not exist in all systems.  Doesn't work with NFS.
@item lockf
May not exist in all systems.  Doesn't work with NFS.
@end table

You can use multiple locking methods; if you do the order they're declared
in is important to avoid deadlocks if other MTAs/MUAs are using multiple
locking methods as well.  Some operating systems don't allow using some of
them simultaneously.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list mbox-write-locks

@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string mbox-lock-timeout
Maximum time to wait for lock (all of them) before aborting.
Defaults to @samp{"5 mins"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string mbox-dotlock-change-timeout
If dotlock exists but the mailbox isn't modified in any way,
override the lock file after this much time.
Defaults to @samp{"2 mins"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} boolean mbox-dirty-syncs?
When mbox changes unexpectedly we have to fully read it to find out
what changed.  If the mbox is large this can take a long time.  Since
the change is usually just a newly appended mail, it'd be faster to
simply read the new mails.  If this setting is enabled, Dovecot does
this but still safely fallbacks to re-reading the whole mbox file
whenever something in mbox isn't how it's expected to be.  The only real
downside to this setting is that if some other MUA changes message
flags, Dovecot doesn't notice it immediately.  Note that a full sync is
done with SELECT, EXAMINE, EXPUNGE and CHECK commands.
Defaults to @samp{#t}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} boolean mbox-very-dirty-syncs?
Like @samp{mbox-dirty-syncs}, but don't do full syncs even with SELECT,
EXAMINE, EXPUNGE or CHECK commands.  If this is set,
@samp{mbox-dirty-syncs} is ignored.
Defaults to @samp{#f}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} boolean mbox-lazy-writes?
Delay writing mbox headers until doing a full write sync (EXPUNGE
and CHECK commands and when closing the mailbox).  This is especially
useful for POP3 where clients often delete all mails.  The downside is
that our changes aren't immediately visible to other MUAs.
Defaults to @samp{#t}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer mbox-min-index-size
If mbox size is smaller than this (e.g. 100k), don't write index
files.  If an index file already exists it's still read, just not
updated.
Defaults to @samp{0}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer mdbox-rotate-size
Maximum dbox file size until it's rotated.
Defaults to @samp{2000000}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string mdbox-rotate-interval
Maximum dbox file age until it's rotated.  Typically in days.  Day
begins from midnight, so 1d = today, 2d = yesterday, etc.  0 = check
disabled.
Defaults to @samp{"1d"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} boolean mdbox-preallocate-space?
When creating new mdbox files, immediately preallocate their size to
@samp{mdbox-rotate-size}.  This setting currently works only in Linux
with some file systems (ext4, xfs).
Defaults to @samp{#f}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string mail-attachment-dir
sdbox and mdbox support saving mail attachments to external files,
which also allows single instance storage for them.  Other backends
don't support this for now.

WARNING: This feature hasn't been tested much yet.  Use at your own risk.

Directory root where to store mail attachments.  Disabled, if empty.
Defaults to @samp{""}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer mail-attachment-min-size
Attachments smaller than this aren't saved externally.  It's also
possible to write a plugin to disable saving specific attachments
externally.
Defaults to @samp{128000}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string mail-attachment-fs
File system backend to use for saving attachments:
@table @code
@item posix
No SiS done by Dovecot (but this might help FS's own deduplication)
@item sis posix
SiS with immediate byte-by-byte comparison during saving
@item sis-queue posix
SiS with delayed comparison and deduplication.
@end table
Defaults to @samp{"sis posix"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string mail-attachment-hash
Hash format to use in attachment filenames.  You can add any text and
variables: @code{%@{md4@}}, @code{%@{md5@}}, @code{%@{sha1@}},
@code{%@{sha256@}}, @code{%@{sha512@}}, @code{%@{size@}}.  Variables can be
truncated, e.g. @code{%@{sha256:80@}} returns only first 80 bits.
Defaults to @samp{"%@{sha1@}"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer default-process-limit

Defaults to @samp{100}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer default-client-limit

Defaults to @samp{1000}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer default-vsz-limit
Default VSZ (virtual memory size) limit for service processes.
This is mainly intended to catch and kill processes that leak memory
before they eat up everything.
Defaults to @samp{256000000}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string default-login-user
Login user is internally used by login processes.  This is the most
untrusted user in Dovecot system.  It shouldn't have access to anything
at all.
Defaults to @samp{"dovenull"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string default-internal-user
Internal user is used by unprivileged processes.  It should be
separate from login user, so that login processes can't disturb other
processes.
Defaults to @samp{"dovecot"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string ssl?
SSL/TLS support: yes, no, required.  <doc/wiki/SSL.txt>.
Defaults to @samp{"required"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string ssl-cert
PEM encoded X.509 SSL/TLS certificate (public key).
Defaults to @samp{"</etc/dovecot/default.pem"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string ssl-key
PEM encoded SSL/TLS private key.  The key is opened before
dropping root privileges, so keep the key file unreadable by anyone but
root.
Defaults to @samp{"</etc/dovecot/private/default.pem"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string ssl-key-password
If key file is password protected, give the password here.
Alternatively give it when starting dovecot with -p parameter.  Since
this file is often world-readable, you may want to place this setting
instead to a different.
Defaults to @samp{""}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string ssl-ca
PEM encoded trusted certificate authority.  Set this only if you
intend to use @samp{ssl-verify-client-cert? #t}.  The file should
contain the CA certificate(s) followed by the matching
CRL(s).  (e.g. @samp{ssl-ca </etc/ssl/certs/ca.pem}).
Defaults to @samp{""}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} boolean ssl-require-crl?
Require that CRL check succeeds for client certificates.
Defaults to @samp{#t}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} boolean ssl-verify-client-cert?
Request client to send a certificate.  If you also want to require
it, set @samp{auth-ssl-require-client-cert? #t} in auth section.
Defaults to @samp{#f}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string ssl-cert-username-field
Which field from certificate to use for username.  commonName and
x500UniqueIdentifier are the usual choices.  You'll also need to set
@samp{auth-ssl-username-from-cert? #t}.
Defaults to @samp{"commonName"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} hours ssl-parameters-regenerate
How often to regenerate the SSL parameters file.  Generation is
quite CPU intensive operation.  The value is in hours, 0 disables
regeneration entirely.
Defaults to @samp{168}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string ssl-protocols
SSL protocols to use.
Defaults to @samp{"!SSLv2"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string ssl-cipher-list
SSL ciphers to use.
Defaults to @samp{"ALL:!LOW:!SSLv2:!EXP:!aNULL"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string ssl-crypto-device
SSL crypto device to use, for valid values run "openssl engine".
Defaults to @samp{""}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string postmaster-address
Address to use when sending rejection mails.
%d expands to recipient domain.
Defaults to @samp{"postmaster@@%d"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string hostname
Hostname to use in various parts of sent mails (e.g. in Message-Id)
and in LMTP replies.  Default is the system's real hostname@@domain.
Defaults to @samp{""}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} boolean quota-full-tempfail?
If user is over quota, return with temporary failure instead of
bouncing the mail.
Defaults to @samp{#f}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} file-name sendmail-path
Binary to use for sending mails.
Defaults to @samp{"/usr/sbin/sendmail"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string submission-host
If non-empty, send mails via this SMTP host[:port] instead of
sendmail.
Defaults to @samp{""}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string rejection-subject
Subject: header to use for rejection mails.  You can use the same
variables as for @samp{rejection-reason} below.
Defaults to @samp{"Rejected: %s"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string rejection-reason
Human readable error message for rejection mails.  You can use
variables:

@table @code
@item %n
CRLF
@item %r
reason
@item %s
original subject
@item %t
recipient
@end table
Defaults to @samp{"Your message to <%t> was automatically rejected:%n%r"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string recipient-delimiter
Delimiter character between local-part and detail in email
address.
Defaults to @samp{"+"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string lda-original-recipient-header
Header where the original recipient address (SMTP's RCPT TO:
address) is taken from if not available elsewhere.  With dovecot-lda -a
parameter overrides this.  A commonly used header for this is
X-Original-To.
Defaults to @samp{""}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} boolean lda-mailbox-autocreate?
Should saving a mail to a nonexistent mailbox automatically create
it?.
Defaults to @samp{#f}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} boolean lda-mailbox-autosubscribe?
Should automatically created mailboxes be also automatically
subscribed?.
Defaults to @samp{#f}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} non-negative-integer imap-max-line-length
Maximum IMAP command line length.  Some clients generate very long
command lines with huge mailboxes, so you may need to raise this if you
get "Too long argument" or "IMAP command line too large" errors
often.
Defaults to @samp{64000}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string imap-logout-format
IMAP logout format string:
@table @code
@item %i
total number of bytes read from client
@item %o
total number of bytes sent to client.
@end table
Defaults to @samp{"in=%i out=%o"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string imap-capability
Override the IMAP CAPABILITY response.  If the value begins with '+',
add the given capabilities on top of the defaults (e.g. +XFOO XBAR).
Defaults to @samp{""}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string imap-idle-notify-interval
How long to wait between "OK Still here" notifications when client
is IDLEing.
Defaults to @samp{"2 mins"}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string imap-id-send
ID field names and values to send to clients.  Using * as the value
makes Dovecot use the default value.  The following fields have default
values currently: name, version, os, os-version, support-url,
support-email.
Defaults to @samp{""}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string imap-id-log
ID fields sent by client to log.  * means everything.
Defaults to @samp{""}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} space-separated-string-list imap-client-workarounds
Workarounds for various client bugs:

@table @code
@item delay-newmail
Send EXISTS/RECENT new mail notifications only when replying to NOOP and
CHECK commands.  Some clients ignore them otherwise, for example OSX
Mail (<v2.1).  Outlook Express breaks more badly though, without this it
may show user "Message no longer in server" errors.  Note that OE6
still breaks even with this workaround if synchronization is set to
"Headers Only".

@item tb-extra-mailbox-sep
Thunderbird gets somehow confused with LAYOUT=fs (mbox and dbox) and
adds extra @samp{/} suffixes to mailbox names.  This option causes Dovecot to
ignore the extra @samp{/} instead of treating it as invalid mailbox name.

@item tb-lsub-flags
Show \Noselect flags for LSUB replies with LAYOUT=fs (e.g. mbox).
This makes Thunderbird realize they aren't selectable and show them
greyed out, instead of only later giving "not selectable" popup error.
@end table
Defaults to @samp{()}.
@end deftypevr

@deftypevr {@code{dovecot-configuration} parameter} string imap-urlauth-host
Host allowed in URLAUTH URLs sent by client.  "*" allows all.
Defaults to @samp{""}.
@end deftypevr


Whew!  Lots of configuration options.  The nice thing about it though is
that GuixSD has a complete interface to Dovecot's configuration
language.  This allows not only a nice way to declare configurations,
but also offers reflective capabilities as well: users can write code to
inspect and transform configurations from within Scheme.

However, it could be that you just want to get a @code{dovecot.conf} up
and running.  In that case, you can pass an
@code{opaque-dovecot-configuration} as the @code{#:config} parameter to
@code{dovecot-service}.  As its name indicates, an opaque configuration
does not have easy reflective capabilities.

Available @code{opaque-dovecot-configuration} fields are:

@deftypevr {@code{opaque-dovecot-configuration} parameter} package dovecot
The dovecot package.
@end deftypevr

@deftypevr {@code{opaque-dovecot-configuration} parameter} string string
The contents of the @code{dovecot.conf}, as a string.
@end deftypevr

For example, if your @code{dovecot.conf} is just the empty string, you
could instantiate a dovecot service like this:

@example
(dovecot-service #:config
                 (opaque-dovecot-configuration
                  (string "")))
@end example

@subsubheading OpenSMTPD Service

@deffn {Scheme Variable} opensmtpd-service-type
This is the type of the @uref{https://www.opensmtpd.org, OpenSMTPD}
service, whose value should be an @code{opensmtpd-configuration} object
as in this example:

@example
(service opensmtpd-service-type
         (opensmtpd-configuration
           (config-file (local-file "./my-smtpd.conf"))))
@end example
@end deffn

@deftp {Data Type} opensmtpd-configuration
Data type regresenting the configuration of opensmtpd.

@table @asis
@item @code{package} (default: @var{opensmtpd})
Package object of the OpenSMTPD SMTP server.

@item @code{config-file} (default: @var{%default-opensmtpd-file})
File-like object of the OpenSMTPD configuration file to use.  By default
it listens on the loopback network interface, and allows for mail from
users and daemons on the local machine, as well as permitting email to
remote servers.  Run @command{man smtpd.conf} for more information.

@end table
@end deftp

@node Kerberos Services
@subsubsection Kerberos Services
@cindex Kerberos

The @code{(gnu services kerberos)} module provides services relating to
the authentication protocol @dfn{Kerberos}.

@subsubheading Krb5 Service

Programs using a Kerberos client library normally
expect a configuration file in @file{/etc/krb5.conf}.
This service generates such a file from a definition provided in the
operating system declaration.
It does not cause any daemon to be started.

No ``keytab'' files are provided by this service---you must explicitly create them.
This service is known to work with the MIT client library, @code{mit-krb5}.
Other implementations have not been tested.

@defvr {Scheme Variable} krb5-service-type
A service type for Kerberos 5 clients.
@end defvr

@noindent
Here is an example of its use:
@lisp
(service krb5-service-type
         (krb5-configuration
          (default-realm "EXAMPLE.COM")
          (allow-weak-crypto? #t)
          (realms (list
                   (krb5-realm
                    (name "EXAMPLE.COM")
                    (admin-server "groucho.example.com")
                    (kdc "karl.example.com"))
                   (krb5-realm
                    (name "ARGRX.EDU")
                    (admin-server "kerb-admin.argrx.edu")
                    (kdc "keys.argrx.edu"))))))
@end lisp

@noindent
This example provides a Kerberos@tie{}5 client configuration which:
@itemize
@item Recognizes two realms, @i{viz:} ``EXAMPLE.COM'' and ``ARGRX.EDU'', both
of which have distinct administration servers and key distribution centers;
@item Will default to the realm ``EXAMPLE.COM'' if the realm is not explicitly
specified by clients;
@item Accepts services which only support encryption types known to be weak.
@end itemize

The @code{krb5-realm} and @code{krb5-configuration} types have many fields.
Only the most commonly used ones are described here.
For a full list, and more detailed explanation of each, see the MIT
@uref{http://web.mit.edu/kerberos/krb5-devel/doc/admin/conf_files/krb5_conf.html,,krb5.conf}
documentation.


@deftp {Data Type} krb5-realm
@cindex realm, kerberos
@table @asis
@item @code{name}
This field is a string identifying the name of the realm.
A common convention is to use the fully qualified DNS name of your organization,
converted to upper case.

@item @code{admin-server}
This field is a string identifying the host where the administration server is
running.

@item @code{kdc}
This field is a string identifying the key distribution center
for the realm.
@end table
@end deftp

@deftp {Data Type} krb5-configuration

@table @asis
@item @code{allow-weak-crypto?} (default: @code{#f})
If this flag is @code{#t} then services which only offer encryption algorithms
known to be weak will be accepted.

@item @code{default-realm} (default: @code{#f})
This field should be a string identifying the default Kerberos
realm for the client.
You should set this field to the name of your Kerberos realm.
If this value is @code{#f}
then a realm must be specified with every Kerberos principal when invoking programs
such as @command{kinit}.

@item @code{realms}
This should be a non-empty list of @code{krb5-realm} objects, which clients may
access.
Normally, one of them will have a @code{name} field matching the @code{default-realm}
field.
@end table
@end deftp


@subsubheading PAM krb5 Service
@cindex pam-krb5

The @code{pam-krb5} service allows for login authentication and password
management via Kerberos.
You will need this service if you want PAM enabled applications to authenticate
users using Kerberos.

@defvr {Scheme Variable} pam-krb5-service-type
A service type for the Kerberos 5 PAM module.
@end defvr

@deftp {Data Type} pam-krb5-configuration
Data type representing the configuration of the Kerberos 5 PAM module
This type has the following parameters:
@table @asis
@item @code{pam-krb5} (default: @code{pam-krb5})
The pam-krb5 package to use.

@item @code{minimum-uid} (default: @code{1000})
The smallest user ID for which Kerberos authentications should be attempted.
Local accounts with lower values will silently fail to authenticate.
@end table
@end deftp


@node Web Services
@subsubsection Web Services

@cindex web
@cindex www
@cindex HTTP
The @code{(gnu services web)} module provides the following service:

@deffn {Scheme Procedure} nginx-service [#:nginx nginx] @
       [#:log-directory ``/var/log/nginx''] @
       [#:run-directory ``/var/run/nginx''] @
       [#:vhost-list (list (nginx-vhost-configuration))] @
       [#:config-file]

Return a service that runs @var{nginx}, the nginx web server.

The nginx daemon loads its runtime configuration from @var{config-file}.
Log files are written to @var{log-directory} and temporary runtime data
files are written to @var{run-directory}.  For proper operation, these
arguments should match what is in @var{config-file} to ensure that the
directories are created when the service is activated.

As an alternative to using a @var{config-file}, @var{vhost-list} can be
used to specify the list of @dfn{virtual hosts} required on the host.  For
this to work, use the default value for @var{config-file}.

@end deffn

@deftp {Data Type} nginx-vhost-configuration
Data type representing the configuration of an nginx virtual host.
This type has the following parameters:

@table @asis
@item @code{http-port} (default: @code{80})
Nginx will listen for HTTP connection on this port.  Set it at @code{#f} if
nginx should not listen for HTTP (non secure) connection for this
@dfn{virtual host}.

@item @code{https-port} (default: @code{443})
Nginx will listen for HTTPS connection on this port.  Set it at @code{#f} if
nginx should not listen for HTTPS (secure) connection for this @dfn{virtual host}.

Note that nginx can listen for HTTP and HTTPS connections in the same
@dfn{virtual host}.

@item @code{server-name} (default: @code{(list 'default)})
A list of server names this vhost represents. @code{'default} represents the
default vhost for connections matching no other vhost.

@item @code{root} (default: @code{"/srv/http"})
Root of the website nginx will serve.

@item @code{index} (default: @code{(list "index.html")})
Index files to look for when clients ask for a directory.  If it cannot be found,
Nginx will send the list of files in the directory.

@item @code{ssl-certificate} (default: @code{"/etc/nginx/cert.pem"})
Where to find the certificate for secure connections.  Set it to @code{#f} if
you don't have a certificate or you don't want to use HTTPS.

@item @code{ssl-certificate-key} (default: @code{"/etc/nginx/key.pem"})
Where to find the private key for secure connections.  Set it to @code{#f} if
you don't have a key or you don't want to use HTTPS.

@item @code{server-tokens?} (default: @code{#f})
Whether the server should add its configuration to response.

@end table
@end deftp

@node Network File System
@subsubsection Network File System
@cindex NFS

The @code{(gnu services nfs)} module provides the following services,
which are most commonly used in relation to mounting or exporting
directory trees as @dfn{network file systems} (NFS).

@subsubheading RPC Bind Service
@cindex rpcbind

The RPC Bind service provides a facility to map program numbers into
universal addresses.
Many NFS related services use this facility.  Hence it is automatically
started when a dependent service starts.

@defvr {Scheme Variable} rpcbind-service-type
A service type  for the RPC portmapper daemon.
@end defvr


@deftp {Data Type} rpcbind-configuration
Data type representing the configuration of the RPC Bind Service.
This type has the following parameters:
@table @asis
@item @code{rpcbind} (default: @code{rpcbind})
The rpcbind package to use.

@item @code{warm-start?} (default: @code{#t})
If this parameter is @code{#t}, then the daemon will read a
state file on startup thus reloading state information saved by a previous
instance.
@end table
@end deftp


@subsubheading Pipefs Pseudo File System
@cindex pipefs
@cindex rpc_pipefs

The pipefs file system is used to transfer NFS related data
between the kernel and user space programs.

@defvr {Scheme Variable} pipefs-service-type
A service type for the pipefs pseudo file system.
@end defvr

@deftp {Data Type} pipefs-configuration
Data type representing the configuration of the pipefs pseudo file system service.
This type has the following parameters:
@table @asis
@item @code{mount-point} (default: @code{"/var/lib/nfs/rpc_pipefs"})
The directory to which the file system is to be attached.
@end table
@end deftp


@subsubheading GSS Daemon Service
@cindex GSSD
@cindex GSS
@cindex global security system

The @dfn{global security system} (GSS) daemon provides strong security for RPC
based protocols.
Before exchanging RPC requests an RPC client must establish a security
context.  Typically this is done using the Kerberos command @command{kinit}
or automatically at login time using PAM services (@pxref{Kerberos Services}).

@defvr {Scheme Variable} gss-service-type
A service type for the Global Security System (GSS) daemon.
@end defvr

@deftp {Data Type} gss-configuration
Data type representing the configuration of the GSS daemon service.
This type has the following parameters:
@table @asis
@item @code{nfs-utils} (default: @code{nfs-utils})
The package in which the @command{rpc.gssd} command is to be found.

@item @code{pipefs-directory} (default: @code{"/var/lib/nfs/rpc_pipefs"})
The directory where the pipefs file system is mounted.

@end table
@end deftp


@subsubheading IDMAP Daemon Service
@cindex idmapd
@cindex name mapper

The idmap daemon service provides mapping between user IDs and user names.
Typically it is required in order to access file systems mounted via NFSv4.

@defvr {Scheme Variable} idmap-service-type
A service type for the Identity Mapper (IDMAP) daemon.
@end defvr

@deftp {Data Type} idmap-configuration
Data type representing the configuration of the IDMAP daemon service.
This type has the following parameters:
@table @asis
@item @code{nfs-utils} (default: @code{nfs-utils})
The package in which the @command{rpc.idmapd} command is to be found.

@item @code{pipefs-directory} (default: @code{"/var/lib/nfs/rpc_pipefs"})
The directory where the pipefs file system is mounted.

@item @code{domain} (default: @code{#f})
The local NFSv4 domain name.
This must be a string or @code{#f}.
If it is @code{#f} then the daemon will use the host's fully qualified domain name.

@end table
@end deftp

@node Continuous Integration
@subsubsection Continuous Integration

@cindex continuous integration
@uref{https://notabug.org/mthl/cuirass, Cuirass} is a continuous
integration tool for Guix.  It can be used both for development and for
providing substitutes to others (@pxref{Substitutes}).

The @code{(gnu services cuirass)} module provides the following service.

@deffn {Scheme Procedure} cuirass-service @
       [#:config @code{(cuirass-configuration)}]
Return a service that runs @command{cuirass}.

The @var{#:config} keyword argument specifies the configuration for
@command{cuirass}, which must be a @code{<cuirass-configuration>}
object, by default it doesn't provide any build job.  If you want to
provide your own configuration you will most likely use the
@code{cuirass-configuration} special form which returns such objects.
@end deffn

In order to add build jobs you will have to set the
@code{specifications} field.  Here is an example of a cuirass service
defining a build job based on a specification that can be found in
Cuirass source tree.

@example
(let ((spec `((#:name . "guix")
              (#:url . "git://git.savannah.gnu.org/guix.git")
              (#:load-path . ".")
              ;; Adapt to a valid absolute file name.
              (#:file . "/.../cuirass/tests/gnu-system.scm")
              (#:proc . hydra-jobs)
              (#:arguments (subset . "hello"))
              (#:branch . "master"))))
  (cuirass-service #:config (cuirass-configuration
                             (specifications (list spec)))))
@end example

While information related to build jobs are located directly in the
specifications, global settings for the @command{cuirass} process are
accessible in other @code{cuirass-configuration} fields.

@deftp {Data Type} cuirass-configuration
Data type representing the configuration of Cuirass.

@table @asis
@item @code{cache-directory} (default: @code{""})
Location of the repository cache.

@item @code{user} (default: @code{"cuirass"})
Owner of the @code{cuirass} process.

@item @code{group} (default: @code{"cuirass"})
Owner's group of the @code{cuirass} process.

@item @code{interval} (default: @code{60})
Number of seconds between the poll of the repositories followed by the
Cuirass jobs.

@item @code{database} (default: @code{"/var/run/cuirass/cuirass.db"})
Location of sqlite database which contains the build results and previously
added specifications.

@item @code{specifications} (default: @code{'()})
A list of specifications, where a specification is an association list
(@pxref{Associations Lists,,, guile, GNU Guile Reference Manual}) whose
keys are keywords (@code{#:keyword-example}) as shown in the example
above.

@item @code{use-substitutes?} (default: @code{#f})
This allows using substitutes to avoid building every dependencies of a job
from source.

@item @code{one-shot?} (default: @code{#f})
Only evaluate specifications and build derivations once.
@end table
@end deftp

@node Miscellaneous Services
@subsubsection Miscellaneous Services


@cindex lirc
@subsubheading Lirc Service

The @code{(gnu services lirc)} module provides the following service.

@deffn {Scheme Procedure} lirc-service [#:lirc lirc] @
       [#:device #f] [#:driver #f] [#:config-file #f] @
       [#:extra-options '()]
Return a service that runs @url{http://www.lirc.org,LIRC}, a daemon that
decodes infrared signals from remote controls.

Optionally, @var{device}, @var{driver} and @var{config-file}
(configuration file name) may be specified.  See @command{lircd} manual
for details.

Finally, @var{extra-options} is a list of additional command-line options
passed to @command{lircd}.
@end deffn

@cindex spice
@subsubheading Spice Service

The @code{(gnu services spice)} module provides the following service.

@deffn {Scheme Procedure} spice-vdagent-service [#:spice-vdagent]
Returns a service that runs @url{http://www.spice-space.org,VDAGENT}, a daemon
that enables sharing the clipboard with a vm and setting the guest display
resolution when the graphical console window resizes.
@end deffn

@subsubsection Dictionary Services
@cindex dictionary
The @code{(gnu services dict)} module provides the following service:

@deffn {Scheme Procedure} dicod-service [#:config (dicod-configuration)]
Return a service that runs the @command{dicod} daemon, an implementation
of DICT server (@pxref{Dicod,,, dico, GNU Dico Manual}).

The optional @var{config} argument specifies the configuration for
@command{dicod}, which should be a @code{<dicod-configuration>} object, by
default it serves the GNU Collaborative International Dictonary of English.

You can add @command{open localhost} to your @file{~/.dico} file to make
@code{localhost} the default server for @command{dico} client
(@pxref{Initialization File,,, dico, GNU Dico Manual}).
@end deffn

@deftp {Data Type} dicod-configuration
Data type representing the configuration of dicod.

@table @asis
@item @code{dico} (default: @var{dico})
Package object of the GNU Dico dictionary server.

@item @code{interfaces} (default: @var{'("localhost")})
This is the list of IP addresses and ports and possibly socket file
names to listen to (@pxref{Server Settings, @code{listen} directive,,
dico, GNU Dico Manual}).

@item @code{databases} (default: @var{(list %dicod-database:gcide)})
List of @code{<dicod-database>} objects denoting dictionaries to be served.
@end table
@end deftp

@deftp {Data Type} dicod-database
Data type representing a dictionary database.

@table @asis
@item @code{name}