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doc: Use @env for environment variables. 

* doc/guix.texi (Binary Installation):
(Build Environment Setup):
(Invoking guix-daemon):
(Application Setup):
(After System Installation):
(Invoking guix package):
(Proxy Settings):
(Invoking guix environment):
(Packages for C Development):
(Package Modules):
(Build Systems):
(The Store):
(Common Build Options):
(Invoking guix download):
(Invoking guix refresh):
(Using the Configuration System):
(Locales):
(Base Services):
(Networking Services):
(Sound Services):
(Continuous Integration):
(PAM Mount Service):
(X.509 Certificates): Use @env instead of @code for environment variables.
wip-gnome3.36
Nicolas Goaziou 2 years ago
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@ -633,7 +633,7 @@ where @command{guix pull} will install updates (@pxref{Invoking guix pull}):
~root/.config/guix/current
@end example
Source @file{etc/profile} to augment @code{PATH} and other relevant
Source @file{etc/profile} to augment @env{PATH} and other relevant
environment variables:
@example
@ -1004,15 +1004,15 @@ a writable @file{/tmp} directory.
@end itemize
You can influence the directory where the daemon stores build trees
@i{via} the @code{TMPDIR} environment variable. However, the build tree
@i{via} the @env{TMPDIR} environment variable. However, the build tree
within the chroot is always called @file{/tmp/guix-build-@var{name}.drv-0},
where @var{name} is the derivation name---e.g., @code{coreutils-8.24}.
This way, the value of @code{TMPDIR} does not leak inside build
This way, the value of @env{TMPDIR} does not leak inside build
environments, which avoids discrepancies in cases where build processes
capture the name of their build tree.
@vindex http_proxy
The daemon also honors the @code{http_proxy} environment variable for
The daemon also honors the @env{http_proxy} environment variable for
HTTP downloads it performs, be it for fixed-output derivations
(@pxref{Derivations}) or for substitutes (@pxref{Substitutes}).
@ -1350,7 +1350,7 @@ etc. This helps achieve reproducible builds (@pxref{Features}).
When the daemon performs a build on behalf of the user, it creates a
build directory under @file{/tmp} or under the directory specified by
its @code{TMPDIR} environment variable. This directory is shared with
its @env{TMPDIR} environment variable. This directory is shared with
the container for the duration of the build, though within the container,
the build tree is always called @file{/tmp/guix-build-@var{name}.drv-0}.
@ -1413,7 +1413,7 @@ The default value is @code{0}, but it may be overridden by clients, such
as the @option{--cores} option of @command{guix build} (@pxref{Invoking
guix build}).
The effect is to define the @code{NIX_BUILD_CORES} environment variable
The effect is to define the @env{NIX_BUILD_CORES} environment variable
in the build process, which can then use it to exploit internal
parallelism---for instance, by running @code{make -j$NIX_BUILD_CORES}.
@ -1569,8 +1569,8 @@ Listen for TCP connections on the network interface corresponding to
This option can be repeated multiple times, in which case
@command{guix-daemon} accepts connections on all the specified
endpoints. Users can tell client commands what endpoint to connect to
by setting the @code{GUIX_DAEMON_SOCKET} environment variable
(@pxref{The Store, @code{GUIX_DAEMON_SOCKET}}).
by setting the @env{GUIX_DAEMON_SOCKET} environment variable
(@pxref{The Store, @env{GUIX_DAEMON_SOCKET}}).
@quotation Note
The daemon protocol is @emph{unauthenticated and unencrypted}. Using
@ -1602,7 +1602,7 @@ get everything in place. Here are some of them.
@vindex GUIX_LOCPATH
Packages installed @i{via} Guix will not use the locale data of the
host system. Instead, you must first install one of the locale packages
available with Guix and then define the @code{GUIX_LOCPATH} environment
available with Guix and then define the @env{GUIX_LOCPATH} environment
variable:
@example
@ -1615,19 +1615,19 @@ locales supported by the GNU@tie{}libc and weighs in at around
917@tie{}MiB. Alternatively, the @code{glibc-utf8-locales} is smaller but
limited to a few UTF-8 locales.
The @code{GUIX_LOCPATH} variable plays a role similar to @code{LOCPATH}
(@pxref{Locale Names, @code{LOCPATH},, libc, The GNU C Library Reference
The @env{GUIX_LOCPATH} variable plays a role similar to @env{LOCPATH}
(@pxref{Locale Names, @env{LOCPATH},, libc, The GNU C Library Reference
Manual}). There are two important differences though:
@enumerate
@item
@code{GUIX_LOCPATH} is honored only by the libc in Guix, and not by the libc
provided by foreign distros. Thus, using @code{GUIX_LOCPATH} allows you
@env{GUIX_LOCPATH} is honored only by the libc in Guix, and not by the libc
provided by foreign distros. Thus, using @env{GUIX_LOCPATH} allows you
to make sure the programs of the foreign distro will not end up loading
incompatible locale data.
@item
libc suffixes each entry of @code{GUIX_LOCPATH} with @code{/X.Y}, where
libc suffixes each entry of @env{GUIX_LOCPATH} with @code{/X.Y}, where
@code{X.Y} is the libc version---e.g., @code{2.22}. This means that,
should your Guix profile contain a mixture of programs linked against
different libc version, each libc version will only try to load locale
@ -1760,7 +1760,7 @@ information.
When you install Emacs packages with Guix, the Elisp files are placed
under the @file{share/emacs/site-lisp/} directory of the profile in
which they are installed. The Elisp libraries are made available to
Emacs through the @code{EMACSLOADPATH} environment variable, which is
Emacs through the @env{EMACSLOADPATH} environment variable, which is
set when installing Emacs itself.
Additionally, autoload definitions are automatically evaluated at the
@ -2456,7 +2456,7 @@ your system includes the latest security updates (@pxref{Security Updates}).
@quotation Note
@cindex sudo vs. @command{guix pull}
Note that @command{sudo guix} runs your user's @command{guix} command and
@emph{not} root's, because @command{sudo} leaves @code{PATH} unchanged. To
@emph{not} root's, because @command{sudo} leaves @env{PATH} unchanged. To
explicitly run root's @command{guix}, type @command{sudo -i guix @dots{}}.
The difference matters here, because @command{guix pull} updates
@ -2733,7 +2733,7 @@ passes it @i{via} the @option{--manifest} option
For each user, a symlink to the user's default profile is automatically
created in @file{$HOME/.guix-profile}. This symlink always points to the
current generation of the user's default profile. Thus, users can add
@file{$HOME/.guix-profile/bin} to their @code{PATH} environment
@file{$HOME/.guix-profile/bin} to their @env{PATH} environment
variable, and so on.
@cindex search paths
If you are not using Guix System, consider adding the
@ -2977,7 +2977,7 @@ $ guix package -p bar -i guile-json
$ guix package -p foo -p bar --search-paths
@end example
The last command above reports about the @code{GUILE_LOAD_PATH}
The last command above reports about the @env{GUILE_LOAD_PATH}
variable, even though, taken individually, neither @file{foo} nor
@file{bar} would lead to that recommendation.
@ -3216,7 +3216,7 @@ Options}). It also supports package transformation options, such as
@option{--with-source} (@pxref{Package Transformation Options}).
However, note that package transformations are lost when upgrading; to
preserve transformations across upgrades, you should define your own
package variant in a Guile module and add it to @code{GUIX_PACKAGE_PATH}
package variant in a Guile module and add it to @env{GUIX_PACKAGE_PATH}
(@pxref{Defining Packages}).
@node Substitutes
@ -3377,10 +3377,10 @@ authenticating bindings between domain names and public keys.)
@vindex http_proxy
Substitutes are downloaded over HTTP or HTTPS.
The @code{http_proxy} environment
The @env{http_proxy} environment
variable can be set in the environment of @command{guix-daemon} and is
honored for downloads of substitutes. Note that the value of
@code{http_proxy} in the environment where @command{guix build},
@env{http_proxy} in the environment where @command{guix build},
@command{guix package}, and other client commands are run has
@emph{absolutely no effect}.
@ -4802,7 +4802,7 @@ Another typical use case for containers is to run security-sensitive
applications such as a web browser. To run Eolie, we must expose and
share some files and directories; we include @code{nss-certs} and expose
@file{/etc/ssl/certs/} for HTTPS authentication; finally we preserve the
the @code{DISPLAY} environment variable since containerized graphical
the @env{DISPLAY} environment variable since containerized graphical
applications won't display without it.
@example
@ -4927,9 +4927,9 @@ guix environment --pure --preserve=^SLURM --ad-hoc openmpi @dots{} \
@end example
This example runs @command{mpirun} in a context where the only environment
variables defined are @code{PATH}, environment variables whose name starts
with @code{SLURM}, as well as the usual ``precious'' variables (@code{HOME},
@code{USER}, etc.)
variables defined are @env{PATH}, environment variables whose name starts
with @samp{SLURM}, as well as the usual ``precious'' variables (@env{HOME},
@env{USER}, etc.)
@item --search-paths
Display the environment variable definitions that make up the
@ -5372,7 +5372,7 @@ The wrapper's purpose is to inspect the @code{-L} and @code{-l} switches
passed to the linker, add corresponding @code{-rpath} arguments, and
invoke the actual linker with this new set of arguments. You can instruct the
wrapper to refuse to link against libraries not in the store by setting the
@code{GUIX_LD_WRAPPER_ALLOW_IMPURITIES} environment variable to @code{no}.
@env{GUIX_LD_WRAPPER_ALLOW_IMPURITIES} environment variable to @code{no}.
@ -5445,7 +5445,7 @@ names---e.g., @code{(my-packages emacs)}@footnote{Note that the file
name and module name must match. For instance, the @code{(my-packages
emacs)} module must be stored in a @file{my-packages/emacs.scm} file
relative to the load path specified with @option{--load-path} or
@code{GUIX_PACKAGE_PATH}. @xref{Modules and the File System,,,
@env{GUIX_PACKAGE_PATH}. @xref{Modules and the File System,,,
guile, GNU Guile Reference Manual}, for details.}. There are two ways to make
these package definitions visible to the user interfaces:
@ -5453,7 +5453,7 @@ these package definitions visible to the user interfaces:
@item
By adding the directory containing your package modules to the search path
with the @code{-L} flag of @command{guix package} and other commands
(@pxref{Common Build Options}), or by setting the @code{GUIX_PACKAGE_PATH}
(@pxref{Common Build Options}), or by setting the @env{GUIX_PACKAGE_PATH}
environment variable described below.
@item
@ -5463,7 +5463,7 @@ modules. @xref{Channels}, for more information on how to define and use
channels.
@end enumerate
@code{GUIX_PACKAGE_PATH} works similarly to other search path variables:
@env{GUIX_PACKAGE_PATH} works similarly to other search path variables:
@defvr {Environment Variable} GUIX_PACKAGE_PATH
This is a colon-separated list of directories to search for additional
@ -6418,7 +6418,7 @@ The phase @code{glib-or-gtk-wrap} ensures that programs in
@file{bin/} are able to find GLib ``schemas'' and
@uref{https://developer.gnome.org/gtk3/stable/gtk-running.html, GTK+
modules}. This is achieved by wrapping the programs in launch scripts
that appropriately set the @code{XDG_DATA_DIRS} and @code{GTK_PATH}
that appropriately set the @env{XDG_DATA_DIRS} and @env{GTK_PATH}
environment variables.
It is possible to exclude specific package outputs from that wrapping
@ -6533,7 +6533,7 @@ Note that most OCaml packages assume they will be installed in the same
directory as OCaml, which is not what we want in guix. In particular, they
will install @file{.so} files in their module's directory, which is usually
fine because it is in the OCaml compiler directory. In guix though, these
libraries cannot be found and we use @code{CAML_LD_LIBRARY_PATH}. This
libraries cannot be found and we use @env{CAML_LD_LIBRARY_PATH}. This
variable points to @file{lib/ocaml/site-lib/stubslibs} and this is where
@file{.so} libraries should be installed.
@end defvr
@ -6545,7 +6545,7 @@ packages, which consists in running @code{python setup.py build} and
then @code{python setup.py install --prefix=/gnu/store/@dots{}}.
For packages that install stand-alone Python programs under @code{bin/},
it takes care of wrapping these programs so that their @code{PYTHONPATH}
it takes care of wrapping these programs so that their @env{PYTHONPATH}
environment variable points to all the Python libraries they depend on.
Which Python package is used to perform the build can be specified with
@ -6619,10 +6619,10 @@ This phase is added after the @code{install} phase.
@defvr {Scheme Variable} r-build-system
This variable is exported by @code{(guix build-system r)}. It
implements the build procedure used by @uref{https://r-project.org, R}
packages, which essentially is little more than running @code{R CMD
packages, which essentially is little more than running @samp{R CMD
INSTALL --library=/gnu/store/@dots{}} in an environment where
@code{R_LIBS_SITE} contains the paths to all R package inputs. Tests
are run after installation using the R function
@env{R_LIBS_SITE} contains the paths to all R package inputs. Tests are
run after installation using the R function
@code{tools::testInstalledPackage}.
@end defvr
@ -6647,7 +6647,7 @@ with @code{#:zef} or removed by passing @code{#f} to the
@defvr {Scheme Variable} texlive-build-system
This variable is exported by @code{(guix build-system texlive)}. It is
used to build TeX packages in batch mode with a specified engine. The
build system sets the @code{TEXINPUTS} variable to find all TeX source
build system sets the @env{TEXINPUTS} variable to find all TeX source
files in the inputs.
By default it runs @code{luatex} on all files ending on @code{ins}. A
@ -6900,7 +6900,7 @@ The @code{(guix store)} module provides procedures to connect to the
daemon, and to perform RPCs. These are described below. By default,
@code{open-connection}, and thus all the @command{guix} commands,
connect to the local daemon or to the URI specified by the
@code{GUIX_DAEMON_SOCKET} environment variable.
@env{GUIX_DAEMON_SOCKET} environment variable.
@defvr {Environment Variable} GUIX_DAEMON_SOCKET
When set, the value of this variable should be a file name or a URI
@ -6940,7 +6940,7 @@ instruct it to listen for TCP connections (@pxref{Invoking guix-daemon,
@cindex SSH access to build daemons
These URIs allow you to connect to a remote daemon over SSH. This
feature requires Guile-SSH (@pxref{Requirements}) and a working
@code{guile} binary in @code{PATH} on the destination machine. It
@command{guile} binary in @env{PATH} on the destination machine. It
supports public key and GSSAPI authentication. A typical URL might look
like this:
@ -8302,7 +8302,7 @@ build issues.
This option implies @option{--no-offload}, and it has no effect when
connecting to a remote daemon with a @code{guix://} URI (@pxref{The
Store, the @code{GUIX_DAEMON_SOCKET} variable}).
Store, the @env{GUIX_DAEMON_SOCKET} variable}).
@item --keep-going
@itemx -k
@ -8413,7 +8413,7 @@ derivations)} module.
In addition to options explicitly passed on the command line,
@command{guix build} and other @command{guix} commands that support
building honor the @code{GUIX_BUILD_OPTIONS} environment variable.
building honor the @env{GUIX_BUILD_OPTIONS} environment variable.
@defvr {Environment Variable} GUIX_BUILD_OPTIONS
Users can define this variable to a list of command line options that
@ -8949,7 +8949,7 @@ GnuTLS-Guile}, for more information.
@command{guix download} verifies HTTPS server certificates by loading
the certificates of X.509 authorities from the directory pointed to by
the @code{SSL_CERT_DIR} environment variable (@pxref{X.509
the @env{SSL_CERT_DIR} environment variable (@pxref{X.509
Certificates}), unless @option{--no-check-certificate} is used.
The following options are available:
@ -9782,7 +9782,7 @@ GitHub will eventually refuse to answer any further API requests. By
default 60 API requests per hour are allowed, and a full refresh on all
GitHub packages in Guix requires more than this. Authentication with
GitHub through the use of an API token alleviates these limits. To use
an API token, set the environment variable @code{GUIX_GITHUB_TOKEN} to a
an API token, set the environment variable @env{GUIX_GITHUB_TOKEN} to a
token procured from @uref{https://github.com/settings/tokens} or
otherwise.
@ -11098,7 +11098,7 @@ configuration options.
@vindex %base-packages
The @code{packages} field lists packages that will be globally visible
on the system, for all user accounts---i.e., in every user's @code{PATH}
on the system, for all user accounts---i.e., in every user's @env{PATH}
environment variable---in addition to the per-user profiles
(@pxref{Invoking guix package}). The @code{%base-packages} variable
provides all the tools one would expect for basic user and administrator
@ -12123,8 +12123,8 @@ The compiled locale definitions are available at
@file{/run/current-system/locale/X.Y}, where @code{X.Y} is the libc
version, which is the default location where the GNU@tie{}libc provided
by Guix looks for locale data. This can be overridden using the
@code{LOCPATH} environment variable (@pxref{locales-and-locpath,
@code{LOCPATH} and locale packages}).
@env{LOCPATH} environment variable (@pxref{locales-and-locpath,
@env{LOCPATH} and locale packages}).
The @code{locale-definition} form is provided by the @code{(gnu system
locale)} module. Details are given below.
@ -12182,7 +12182,7 @@ read locale data produced with libc 2.22; worse, that program
data@footnote{Versions 2.23 and later of GNU@tie{}libc will simply skip
the incompatible locale data, which is already an improvement.}.
Similarly, a program linked against libc 2.22 can read most, but not
all, of the locale data from libc 2.21 (specifically, @code{LC_COLLATE}
all, of the locale data from libc 2.21 (specifically, @env{LC_COLLATE}
data is incompatible); thus calls to @code{setlocale} may fail, but
programs will not abort.
@ -12192,8 +12192,8 @@ be using a libc version different from the one the system administrator
used to build the system-wide locale data.
Fortunately, unprivileged users can also install their own locale data
and define @var{GUIX_LOCPATH} accordingly (@pxref{locales-and-locpath,
@code{GUIX_LOCPATH} and locale packages}).
and define @env{GUIX_LOCPATH} accordingly (@pxref{locales-and-locpath,
@env{GUIX_LOCPATH} and locale packages}).
Still, it is best if the system-wide locale data at
@file{/run/current-system/locale} is built for all the libc versions
@ -12480,7 +12480,7 @@ A string containing a comma-separated list of one or more baud rates, in
descending order.
@item @code{term} (default: @code{#f})
A string containing the value used for the @code{TERM} environment
A string containing the value used for the @env{TERM} environment
variable.
@item @code{eight-bits?} (default: @code{#f})
@ -14313,7 +14313,7 @@ List of strings describing which environment variables may be exported.
Each string gets on its own line. See the @code{AcceptEnv} option in
@code{man sshd_config}.
This example allows ssh-clients to export the @code{COLORTERM} variable.
This example allows ssh-clients to export the @env{COLORTERM} variable.
It is set by terminal emulators, which support colors. You can use it in
your shell's resource file to enable colors for the prompt and commands
if this variable is set.
@ -16405,8 +16405,8 @@ via @code{pulseaudio-configuration}, see below.
@quotation Warning
This service overrides per-user configuration files. If you want
PulseAudio to honor configuraton files in @file{~/.config/pulse} you
have to unset the environment variables @code{PULSE_CONFIG} and
@code{PULSE_CLIENTCONFIG} in your @file{~/.bash_profile}.
have to unset the environment variables @env{PULSE_CONFIG} and
@env{PULSE_CLIENTCONFIG} in your @file{~/.bash_profile}.
@end quotation
@quotation Warning
@ -22713,7 +22713,7 @@ To add build jobs, you have to set the @code{specifications} field of the
configuration. Here is an example of a service that polls the Guix repository
and builds the packages from a manifest. Some of the packages are defined in
the @code{"custom-packages"} input, which is the equivalent of
@code{GUIX_PACKAGE_PATH}.
@env{GUIX_PACKAGE_PATH}.
@lisp
(define %cuirass-specs
@ -25530,7 +25530,7 @@ for anyone at login:
Some @code{volume} elements must be added to automatically mount volumes
at login. Here's an example allowing the user @code{alice} to mount her
encrypted @code{HOME} directory and allowing the user @code{bob} to mount
encrypted @env{HOME} directory and allowing the user @code{bob} to mount
the partition where he stores his data:
@lisp
@ -26181,10 +26181,10 @@ Unprivileged users, including users of Guix on a foreign distro,
can also install their own certificate package in
their profile. A number of environment variables need to be defined so
that applications and libraries know where to find them. Namely, the
OpenSSL library honors the @code{SSL_CERT_DIR} and @code{SSL_CERT_FILE}
OpenSSL library honors the @env{SSL_CERT_DIR} and @env{SSL_CERT_FILE}
variables. Some applications add their own environment variables; for
instance, the Git version control system honors the certificate bundle
pointed to by the @code{GIT_SSL_CAINFO} environment variable. Thus, you
pointed to by the @env{GIT_SSL_CAINFO} environment variable. Thus, you
would typically run something like:
@example
@ -26194,7 +26194,7 @@ export SSL_CERT_FILE="$HOME/.guix-profile/etc/ssl/certs/ca-certificates.crt"
export GIT_SSL_CAINFO="$SSL_CERT_FILE"
@end example
As another example, R requires the @code{CURL_CA_BUNDLE} environment
As another example, R requires the @env{CURL_CA_BUNDLE} environment
variable to point to a certificate bundle, so you would have to run
something like this:

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