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Split nix-env and nix-store documentation per-subcommand
Documentation on "classic" commands with many sub-commands are notoriously hard to discover due to lack of overview and anchor links. Additionally the information on common options and environment variables is not accessible offline in man pages, and therefore often overlooked by readers. With this change, each sub-command of nix-store and nix-env gets its own page in the manual (listed in the table of contents), and each own man page. Also, man pages for each subcommand now (again) list common options and environment variables. While this makes each page quite long and some common parameters don't apply, this should still make it easier to navigate as that additional information was not accessible on the command line at all. It is now possible to run 'nix-store --<subcommand> --help` to display help pages for the given subcommand. Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
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Alexander Bantyev
Valentin Gagarin
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84c2c09ec2
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36b059748d
52 changed files with 2171 additions and 1715 deletions
215
doc/manual/src/command-ref/nix-env/query.md
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doc/manual/src/command-ref/nix-env/query.md
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# Name
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`nix-env --query` - display information about packages
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# Synopsis
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`nix-env` {`--query` | `-q`} *names…*
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[`--installed` | `--available` | `-a`]
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[{`--status` | `-s`}]
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[{`--attr-path` | `-P`}]
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[`--no-name`]
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[{`--compare-versions` | `-c`}]
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[`--system`]
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[`--drv-path`]
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[`--out-path`]
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[`--description`]
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[`--meta`]
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[`--xml`]
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[`--json`]
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[{`--prebuilt-only` | `-b`}]
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[{`--attr` | `-A`} *attribute-path*]
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# Description
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The query operation displays information about either the store paths
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that are installed in the current generation of the active profile
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(`--installed`), or the derivations that are available for installation
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in the active Nix expression (`--available`). It only prints information
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about derivations whose symbolic name matches one of *names*.
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The derivations are sorted by their `name` attributes.
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# Source selection
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The following flags specify the set of things on which the query
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operates.
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- `--installed`\
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The query operates on the store paths that are installed in the
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current generation of the active profile. This is the default.
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- `--available`; `-a`\
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The query operates on the derivations that are available in the
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active Nix expression.
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# Queries
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The following flags specify what information to display about the
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selected derivations. Multiple flags may be specified, in which case the
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information is shown in the order given here. Note that the name of the
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derivation is shown unless `--no-name` is specified.
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- `--xml`\
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Print the result in an XML representation suitable for automatic
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processing by other tools. The root element is called `items`, which
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contains a `item` element for each available or installed
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derivation. The fields discussed below are all stored in attributes
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of the `item` elements.
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- `--json`\
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Print the result in a JSON representation suitable for automatic
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processing by other tools.
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- `--prebuilt-only` / `-b`\
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Show only derivations for which a substitute is registered, i.e.,
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there is a pre-built binary available that can be downloaded in lieu
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of building the derivation. Thus, this shows all packages that
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probably can be installed quickly.
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- `--status`; `-s`\
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Print the *status* of the derivation. The status consists of three
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characters. The first is `I` or `-`, indicating whether the
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derivation is currently installed in the current generation of the
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active profile. This is by definition the case for `--installed`,
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but not for `--available`. The second is `P` or `-`, indicating
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whether the derivation is present on the system. This indicates
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whether installation of an available derivation will require the
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derivation to be built. The third is `S` or `-`, indicating whether
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a substitute is available for the derivation.
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- `--attr-path`; `-P`\
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Print the *attribute path* of the derivation, which can be used to
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unambiguously select it using the `--attr` option available in
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commands that install derivations like `nix-env --install`. This
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option only works together with `--available`
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- `--no-name`\
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Suppress printing of the `name` attribute of each derivation.
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- `--compare-versions` / `-c`\
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Compare installed versions to available versions, or vice versa (if
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`--available` is given). This is useful for quickly seeing whether
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upgrades for installed packages are available in a Nix expression. A
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column is added with the following meaning:
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- `<` *version*\
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A newer version of the package is available or installed.
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- `=` *version*\
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At most the same version of the package is available or
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installed.
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- `>` *version*\
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Only older versions of the package are available or installed.
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- `- ?`\
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No version of the package is available or installed.
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- `--system`\
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Print the `system` attribute of the derivation.
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- `--drv-path`\
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Print the path of the [store derivation](@docroot@/glossary.md#gloss-store-derivation).
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- `--out-path`\
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Print the output path of the derivation.
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- `--description`\
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Print a short (one-line) description of the derivation, if
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available. The description is taken from the `meta.description`
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attribute of the derivation.
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- `--meta`\
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Print all of the meta-attributes of the derivation. This option is
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only available with `--xml` or `--json`.
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{{#include ./opt-common.md}}
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{{#include ../opt-common.md}}
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{{#include ./env-common.md}}
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{{#include ../env-common.md}}
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# Examples
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To show installed packages:
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```console
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$ nix-env -q
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bison-1.875c
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docbook-xml-4.2
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firefox-1.0.4
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MPlayer-1.0pre7
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ORBit2-2.8.3
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…
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```
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To show available packages:
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```console
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$ nix-env -qa
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firefox-1.0.7
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GConf-2.4.0.1
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MPlayer-1.0pre7
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ORBit2-2.8.3
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…
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```
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To show the status of available packages:
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```console
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$ nix-env -qas
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-P- firefox-1.0.7 (not installed but present)
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--S GConf-2.4.0.1 (not present, but there is a substitute for fast installation)
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--S MPlayer-1.0pre3 (i.e., this is not the installed MPlayer, even though the version is the same!)
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IP- ORBit2-2.8.3 (installed and by definition present)
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…
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```
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To show available packages in the Nix expression `foo.nix`:
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```console
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$ nix-env -f ./foo.nix -qa
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foo-1.2.3
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```
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To compare installed versions to what’s available:
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```console
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$ nix-env -qc
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...
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acrobat-reader-7.0 - ? (package is not available at all)
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autoconf-2.59 = 2.59 (same version)
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firefox-1.0.4 < 1.0.7 (a more recent version is available)
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...
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```
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To show all packages with “`zip`” in the name:
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```console
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$ nix-env -qa '.*zip.*'
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bzip2-1.0.6
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gzip-1.6
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zip-3.0
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…
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```
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To show all packages with “`firefox`” or “`chromium`” in the name:
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```console
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$ nix-env -qa '.*(firefox|chromium).*'
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chromium-37.0.2062.94
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chromium-beta-38.0.2125.24
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firefox-32.0.3
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firefox-with-plugins-13.0.1
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…
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```
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To show all packages in the latest revision of the Nixpkgs repository:
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```console
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$ nix-env -f https://github.com/NixOS/nixpkgs/archive/master.tar.gz -qa
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```
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