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diff --git a/doc/manual/src/command-ref/nix-env/query.md b/doc/manual/src/command-ref/nix-env/query.md new file mode 100644 index 000000000..18f0ee210 --- /dev/null +++ b/doc/manual/src/command-ref/nix-env/query.md @@ -0,0 +1,215 @@ +# Name + +`nix-env --query` - display information about packages + +# Synopsis + +`nix-env` {`--query` | `-q`} *names…* + [`--installed` | `--available` | `-a`] + [{`--status` | `-s`}] + [{`--attr-path` | `-P`}] + [`--no-name`] + [{`--compare-versions` | `-c`}] + [`--system`] + [`--drv-path`] + [`--out-path`] + [`--description`] + [`--meta`] + [`--xml`] + [`--json`] + [{`--prebuilt-only` | `-b`}] + [{`--attr` | `-A`} *attribute-path*] + +# Description + +The query operation displays information about either the store paths +that are installed in the current generation of the active profile +(`--installed`), or the derivations that are available for installation +in the active Nix expression (`--available`). It only prints information +about derivations whose symbolic name matches one of *names*. + +The derivations are sorted by their `name` attributes. + +# Source selection + +The following flags specify the set of things on which the query +operates. + + - `--installed`\ + The query operates on the store paths that are installed in the + current generation of the active profile. This is the default. + + - `--available`; `-a`\ + The query operates on the derivations that are available in the + active Nix expression. + +# Queries + +The following flags specify what information to display about the +selected derivations. Multiple flags may be specified, in which case the +information is shown in the order given here. Note that the name of the +derivation is shown unless `--no-name` is specified. + + - `--xml`\ + Print the result in an XML representation suitable for automatic + processing by other tools. The root element is called `items`, which + contains a `item` element for each available or installed + derivation. The fields discussed below are all stored in attributes + of the `item` elements. + + - `--json`\ + Print the result in a JSON representation suitable for automatic + processing by other tools. + + - `--prebuilt-only` / `-b`\ + Show only derivations for which a substitute is registered, i.e., + there is a pre-built binary available that can be downloaded in lieu + of building the derivation. Thus, this shows all packages that + probably can be installed quickly. + + - `--status`; `-s`\ + Print the *status* of the derivation. The status consists of three + characters. The first is `I` or `-`, indicating whether the + derivation is currently installed in the current generation of the + active profile. This is by definition the case for `--installed`, + but not for `--available`. The second is `P` or `-`, indicating + whether the derivation is present on the system. This indicates + whether installation of an available derivation will require the + derivation to be built. The third is `S` or `-`, indicating whether + a substitute is available for the derivation. + + - `--attr-path`; `-P`\ + Print the *attribute path* of the derivation, which can be used to + unambiguously select it using the `--attr` option available in + commands that install derivations like `nix-env --install`. This + option only works together with `--available` + + - `--no-name`\ + Suppress printing of the `name` attribute of each derivation. + + - `--compare-versions` / `-c`\ + Compare installed versions to available versions, or vice versa (if + `--available` is given). This is useful for quickly seeing whether + upgrades for installed packages are available in a Nix expression. A + column is added with the following meaning: + + - `<` *version*\ + A newer version of the package is available or installed. + + - `=` *version*\ + At most the same version of the package is available or + installed. + + - `>` *version*\ + Only older versions of the package are available or installed. + + - `- ?`\ + No version of the package is available or installed. + + - `--system`\ + Print the `system` attribute of the derivation. + + - `--drv-path`\ + Print the path of the [store derivation](@docroot@/glossary.md#gloss-store-derivation). + + - `--out-path`\ + Print the output path of the derivation. + + - `--description`\ + Print a short (one-line) description of the derivation, if + available. The description is taken from the `meta.description` + attribute of the derivation. + + - `--meta`\ + Print all of the meta-attributes of the derivation. This option is + only available with `--xml` or `--json`. + +{{#include ./opt-common.md}} + +{{#include ../opt-common.md}} + +{{#include ./env-common.md}} + +{{#include ../env-common.md}} + +# Examples + +To show installed packages: + +```console +$ nix-env -q +bison-1.875c +docbook-xml-4.2 +firefox-1.0.4 +MPlayer-1.0pre7 +ORBit2-2.8.3 +… +``` + +To show available packages: + +```console +$ nix-env -qa +firefox-1.0.7 +GConf-2.4.0.1 +MPlayer-1.0pre7 +ORBit2-2.8.3 +… +``` + +To show the status of available packages: + +```console +$ nix-env -qas +-P- firefox-1.0.7 (not installed but present) +--S GConf-2.4.0.1 (not present, but there is a substitute for fast installation) +--S MPlayer-1.0pre3 (i.e., this is not the installed MPlayer, even though the version is the same!) +IP- ORBit2-2.8.3 (installed and by definition present) +… +``` + +To show available packages in the Nix expression `foo.nix`: + +```console +$ nix-env -f ./foo.nix -qa +foo-1.2.3 +``` + +To compare installed versions to what’s available: + +```console +$ nix-env -qc +... +acrobat-reader-7.0 - ? (package is not available at all) +autoconf-2.59 = 2.59 (same version) +firefox-1.0.4 < 1.0.7 (a more recent version is available) +... +``` + +To show all packages with “`zip`” in the name: + +```console +$ nix-env -qa '.*zip.*' +bzip2-1.0.6 +gzip-1.6 +zip-3.0 +… +``` + +To show all packages with “`firefox`” or “`chromium`” in the name: + +```console +$ nix-env -qa '.*(firefox|chromium).*' +chromium-37.0.2062.94 +chromium-beta-38.0.2125.24 +firefox-32.0.3 +firefox-with-plugins-13.0.1 +… +``` + +To show all packages in the latest revision of the Nixpkgs repository: + +```console +$ nix-env -f https://github.com/NixOS/nixpkgs/archive/master.tar.gz -qa +``` + |