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243 lines
8 KiB
Markdown
243 lines
8 KiB
Markdown
# Name
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`nix-store --query` - display information about store paths
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# Synopsis
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`nix-store` {`--query` | `-q`}
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{`--outputs` | `--requisites` | `-R` | `--references` | `--referrers` |
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`--referrers-closure` | `--deriver` | `-d` | `--valid-derivers` |
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`--graph` | `--tree` | `--binding` *name* | `-b` *name* | `--hash` |
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`--size` | `--roots`}
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[`--use-output`] [`-u`] [`--force-realise`] [`-f`]
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*paths…*
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# Description
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The operation `--query` displays various bits of information about the
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store paths . The queries are described below. At most one query can be
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specified. The default query is `--outputs`.
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The paths *paths* may also be symlinks from outside of the Nix store, to
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the Nix store. In that case, the query is applied to the target of the
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symlink.
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# Common query options
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- `--use-output` / `-u`
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For each argument to the query that is a [store derivation], apply the
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query to the output path of the derivation instead.
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- `--force-realise` / `-f`
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Realise each argument to the query first (see [`nix-store --realise`](./realise.md)).
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[store derivation]: @docroot@/glossary.md#gloss-store-derivation
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# Queries
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- `--outputs`
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Prints out the [output paths] of the store
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derivations *paths*. These are the paths that will be produced when
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the derivation is built.
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[output paths]: @docroot@/glossary.md#gloss-output-path
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- `--requisites` / `-R`
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Prints out the [closure] of the store path *paths*.
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[closure]: @docroot@/glossary.md#gloss-closure
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This query has one option:
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- `--include-outputs`
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Also include the existing output paths of [store derivation]s,
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and their closures.
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This query can be used to implement various kinds of deployment. A
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*source deployment* is obtained by distributing the closure of a
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store derivation. A *binary deployment* is obtained by distributing
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the closure of an output path. A *cache deployment* (combined
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source/binary deployment, including binaries of build-time-only
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dependencies) is obtained by distributing the closure of a store
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derivation and specifying the option `--include-outputs`.
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- `--references`
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Prints the set of [references] of the store paths
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*paths*, that is, their immediate dependencies. (For *all*
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dependencies, use `--requisites`.)
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[references]: @docroot@/glossary.md#gloss-reference
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- `--referrers`
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Prints the set of *referrers* of the store paths *paths*, that is,
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the store paths currently existing in the Nix store that refer to
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one of *paths*. Note that contrary to the references, the set of
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referrers is not constant; it can change as store paths are added or
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removed.
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- `--referrers-closure`
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Prints the closure of the set of store paths *paths* under the
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referrers relation; that is, all store paths that directly or
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indirectly refer to one of *paths*. These are all the path currently
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in the Nix store that are dependent on *paths*.
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- `--deriver` / `-d`
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Prints the [deriver] that was used to build the store paths *paths*. If
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the path has no deriver (e.g., if it is a source file), or if the
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deriver is not known (e.g., in the case of a binary-only
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deployment), the string `unknown-deriver` is printed.
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The returned deriver is not guaranteed to exist in the local store, for
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example when *paths* were substituted from a binary cache.
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Use `--valid-derivers` instead to obtain valid paths only.
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[deriver]: @docroot@/glossary.md#gloss-deriver
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- `--valid-derivers`
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Prints a set of derivation files (`.drv`) which are supposed produce
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said paths when realized. Might print nothing, for example for source paths
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or paths substituted from a binary cache.
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- `--graph`
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Prints the references graph of the store paths *paths* in the format
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of the `dot` tool of AT\&T's [Graphviz
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package](http://www.graphviz.org/). This can be used to visualise
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dependency graphs. To obtain a build-time dependency graph, apply
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this to a store derivation. To obtain a runtime dependency graph,
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apply it to an output path.
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- `--tree`
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Prints the references graph of the store paths *paths* as a nested
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ASCII tree. References are ordered by descending closure size; this
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tends to flatten the tree, making it more readable. The query only
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recurses into a store path when it is first encountered; this
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prevents a blowup of the tree representation of the graph.
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- `--graphml`
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Prints the references graph of the store paths *paths* in the
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[GraphML](http://graphml.graphdrawing.org/) file format. This can be
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used to visualise dependency graphs. To obtain a build-time
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dependency graph, apply this to a [store derivation]. To obtain a
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runtime dependency graph, apply it to an output path.
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- `--binding` *name* / `-b` *name*
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Prints the value of the attribute *name* (i.e., environment
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variable) of the [store derivation]s *paths*. It is an error for a
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derivation to not have the specified attribute.
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- `--hash`
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Prints the SHA-256 hash of the contents of the store paths *paths*
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(that is, the hash of the output of `nix-store --dump` on the given
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paths). Since the hash is stored in the Nix database, this is a fast
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operation.
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- `--size`
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Prints the size in bytes of the contents of the store paths *paths*
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— to be precise, the size of the output of `nix-store --dump` on
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the given paths. Note that the actual disk space required by the
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store paths may be higher, especially on filesystems with large
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cluster sizes.
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- `--roots`
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Prints the garbage collector roots that point, directly or
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indirectly, at the store paths *paths*.
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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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# Examples
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Print the closure (runtime dependencies) of the `svn` program in the
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current user environment:
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```console
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$ nix-store --query --requisites $(which svn)
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/nix/store/5mbglq5ldqld8sj57273aljwkfvj22mc-subversion-1.1.4
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/nix/store/9lz9yc6zgmc0vlqmn2ipcpkjlmbi51vv-glibc-2.3.4
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...
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```
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Print the build-time dependencies of `svn`:
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```console
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$ nix-store --query --requisites $(nix-store --query --deriver $(which svn))
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/nix/store/02iizgn86m42q905rddvg4ja975bk2i4-grep-2.5.1.tar.bz2.drv
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/nix/store/07a2bzxmzwz5hp58nf03pahrv2ygwgs3-gcc-wrapper.sh
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/nix/store/0ma7c9wsbaxahwwl04gbw3fcd806ski4-glibc-2.3.4.drv
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... lots of other paths ...
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```
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The difference with the previous example is that we ask the closure of
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the derivation (`-qd`), not the closure of the output path that contains
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`svn`.
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Show the build-time dependencies as a tree:
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```console
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$ nix-store --query --tree $(nix-store --query --deriver $(which svn))
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/nix/store/7i5082kfb6yjbqdbiwdhhza0am2xvh6c-subversion-1.1.4.drv
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+---/nix/store/d8afh10z72n8l1cr5w42366abiblgn54-builder.sh
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+---/nix/store/fmzxmpjx2lh849ph0l36snfj9zdibw67-bash-3.0.drv
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...
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```
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Show all paths that depend on the same OpenSSL library as `svn`:
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```console
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$ nix-store --query --referrers $(nix-store --query --binding openssl $(nix-store --query --deriver $(which svn)))
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/nix/store/23ny9l9wixx21632y2wi4p585qhva1q8-sylpheed-1.0.0
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/nix/store/5mbglq5ldqld8sj57273aljwkfvj22mc-subversion-1.1.4
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/nix/store/dpmvp969yhdqs7lm2r1a3gng7pyq6vy4-subversion-1.1.3
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/nix/store/l51240xqsgg8a7yrbqdx1rfzyv6l26fx-lynx-2.8.5
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```
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Show all paths that directly or indirectly depend on the Glibc (C
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library) used by `svn`:
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```console
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$ nix-store --query --referrers-closure $(ldd $(which svn) | grep /libc.so | awk '{print $3}')
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/nix/store/034a6h4vpz9kds5r6kzb9lhh81mscw43-libgnomeprintui-2.8.2
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/nix/store/15l3yi0d45prm7a82pcrknxdh6nzmxza-gawk-3.1.4
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...
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```
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Note that `ldd` is a command that prints out the dynamic libraries used
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by an ELF executable.
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Make a picture of the runtime dependency graph of the current user
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environment:
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```console
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$ nix-store --query --graph ~/.nix-profile | dot -Tps > graph.ps
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$ gv graph.ps
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```
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Show every garbage collector root that points to a store path that
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depends on `svn`:
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```console
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$ nix-store --query --roots $(which svn)
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/nix/var/nix/profiles/default-81-link
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/nix/var/nix/profiles/default-82-link
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/home/eelco/.local/state/nix/profiles/profile-97-link
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```
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