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Add 'nix path-info' manpage

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Eelco Dolstra 2020-12-10 13:45:42 +01:00
parent cb25a89f1c
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35
src/nix/path-info.cc
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@ -29,38 +29,15 @@ struct CmdPathInfo : StorePathsCommand, MixJSON
return "query information about store paths";
}
Category category() override { return catSecondary; }
Examples examples() override
std::string doc() override
{
return {
Example{
"To show the closure sizes of every path in the current NixOS system closure, sorted by size:",
"nix path-info -rS /run/current-system | sort -nk2"
},
Example{
"To show a package's closure size and all its dependencies with human readable sizes:",
"nix path-info -rsSh nixpkgs#rust"
},
Example{
"To check the existence of a path in a binary cache:",
"nix path-info -r /nix/store/7qvk5c91...-geeqie-1.1 --store https://cache.nixos.org/"
},
Example{
"To print the 10 most recently added paths (using --json and the jq(1) command):",
"nix path-info --json --all | jq -r 'sort_by(.registrationTime)[-11:-1][].path'"
},
Example{
"To show the size of the entire Nix store:",
"nix path-info --json --all | jq 'map(.narSize) | add'"
},
Example{
"To show every path whose closure is bigger than 1 GB, sorted by closure size:",
"nix path-info --json --all -S | jq 'map(select(.closureSize > 1e9)) | sort_by(.closureSize) | map([.path, .closureSize])'"
},
};
return
#include "path-info.md"
;
}
Category category() override { return catSecondary; }
void printSize(uint64_t value)
{
if (!humanReadable) {

94
src/nix/path-info.md Normal file
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@ -0,0 +1,94 @@
R""(
# Examples
* Print the store path produced by `nixpkgs#hello`:
```console
# nix path-info nixpkgs#hello
/nix/store/v5sv61sszx301i0x6xysaqzla09nksnd-hello-2.10
```
* Show the closure sizes of every path in the current NixOS system
closure, sorted by size:
```console
# nix path-info -rS /run/current-system | sort -nk2
/nix/store/hl5xwp9kdrd1zkm0idm3kkby9q66z404-empty 96
/nix/store/27324qvqhnxj3rncazmxc4mwy79kz8ha-nameservers 112
…
/nix/store/539jkw9a8dyry7clcv60gk6na816j7y8-etc 5783255504
/nix/store/zqamz3cz4dbzfihki2mk7a63mbkxz9xq-nixos-system-machine-20.09.20201112.3090c65 5887562256
```
* Show a package's closure size and all its dependencies with human
readable sizes:
```console
# nix path-info -rsSh nixpkgs#rustc
/nix/store/01rrgsg5zk3cds0xgdsq40zpk6g51dz9-ncurses-6.2-dev 386.7K 69.1M
/nix/store/0q783wnvixpqz6dxjp16nw296avgczam-libpfm-4.11.0 5.9M 37.4M
…
```
* Check the existence of a path in a binary cache:
```console
# nix path-info -r /nix/store/blzxgyvrk32ki6xga10phr4sby2xf25q-geeqie-1.5.1 --store https://cache.nixos.org/
path '/nix/store/blzxgyvrk32ki6xga10phr4sby2xf25q-geeqie-1.5.1' is not valid
```
* Print the 10 most recently added paths (using --json and the jq(1)
command):
```console
# nix path-info --json --all | jq -r 'sort_by(.registrationTime)[-11:-1][].path'
```
* Show the size of the entire Nix store:
```console
# nix path-info --json --all | jq 'map(.narSize) | add'
49812020936
```
* Show every path whose closure is bigger than 1 GB, sorted by closure
size:
```console
# nix path-info --json --all -S \
| jq 'map(select(.closureSize > 1e9)) | sort_by(.closureSize) | map([.path, .closureSize])'
[
…,
[
"/nix/store/zqamz3cz4dbzfihki2mk7a63mbkxz9xq-nixos-system-machine-20.09.20201112.3090c65",
5887562256
]
]
```
* Print the path of the store derivation produced by `nixpkgs#hello`:
```console
# nix path-info --derivation nixpkgs#hello
/nix/store/s6rn4jz1sin56rf4qj5b5v8jxjm32hlk-hello-2.10.drv
```
# Description
This command shows information about the store paths produced by
*installables*, or about all paths in the store if you pass `--all`.
By default, this command only prints the store paths. You can get
additional information by passing flags such as `--closure-size`,
--size`, `--sigs` or `--json`.
> **Warning**
>
> Note that `nix path-info` does not build or substitute the
> *installables* you specify. Thus, if the corresponding store paths
> don't already exist, this command will fail. You can use `nix build`
> to ensure that they exist.
)""