mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-11-16 03:06:17 +02:00
eb7d7780b1
This is needed to avoid this https://github.com/mesonbuild/meson/issues/13774 when we go back to making our subproject directory `src`.
41 lines
1.6 KiB
Markdown
41 lines
1.6 KiB
Markdown
# Name
|
||
|
||
`nix-store --dump` - write a single path to a [Nix Archive]
|
||
|
||
## Synopsis
|
||
|
||
`nix-store` `--dump` *path*
|
||
|
||
## Description
|
||
|
||
The operation `--dump` produces a [Nix archive](@docroot@/glossary.md#gloss-nar) (NAR) file containing the
|
||
contents of the file system tree rooted at *path*. The archive is
|
||
written to standard output.
|
||
|
||
A NAR archive is like a TAR or Zip archive, but it contains only the
|
||
information that Nix considers important. For instance, timestamps are
|
||
elided because all files in the Nix store have their timestamp set to 0
|
||
anyway. Likewise, all permissions are left out except for the execute
|
||
bit, because all files in the Nix store have 444 or 555 permission.
|
||
|
||
Also, a NAR archive is *canonical*, meaning that “equal” paths always
|
||
produce the same NAR archive. For instance, directory entries are
|
||
always sorted so that the actual on-disk order doesn’t influence the
|
||
result. This means that the cryptographic hash of a NAR dump of a
|
||
path is usable as a fingerprint of the contents of the path. Indeed,
|
||
the hashes of store paths stored in Nix’s database (see `nix-store --query
|
||
--hash`) are SHA-256 hashes of the NAR dump of each store path.
|
||
|
||
NAR archives support filenames of unlimited length and 64-bit file
|
||
sizes. They can contain regular files, directories, and symbolic links,
|
||
but not other types of files (such as device nodes).
|
||
|
||
A Nix archive can be unpacked using [`nix-store --restore`](@docroot@/command-ref/nix-store/restore.md).
|
||
|
||
[Nix Archive]: @docroot@/store/file-system-object/content-address.md#serial-nix-archive
|
||
|
||
{{#include ./opt-common.md}}
|
||
|
||
{{#include ../opt-common.md}}
|
||
|
||
{{#include ../env-common.md}}
|