nix-super/src/nix/store-repair.md

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2021-01-14 00:27:39 +02:00
R""(
# Examples
* Repair a store path, after determining that it is corrupt:
```console
# nix store verify /nix/store/yb5q57zxv6hgqql42d5r8b5k5mcq6kay-hello-2.10
path '/nix/store/yb5q57zxv6hgqql42d5r8b5k5mcq6kay-hello-2.10' was
modified! expected hash
'sha256:1hd5vnh6xjk388gdk841vflicy8qv7qzj2hb7xlyh8lpb43j921l', got
'sha256:1a25lf78x5wi6pfkrxalf0n13kdaca0bqmjqnp7wfjza2qz5ssgl'
# nix store repair /nix/store/yb5q57zxv6hgqql42d5r8b5k5mcq6kay-hello-2.10
```
# Description
This command attempts to "repair" the store paths specified by
*installables* by redownloading them using the available
substituters. If no substitutes are available, then repair is not
possible.
> **Warning**
>
> During repair, there is a very small time window during which the old
> path (if it exists) is moved out of the way and replaced with the new
> path. If repair is interrupted in between, then the system may be left
> in a broken state (e.g., if the path contains a critical system
> component like the GNU C Library).
)""