nix --repair-path

Re-download path from substituter.

Synopsis

nix-store --repair-path paths…

Description

The operation --repair-path attempts to “repair” the specified paths 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).

Example

$ nix-store --verify-path /nix/store/dj7a81wsm1ijwwpkks3725661h3263p5-glibc-2.13
path `/nix/store/dj7a81wsm1ijwwpkks3725661h3263p5-glibc-2.13' was modified!
  expected hash `2db57715ae90b7e31ff1f2ecb8c12ec1cc43da920efcbe3b22763f36a1861588',
  got `481c5aa5483ebc97c20457bb8bca24deea56550d3985cda0027f67fe54b808e4'

$ nix-store --repair-path /nix/store/dj7a81wsm1ijwwpkks3725661h3263p5-glibc-2.13
fetching path `/nix/store/d7a81wsm1ijwwpkks3725661h3263p5-glibc-2.13'...
…