nix --repair-path - re-download path from substituter

       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).

       $ 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'...
       …

                                                                                      nix-store--repair-path(1)

       nix --repair-path - re-download path from substituter

       nix-store --repair-path paths…