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nixos: allow files to be symlinked anywhere #8

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nixos: allow files to be symlinked anywhere #8

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71 changes: 39 additions & 32 deletions nixos.nix
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Expand Up @@ -39,30 +39,6 @@ in
};

config = {
environment.etc =
let
link = file:
pkgs.runCommand
"${replaceStrings [ "/" "." " " ] [ "-" "" "" ] file}"
{ }
"ln -s '${file}' $out";

# Create environment.etc link entry.
mkLinkNameValuePair = persistentStoragePath: file: {
name = removePrefix "/etc/" file;
value = { source = link (concatPaths [ persistentStoragePath file ]); };
};

# Create all environment.etc link entries for a specific
# persistent storage path.
mkLinksToPersistentStorage = persistentStoragePath:
listToAttrs (map
(mkLinkNameValuePair persistentStoragePath)
cfg.${persistentStoragePath}.files
);
in
foldl' recursiveUpdate { } (map mkLinksToPersistentStorage persistentStoragePaths);

fileSystems =
let
# Create fileSystems bind mount entry.
Expand Down Expand Up @@ -150,17 +126,48 @@ in
)
'';

# Create a symlink to persistent storage, using mkDirWithPerms to
# correctly replicate the directory structure above the symlink
mkFileSymLink = persistentStoragePath: file: ''
# replicate the directory structure of ${file}
${mkDirWithPerms persistentStoragePath (dirOf file)}

# The base path for the state directory
# e.g. /state, /persist, etc.
sourceBase="${persistentStoragePath}"
sourceBase="''${sourceBase%/}"

# The path of the file in the ephemeral fs
# e.g. /etc/ssh/ssh_host_rsa_key
targetPath="${file}"

# The path of the file in the state directory
# e.g. /state/etc/ssh/ssh_host_rsa_key
sourcePath="$sourceBase$targetPath"

# Link the source file to the target
ln -s "$sourcePath" "$targetPath"
'';

# Build an activation script which creates all persistent
# storage directories we want to bind mount.
mkDirCreationScriptForPath = persistentStoragePath:
# storage directories for bind mounting, as well as all file symlinks.
mkActivationScript = persistentStoragePath:
nameValuePair
"createDirsIn-${replaceStrings [ "/" "." " " ] [ "-" "" "" ] persistentStoragePath}"
(noDepEntry (concatMapStrings
(mkDirWithPerms persistentStoragePath)
cfg.${persistentStoragePath}.directories
));
"createDirsAndLinksIn-${replaceStrings [ "/" "." " " ] [ "-" "" "" ] persistentStoragePath}"
(noDepEntry (concatStrings [
# Create directories for bind mounts
(concatMapStrings
(mkDirWithPerms persistentStoragePath)
cfg.${persistentStoragePath}.directories
)
# Create symlinks
(concatMapStrings
(mkFileSymLink persistentStoragePath)
cfg.${persistentStoragePath}.files
)
]));
in
listToAttrs (map mkDirCreationScriptForPath persistentStoragePaths);
listToAttrs (map mkActivationScript persistentStoragePaths);

assertions =
let
Expand Down