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feature: added support for substituting secrets into files #290

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feature: added support for substituting secrets into files
elliott-farrall committed Sep 22, 2024
commit c69b98e6e72ff74a0275e3e1fbdb2a1b0225187d
20 changes: 20 additions & 0 deletions modules/age-home.nix
Original file line number Diff line number Diff line change
@@ -65,6 +65,12 @@ with lib; let
''}
'';

substituteSecret = secretType:
builtins.concatStringsSep "\n" (builtins.map (file: ''
${pkgs.gnused}/bin/sed -i "s#@${secretType.name}@#$(cat ${secretType.path})#" ${file}
'')
secretType.substitutions);

testIdentities =
map
(path: ''
@@ -91,6 +97,11 @@ with lib; let
++ [cleanupAndLink]
);

substituteSecrets = builtins.concatStringsSep "\n" (
["echo '[agenix] substituting secrets...'"]
++ (map substituteSecret (builtins.attrValues cfg.secrets))
);

secretType = types.submodule ({
config,
name,
@@ -117,6 +128,14 @@ with lib; let
Path where the decrypted secret is installed.
'';
};
substitutions = mkOption {
type = types.listOf types.str;
default = [];
description = ''
List of files to substitute the secret into.
WARNING: It is recommended to set `force = true` for files managed through home-manager.
'';
};
mode = mkOption {
type = types.str;
default = "0400";
@@ -135,6 +154,7 @@ with lib; let
text = ''
${newGeneration}
${installSecrets}
${substituteSecrets}
exit 0
'';
};
24 changes: 24 additions & 0 deletions modules/age.nix
Original file line number Diff line number Diff line change
@@ -129,6 +129,17 @@ with lib; let
++ (map chownSecret (builtins.attrValues cfg.secrets))
);

substituteSecret = secretType:
builtins.concatStringsSep "\n" (builtins.map (file: ''
${pkgs.gnused}/bin/sed -i "s#@${secretType.name}@#$(cat ${secretType.path})#" ${file}
'')
secretType.substitutions);

substituteSecrets = builtins.concatStringsSep "\n" (
["echo '[agenix] substituting secrets...'"]
++ (map substituteSecret (builtins.attrValues cfg.secrets))
);

secretType = types.submodule ({config, ...}: {
options = {
name = mkOption {
@@ -155,6 +166,13 @@ with lib; let
Path where the decrypted secret is installed.
'';
};
substitutions = mkOption {
type = types.listOf types.str;
default = [];
description = ''
List of files to substitute the secret into.
'';
};
mode = mkOption {
type = types.str;
default = "0400";
@@ -298,6 +316,12 @@ in {
text = "";
deps = ["agenixChown"];
};

# Substitute secrets into files.
system.activationScripts.agenixSubstitute = {
text = substituteSecrets;
deps = ["agenix" "etc"];
};
})
(optionalAttrs isDarwin {
launchd.daemons.activate-agenix = {