Add configs for a new kubernetes cluster on NixOS.
This commit is contained in:
Tom Alexander
331
nix/kubernetes/util/install_files/default.nix
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331
nix/kubernetes/util/install_files/default.nix
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@@ -0,0 +1,331 @@
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{
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config,
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lib,
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...
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}:
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let
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cfg = config.me.install;
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inherit (lib)
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filter
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attrNames
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;
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get_shell_values =
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target:
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let
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homedir = config.users.users."${target.username}".home;
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group = config.users.users."${target.username}".group;
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in
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{
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source = lib.strings.escapeShellArg "${target.source}";
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destination = lib.strings.escapeShellArg "${homedir}/${target.target}";
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mode = lib.strings.escapeShellArg "${target.mode}";
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dir_mode = lib.strings.escapeShellArg "${target.dir_mode}";
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username = lib.strings.escapeShellArg "${target.username}";
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group = lib.strings.escapeShellArg "${group}";
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};
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install_user_file =
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let
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constructors = {
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"overwrite" = install_user_file_overwrite;
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"symlink" = install_user_file_symlink;
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};
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in
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stage: target: (constructors."${target.method}"."${stage}" target);
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install_user_file_overwrite = {
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"check" = (target: "");
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"install" = (
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target:
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let
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inherit (get_shell_values target)
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source
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destination
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mode
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dir_mode
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username
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group
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;
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flags = lib.strings.concatStringsSep " " [
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(if mode != "" then "-m ${mode}" else "")
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(if username != "" then "-o ${username}" else "")
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(if group != "" then "-g ${group}" else "")
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];
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dir_flags = lib.strings.concatStringsSep " " [
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(if dir_mode != "" then "-m ${dir_mode}" else "")
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(if username != "" then "-o ${username}" else "")
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(if group != "" then "-g ${group}" else "")
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];
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in
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if target.recursive then
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[
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''
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find ${source} -type f -print0 | while read -r -d "" file; do
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relative_path=$(realpath -s --relative-to ${source} "$file")
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full_dest=${destination}/"$relative_path"
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create_containing_directories "$full_dest" ${dir_flags}
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$DRY_RUN_CMD install $VERBOSE_ARG --compare ${flags} "$file" "$full_dest"
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done
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''
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]
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else
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[
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''
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create_containing_directories ${destination} ${dir_flags}
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$DRY_RUN_CMD install $VERBOSE_ARG --compare ${flags} ${source} ${destination}
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''
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]
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);
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"uninstall" = (
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target:
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let
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inherit (get_shell_values target)
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source
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destination
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;
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in
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if target.recursive then
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[
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''
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find ${source} -type f -print0 | while read -r -d "" file; do
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relative_path=$(realpath -s --relative-to ${source} "$file")
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full_dest=${destination}/"$relative_path"
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$DRY_RUN_CMD echo rm -f "$full_dest"
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done
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''
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]
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else
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[
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''
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$DRY_RUN_CMD echo rm -f ${destination}
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''
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]
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);
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};
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install_user_file_symlink = {
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"check" = (target: "");
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"install" = (
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target:
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let
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inherit (get_shell_values target)
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source
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destination
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mode
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dir_mode
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username
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group
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;
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owner = lib.strings.concatStringsSep ":" (
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filter (val: val != "") [
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username
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group
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]
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);
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dir_flags = lib.strings.concatStringsSep " " [
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(if dir_mode != "" then "-m ${dir_mode}" else "")
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(if username != "" then "-o ${username}" else "")
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(if group != "" then "-g ${group}" else "")
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];
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in
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if target.recursive then
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[
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''
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find ${source} -type f -print0 | while read -r -d "" file; do
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relative_path=$(realpath -s --relative-to ${source} "$file")
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full_dest=${destination}/"$relative_path"
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create_containing_directories "$full_dest" ${dir_flags}
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$DRY_RUN_CMD ln $VERBOSE_ARG -s "$file" "$full_dest"
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$DRY_RUN_CMD chown $VERBOSE_ARG -h ${owner} "$full_dest"
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done
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''
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]
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else
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[
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''
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create_containing_directories ${destination} ${dir_flags}
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$DRY_RUN_CMD ln $VERBOSE_ARG -s ${source} ${destination}
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$DRY_RUN_CMD chown $VERBOSE_ARG -h ${owner} ${destination}
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''
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]
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);
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"uninstall" = (
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target:
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let
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inherit (get_shell_values target)
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source
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destination
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;
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in
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if target.recursive then
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[
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''
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find ${source} -type f -print0 | while read -r -d "" file; do
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relative_path=$(realpath -s --relative-to ${source} "$file")
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full_dest=${destination}/"$relative_path"
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$DRY_RUN_CMD echo rm -f "$full_dest"
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done
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''
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]
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else
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[
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''
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$DRY_RUN_CMD echo rm -f ${destination}
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''
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]
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);
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};
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in
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{
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imports = [ ];
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options.me.install = {
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user = lib.mkOption {
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default = { };
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type = lib.types.attrsOf (
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lib.types.submodule (
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{ name, config, ... }:
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let
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username = name;
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in
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{
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options = {
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enable = lib.mkOption {
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type = lib.types.bool;
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default = true;
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defaultText = "enable";
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example = lib.literalExpression false;
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description = "Whether we want to install files in this user's home directory.";
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};
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file = lib.mkOption {
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type = lib.types.attrsOf (
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lib.types.submodule (
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{ name, config, ... }:
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let
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path = name;
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in
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{
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options = {
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enable = lib.mkOption {
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type = lib.types.bool;
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default = true;
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defaultText = "enable";
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example = lib.literalExpression false;
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description = "Whether we want to install this file in this user's home directory.";
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};
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username = lib.mkOption {
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type = lib.types.str;
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defaultText = "username";
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example = "root";
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description = "The username for the user whose home directory will contain the file.";
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};
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target = lib.mkOption {
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type = lib.types.str;
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defaultText = "target";
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example = ".local/share/foo/bar.txt";
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description = "The path where the file should be written.";
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};
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method = lib.mkOption {
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type = lib.types.enum [
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"symlink"
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"overwrite"
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# "bind_mount" TODO: for directories?
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];
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default = "symlink";
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defaultText = "me.install.file.‹path›.method";
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example = "overwrite";
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description = "The way in which the file should be installed.";
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};
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mode = lib.mkOption {
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type = lib.types.str;
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default = "0444";
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defaultText = "me.install.file.‹path›.mode";
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example = "0750";
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description = "The read, write, execute permission flags.";
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};
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dir_mode = lib.mkOption {
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type = lib.types.str;
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default = "0755";
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defaultText = "dir_mode";
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example = "0755";
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description = "The read, write, execute permission flags for any parent directories that need to be created.";
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};
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source = lib.mkOption {
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type = lib.types.path;
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defaultText = "me.install.file.‹path›.source";
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example = ./files/foo.txt;
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description = "The source file to install into the destination.";
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};
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recursive = lib.mkOption {
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type = lib.types.bool;
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default = false;
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defaultText = "recursive";
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example = lib.literalExpression false;
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description = "Whether we want to recurse through the directory doing individual installs for each file.";
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};
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};
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config = {
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username = lib.mkDefault username;
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target = lib.mkDefault path;
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};
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}
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)
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);
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};
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};
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}
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)
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);
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};
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};
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config =
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let
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all_users = builtins.map (username: cfg.user."${username}") (attrNames cfg.user);
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enabled_users = filter (user: user.enable) all_users;
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all_file_targets = lib.flatten (
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builtins.map (user: (builtins.map (path: user.file."${path}") (attrNames user.file))) enabled_users
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);
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enabled_file_targets = filter (target: target.enable) all_file_targets;
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check_commands = lib.flatten (builtins.map (install_user_file "check") enabled_file_targets);
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install_commands = lib.flatten (builtins.map (install_user_file "install") enabled_file_targets);
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uninstall_commands = lib.flatten (
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builtins.map (install_user_file "uninstall") enabled_file_targets
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);
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in
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{
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systemd.services.me-install-file = {
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enable = true;
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description = "me-install-file";
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wantedBy = [ "multi-user.target" ];
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wants = [ "multi-user.target" ];
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before = [ "multi-user.target" ];
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# path = with pkgs; [
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# zfs
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# ];
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unitConfig.DefaultDependencies = "no";
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = "yes";
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};
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script = ''
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set -o pipefail
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IFS=$'\n\t'
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source ${./files/lib.bash}
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''
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+ (lib.strings.concatStringsSep "\n" (
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[
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]
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++ check_commands
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++ install_commands
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));
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preStop = ''
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set -o pipefail
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IFS=$'\n\t'
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source ${./files/lib.bash}
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''
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+ (lib.strings.concatStringsSep "\n" uninstall_commands);
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};
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};
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}
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