61b7cab481
Since 03eaa48 added perl.withPackages, there is a canonical way to
create a perl interpreter from a list of libraries, for use in script
shebangs or generic build inputs. This method is declarative (what we
are doing is clear), produces short shebangs[1] and needs not to wrap
existing scripts.
Unfortunately there are a few exceptions that I've found:
1. Scripts that are calling perl with the -T switch. This makes perl
ignore PERL5LIB, which is what perl.withPackages is using to inform
the interpreter of the library paths.
2. Perl packages that depends on libraries in their own path. This
is not possible because perl.withPackages works at build time. The
workaround is to add `-I $out/${perl.libPrefix}` to the shebang.
In all other cases I propose to switch to perl.withPackages.
[1]: https://lwn.net/Articles/779997/
162 lines
4.2 KiB
Nix
162 lines
4.2 KiB
Nix
# Management of static files in /etc.
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{ config, lib, pkgs, ... }:
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with lib;
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let
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etc' = filter (f: f.enable) (attrValues config.environment.etc);
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etc = pkgs.stdenvNoCC.mkDerivation {
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name = "etc";
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builder = ./make-etc.sh;
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preferLocalBuild = true;
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allowSubstitutes = false;
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/* !!! Use toXML. */
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sources = map (x: x.source) etc';
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targets = map (x: x.target) etc';
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modes = map (x: x.mode) etc';
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users = map (x: x.user) etc';
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groups = map (x: x.group) etc';
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};
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in
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{
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###### interface
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options = {
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environment.etc = mkOption {
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default = {};
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example = literalExample ''
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{ example-configuration-file =
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{ source = "/nix/store/.../etc/dir/file.conf.example";
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mode = "0440";
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};
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"default/useradd".text = "GROUP=100 ...";
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}
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'';
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description = ''
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Set of files that have to be linked in <filename>/etc</filename>.
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'';
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type = with types; attrsOf (submodule (
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{ name, config, ... }:
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{ options = {
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enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether this /etc file should be generated. This
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option allows specific /etc files to be disabled.
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'';
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};
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target = mkOption {
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type = types.str;
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description = ''
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Name of symlink (relative to
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<filename>/etc</filename>). Defaults to the attribute
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name.
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'';
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};
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text = mkOption {
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default = null;
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type = types.nullOr types.lines;
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description = "Text of the file.";
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};
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source = mkOption {
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type = types.path;
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description = "Path of the source file.";
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};
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mode = mkOption {
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type = types.str;
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default = "symlink";
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example = "0600";
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description = ''
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If set to something else than <literal>symlink</literal>,
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the file is copied instead of symlinked, with the given
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file mode.
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'';
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};
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uid = mkOption {
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default = 0;
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type = types.int;
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description = ''
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UID of created file. Only takes effect when the file is
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copied (that is, the mode is not 'symlink').
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'';
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};
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gid = mkOption {
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default = 0;
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type = types.int;
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description = ''
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GID of created file. Only takes effect when the file is
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copied (that is, the mode is not 'symlink').
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'';
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};
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user = mkOption {
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default = "+${toString config.uid}";
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type = types.str;
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description = ''
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User name of created file.
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Only takes effect when the file is copied (that is, the mode is not 'symlink').
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Changing this option takes precedence over <literal>uid</literal>.
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'';
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};
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group = mkOption {
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default = "+${toString config.gid}";
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type = types.str;
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description = ''
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Group name of created file.
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Only takes effect when the file is copied (that is, the mode is not 'symlink').
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Changing this option takes precedence over <literal>gid</literal>.
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'';
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};
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};
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config = {
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target = mkDefault name;
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source = mkIf (config.text != null) (
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let name' = "etc-" + baseNameOf name;
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in mkDefault (pkgs.writeText name' config.text));
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};
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}));
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};
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};
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###### implementation
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config = {
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system.build.etc = etc;
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system.activationScripts.etc = stringAfter [ "users" "groups" ]
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''
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# Set up the statically computed bits of /etc.
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echo "setting up /etc..."
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${pkgs.perl.withPackages (p: [ p.FileSlurp ])}/bin/perl ${./setup-etc.pl} ${etc}/etc
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'';
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};
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}
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