92 lines
2.3 KiB
Nix
92 lines
2.3 KiB
Nix
# produce a script to generate /etc
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{config, pkgs, ...}:
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###### interface
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let
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inherit (pkgs.lib) mkOption;
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option = {
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environment.etc = mkOption {
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default = [];
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example = [
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{ source = "/nix/store/.../etc/dir/file.conf.example";
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target = "dir/file.conf";
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mode = "0440";
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}
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];
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description = ''
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List of files that have to be linked in /etc.
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'';
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};
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};
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in
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###### implementation
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let
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copyScript = {source, target, mode ? "644", own ? "root.root"}:
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assert target != "nixos";
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''
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source="${source}"
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target="/etc/${target}"
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mkdir -p $(dirname "$target")
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test -e "$target" && rm -f "$target"
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cp "$source" "$target"
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chown ${own} "$target"
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chmod ${mode} "$target"
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'';
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makeEtc = import ./make-etc.nix {
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inherit (pkgs) stdenv;
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configFiles = config.environment.etc;
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};
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in
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{
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require = [option];
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system = {
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build = {
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etc = makeEtc;
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};
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activationScripts = {
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etc = pkgs.lib.fullDepEntry ''
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# Set up the statically computed bits of /etc.
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staticEtc=/etc/static
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rm -f $staticEtc
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ln -s ${makeEtc}/etc $staticEtc
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for i in $(cd $staticEtc && find * -type l); do
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mkdir -p /etc/$(dirname $i)
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rm -f /etc/$i
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if test -e "$staticEtc/$i.mode"; then
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# Create a regular file in /etc.
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cp $staticEtc/$i /etc/$i
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chown 0.0 /etc/$i
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chmod "$(cat "$staticEtc/$i.mode")" /etc/$i
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else
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# Create a symlink in /etc.
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ln -s $staticEtc/$i /etc/$i
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fi
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done
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# Remove dangling symlinks that point to /etc/static. These are
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# configuration files that existed in a previous configuration but not
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# in the current one. For efficiency, don't look under /etc/nixos
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# (where all the NixOS sources live).
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for i in $(find /etc/ \( -path /etc/nixos -prune \) -o -type l); do
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target=$(readlink "$i")
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if test "''${target:0:''${#staticEtc}}" = "$staticEtc" -a ! -e "$i"; then
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rm -f "$i"
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fi
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done
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'' [
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"systemConfig"
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"defaultPath" # path to cp, chmod, chown
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"stdio"
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];
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};
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};
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}
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