171 lines
6.9 KiB
Nix
171 lines
6.9 KiB
Nix
# This module generates the nixos-checkout script, which replaces the
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# NixOS and Nixpkgs source trees in /etc/nixos/{nixos,nixpkgs} with
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# Subversion checkouts.
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{config, pkgs, ...}:
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with pkgs.lib;
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let
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options = {
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# !!! These option (and their implementation) seems
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# over-engineering. nixos-checkout was never intended to be a
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# generic, "check out anything that the user want to have from any
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# version management system whatsoever", but merely a trivial
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# convenience script to checkout the NixOS and Nixpkgs trees
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# during or after a NixOS installation.
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installer.repos.nixos = mkOption {
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default = [ { type = "svn"; } ];
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example =
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[ { type = "svn"; url = "https://svn.nixos.org/repos/nix/nixos/branches/stdenv-updates"; target = "/etc/nixos/nixos-stdenv-updates"; }
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{ type = "git"; initialize = ''git clone git://mawercer.de/nixos $target''; update = "git pull origin"; target = "/etc/nixos/nixos-git"; }
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];
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description = ''
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The NixOS repository from which the system will be built.
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<command>nixos-checkout</command> will update all working
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copies of the given repositories,
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<command>nixos-rebuild</command> will use the first item
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which has the attribute <literal>default = true</literal>
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falling back to the first item. The type defines the
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repository tool added to the path. It also defines a "valid"
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repository. If the target directory already exists and it's
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not valid it will be moved to the backup location
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<filename><replaceable>dir</replaceable>-date</filename>.
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For svn the default target and repositories are
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<filename>/etc/nixos/nixos</filename> and
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<filename>https://svn.nixos.org/repos/nix/nixos/trunk</filename>.
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For git repositories update is called after initialization
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when the repo is initialized. The initialize code is run
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from working directory dirname
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<replaceable>target</replaceable> and should create the
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directory
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<filename><replaceable>dir</replaceable></filename>. (<command>git
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clone url nixos/nixpkgs/services</command> should do) For
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the executables used see <option>repoTypes</option>.
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'';
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};
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installer.repos.nixpkgs = mkOption {
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default = [ { type = "svn"; } ];
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description = "same as <option>repos.nixos</option>";
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};
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installer.repos.services = mkOption {
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default = [ { type = "svn"; } ];
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description = "same as <option>repos.nixos</option>";
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};
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installer.repoTypes = mkOption {
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default = {
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svn = { valid = "[ -d .svn ]"; env = [ pkgs.coreutils pkgs.subversion ]; };
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git = { valid = "[ -d .git ]"; env = [ pkgs.coreutils pkgs.git pkgs.gnused /* FIXME: use full path to sed in nix-pull */ ]; };
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};
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description = ''
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Defines, for each supported version control system
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(e.g. <literal>git</literal>), the dependencies for the
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mechanism, as well as a test used to determine whether a
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directory is a checkout created by that version control
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system.
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'';
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};
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};
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### implementation
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# prepareRepoAttrs adds svn defaults and preparse the repo attribute sets so that they
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# returns in any case:
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# { type = git/svn;
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# target = path;
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# initialize = cmd; # must create target dir, dirname target will exist
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# update = cmd; # pwd will be target
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# default = true/false;
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# }
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prepareRepoAttrs = repo : attrs :
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assert (isAttrs attrs);
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assert (repo + "" == repo); # assert repo is a string
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if (! (attrs ? type)) then
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throw "repo type is missing of : ${showVal attrs}"
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# prepare svn repo
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else if attrs.type == "svn" then
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let a = { # add svn defaults
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url = "https://svn.nixos.org/repos/nix/${repo}/trunk";
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target = "/etc/nixos/${repo}";
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} // attrs; in
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rec {
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inherit (a) type target;
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default = if a ? default then a.default else false;
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initialize = "svn co ${a.url} ${a.target}";
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update = initialize; # co is just as fine as svn update
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}
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# prepare git repo
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else if attrs.type == "git" then # sanity check for existing attrs
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assert (all id (map ( attr : if hasAttr attr attrs then true
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else throw "git repository item is missing attribute ${attr}")
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[ "target" "initialize" "update" ]
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));
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let t = escapeShellArg attrs.target; in
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rec {
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inherit (attrs) type target;
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default = if attrs ? default then attrs.default else false;
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update = "cd ${t}; ${attrs.update}";
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initialize = ''
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cd $(dirname ${t}); ${attrs.initialize}
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[ -d ${t} ] || { echo "git initialize failed to create target directory ${t}"; exit 1; }
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${update}'';
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}
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else throw "unkown repo type ${attrs.type}";
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# apply prepareRepoAttrs on each repo definition
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repos = mapAttrs ( repo : list : map (x : (prepareRepoAttrs repo x) // { inherit repo; } ) list ) config.installer.repos;
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# function returning the default repo (first one having attribute default or head of list)
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defaultRepo = list : head ( (filter ( attrs : attrs ? default && attrs.default == true ) list)
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++ list );
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# creates the nixos-checkout script
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nixosCheckout = pkgs.substituteAll {
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name = "nixos-checkout";
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dir = "bin";
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isExecutable = true;
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src = pkgs.writeScript "nixos-checkout" (''
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#! @shell@ -e
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# this file is automatically generated from nixos configuration file settings (installer.repos)
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backupTimestamp=$(date "+%Y%m%d%H%M%S")
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'' + concatMapStrings ( attrs :
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let repoType = builtins.getAttr attrs.type config.installer.repoTypes;
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target = escapeShellArg attrs.target; in
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''
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# ${attrs.type} repo ${target}
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PATH=
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for path in ${toString repoType.env}; do
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PATH=$PATH:$path/bin:$path/sbin
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done
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if [ -d ${target} ] && { cd ${target} && { ${ repoType.valid}; }; }; then
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echo; echo '>> ' updating ${attrs.type} repo ${target}
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set -x; ${attrs.update}; set +x
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else # [ make backup and ] initialize
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[ -e ${target} ] && mv ${target} ${target}-$backupTimestamp
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target=${target}
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[ -d "$(dirname ${target})" ] || mkdir -p "$(dirname ${target})"
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echo; echo '>> 'initializing ${attrs.type} repo ${target}
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set -x; ${attrs.initialize}; set +x
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fi
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''
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) # flatten all repo definition to one list adding the repository
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( concatLists (flattenAttrs repos) )
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);
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};
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in
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{
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require = options;
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environment.extraPackages = [nixosCheckout];
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}
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