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https://github.com/privatevoid-net/nix-super.git
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Use envvars NIX_CACHE_HOME, NIX_CONFIG_HOME, NIX_DATA_HOME, NIX_STATE_HOME if defined (#11351)
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17 changed files with 118 additions and 48 deletions
14
doc/manual/rl-next/add-nix-state-home.md
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14
doc/manual/rl-next/add-nix-state-home.md
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@ -0,0 +1,14 @@
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---
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synopsis: Use envvars NIX_CACHE_HOME, NIX_CONFIG_HOME, NIX_DATA_HOME, NIX_STATE_HOME if defined
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prs: [11351]
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---
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Added new environment variables:
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- `NIX_CACHE_HOME`
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- `NIX_CONFIG_HOME`
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- `NIX_DATA_HOME`
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- `NIX_STATE_HOME`
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Each, if defined, takes precedence over the corresponding [XDG environment variable](@docroot@/command-ref/env-common.md#xdg-base-directories).
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This provides more fine-grained control over where Nix looks for files, and allows to have a stand-alone Nix environment, which only uses files in a specific directory, and doesn't interfere with the user environment.
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@ -138,6 +138,19 @@ The following environment variables are used to determine locations of various s
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- [`XDG_STATE_HOME`]{#env-XDG_STATE_HOME} (default `~/.local/state`)
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- [`XDG_CACHE_HOME`]{#env-XDG_CACHE_HOME} (default `~/.cache`)
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[XDG Base Directory Specification]: https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
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[`use-xdg-base-directories`]: @docroot@/command-ref/conf-file.md#conf-use-xdg-base-directories
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In addition, setting the following environment variables overrides the XDG base directories:
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- [`NIX_CONFIG_HOME`]{#env-NIX_CONFIG_HOME} (default `$XDG_CONFIG_HOME/nix`)
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- [`NIX_STATE_HOME`]{#env-NIX_STATE_HOME} (default `$XDG_STATE_HOME/nix`)
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- [`NIX_CACHE_HOME`]{#env-NIX_CACHE_HOME} (default `$XDG_CACHE_HOME/nix`)
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When [`use-xdg-base-directories`] is enabled, the configuration directory is:
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1. `$NIX_CONFIG_HOME`, if it is defined
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2. Otherwise, `$XDG_CONFIG_HOME/nix`, if `XDG_CONFIG_HOME` is defined
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3. Otherwise, `~/.config/nix`.
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Likewise for the state and cache directories.
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@ -3,29 +3,33 @@ if [ -n "$HOME" ] && [ -n "$USER" ]; then
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# Set up the per-user profile.
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NIX_LINK="$HOME/.nix-profile"
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if [ -n "${XDG_STATE_HOME-}" ]; then
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NIX_LINK_NEW="$XDG_STATE_HOME/nix/profile"
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if [ -n "$NIX_STATE_HOME" ]; then
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NIX_LINK="$NIX_STATE_HOME/profile"
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else
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NIX_LINK_NEW="$HOME/.local/state/nix/profile"
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fi
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if [ -e "$NIX_LINK_NEW" ]; then
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if [ -t 2 ] && [ -e "$NIX_LINK" ]; then
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warning="\033[1;35mwarning:\033[0m"
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printf "$warning Both %s and legacy %s exist; using the former.\n" "$NIX_LINK_NEW" "$NIX_LINK" 1>&2
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if [ "$(realpath "$NIX_LINK")" = "$(realpath "$NIX_LINK_NEW")" ]; then
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printf " Since the profiles match, you can safely delete either of them.\n" 1>&2
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else
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# This should be an exceptionally rare occasion: the only way to get it would be to
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# 1. Update to newer Nix;
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# 2. Remove .nix-profile;
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# 3. Set the $NIX_LINK_NEW to something other than the default user profile;
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# 4. Roll back to older Nix.
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# If someone did all that, they can probably figure out how to migrate the profile.
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printf "$warning Profiles do not match. You should manually migrate from %s to %s.\n" "$NIX_LINK" "$NIX_LINK_NEW" 1>&2
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fi
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NIX_LINK="$HOME/.nix-profile"
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if [ -n "${XDG_STATE_HOME-}" ]; then
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NIX_LINK_NEW="$XDG_STATE_HOME/nix/profile"
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else
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NIX_LINK_NEW="$HOME/.local/state/nix/profile"
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fi
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if [ -e "$NIX_LINK_NEW" ]; then
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if [ -t 2 ] && [ -e "$NIX_LINK" ]; then
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warning="\033[1;35mwarning:\033[0m"
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printf "$warning Both %s and legacy %s exist; using the former.\n" "$NIX_LINK_NEW" "$NIX_LINK" 1>&2
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if [ "$(realpath "$NIX_LINK")" = "$(realpath "$NIX_LINK_NEW")" ]; then
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printf " Since the profiles match, you can safely delete either of them.\n" 1>&2
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else
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# This should be an exceptionally rare occasion: the only way to get it would be to
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# 1. Update to newer Nix;
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# 2. Remove .nix-profile;
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# 3. Set the $NIX_LINK_NEW to something other than the default user profile;
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# 4. Roll back to older Nix.
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# If someone did all that, they can probably figure out how to migrate the profile.
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printf "$warning Profiles do not match. You should manually migrate from %s to %s.\n" "$NIX_LINK" "$NIX_LINK_NEW" 1>&2
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fi
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fi
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NIX_LINK="$NIX_LINK_NEW"
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fi
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NIX_LINK="$NIX_LINK_NEW"
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fi
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# Set up environment.
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@ -134,7 +134,7 @@ NixRepl::NixRepl(const LookupPath & lookupPath, nix::ref<Store> store, ref<EvalS
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, getValues(getValues)
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, staticEnv(new StaticEnv(nullptr, state->staticBaseEnv.get()))
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, runNixPtr{runNix}
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, interacter(make_unique<ReadlineLikeInteracter>(getDataDir() + "/nix/repl-history"))
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, interacter(make_unique<ReadlineLikeInteracter>(getDataDir() + "/repl-history"))
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{
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}
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@ -69,7 +69,7 @@ struct AttrDb
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{
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auto state(_state->lock());
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Path cacheDir = getCacheDir() + "/nix/eval-cache-v5";
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Path cacheDir = getCacheDir() + "/eval-cache-v5";
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createDirs(cacheDir);
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Path dbPath = cacheDir + "/" + fingerprint.to_string(HashFormat::Base16, false) + ".sqlite";
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@ -99,7 +99,7 @@ const std::string & EvalSettings::getCurrentSystem() const
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Path getNixDefExpr()
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{
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return settings.useXDGBaseDirectories
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? getStateDir() + "/nix/defexpr"
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? getStateDir() + "/defexpr"
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: getHome() + "/.nix-defexpr";
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}
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@ -36,7 +36,7 @@ struct CacheImpl : Cache
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{
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auto state(_state.lock());
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auto dbPath = getCacheDir() + "/nix/fetcher-cache-v2.sqlite";
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auto dbPath = getCacheDir() + "/fetcher-cache-v2.sqlite";
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createDirs(dirOf(dbPath));
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state->db = SQLite(dbPath);
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@ -1083,7 +1083,7 @@ std::vector<std::tuple<GitRepoImpl::Submodule, Hash>> GitRepoImpl::getSubmodules
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ref<GitRepo> getTarballCache()
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{
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static auto repoDir = std::filesystem::path(getCacheDir()) / "nix" / "tarball-cache";
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static auto repoDir = std::filesystem::path(getCacheDir()) / "tarball-cache";
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return GitRepo::openRepo(repoDir, true, true);
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}
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@ -44,7 +44,7 @@ bool isCacheFileWithinTtl(time_t now, const struct stat & st)
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Path getCachePath(std::string_view key, bool shallow)
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{
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return getCacheDir()
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+ "/nix/gitv3/"
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+ "/gitv3/"
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+ hashString(HashAlgorithm::SHA256, key).to_string(HashFormat::Nix32, false)
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+ (shallow ? "-shallow" : "");
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}
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@ -263,7 +263,7 @@ struct MercurialInputScheme : InputScheme
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return makeResult(res->value, res->storePath);
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}
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Path cacheDir = fmt("%s/nix/hg/%s", getCacheDir(), hashString(HashAlgorithm::SHA256, actualUrl).to_string(HashFormat::Nix32, false));
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Path cacheDir = fmt("%s/hg/%s", getCacheDir(), hashString(HashAlgorithm::SHA256, actualUrl).to_string(HashFormat::Nix32, false));
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/* If this is a commit hash that we already have, we don't
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have to pull again. */
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@ -116,7 +116,7 @@ static std::shared_ptr<Registry> getSystemRegistry(const Settings & settings)
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Path getUserRegistryPath()
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{
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return getConfigDir() + "/nix/registry.json";
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return getConfigDir() + "/registry.json";
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}
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std::shared_ptr<Registry> getUserRegistry(const Settings & settings)
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@ -159,7 +159,7 @@ static std::shared_ptr<Registry> getGlobalRegistry(const Settings & settings, re
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if (!hasPrefix(path, "/")) {
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auto storePath = downloadFile(store, path, "flake-registry.json").storePath;
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if (auto store2 = store.dynamic_pointer_cast<LocalFSStore>())
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store2->addPermRoot(storePath, getCacheDir() + "/nix/flake-registry.json");
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store2->addPermRoot(storePath, getCacheDir() + "/flake-registry.json");
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path = store->toRealPath(storePath);
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}
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@ -12,7 +12,7 @@ typedef std::map<std::string, std::map<std::string, bool>> TrustedList;
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Path trustedListPath()
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{
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return getDataDir() + "/nix/trusted-settings.json";
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return getDataDir() + "/trusted-settings.json";
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}
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static TrustedList readTrustedList()
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@ -135,7 +135,7 @@ std::vector<Path> getUserConfigFiles()
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std::vector<Path> files;
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auto dirs = getConfigDirs();
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for (auto & dir : dirs) {
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files.insert(files.end(), dir + "/nix/nix.conf");
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files.insert(files.end(), dir + "/nix.conf");
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}
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return files;
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}
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@ -87,7 +87,7 @@ public:
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Sync<State> _state;
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NarInfoDiskCacheImpl(Path dbPath = getCacheDir() + "/nix/binary-cache-v6.sqlite")
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NarInfoDiskCacheImpl(Path dbPath = getCacheDir() + "/binary-cache-v6.sqlite")
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{
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auto state(_state.lock());
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@ -1315,7 +1315,7 @@ ref<Store> openStore(StoreReference && storeURI)
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/* If /nix doesn't exist, there is no daemon socket, and
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we're not root, then automatically set up a chroot
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store in ~/.local/share/nix/root. */
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auto chrootStore = getDataDir() + "/nix/root";
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auto chrootStore = getDataDir() + "/root";
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if (!pathExists(chrootStore)) {
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try {
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createDirs(chrootStore);
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@ -7,15 +7,33 @@ namespace nix {
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Path getCacheDir()
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{
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auto cacheDir = getEnv("XDG_CACHE_HOME");
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return cacheDir ? *cacheDir : getHome() + "/.cache";
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auto dir = getEnv("NIX_CACHE_HOME");
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if (dir) {
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return *dir;
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} else {
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auto xdgDir = getEnv("XDG_CACHE_HOME");
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if (xdgDir) {
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return *xdgDir + "/nix";
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} else {
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return getHome() + "/.cache/nix";
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}
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}
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}
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Path getConfigDir()
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{
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auto configDir = getEnv("XDG_CONFIG_HOME");
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return configDir ? *configDir : getHome() + "/.config";
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auto dir = getEnv("NIX_CONFIG_HOME");
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if (dir) {
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return *dir;
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} else {
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auto xdgDir = getEnv("XDG_CONFIG_HOME");
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if (xdgDir) {
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return *xdgDir + "/nix";
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} else {
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return getHome() + "/.config/nix";
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}
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}
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}
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std::vector<Path> getConfigDirs()
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Path configHome = getConfigDir();
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auto configDirs = getEnv("XDG_CONFIG_DIRS").value_or("/etc/xdg");
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std::vector<Path> result = tokenizeString<std::vector<std::string>>(configDirs, ":");
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for (auto& p : result) {
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p += "/nix";
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}
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result.insert(result.begin(), configHome);
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return result;
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}
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@ -30,19 +51,37 @@ std::vector<Path> getConfigDirs()
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Path getDataDir()
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{
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auto dataDir = getEnv("XDG_DATA_HOME");
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return dataDir ? *dataDir : getHome() + "/.local/share";
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auto dir = getEnv("NIX_DATA_HOME");
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if (dir) {
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return *dir;
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} else {
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auto xdgDir = getEnv("XDG_DATA_HOME");
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if (xdgDir) {
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return *xdgDir + "/nix";
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} else {
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return getHome() + "/.local/share/nix";
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}
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}
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}
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Path getStateDir()
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{
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auto stateDir = getEnv("XDG_STATE_HOME");
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return stateDir ? *stateDir : getHome() + "/.local/state";
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auto dir = getEnv("NIX_STATE_HOME");
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if (dir) {
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return *dir;
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} else {
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auto xdgDir = getEnv("XDG_STATE_HOME");
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if (xdgDir) {
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return *xdgDir + "/nix";
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} else {
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return getHome() + "/.local/state/nix";
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}
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}
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}
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Path createNixStateDir()
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{
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Path dir = getStateDir() + "/nix";
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Path dir = getStateDir();
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createDirs(dir);
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return dir;
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}
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@ -24,12 +24,12 @@ Path getHomeOf(uid_t userId);
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Path getHome();
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/**
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* @return $XDG_CACHE_HOME or $HOME/.cache.
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* @return $NIX_CACHE_HOME or $XDG_CACHE_HOME/nix or $HOME/.cache/nix.
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*/
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Path getCacheDir();
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/**
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* @return $XDG_CONFIG_HOME or $HOME/.config.
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* @return $NIX_CONFIG_HOME or $XDG_CONFIG_HOME/nix or $HOME/.config/nix.
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*/
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Path getConfigDir();
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@ -39,12 +39,12 @@ Path getConfigDir();
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std::vector<Path> getConfigDirs();
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/**
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* @return $XDG_DATA_HOME or $HOME/.local/share.
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* @return $NIX_DATA_HOME or $XDG_DATA_HOME/nix or $HOME/.local/share/nix.
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*/
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Path getDataDir();
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/**
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* @return $XDG_STATE_HOME or $HOME/.local/state.
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* @return $NIX_STATE_HOME or $XDG_STATE_HOME/nix or $HOME/.local/state/nix.
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*/
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Path getStateDir();
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