Merge pull request #5588 from tweag/balsoft/xdg
Follow XDG Base Directory standard
This commit is contained in:
Théophane Hufschmitt
GitHub
commit
9ebbe35817
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@ -91,3 +91,16 @@ Most Nix commands interpret the following environment variables:
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variable sets the initial size of the heap in bytes. It defaults to
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384 MiB. Setting it to a low value reduces memory consumption, but
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will increase runtime due to the overhead of garbage collection.
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## XDG Base Directory
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New Nix commands conform to the [XDG Base Directory Specification], and use the following environment variables to determine locations of various state and configuration files:
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- [`XDG_CONFIG_HOME`]{#env-XDG_CONFIG_HOME} (default `~/.config`)
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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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Classic Nix commands can also be made to follow this standard using the [`use-xdg-base-directories`] configuration option.
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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`]: ../command-ref/conf-file.md#conf-use-xdg-base-directories
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@ -136,7 +136,7 @@ EOF
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cat <<EOF
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$step. Delete the files Nix added to your system:
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sudo rm -rf /etc/nix $NIX_ROOT $ROOT_HOME/.nix-profile $ROOT_HOME/.nix-defexpr $ROOT_HOME/.nix-channels $HOME/.nix-profile $HOME/.nix-defexpr $HOME/.nix-channels
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sudo rm -rf "/etc/nix" "$NIX_ROOT" "$ROOT_HOME/.nix-profile" "$ROOT_HOME/.nix-defexpr" "$ROOT_HOME/.nix-channels" "$ROOT_HOME/.local/state/nix" "$ROOT_HOME/.cache/nix" "$HOME/.nix-profile" "$HOME/.nix-defexpr" "$HOME/.nix-channels" "$HOME/.local/state/nix" "$HOME/.cache/nix"
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and that is it.
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@ -188,6 +188,8 @@ fi
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# shellcheck source=./nix-profile.sh.in
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. "$nix/etc/profile.d/nix.sh"
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NIX_LINK="$HOME/.nix-profile"
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if ! "$nix/bin/nix-env" -i "$nix"; then
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echo "$0: unable to install Nix into your default profile" >&2
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exit 1
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@ -196,7 +198,7 @@ fi
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# Install an SSL certificate bundle.
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if [ -z "$NIX_SSL_CERT_FILE" ] || ! [ -f "$NIX_SSL_CERT_FILE" ]; then
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"$nix/bin/nix-env" -i "$cacert"
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export NIX_SSL_CERT_FILE="$HOME/.nix-profile/etc/ssl/certs/ca-bundle.crt"
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export NIX_SSL_CERT_FILE="$NIX_LINK/etc/ssl/certs/ca-bundle.crt"
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fi
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# Subscribe the user to the Nixpkgs channel and fetch it.
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@ -214,8 +216,8 @@ fi
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added=
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p=
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p_sh=$HOME/.nix-profile/etc/profile.d/nix.sh
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p_fish=$HOME/.nix-profile/etc/profile.d/nix.fish
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p_sh=$NIX_LINK/etc/profile.d/nix.sh
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p_fish=$NIX_LINK/etc/profile.d/nix.fish
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if [ -z "$NIX_INSTALLER_NO_MODIFY_PROFILE" ]; then
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# Make the shell source nix.sh during login.
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for i in .bash_profile .bash_login .profile; do
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@ -2,7 +2,33 @@
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if [ -n "${__ETC_PROFILE_NIX_SOURCED:-}" ]; then return; fi
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__ETC_PROFILE_NIX_SOURCED=1
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export NIX_PROFILES="@localstatedir@/nix/profiles/default $HOME/.nix-profile"
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NIX_LINK=$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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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" ]; then
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NIX_LINK="$NIX_LINK_NEW"
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else
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if [ -t 2 ] && [ -e "$NIX_LINK_NEW" ]; then
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warning="\033[1;35mwarning:\033[0m"
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printf "$warning Both %s and legacy %s exist; using the latter.\n" "$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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fi
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export NIX_PROFILES="@localstatedir@/nix/profiles/default $NIX_LINK"
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# Set $NIX_SSL_CERT_FILE so that Nixpkgs applications like curl work.
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if [ -n "${NIX_SSL_CERT_FILE:-}" ]; then
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@ -34,4 +60,5 @@ else
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unset -f check_nix_profiles
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fi
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export PATH="$HOME/.nix-profile/bin:@localstatedir@/nix/profiles/default/bin:$PATH"
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export PATH="$NIX_LINK/bin:@localstatedir@/nix/profiles/default/bin:$PATH"
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unset NIX_LINK
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@ -2,11 +2,35 @@ if [ -n "$HOME" ] && [ -n "$USER" ]; then
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# Set up the per-user profile.
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NIX_LINK=$HOME/.nix-profile
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NIX_LINK="$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" ]; then
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NIX_LINK="$NIX_LINK_NEW"
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else
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if [ -t 2 ] && [ -e "$NIX_LINK_NEW" ]; then
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warning="\033[1;35mwarning:\033[0m"
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printf "$warning Both %s and legacy %s exist; using the latter.\n" "$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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fi
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# Set up environment.
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# This part should be kept in sync with nixpkgs:nixos/modules/programs/environment.nix
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export NIX_PROFILES="@localstatedir@/nix/profiles/default $HOME/.nix-profile"
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export NIX_PROFILES="@localstatedir@/nix/profiles/default $NIX_LINK"
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# Set $NIX_SSL_CERT_FILE so that Nixpkgs applications like curl work.
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if [ -e /etc/ssl/certs/ca-certificates.crt ]; then # NixOS, Ubuntu, Debian, Gentoo, Arch
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@ -31,5 +55,5 @@ if [ -n "$HOME" ] && [ -n "$USER" ]; then
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fi
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export PATH="$NIX_LINK/bin:$PATH"
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unset NIX_LINK
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unset NIX_LINK NIX_LINK_NEW
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fi
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@ -2496,7 +2496,7 @@ Strings EvalSettings::getDefaultNixPath()
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res.push_back(s ? *s + "=" + p : p);
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};
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add(getHome() + "/.nix-defexpr/channels");
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add(settings.useXDGBaseDirectories ? getStateDir() + "/nix/defexpr/channels" : getHome() + "/.nix-defexpr/channels");
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add(settings.nixStateDir + "/profiles/per-user/root/channels/nixpkgs", "nixpkgs");
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add(settings.nixStateDir + "/profiles/per-user/root/channels");
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@ -945,6 +945,27 @@ public:
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resolves to a different location from that of the build machine. You
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can enable this setting if you are sure you're not going to do that.
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)"};
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Setting<bool> useXDGBaseDirectories{
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this, false, "use-xdg-base-directories",
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R"(
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If set to `true`, Nix will conform to the [XDG Base Directory Specification] for files in `$HOME`.
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The environment variables used to implement this are documented in the [Environment Variables section](@docroot@/installation/env-variables.md).
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[XDG Base Directory Specification]: https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
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> **Warning**
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> This changes the location of some well-known symlinks that Nix creates, which might break tools that rely on the old, non-XDG-conformant locations.
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In particular, the following locations change:
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| Old | New |
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|-------------------|--------------------------------|
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| `~/.nix-profile` | `$XDG_STATE_HOME/nix/profile` |
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| `~/.nix-defexpr` | `$XDG_STATE_HOME/nix/defexpr` |
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| `~/.nix-channels` | `$XDG_STATE_HOME/nix/channels` |
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)"
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};
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};
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@ -282,7 +282,7 @@ std::string optimisticLockProfile(const Path & profile)
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Path profilesDir()
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{
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auto profileRoot = getDataDir() + "/nix/profiles";
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auto profileRoot = createNixStateDir() + "/profiles";
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createDirs(profileRoot);
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return profileRoot;
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}
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@ -290,7 +290,7 @@ Path profilesDir()
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Path getDefaultProfile()
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{
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Path profileLink = getHome() + "/.nix-profile";
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Path profileLink = settings.useXDGBaseDirectories ? createNixStateDir() + "/profile" : getHome() + "/.nix-profile";
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try {
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auto profile =
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getuid() == 0
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@ -72,8 +72,9 @@ std::string optimisticLockProfile(const Path & profile);
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profiles. */
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Path profilesDir();
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/* Resolve ~/.nix-profile. If ~/.nix-profile doesn't exist yet, create
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it. */
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/* Resolve the default profile (~/.nix-profile by default, $XDG_STATE_HOME/
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nix/profile if XDG Base Directory Support is enabled), and create if doesn't
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exist */
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Path getDefaultProfile();
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}
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@ -608,6 +608,19 @@ Path getDataDir()
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return dataDir ? *dataDir : getHome() + "/.local/share";
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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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}
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Path createNixStateDir()
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{
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Path dir = getStateDir() + "/nix";
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createDirs(dir);
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return dir;
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}
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std::optional<Path> getSelfExe()
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{
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@ -158,6 +158,12 @@ Path getDataDir();
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/* Return the path of the current executable. */
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std::optional<Path> getSelfExe();
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/* Return $XDG_STATE_HOME or $HOME/.local/state. */
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Path getStateDir();
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/* Create the Nix state directory and return the path to it. */
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Path createNixStateDir();
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/* Create a directory and all its parents, if necessary. Returns the
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list of created directories, in order of creation. */
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Paths createDirs(const Path & path);
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@ -164,8 +164,8 @@ static int main_nix_channel(int argc, char ** argv)
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{
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// Figure out the name of the `.nix-channels' file to use
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auto home = getHome();
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channelsList = home + "/.nix-channels";
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nixDefExpr = home + "/.nix-defexpr";
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channelsList = settings.useXDGBaseDirectories ? createNixStateDir() + "/channels" : home + "/.nix-channels";
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nixDefExpr = settings.useXDGBaseDirectories ? createNixStateDir() + "/defexpr" : home + "/.nix-defexpr";
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// Figure out the name of the channels profile.
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profile = profilesDir() + "/channels";
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@ -1289,7 +1289,7 @@ static void opSwitchProfile(Globals & globals, Strings opFlags, Strings opArgs)
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throw UsageError("exactly one argument expected");
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Path profile = absPath(opArgs.front());
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Path profileLink = getHome() + "/.nix-profile";
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Path profileLink = settings.useXDGBaseDirectories ? createNixStateDir() + "/profile" : getHome() + "/.nix-profile";
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switchLink(profileLink, profile);
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}
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@ -1393,7 +1393,10 @@ static int main_nix_env(int argc, char * * argv)
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Globals globals;
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globals.instSource.type = srcUnknown;
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globals.instSource.nixExprPath = getHome() + "/.nix-defexpr";
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{
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Path nixExprPath = settings.useXDGBaseDirectories ? createNixStateDir() + "/defexpr" : getHome() + "/.nix-defexpr";
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globals.instSource.nixExprPath = nixExprPath;
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}
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globals.instSource.systemFilter = "*";
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if (!pathExists(globals.instSource.nixExprPath)) {
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@ -27,6 +27,8 @@ export NIX_REMOTE=$NIX_REMOTE_
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unset NIX_PATH
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export TEST_HOME=$TEST_ROOT/test-home
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export HOME=$TEST_HOME
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unset XDG_STATE_HOME
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unset XDG_DATA_HOME
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unset XDG_CONFIG_HOME
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unset XDG_CONFIG_DIRS
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unset XDG_CACHE_HOME
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@ -62,8 +64,8 @@ readLink() {
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}
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clearProfiles() {
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profiles="$HOME"/.local/share/nix/profiles
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rm -rf $profiles
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profiles="$HOME"/.local/state/nix/profiles
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rm -rf "$profiles"
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}
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clearStore() {
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@ -12,6 +12,19 @@ nix-channel --remove xyzzy
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[ -e $TEST_HOME/.nix-channels ]
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[ "$(cat $TEST_HOME/.nix-channels)" = '' ]
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# Test the XDG Base Directories support
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export NIX_CONFIG="use-xdg-base-directories = true"
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nix-channel --add http://foo/bar xyzzy
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nix-channel --list | grep -q http://foo/bar
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nix-channel --remove xyzzy
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unset NIX_CONFIG
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[ -e $TEST_HOME/.local/state/nix/channels ]
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[ "$(cat $TEST_HOME/.local/state/nix/channels)" = '' ]
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# Create a channel.
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rm -rf $TEST_ROOT/foo
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mkdir -p $TEST_ROOT/foo
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@ -56,6 +56,14 @@ nix profile history
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nix profile history | grep "packages.$system.default: ∅ -> 1.0"
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nix profile diff-closures | grep 'env-manifest.nix: ε → ∅'
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# Test XDG Base Directories support
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export NIX_CONFIG="use-xdg-base-directories = true"
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nix profile remove 1
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nix profile install $flake1Dir
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[[ $($TEST_HOME/.local/state/nix/profile/bin/hello) = "Hello World" ]]
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unset NIX_CONFIG
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# Test upgrading a package.
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printf NixOS > $flake1Dir/who
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printf 2.0 > $flake1Dir/version
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