329 lines
9 KiB
Nix
329 lines
9 KiB
Nix
{
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lib,
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stdenv,
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callPackage,
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runCommandLocal,
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writeShellScript,
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glibc,
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pkgsi686Linux,
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coreutils,
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bubblewrap,
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}:
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{
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runScript ? "bash",
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extraInstallCommands ? "",
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meta ? { },
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passthru ? { },
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extraPreBwrapCmds ? "",
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extraBwrapArgs ? [ ],
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unshareUser ? false,
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unshareIpc ? false,
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unsharePid ? false,
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unshareNet ? false,
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unshareUts ? false,
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unshareCgroup ? false,
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privateTmp ? false,
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dieWithParent ? true,
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...
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}@args:
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assert (!args ? pname || !args ? version) -> (args ? name); # You must provide name if pname or version (preferred) is missing.
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let
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inherit (lib)
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concatLines
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concatStringsSep
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escapeShellArgs
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filter
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optionalString
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splitString
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;
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inherit (lib.attrsets) removeAttrs;
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name = args.name or "${args.pname}-${args.version}";
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executableName = args.pname or args.name;
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# we don't know which have been supplied, and want to avoid defaulting missing attrs to null. Passed into runCommandLocal
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nameAttrs = lib.filterAttrs (
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key: value:
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builtins.elem key [
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"name"
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"pname"
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"version"
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]
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) args;
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buildFHSEnv = callPackage ./buildFHSEnv.nix { };
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fhsenv = buildFHSEnv (
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removeAttrs args [
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"runScript"
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"extraInstallCommands"
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"meta"
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"passthru"
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"extraPreBwrapCmds"
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"extraBwrapArgs"
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"dieWithParent"
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"unshareUser"
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"unshareCgroup"
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"unshareUts"
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"unshareNet"
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"unsharePid"
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"unshareIpc"
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"privateTmp"
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]
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);
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etcBindEntries =
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let
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files = [
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# NixOS Compatibility
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"static"
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"nix" # mainly for nixUnstable users, but also for access to nix/netrc
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# Shells
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"shells"
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"bashrc"
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"zshenv"
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"zshrc"
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"zinputrc"
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"zprofile"
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# Users, Groups, NSS
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"passwd"
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"group"
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"shadow"
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"hosts"
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"resolv.conf"
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"nsswitch.conf"
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# User profiles
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"profiles"
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# Sudo & Su
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"login.defs"
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"sudoers"
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"sudoers.d"
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# Time
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"localtime"
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"zoneinfo"
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# Other Core Stuff
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"machine-id"
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"os-release"
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# PAM
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"pam.d"
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# Fonts
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"fonts"
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# ALSA
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"alsa"
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"asound.conf"
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# SSL
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"ssl/certs"
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"ca-certificates"
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"pki"
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];
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in
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map (path: "/etc/${path}") files;
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# Create this on the fly instead of linking from /nix
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# The container might have to modify it and re-run ldconfig if there are
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# issues running some binary with LD_LIBRARY_PATH
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createLdConfCache = ''
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cat > /etc/ld.so.conf <<EOF
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/lib
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/lib/x86_64-linux-gnu
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/lib64
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/usr/lib
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/usr/lib/x86_64-linux-gnu
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/usr/lib64
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/lib/i386-linux-gnu
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/lib32
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/usr/lib/i386-linux-gnu
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/usr/lib32
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/run/opengl-driver/lib
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/run/opengl-driver-32/lib
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EOF
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ldconfig &> /dev/null
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'';
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init =
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run:
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writeShellScript "${name}-init" ''
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source /etc/profile
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${createLdConfCache}
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exec ${run} "$@"
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'';
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indentLines = str: concatLines (map (s: " " + s) (filter (s: s != "") (splitString "\n" str)));
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bwrapCmd =
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{
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initArgs ? "",
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}:
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''
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${extraPreBwrapCmds}
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ignored=(/nix /dev /proc /etc ${optionalString privateTmp "/tmp"})
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ro_mounts=()
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symlinks=()
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etc_ignored=()
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# loop through all entries of root in the fhs environment, except its /etc.
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for i in ${fhsenv}/*; do
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path="/''${i##*/}"
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if [[ $path == '/etc' ]]; then
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:
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elif [[ -L $i ]]; then
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symlinks+=(--symlink "$(${coreutils}/bin/readlink "$i")" "$path")
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ignored+=("$path")
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else
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ro_mounts+=(--ro-bind "$i" "$path")
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ignored+=("$path")
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fi
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done
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# loop through the entries of /etc in the fhs environment.
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if [[ -d ${fhsenv}/etc ]]; then
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for i in ${fhsenv}/etc/*; do
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path="/''${i##*/}"
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# NOTE: we're binding /etc/fonts and /etc/ssl/certs from the host so we
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# don't want to override it with a path from the FHS environment.
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if [[ $path == '/fonts' || $path == '/ssl' ]]; then
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continue
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fi
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if [[ -L $i ]]; then
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symlinks+=(--symlink "$i" "/etc$path")
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else
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ro_mounts+=(--ro-bind "$i" "/etc$path")
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fi
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etc_ignored+=("/etc$path")
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done
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fi
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# propagate /etc from the actual host if nested
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if [[ -e /.host-etc ]]; then
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ro_mounts+=(--ro-bind /.host-etc /.host-etc)
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else
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ro_mounts+=(--ro-bind /etc /.host-etc)
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fi
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# link selected etc entries from the actual root
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for i in ${escapeShellArgs etcBindEntries}; do
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if [[ "''${etc_ignored[@]}" =~ "$i" ]]; then
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continue
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fi
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if [[ -e $i ]]; then
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symlinks+=(--symlink "/.host-etc/''${i#/etc/}" "$i")
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fi
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done
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declare -a auto_mounts
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# loop through all directories in the root
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for dir in /*; do
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# if it is a directory and it is not ignored
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if [[ -d "$dir" ]] && [[ ! "''${ignored[@]}" =~ "$dir" ]]; then
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# add it to the mount list
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auto_mounts+=(--bind "$dir" "$dir")
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fi
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done
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declare -a x11_args
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# Always mount a tmpfs on /tmp/.X11-unix
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# Rationale: https://github.com/flatpak/flatpak/blob/be2de97e862e5ca223da40a895e54e7bf24dbfb9/common/flatpak-run.c#L277
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x11_args+=(--tmpfs /tmp/.X11-unix)
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# Try to guess X socket path. This doesn't cover _everything_, but it covers some things.
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if [[ "$DISPLAY" == :* ]]; then
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display_nr=''${DISPLAY#?}
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local_socket=/tmp/.X11-unix/X$display_nr
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x11_args+=(--ro-bind-try "$local_socket" "$local_socket")
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fi
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${optionalString privateTmp ''
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# sddm places XAUTHORITY in /tmp
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if [[ "$XAUTHORITY" == /tmp/* ]]; then
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x11_args+=(--ro-bind-try "$XAUTHORITY" "$XAUTHORITY")
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fi
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# dbus-run-session puts the socket in /tmp
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IFS=";" read -ra addrs <<<"$DBUS_SESSION_BUS_ADDRESS"
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for addr in "''${addrs[@]}"; do
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[[ "$addr" == unix:* ]] || continue
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IFS="," read -ra parts <<<"''${addr#unix:}"
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for part in "''${parts[@]}"; do
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printf -v part '%s' "''${part//\\/\\\\}"
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printf -v part '%b' "''${part//%/\\x}"
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[[ "$part" == path=/tmp/* ]] || continue
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x11_args+=(--ro-bind-try "''${part#path=}" "''${part#path=}")
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done
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done
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''}
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cmd=(
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${bubblewrap}/bin/bwrap
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--dev-bind /dev /dev
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--proc /proc
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--chdir "$(pwd)"
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${optionalString unshareUser "--unshare-user"}
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${optionalString unshareIpc "--unshare-ipc"}
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${optionalString unsharePid "--unshare-pid"}
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${optionalString unshareNet "--unshare-net"}
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${optionalString unshareUts "--unshare-uts"}
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${optionalString unshareCgroup "--unshare-cgroup"}
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${optionalString dieWithParent "--die-with-parent"}
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--ro-bind /nix /nix
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${optionalString privateTmp "--tmpfs /tmp"}
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# Our glibc will look for the cache in its own path in `/nix/store`.
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# As such, we need a cache to exist there, because pressure-vessel
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# depends on the existence of an ld cache. However, adding one
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# globally proved to be a bad idea (see #100655), the solution we
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# settled on being mounting one via bwrap.
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# Also, the cache needs to go to both 32 and 64 bit glibcs, for games
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# of both architectures to work.
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--tmpfs ${glibc}/etc \
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--tmpfs /etc \
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--symlink /etc/ld.so.conf ${glibc}/etc/ld.so.conf \
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--symlink /etc/ld.so.cache ${glibc}/etc/ld.so.cache \
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--ro-bind ${glibc}/etc/rpc ${glibc}/etc/rpc \
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--remount-ro ${glibc}/etc \
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''
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+ optionalString fhsenv.isMultiBuild (indentLines ''
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--tmpfs ${pkgsi686Linux.glibc}/etc \
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--symlink /etc/ld.so.conf ${pkgsi686Linux.glibc}/etc/ld.so.conf \
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--symlink /etc/ld.so.cache ${pkgsi686Linux.glibc}/etc/ld.so.cache \
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--ro-bind ${pkgsi686Linux.glibc}/etc/rpc ${pkgsi686Linux.glibc}/etc/rpc \
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--remount-ro ${pkgsi686Linux.glibc}/etc \
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'')
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+ ''
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"''${ro_mounts[@]}"
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"''${symlinks[@]}"
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"''${auto_mounts[@]}"
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"''${x11_args[@]}"
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${concatStringsSep "\n " extraBwrapArgs}
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${init runScript} ${initArgs}
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)
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exec "''${cmd[@]}"
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'';
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bin = writeShellScript "${name}-bwrap" (bwrapCmd {
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initArgs = ''"$@"'';
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});
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in
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runCommandLocal name
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(
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nameAttrs
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// {
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inherit meta;
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passthru = passthru // {
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env = runCommandLocal "${name}-shell-env" { shellHook = bwrapCmd { }; } ''
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echo >&2 ""
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echo >&2 "*** User chroot 'env' attributes are intended for interactive nix-shell sessions, not for building! ***"
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echo >&2 ""
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exit 1
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'';
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inherit args fhsenv;
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};
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}
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)
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''
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mkdir -p $out/bin
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ln -s ${bin} $out/bin/${executableName}
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${extraInstallCommands}
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''
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