244 lines
6.9 KiB
Nix
244 lines
6.9 KiB
Nix
{ 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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{ name ? null
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, pname ? null
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, version ? null
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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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, extraBwrapArgs ? []
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, unshareUser ? true
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, unshareIpc ? true
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, unsharePid ? true
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, unshareNet ? false
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, unshareUts ? true
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, unshareCgroup ? true
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, dieWithParent ? true
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, ...
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} @ args:
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assert (pname != null || version != null) -> (name == null && pname != null); # You must declare either a name or pname + version (preferred).
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with builtins;
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let
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pname = if args.name != null then args.name else args.pname;
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versionStr = lib.optionalString (version != null) ("-" + version);
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name = pname + versionStr;
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buildFHSEnv = callPackage ./buildFHSEnv.nix { };
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fhsenv = buildFHSEnv (removeAttrs (args // { inherit name; }) [
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"runScript" "extraInstallCommands" "meta" "passthru" "extraBwrapArgs" "dieWithParent"
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"unshareUser" "unshareCgroup" "unshareUts" "unshareNet" "unsharePid" "unshareIpc"
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"pname" "version"
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]);
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etcBindEntries = 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 map (path: "/etc/${path}") files;
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# Create this on the fly instead of linking from /nix
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# The container might have to modify it and re-run ldconfig if there are
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# issues running some binary with LD_LIBRARY_PATH
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createLdConfCache = ''
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cat > /etc/ld.so.conf <<EOF
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/lib
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/lib/x86_64-linux-gnu
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/lib64
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/usr/lib
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/usr/lib/x86_64-linux-gnu
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/usr/lib64
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/lib/i386-linux-gnu
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/lib32
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/usr/lib/i386-linux-gnu
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/usr/lib32
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/run/opengl-driver/lib
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/run/opengl-driver-32/lib
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EOF
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ldconfig &> /dev/null
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'';
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init = run: writeShellScript "${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: lib.concatLines (map (s: " " + s) (filter (s: s != "") (lib.splitString "\n" str)));
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bwrapCmd = { initArgs ? "" }: ''
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ignored=(/nix /dev /proc /etc)
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ro_mounts=()
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symlinks=()
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etc_ignored=()
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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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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' || $path == '/ssl' ]]; then
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continue
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fi
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ro_mounts+=(--ro-bind "$i" "/etc$path")
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etc_ignored+=("/etc$path")
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done
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fi
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for i in ${lib.escapeShellArgs etcBindEntries}; do
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if [[ "''${etc_ignored[@]}" =~ "$i" ]]; then
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continue
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fi
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if [[ -L $i ]]; then
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symlinks+=(--symlink "$(${coreutils}/bin/readlink "$i")" "$i")
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else
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ro_mounts+=(--ro-bind-try "$i" "$i")
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fi
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done
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declare -a auto_mounts
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# loop through all directories in the root
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for dir in /*; do
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# if it is a directory and it is not ignored
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if [[ -d "$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" "$local_socket")
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fi
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cmd=(
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${bubblewrap}/bin/bwrap
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--dev-bind /dev /dev
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--proc /proc
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--chdir "$(pwd)"
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${lib.optionalString unshareUser "--unshare-user"}
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${lib.optionalString unshareIpc "--unshare-ipc"}
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${lib.optionalString unsharePid "--unshare-pid"}
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${lib.optionalString unshareNet "--unshare-net"}
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${lib.optionalString unshareUts "--unshare-uts"}
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${lib.optionalString unshareCgroup "--unshare-cgroup"}
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${lib.optionalString dieWithParent "--die-with-parent"}
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--ro-bind /nix /nix
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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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--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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'' + lib.optionalString (stdenv.isx86_64 && stdenv.isLinux) (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 ${pkgsi686Linux.glibc}/etc \
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'') + ''
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"''${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 "${name}-bwrap" (bwrapCmd { initArgs = ''"$@"''; });
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in runCommandLocal name {
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inherit meta;
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passthru = passthru // {
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env = runCommandLocal "${name}-shell-env" {
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shellHook = bwrapCmd {};
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} ''
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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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mkdir -p $out/bin
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ln -s ${bin} $out/bin/${pname}
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${extraInstallCommands}
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''
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