142 lines
3.4 KiB
Nix
142 lines
3.4 KiB
Nix
{ lib, callPackage, runCommandLocal, writeShellScriptBin, coreutils, bubblewrap }:
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args @ {
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name
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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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, 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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, ...
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}:
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with builtins;
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let
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buildFHSEnv = callPackage ./env.nix { };
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env = buildFHSEnv (removeAttrs args [
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"runScript" "extraInstallCommands" "meta" "passthru"
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"unshareUser" "unshareCgroup" "unshareUts" "unshareNet" "unsharePid" "unshareIpc"
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]);
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etcBindFlags = let
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files = [
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# NixOS Compatibility
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"static"
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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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"asound.conf"
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# SSL
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"ssl/certs"
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"pki"
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];
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in concatStringsSep "\n "
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(map (file: "--ro-bind-try /etc/${file} /etc/${file}") files);
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init = run: writeShellScriptBin "${name}-init" ''
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source /etc/profile
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exec ${run} "$@"
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'';
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bwrapCmd = { initArgs ? "" }: ''
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blacklist=(/nix /dev /proc /etc)
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ro_mounts=()
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for i in ${env}/*; do
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path="/''${i##*/}"
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if [[ $path == '/etc' ]]; then
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continue
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fi
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ro_mounts+=(--ro-bind "$i" "$path")
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blacklist+=("$path")
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done
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if [[ -d ${env}/etc ]]; then
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for i in ${env}/etc/*; do
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path="/''${i##*/}"
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# NOTE: we're binding /etc/fonts from the host so we don't want to
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# override it with a path from the FHS environment.
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if [[ $path == '/fonts' ]]; then
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continue
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fi
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ro_mounts+=(--ro-bind "$i" "/etc$path")
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done
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fi
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declare -a auto_mounts
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# loop through all directories in the root
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for dir in /*; do
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# if it is a directory and it is not in the blacklist
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if [[ -d "$dir" ]] && [[ ! "''${blacklist[@]}" =~ "$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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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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--die-with-parent
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--ro-bind /nix /nix
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${etcBindFlags}
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"''${ro_mounts[@]}"
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"''${auto_mounts[@]}"
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${init runScript}/bin/${name}-init ${initArgs}
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)
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exec "''${cmd[@]}"
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'';
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bin = writeShellScriptBin name (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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};
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} ''
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mkdir -p $out/bin
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ln -s ${bin}/bin/${name} $out/bin/${name}
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${extraInstallCommands}
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''
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