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nixpkgs/pkgs/build-support/build-fhs-userenv-bubblewrap/default.nix

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{ lib, callPackage, runCommandLocal, writeShellScriptBin, coreutils, bubblewrap }:
args @ {
name
, runScript ? "bash"
, extraInstallCommands ? ""
, meta ? {}
, passthru ? {}
, unshareUser ? true
, unshareIpc ? true
, unsharePid ? true
, unshareNet ? false
, unshareUts ? true
, unshareCgroup ? true
, ...
}:
with builtins;
let
buildFHSEnv = callPackage ./env.nix { };
env = buildFHSEnv (removeAttrs args [
"runScript" "extraInstallCommands" "meta" "passthru"
"unshareUser" "unshareCgroup" "unshareUts" "unshareNet" "unsharePid" "unshareIpc"
]);
etcBindFlags = let
files = [
# NixOS Compatibility
"static"
# Users, Groups, NSS
"passwd"
"group"
"shadow"
"hosts"
"resolv.conf"
"nsswitch.conf"
2021-01-26 00:41:50 +00:00
# User profiles
"profiles"
# Sudo & Su
"login.defs"
"sudoers"
"sudoers.d"
# Time
"localtime"
"zoneinfo"
# Other Core Stuff
"machine-id"
"os-release"
# PAM
"pam.d"
# Fonts
"fonts"
# ALSA
"asound.conf"
# SSL
"ssl/certs"
"pki"
];
in concatStringsSep "\n "
(map (file: "--ro-bind-try /etc/${file} /etc/${file}") files);
init = run: writeShellScriptBin "${name}-init" ''
source /etc/profile
exec ${run} "$@"
'';
bwrapCmd = { initArgs ? "" }: ''
blacklist=(/nix /dev /proc /etc)
ro_mounts=()
for i in ${env}/*; do
path="/''${i##*/}"
if [[ $path == '/etc' ]]; then
continue
fi
ro_mounts+=(--ro-bind "$i" "$path")
blacklist+=("$path")
done
if [[ -d ${env}/etc ]]; then
for i in ${env}/etc/*; do
path="/''${i##*/}"
# NOTE: we're binding /etc/fonts from the host so we don't want to
# override it with a path from the FHS environment.
if [[ $path == '/fonts' ]]; then
continue
fi
ro_mounts+=(--ro-bind "$i" "/etc$path")
done
fi
declare -a auto_mounts
# loop through all directories in the root
for dir in /*; do
# if it is a directory and it is not in the blacklist
if [[ -d "$dir" ]] && [[ ! "''${blacklist[@]}" =~ "$dir" ]]; then
# add it to the mount list
auto_mounts+=(--bind "$dir" "$dir")
fi
done
cmd=(
${bubblewrap}/bin/bwrap
--dev-bind /dev /dev
--proc /proc
--chdir "$(pwd)"
${lib.optionalString unshareUser "--unshare-user"}
${lib.optionalString unshareIpc "--unshare-ipc"}
${lib.optionalString unsharePid "--unshare-pid"}
${lib.optionalString unshareNet "--unshare-net"}
${lib.optionalString unshareUts "--unshare-uts"}
${lib.optionalString unshareCgroup "--unshare-cgroup"}
--die-with-parent
--ro-bind /nix /nix
${etcBindFlags}
"''${ro_mounts[@]}"
"''${auto_mounts[@]}"
${init runScript}/bin/${name}-init ${initArgs}
)
exec "''${cmd[@]}"
'';
bin = writeShellScriptBin name (bwrapCmd { initArgs = ''"$@"''; });
in runCommandLocal name {
inherit meta;
passthru = passthru // {
env = runCommandLocal "${name}-shell-env" {
shellHook = bwrapCmd {};
} ''
echo >&2 ""
echo >&2 "*** User chroot 'env' attributes are intended for interactive nix-shell sessions, not for building! ***"
echo >&2 ""
exit 1
'';
};
} ''
mkdir -p $out/bin
ln -s ${bin}/bin/${name} $out/bin/${name}
${extraInstallCommands}
''