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{ lib, callPackage, runCommandLocal, writeShellScriptBin, glibc, pkgsi686Linux, coreutils, bubblewrap }:
let buildFHSEnv = callPackage ./env.nix { }; in
args @ {
name
, runScript ? "bash"
, extraInstallCommands ? ""
, meta ? {}
, passthru ? {}
, unshareUser ? true
, unshareIpc ? true
, unsharePid ? true
, unshareNet ? false
, unshareUts ? true
, unshareCgroup ? true
, dieWithParent ? true
, ...
}:
with builtins;
let
buildFHSEnv = callPackage ./env.nix { };
env = buildFHSEnv (removeAttrs args [
"runScript" "extraInstallCommands" "meta" "passthru" "dieWithParent"
"unshareUser" "unshareCgroup" "unshareUts" "unshareNet" "unsharePid" "unshareIpc"
]);
etcBindFlags = let
files = [
# NixOS Compatibility
"static"
"nix" # mainly for nixUnstable users, but also for access to nix/netrc
# Shells
"bashrc"
"zshenv"
"zshrc"
"zinputrc"
"zprofile"
# Users, Groups, NSS
"passwd"
"group"
"shadow"
"hosts"
"resolv.conf"
"nsswitch.conf"
# 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
"alsa"
"asound.conf"
# SSL
"ssl/certs"
"pki"
];
in concatStringsSep "\n "
(map (file: "--ro-bind-try /etc/${file} /etc/${file}") files);
# Create this on the fly instead of linking from /nix
# The container might have to modify it and re-run ldconfig if there are
# issues running some binary with LD_LIBRARY_PATH
createLdConfCache = ''
cat > /etc/ld.so.conf <<EOF
/lib
/lib/x86_64-linux-gnu
/lib64
/usr/lib
/usr/lib/x86_64-linux-gnu
/usr/lib64
/lib/i386-linux-gnu
/lib32
/usr/lib/i386-linux-gnu
/usr/lib32
EOF
ldconfig &> /dev/null
'';
init = run: writeShellScriptBin "${name}-init" ''
source /etc/profile
${createLdConfCache}
exec ${run} "$@"
'';
bwrapCmd = { initArgs ? "" }: ''
blacklist=(/nix /dev /proc /etc)
ro_mounts=()
symlinks=()
for i in ${env}/*; do
path="/''${i##*/}"
if [[ $path == '/etc' ]]; then
:
elif [[ -L $i ]]; then
symlinks+=(--symlink "$(${coreutils}/bin/readlink "$i")" "$path")
blacklist+=("$path")
else
ro_mounts+=(--ro-bind "$i" "$path")
blacklist+=("$path")
fi
done
if [[ -d ${env}/etc ]]; then
for i in ${env}/etc/*; do
path="/''${i##*/}"
# NOTE: we're binding /etc/fonts and /etc/ssl/certs from the host so we
# don't want to override it with a path from the FHS environment.
if [[ $path == '/fonts' || $path == '/ssl' ]]; then
continue
fi
ro_mounts+=(--ro-bind "$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"}
${lib.optionalString dieWithParent "--die-with-parent"}
--ro-bind /nix /nix
# Our glibc will look for the cache in its own path in `/nix/store`.
# As such, we need a cache to exist there, because pressure-vessel
# depends on the existence of an ld cache. However, adding one
# globally proved to be a bad idea (see #100655), the solution we
# settled on being mounting one via bwrap.
# Also, the cache needs to go to both 32 and 64 bit glibcs, for games
# of both architectures to work.
--tmpfs ${glibc}/etc \
--symlink /etc/ld.so.conf ${glibc}/etc/ld.so.conf \
--symlink /etc/ld.so.cache ${glibc}/etc/ld.so.cache \
--ro-bind ${glibc}/etc/rpc ${glibc}/etc/rpc \
--remount-ro ${glibc}/etc \
--tmpfs ${pkgsi686Linux.glibc}/etc \
--symlink /etc/ld.so.conf ${pkgsi686Linux.glibc}/etc/ld.so.conf \
--symlink /etc/ld.so.cache ${pkgsi686Linux.glibc}/etc/ld.so.cache \
--ro-bind ${pkgsi686Linux.glibc}/etc/rpc ${pkgsi686Linux.glibc}/etc/rpc \
--remount-ro ${pkgsi686Linux.glibc}/etc \
${etcBindFlags}
"''${ro_mounts[@]}"
"''${symlinks[@]}"
"''${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}
''
|