master..982cb12 · nix-bundle

git.iko.soy/nix-bundle

on 982cb12 help sign in

AppRun.c+1−9

since splitsnapshots

unifiedsplit

@@ -207,11 +207,6 @@ int main(int argc, char *argv[]) {

207 err_exit("mount(%s, %s)", usrdir, path_buf);

208 }

209

210− snprintf(path_buf, sizeof(path_buf), "%s/bin", rootdir);

211− if (symlink("/usr/bin", path_buf) < 0) {

212− err_exit("symlink(/usr/bin, %s)", path_buf);

213− }

214−

215 // fixes issue #1 where writing to /proc/self/gid_map fails

210 // fixes issue #1 where writing to /proc/self/gid_map fails

216 // see user_namespaces(7) for more documentation

211 // see user_namespaces(7) for more documentation

217 int fd_setgroups = open("/proc/self/setgroups", O_WRONLY);

212 int fd_setgroups = open("/proc/self/setgroups", O_WRONLY);

@@ -231,10 +226,8 @@ int main(int argc, char *argv[]) {

231 err_exit("chroot(%s)", rootdir);

226 err_exit("chroot(%s)", rootdir);

232 }

227 }

233

228

234− char *pwddir = getenv("PWD");

235− chdir(pwddir);

229+ chdir("/");

236

230

237− SAVE_ENV_VAR(PWD);

238 SAVE_ENV_VAR(DBUS_SESSION_BUS_ADDRESS);

231 SAVE_ENV_VAR(DBUS_SESSION_BUS_ADDRESS);

239 SAVE_ENV_VAR(USER);

232 SAVE_ENV_VAR(USER);

240 SAVE_ENV_VAR(HOSTNAME);

233 SAVE_ENV_VAR(HOSTNAME);

@@ -250,7 +243,6 @@ int main(int argc, char *argv[]) {

250

243

251 clearenv();

244 clearenv();

252

245

253− LOAD_ENV_VAR(PWD);

254 LOAD_ENV_VAR(DBUS_SESSION_BUS_ADDRESS);

246 LOAD_ENV_VAR(DBUS_SESSION_BUS_ADDRESS);

255 LOAD_ENV_VAR(USER);

247 LOAD_ENV_VAR(USER);

256 LOAD_ENV_VAR(HOSTNAME);

248 LOAD_ENV_VAR(HOSTNAME);

README.md+1−14

@@ -35,27 +35,14 @@ Some others to try:

35./nix-bundle.sh nano /bin/nano

36```

38−```sh

39−./nix-bundle.sh emacs /bin/emacs

40−```

41−

42−Or if you want to try graphical applications:

43−

44−```sh

45−# Simple X game. Very few dependencies. Quick to build and load. ~13MB

46−./nix-bundle.sh xskat /bin/xskat

47−```

48−

49```sh

38```sh

50./nix-bundle.sh firefox /bin/firefox

39./nix-bundle.sh firefox /bin/firefox

51```

40```

53```sh

42```sh

54−# SDL-based game. ~228MB

55−./nix-bundle.sh ivan /bin/ivan

43+./nix-bundle.sh emacs /bin/emacs

56```

44```

58−

59## Self-bundling (meta)

46## Self-bundling (meta)

61Starting with v0.1.3, you can bundle nix-bundle! To do this, just use nix-bundle normally:

48Starting with v0.1.3, you can bundle nix-bundle! To do this, just use nix-bundle normally:

appdir.nix+4−4

@@ -1,4 +1,4 @@

1−{ stdenv, lib, fetchurl, muslPkgs, perl, pathsFromGraph, fetchFromGitHub, coreutils, bash }:

1+{ stdenv, fetchurl, muslPkgs, perl, pathsFromGraph, fetchFromGitHub, coreutils, bash }:

3let

4 AppRun = targets: muslPkgs.stdenv.mkDerivation {

@@ -8,7 +8,7 @@ let

9 buildPhase = ''

10 CC="$CC -O2 -Wall -Wno-deprecated-declarations -Wno-unused-result -static"

11− $CC ${./AppRun.c} -o AppRun -DENV_PATH='"${lib.makeBinPath targets}"'

11+ $CC ${./AppRun.c} -o AppRun -DENV_PATH='"${stdenv.lib.makeBinPath targets}"'

12 '';

14 installPhase = ''

@@ -63,12 +63,12 @@ in

64 # icons

65 if [ -d ${target}/share/icons ]; then

66− icon=$(find ${target}/share/icons -name "${name}*.png" | head -n1)

66+ icon=$(find ${target}/share/icons -name "${name}.png" | head -n1)

67 if ! [ -z "$icon" ]; then

68 ln -s .$icon

69 ln -s .$icon .DirIcon

70 else

71− icon=$(find ${target}/share/icons -name "${name}*.svg" | head -n1)

71+ icon=$(find ${target}/share/icons -name "${name}.svg" | head -n1)

72 if ! [ -z "$icon" ]; then

73 ln -s .$icon

74 ln -s .$icon .DirIcon

appimage-bundle.nixdeleted−61

@@ -1,61 +0,0 @@

1−# use like this:

2−# nix-build appimage-bundle.nix --argstr package hello --argstr exec hello

3−# nix-build appimage-bundle.nix --arg package 'with import <nixpkgs>{}; writers.writePython3Bin "helloThere.py" {} "print(1)\n"' --argstr exec helloThere.py

4−

5−

6−{nixpkgs ? import <nixpkgs>{},

7−package,

8−exec,

9−... }:

10−let

11− appimage_src = drv : exec : with nixpkgs;

12− self.stdenv.mkDerivation rec {

13− name = drv.name + "-appdir";

14− env = buildEnv {

15− inherit name;

16− paths = buildInputs;

17− };

18− src = env;

19− inherit exec;

20− buildInputs = [ drv ];

21− buildCommand = ''

22− mkdir -p $out/share/icons/hicolor/256x256/apps

23− mkdir -p $out/share/applications

24−

25− shopt -s extglob

26− ln -s ${env}/!(share) $out/

27− ln -s ${env}/share/* $out/share/

28−

29− touch $out/share/icons/hicolor/256x256/apps/${drv.name}.png

30− touch $out/share/icons/${drv.name}.png

31−

32− cat <<EOF > $out/share/applications/${drv.name}.desktop

33− [Desktop Entry]

34− Type=Application

35− Version=1.0

36− Name=${drv.name}

37− Path=${env}

38− Icon=${drv.name}

39− Exec=$exec

40− Terminal=true

41− EOF

42− '';

43− system = builtins.currentSystem;

44− };

45−

46−in

47− let results =

48− if (nixpkgs.lib.isDerivation package && !(nixpkgs.lib.isString package))

49− then {

50− name = package.name;

51− target = appimage_src package "${exec}";

52− extraTargets = [];

53− }

54− else {

55− name = nixpkgs."${package}".name;

56− target = appimage_src (nixpkgs."${package}") "${exec}";

57− extraTargets = [];

58− };

59− in

60− with (import (./appimage-top.nix){nixpkgs' = nixpkgs.path;});

61− (appimage (appdir results )).overrideAttrs (old: {name = results.name;})

appimagetool.nix+2−2

@@ -1,4 +1,4 @@

1−{ stdenv, lib, fetchurl, fuse, zlib, squashfsTools, glib }:

1+{ stdenv, fetchurl, fuse, zlib, squashfsTools, glib }:

3# This is from some binaries.

@@ -37,7 +37,7 @@ in stdenv.mkDerivation rec {

37 for x in $out/bin/*; do

38 patchelf \

39 --set-interpreter ${dynamicLinker} \

40− --set-rpath ${lib.makeLibraryPath [ zlib stdenv.glibc.out fuse glib ]} \

40+ --set-rpath ${stdenv.lib.makeLibraryPath [ zlib stdenv.glibc.out fuse glib ]} \

41 $x

42 done

43 '';

default.nix+26−46

@@ -2,29 +2,12 @@

3with nixpkgs;

5−let

6− arx' = haskellPackages.arx.overrideAttrs (o: {

7− patchPhase = (o.patchPhase or "") + ''

8− substituteInPlace model-scripts/tmpx.sh \

9− --replace /tmp/ \$HOME/.cache/

10− '';

11− });

12−in rec {

5+rec {

13− toStorePath = target:

14− # If a store path has been given but is not a derivation, add the missing context

15− # to it so it will be propagated properly as a build input.

16− if !(lib.isDerivation target) && lib.isStorePath target then

17− let path = toString target; in

18− builtins.appendContext path { "${path}" = { path = true; }; }

19− # Otherwise, add to the store. This takes care of appending the store path

20− # in the context automatically.

21− else "${target}";

22−

23 arx = { archive, startup}:

6 arx = { archive, startup}:

24 stdenv.mkDerivation {

7 stdenv.mkDerivation {

25 name = "arx";

8 name = "arx";

26 buildCommand = ''

9 buildCommand = ''

27− ${arx'}/bin/arx tmpx --shared -rm! ${archive} -o $out // ${startup}

10+ ${haskellPackages.arx}/bin/arx tmpx ${archive} -o $out // ${startup}

28 chmod +x $out

11 chmod +x $out

29 '';

12 '';

30 };

13 };

@@ -45,12 +28,10 @@ in rec {

45 };

28 };

47 # TODO: eventually should this go in nixpkgs?

30 # TODO: eventually should this go in nixpkgs?

48− nix-user-chroot = lib.makeOverridable stdenv.mkDerivation {

31+ nix-user-chroot = stdenv.lib.makeOverridable stdenv.mkDerivation {

49 name = "nix-user-chroot-2c52b5f";

32 name = "nix-user-chroot-2c52b5f";

50 src = ./nix-user-chroot;

33 src = ./nix-user-chroot;

52− makeFlags = [];

53−

54 # hack to use when /nix/store is not available

35 # hack to use when /nix/store is not available

55 postFixup = ''

36 postFixup = ''

56 exe=$out/bin/nix-user-chroot

37 exe=$out/bin/nix-user-chroot

@@ -68,8 +49,6 @@ in rec {

69 runHook postInstall

50 runHook postInstall

70 '';

51 '';

71−

72− meta.platforms = lib.platforms.linux;

73 };

52 };

75 makebootstrap = { targets, startup }:

54 makebootstrap = { targets, startup }:

@@ -80,40 +59,41 @@ in rec {

80 };

59 };

81 };

60 };

83− makeStartup = { target, nixUserChrootFlags, nix-user-chroot', run, initScript }:

62+ makeStartup = { target, nixUserChrootFlags, nix-user-chroot', run }:

84− let

85− # Avoid re-adding a store path into the store

86− path = toStorePath target;

87− in

88 writeScript "startup" ''

63 writeScript "startup" ''

89− #!/bin/sh

64+ #!/bin/sh

90− ${initScript}

91− .${nix-user-chroot'}/bin/nix-user-chroot -n ./nix ${nixUserChrootFlags} -- ${path}${run} "$@"

65+ .${nix-user-chroot'}/bin/nix-user-chroot -n ./nix ${nixUserChrootFlags} -- ${target}${run} $@

92 '';

66 '';

94− nix-bootstrap = { target, extraTargets ? [], run, nix-user-chroot' ? nix-user-chroot, nixUserChrootFlags ? "", initScript ? "" }:

68+ nix-bootstrap = { target, extraTargets ? [], run, nix-user-chroot' ? nix-user-chroot, nixUserChrootFlags ? "" }:

95 let

69 let

96− script = makeStartup { inherit target nixUserChrootFlags nix-user-chroot' run initScript; };

70+ script = makeStartup { inherit target nixUserChrootFlags nix-user-chroot' run; };

97 in makebootstrap {

71 in makebootstrap {

98− startup = ".${script} '\"$@\"'";

72+ startup = ".${script}";

99 targets = [ "${script}" ] ++ extraTargets;

73 targets = [ "${script}" ] ++ extraTargets;

100 };

74 };

101

76+ # special case handling because of impurities in nix bootstrap

77+ # anything that needs Nix will have to have these setup before they can be run

102− nix-bootstrap-nix = {target, run, extraTargets ? []}:

78+ nix-bootstrap-nix = let

103− nix-bootstrap-path {

79+ nix-user-chroot' = nix-user-chroot.override {

104− inherit target run;

80+ buildInputs = [ cacert gnutar bzip2 gzip coreutils ];

105− extraTargets = [ gnutar bzip2 xz gzip coreutils bash ];

81+ makeFlags = [

106− };

82+ ''NIX_SSL_CERT_FILE="${cacert}/etc/ssl/certs/ca-bundle.crt"''

83+ ''NIX_PATH="nixpkgs=https://github.com/matthewbauer/nixpkgs/archive/nix-bundle.tar.gz"''

84+ ''ENV_PATH="${stdenv.lib.makeBinPath [ coreutils gnutar bzip2 gzip bash ]}"''

85+ ];

86+ }; in { target, extraTargets ? [], run }: nix-bootstrap { inherit target extraTargets run nix-user-chroot'; };

107

108 # special case adding path to the environment before launch

88 # special case adding path to the environment before launch

109 nix-bootstrap-path = let

89 nix-bootstrap-path = let

110− nix-user-chroot'' = targets: nix-user-chroot.overrideDerivation (o: {

90+ nix-user-chroot'' = targets: nix-user-chroot.override {

111− buildInputs = o.buildInputs ++ targets;

91+ buildInputs = targets;

112− makeFlags = o.makeFlags ++ [

92+ makeFlags = [

113− ''ENV_PATH="${lib.makeBinPath targets}"''

93+ ''ENV_PATH="${stdenv.lib.makeBinPath targets}"''

114 ];

94 ];

115− }); in { target, extraTargets ? [], run, initScript ? "" }: nix-bootstrap {

95+ }; in { target, extraTargets ? [], run }: nix-bootstrap {

116− inherit target extraTargets run initScript;

96+ inherit target extraTargets run;

117 nix-user-chroot' = nix-user-chroot'' extraTargets;

97 nix-user-chroot' = nix-user-chroot'' extraTargets;

118 };

98 };

119}

99}

flake.nixdeleted−26

@@ -1,26 +0,0 @@

1−{

2− description = "The purely functional package manager";

3−

4− inputs.nixpkgs.url = "nixpkgs/nixos-20.03-small";

5−

6− outputs = { self, nixpkgs }: let

7− systems = [ "x86_64-linux" "i686-linux" "aarch64-linux" ];

8− forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f system);

9− in {

10− bundlers = {

11− nix-bundle = { program, system }: let

12− nixpkgs' = nixpkgs.legacyPackages.${system};

13− nix-bundle = import self { nixpkgs = nixpkgs'; };

14− script = nixpkgs'.writeScript "startup" ''

15− #!/bin/sh

16− .${nix-bundle.nix-user-chroot}/bin/nix-user-chroot -n ./nix -- ${program} "$@"

17− '';

18− in nix-bundle.makebootstrap {

19− targets = [ script ];

20− startup = ".${builtins.unsafeDiscardStringContext script} '\"$@\"'";

21− };

22− };

23−

24− defaultBundler = self.bundlers.nix-bundle;

25− };

26−}

nix-bootstrap.sh+13−13

@@ -1,35 +1,35 @@

1#!/bin/sh

3+cmd=sh

3−if [ $# -gt 0 ]; then

4+if ! [ $# -eq 0 ]; then

4− set -- sh

5+ cmd=$@

5fi

6fi

7# should download this in the future

8# should download this in the future

8# but the mirror is down

9# but the mirror is down

9−proot=$(dirname "$0")/proot-$(uname -p)

10+proot=`dirname $0`/proot-`uname -p`

10export PROOT_NO_SECCOMP=1

11export PROOT_NO_SECCOMP=1

12nixdir=$HOME/.nix

13nixdir=$HOME/.nix

14OLD_NIX_PATH=$NIX_PATH

15OLD_NIX_PATH=$NIX_PATH

15−# shellcheck disable=SC1090

16−if [ -e "$HOME/.nix-profile/etc/profile.d/nix.sh" ]; then . "$HOME/.nix-profile/etc/profile.d/nix.sh"; fi

16+if [ -e $HOME/.nix-profile/etc/profile.d/nix.sh ]; then . $HOME/.nix-profile/etc/profile.d/nix.sh; fi

17−if [ -n "$OLD_NIX_PATH" ]; then NIX_PATH="$OLD_NIX_PATH"; fi

17+if ! [ -z "$OLD_NIX_PATH" ]; then NIX_PATH="$OLD_NIX_PATH"; fi

19if [ -z "$IN_PROOT" ]; then

20 export IN_PROOT=1

22− if ! [ -d "$nixdir" ]; then

22+ if ! [ -d $nixdir ]; then

23− mkdir -p "$nixdir"

23+ mkdir -p $nixdir

24 s=$(mktemp)

25− curl https://nixos.org/nix/install -o "$s"

25+ curl https://nixos.org/nix/install -o $s

26− $proot -b "$nixdir:/nix" "$0" sh "$s"

26+ $proot -b $nixdir:/nix $0 sh $s

27 fi

29− $proot -b "$nixdir:/nix" "$0" "$@"

29+ $proot -b $nixdir:/nix $0 $cmd

31 export IN_PROOT=

32 exit

33−elif [ $# -gt 0 ]; then

33+elif ! [ $# -eq 0 ]; then

34− exec "$@"

34+ exec $cmd

35fi

nix-bundle.sh+7−12

@@ -8,9 +8,6 @@ Usage: $0 TARGET EXECUTABLE

8Create a single-file bundle from the nixpkgs attribute "TARGET".

9EXECUTABLE should be relative to the TARGET's output path.

11−The TARGET is either an attribute in nixpkgs, or an absolute path to the

12−store.

13−

14For example:

11For example:

16$ $0 hello /bin/hello

13$ $0 hello /bin/hello

@@ -22,7 +19,7 @@ EOF

22 exit 1

19 exit 1

23fi

20fi

25−nix_file=$(dirname "$0")/default.nix

22+nix_file=`dirname $0`/default.nix

27target="$1"

24target="$1"

28shift

25shift

@@ -39,25 +36,23 @@ exec="$1"

39shift

36shift

41bootstrap=nix-bootstrap

38bootstrap=nix-bootstrap

42−if [ "$target" = "nix-bundle" ] || [ "$target" = "nixStable" ] || [ "$target" = "nixUnstable" ] || [ "$target" = "nix" ]; then

39+if [ "$target" = "nix-bundle" ] || [ "$target" = "nixStable" ] || [ "$target" = "nixUnstable" ]; then

43 bootstrap=nix-bootstrap-nix

40 bootstrap=nix-bootstrap-nix

44−elif [ -n "$extraTargets" ]; then

41+elif ! [ -z "$extraTargets" ]; then

45 bootstrap=nix-bootstrap-path

42 bootstrap=nix-bootstrap-path

46fi

43fi

48expr="with import <nixpkgs> {}; with import $nix_file {}; $bootstrap { target = $target; extraTargets = [ $extraTargets ]; run = \"$exec\"; }"

45expr="with import <nixpkgs> {}; with import $nix_file {}; $bootstrap { target = $target; extraTargets = [ $extraTargets ]; run = \"$exec\"; }"

50−drv=$(nix-instantiate --no-gc-warning -E "$expr")

47+out=$(nix-store --no-gc-warning -r $(nix-instantiate --no-gc-warning -E "$expr"))

51−

52−out=$(nix-store --no-gc-warning --realize "$drv")

54if [ -z "$out" ]; then

49if [ -z "$out" ]; then

55 >&2 echo "$0 failed. Exiting."

50 >&2 echo "$0 failed. Exiting."

56 exit 1

51 exit 1

57elif [ -t 1 ]; then

52elif [ -t 1 ]; then

58− filename=$(basename "$exec")

53+ filename=$(basename $exec)

59 echo "Nix bundle created at $filename."

54 echo "Nix bundle created at $filename."

60− cp -f "$out" "$filename"

55+ cp -f $out $filename

61else

56else

62− echo "$out"

57+ cat $out

63fi

58fi

nix-run.sh+21−23

@@ -18,11 +18,11 @@ if [ -z "$1" ]; then

18 exit 1

19fi

21−pkg="$1"

21+pkg=$1

22shift

24# A second argument will provide a hint to run

25−if [ -n "$1" ]; then

25+if ! [ -z "$1" ]; then

26 name="$1"

27 shift

28else

@@ -31,7 +31,7 @@ fi

32expr="with import <nixpkgs> {}; let x = ($pkg); in x"

33path=$(nix-instantiate --no-gc-warning -E "$expr")

34−out=$(nix-store --no-gc-warning -r "$path")

34+out=$(nix-store --no-gc-warning -r $path)

36if [ -z "$out" ]; then

37 >&2 echo "Could not evaluate $pkg to a Nix drv."

@@ -43,7 +43,7 @@ run_darwin_app () {

43 dir="$1"

44 shift

46− open -a "$dir" --args "$@"

46+ open -a "$dir" --args $@

47}

49# Run FILE as a Freedesktop application

@@ -53,16 +53,14 @@ run_linux_desktop_app () {

53 file="$1"

54 shift

56− cmd=$(grep '^Exec' "$file" | tail -1 | \

56+ cmd=$(grep '^Exec' $file | tail -1 | \

57− sed 's/Exec=//;s/^"//;s/" *$//')

57+ sed 's/Exec=//;s/^"//;s/" *$/')

59− if [ "$#" -gt 0 ]; then

59+ if ! [ -z "$@" ]; then

60− cmd=$(echo "$cmd" | sed "s/%[fu]/$1/;s/%[FU]/$*/")

60+ cmd=$(echo "$cmd" | sed "s/%[fu]/$1/;s/%[FU]/$@/")

61 fi

63 cmd=$(echo "$cmd" | sed "s/%k/$desktop/;s/%.//")

64−

65− "$cmd" "$@"

66}

64}

68# Run FILE as an ordinary binary

66# Run FILE as an ordinary binary

@@ -70,30 +68,30 @@ run_bin () {

70 file="$1"

68 file="$1"

71 shift

69 shift

73− "$file" "$@"

71+ $file $@

74}

72}

76if [ -x "$out/nix-support/run" ]; then

74if [ -x "$out/nix-support/run" ]; then

77− run_bin "$out/nix-support/run" "$@"

75+ run_bin "$out/nix-support/run" $@

78elif [ -x "$out/bin/run" ]; then

76elif [ -x "$out/bin/run" ]; then

79− run_bin "$out/bin/run" "$@"

77+ run_bin "$out/bin/run" $@

80elif [ "$(uname)" = Darwin ] && [ -d "$out/Applications/$name.app" ]; then

78elif [ "$(uname)" = Darwin ] && [ -d "$out/Applications/$name.app" ]; then

81− run_darwin_app "$out/Applications/$name.app" "$@"

79+ run_darwin_app "$out/Applications/$name.app" $@

82−elif [ "$(uname)" = Darwin ] && [ -d "$out"/Applications/*.app ]; then

80+elif [ "$(uname)" = Darwin ] && [ -d $out/Applications/*.app ]; then

83− for f in "$out"/Applications/*.app; do

81+ for f in $out/Applications/*.app; do

84− run_darwin_app "$f" "$@"

82+ run_darwin_app "$f" $@

85 done

83 done

86elif [ -f "$out/share/applications/$name.desktop" ]; then

84elif [ -f "$out/share/applications/$name.desktop" ]; then

87− run_linux_desktop_app "$out/share/applications/$name.desktop" "$@"

85+ run_linux_desktop_app "$out/share/applications/$name.desktop" $@

88−elif [ -d "$out"/share/applications ]; then

86+elif [ -d $out/share/applications ]; then

89− for f in "$out"/share/applications/*.desktop; do

87+ for f in $out/share/applications/*.desktop; do

90 run_linux_desktop_app "$f"

88 run_linux_desktop_app "$f"

91 done

89 done

92elif [ -x "$out/bin/$name" ]; then

90elif [ -x "$out/bin/$name" ]; then

93− run_bin "$out/bin/$name" "$@"

91+ run_bin "$out/bin/$name" $@

94elif [ -d "$out/bin" ]; then

92elif [ -d "$out/bin" ]; then

95− for bin in "$out"/bin/*; do

93+ for bin in $out/bin/*; do

96− run_bin "$bin" "$@"

94+ run_bin "$bin" $@

97 done

95 done

98else

96else

99 >&2 echo "Cannot find a way to run path $out."

97 >&2 echo "Cannot find a way to run path $out."

nix-user-chroot/Makefile+3−1

@@ -1,4 +1,6 @@

1+NIX_PATH ?= "nixpkgs=https://github.com/NixOS/nixpkgs/archive/master.tar.gz"

2+NIX_SSL_CERT_FILE ?= "/homeless-shelter"

1ENV_PATH ?= ""

3ENV_PATH ?= ""

3nix-user-chroot: main.cpp

5nix-user-chroot: main.cpp

4− g++ -o nix-user-chroot -DENV_PATH='$(ENV_PATH)' main.cpp

6+ g++ -o nix-user-chroot -DNIX_PATH='$(NIX_PATH)' -DNIX_SSL_CERT_FILE='$(NIX_SSL_CERT_FILE)' -DENV_HOME='$(ENV_HOME)' -DENV_PATH='$(ENV_PATH)' main.cpp

nix-user-chroot/main.cpp+41−115

@@ -26,10 +26,6 @@

26using namespace std;

28#define err_exit(format, ...) { fprintf(stderr, format ": %s\n", ##__VA_ARGS__, strerror(errno)); exit(EXIT_FAILURE); }

29−static int child_proc(const char *rootdir, const char *nixdir, uint8_t clear_env, list<struct DirMapping> dirMappings, list<struct SetEnv> envMappings, const char *executable, char * const new_argv[]);

30−

31−volatile uint8_t child_died = 0;

32−int child_pid = 0;

34static void usage(const char *pname) {

30static void usage(const char *pname) {

35 fprintf(stderr, "Usage: %s -n <nixpath> -- <command>\n", pname);

31 fprintf(stderr, "Usage: %s -n <nixpath> -- <command>\n", pname);

@@ -37,7 +33,6 @@ static void usage(const char *pname) {

37 fprintf(stderr, "\t-m <src>:<src>\tmap src on the host to dest in the sandbox\n");

33 fprintf(stderr, "\t-m <src>:<src>\tmap src on the host to dest in the sandbox\n");

38 fprintf(stderr, "\t-d\tdelete all default dir mappings, may break things\n");

34 fprintf(stderr, "\t-d\tdelete all default dir mappings, may break things\n");

39 fprintf(stderr, "\t-p <var>\tpreserve the value of a variable across the -c clear\n");

35 fprintf(stderr, "\t-p <var>\tpreserve the value of a variable across the -c clear\n");

40− fprintf(stderr, "\t-e\tadd an /escape-hatch to the sandbox, and run (outside the sandbox) any strings written to it\n");

42 exit(EXIT_FAILURE);

37 exit(EXIT_FAILURE);

43}

38}

@@ -96,15 +91,8 @@ struct DirMapping parseMapping(string input) {

96 return (struct DirMapping){ src, dest };

91 return (struct DirMapping){ src, dest };

97}

92}

99−static void handle_child_death(int signo, siginfo_t *info, void *context) {

100− if ( (child_pid == 0) || (info->si_pid == child_pid) ) {

101− child_died = 1;

102− }

103−}

104−

105int main(int argc, char *argv[]) {

94int main(int argc, char *argv[]) {

106 uint8_t clear_env = 0;

95 uint8_t clear_env = 0;

107− uint8_t enable_escape_hatch = 0;

108 char *nixdir = NULL;

96 char *nixdir = NULL;

109 list<struct DirMapping> dirMappings;

97 list<struct DirMapping> dirMappings;

110 list<struct SetEnv> envMappings;

98 list<struct SetEnv> envMappings;

@@ -117,20 +105,14 @@ int main(int argc, char *argv[]) {

117 x("run");

105 x("run");

118 x("tmp");

106 x("tmp");

119 x("var");

107 x("var");

120− x("etc");

121− x("usr");

122− x("home");

123− x("root");

124#undef x

108#undef x

125

109

126 int opt;

110 int opt;

127− while ((opt = getopt(argc, argv, "cen:m:dp:")) != -1) {

111+ while ((opt = getopt(argc, argv, "cn:m:dp:")) != -1) {

128 switch (opt) {

112 switch (opt) {

129 case 'c':

113 case 'c':

130 clear_env = 1;

114 clear_env = 1;

131− break;

115+ puts("clearing env");

132− case 'e':

133− enable_escape_hatch = 1;

134 break;

116 break;

135 case 'n':

117 case 'n':

136 // determine absolute directory for nix dir

118 // determine absolute directory for nix dir

@@ -179,74 +161,13 @@ int main(int argc, char *argv[]) {

179 err_exit("mkdtemp(%s)", template_);

161 err_exit("mkdtemp(%s)", template_);

180 }

162 }

181

163

182− int unrace[2];

183−

184− if (pipe(unrace)) {

185− err_exit("pipe()");

186− }

187−

188− struct sigaction handle_child;

189− handle_child.sa_sigaction = handle_child_death;

190− handle_child.sa_flags = SA_SIGINFO;

191−

192− struct sigaction old_handler;

193− if (sigaction(SIGCHLD, &handle_child, &old_handler)) {

194− err_exit("sigaction()");

195− }

196−

197− int child;

198− child = child_pid = fork();

199− if (child < 0) {

200− err_exit("fork()");

201− } else if (child == 0) {

202− sigaction(SIGCHLD, &old_handler, NULL);

203− close(unrace[1]);

204− char buf[10];

205− read(unrace[0], buf, 10);

206− close(unrace[0]);

207− return child_proc(rootdir, nixdir, clear_env, dirMappings, envMappings, argv[optind], argv + optind);

208− } else {

209− close(unrace[0]);

210− char fifopath[PATH_MAX];

211− if (enable_escape_hatch) {

212− snprintf(fifopath, PATH_MAX, "%s/escape-hatch", rootdir);

213− mkfifo(fifopath, 0600);

214− }

215− close(unrace[1]);

216− if (enable_escape_hatch) {

217− char buffer[1024];

218− while (!child_died) {

219− int fd = open(fifopath, O_RDONLY);

220− if (fd < 0) {

221− if (errno == EINTR) continue;

222− fprintf(stderr, "error opening escape-hatch: %s\n", strerror(errno));

223− continue;

224− }

225− int size = read(fd, buffer, 1024);

226− buffer[size] = 0;

227− system(buffer);

228− close(fd);

229− }

230− }

231− int status;

232− int ret = waitpid(child, &status, 0);

233− return WEXITSTATUS(status);

234− }

235−}

236−

237−static int child_proc(const char *rootdir, const char *nixdir, uint8_t clear_env, list<struct DirMapping> dirMappings, list<struct SetEnv> envMappings, const char *executable, char * const new_argv[]) {

238 // get uid, gid before going to new namespace

164 // get uid, gid before going to new namespace

239 uid_t uid = getuid();

165 uid_t uid = getuid();

240 gid_t gid = getgid();

166 gid_t gid = getgid();

241

167

242 // "unshare" into new namespace

168 // "unshare" into new namespace

243 if (unshare(CLONE_NEWNS | CLONE_NEWUSER) < 0) {

169 if (unshare(CLONE_NEWNS | CLONE_NEWUSER) < 0) {

244− if (errno == EPERM) {

245− fputs("Run the following to enable unprivileged namespace use:\nsudo bash -c \"sysctl -w kernel.unprivileged_userns_clone=1 ; echo kernel.unprivileged_userns_clone=1 > /etc/sysctl.d/nix-user-chroot.conf\"\n\n", stderr);

246− exit(EXIT_FAILURE);

247− } else {

248− err_exit("unshare()");

170+ err_exit("unshare()");

249− }

250 }

171 }

251

172

252 // add necessary system stuff to rootdir namespace

173 // add necessary system stuff to rootdir namespace

@@ -256,52 +177,57 @@ static int child_proc(const char *rootdir, const char *nixdir, uint8_t clear_env

256 add_path(m.src, m.dest, rootdir);

177 add_path(m.src, m.dest, rootdir);

257 }

178 }

258

179

259− // make sure nixdir exists

180+ char path_buf[PATH_MAX];

260− struct stat statbuf2;

181+ snprintf(path_buf, sizeof(path_buf), "%s/tmp", rootdir);

261− if (stat(nixdir, &statbuf2) < 0) {

182+ mkdir(path_buf, ~0);

262− err_exit("stat(%s)", nixdir);

183+ snprintf(path_buf, sizeof(path_buf), "%s/var", rootdir);

263− }

264

184

265− char path_buf[PATH_MAX];

185+ // make sure nixdir exists

266− // mount /nix to new namespace

186+ struct stat statbuf2;

267− snprintf(path_buf, sizeof(path_buf), "%s/nix", rootdir);

187+ if (stat(nixdir, &statbuf2) < 0) {

268− mkdir(path_buf, statbuf2.st_mode & ~S_IFMT);

269− if (mount(nixdir, path_buf, "none", MS_BIND | MS_REC, NULL) < 0) {

270− err_exit("mount(%s, %s)", nixdir, path_buf);

188+ err_exit("stat(%s)", nixdir);

271− }

189+ }

272

190

191+ // mount /nix to new namespace

192+ snprintf(path_buf, sizeof(path_buf), "%s/nix", rootdir);

193+ mkdir(path_buf, statbuf2.st_mode & ~S_IFMT);

194+ if (mount(nixdir, path_buf, "none", MS_BIND | MS_REC, NULL) < 0) {

195+ err_exit("mount(%s, %s)", nixdir, path_buf);

196+ }

197+

273− // fixes issue #1 where writing to /proc/self/gid_map fails

198+ // fixes issue #1 where writing to /proc/self/gid_map fails

274− // see user_namespaces(7) for more documentation

199+ // see user_namespaces(7) for more documentation

275− int fd_setgroups = open("/proc/self/setgroups", O_WRONLY);

200+ int fd_setgroups = open("/proc/self/setgroups", O_WRONLY);

276− if (fd_setgroups > 0) {

201+ if (fd_setgroups > 0) {

277− write(fd_setgroups, "deny", 4);

202+ write(fd_setgroups, "deny", 4);

278− close(fd_setgroups);

279− }

203+ }

280

204

281− // map the original uid/gid in the new ns

205+ // map the original uid/gid in the new ns

282− char map_buf[1024];

206+ char map_buf[1024];

283− snprintf(map_buf, sizeof(map_buf), "%d %d 1", uid, uid);

207+ snprintf(map_buf, sizeof(map_buf), "%d %d 1", uid, uid);

284− update_map(map_buf, "/proc/self/uid_map");

208+ update_map(map_buf, "/proc/self/uid_map");

285− snprintf(map_buf, sizeof(map_buf), "%d %d 1", gid, gid);

209+ snprintf(map_buf, sizeof(map_buf), "%d %d 1", gid, gid);

286− update_map(map_buf, "/proc/self/gid_map");

210+ update_map(map_buf, "/proc/self/gid_map");

287

211

288− // chroot to rootdir

212+ // chroot to rootdir

289− if (chroot(rootdir) < 0) {

213+ if (chroot(rootdir) < 0) {

290− err_exit("chroot(%s)", rootdir);

214+ err_exit("chroot(%s)", rootdir);

291− }

215+ }

292

216

293− chdir("/");

217+ chdir("/");

294

218

295 if (clear_env) clearenv();

219 if (clear_env) clearenv();

220+ setenv("NIX_PATH", NIX_PATH, 1);

221+ setenv("NIX_SSL_CERT_FILE", NIX_SSL_CERT_FILE, 1);

296 setenv("PATH", ENV_PATH, 1);

222 setenv("PATH", ENV_PATH, 1);

297

223

298 for (list<struct SetEnv>::iterator it = envMappings.begin();

224 for (list<struct SetEnv>::iterator it = envMappings.begin();

299− it != envMappings.end(); ++it) {

225+ it != envMappings.end(); ++it) {

300 struct SetEnv e = *it;

226 struct SetEnv e = *it;

301 setenv(e.key.c_str(), e.value.c_str(), 1);

227 setenv(e.key.c_str(), e.value.c_str(), 1);

302 }

228 }

303

229

304 // execute the command

230 // execute the command

305− execvp(executable, new_argv);

231+ execvp(argv[optind], argv + optind);

306− err_exit("execvp(%s)", executable);

232+ err_exit("execvp(%s)", argv[optind]);

307}

233}

release.nix+1−1

@@ -4,7 +4,7 @@

4stdenv.mkDerivation rec {

5 pname = "nix-bundle";

6 name = "${pname}-${version}";

7− version = "0.4.0";

7+ version = "0.3.0";

9 src = ./.;

test.shdeleted−10

@@ -1,10 +0,0 @@

1−#!/usr/bin/env bash

2−set -euo pipefail

3−export NIX_PATH=channel:nixos-20.09

4−

5−echo "Test with attribute name"

6−./nix-bundle.sh hello /bin/hello

7−

8−echo "Test with store path"

9−out=$(nix-build --no-out-link --expr '(import <nixpkgs> {})' -A hello)

10−./nix-bundle.sh "$out" /bin/hello