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jinx
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jinx
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#! /bin/sh
# Copyright (C) 2022-2023, mintsuki
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
set -e
jinx_version="0.0.40"
IFS=" "" "'
'
LC_COLLATE=C
export LC_COLLATE
parallelism="$(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || psrinfo -tc 2>/dev/null || echo 1)"
build_dir="$(pwd -P)"
if [ -z "$JINX_SOURCE_DIR" ]; then
base_dir="$build_dir"
else
base_dir="$(cd "$JINX_SOURCE_DIR" && pwd -P)"
fi
script_name="$(basename "$0")"
script_dir="$(dirname "$0")"
if [ "$script_dir" = "." ] || [ -z "$script_dir" ]; then
if echo "$0" | grep "/" >/dev/null 2>&1; then
script_dir=.
else
script_dir="$(dirname $(which "${script_name}"))"
fi
fi
script_dir="$(cd "${script_dir}" && pwd -P)"
script="${script_dir}/${script_name}"
if [ -z "$JINX_CONFIG_FILE" ]; then
JINX_CONFIG_FILE_PATH="${base_dir}"/jinx-config
else
JINX_CONFIG_FILE_PATH="${base_dir}"/"${JINX_CONFIG_FILE}"
fi
if [ -z "$JINX_CACHE_DIR" ]; then
JINX_CACHE_DIR="$build_dir/.jinx-cache"
fi
pacman_cache="$JINX_CACHE_DIR/pacman"
die() {
echo "$1"
exit 1
}
temp_collect=""
trap 'rm -rf $temp_collect; trap - EXIT; exit' EXIT INT TERM QUIT HUP
make_temp() {
tmp="$(mktemp $1 "$JINX_CACHE_DIR/tmp.XXXXXXXX")"
temp_collect="${temp_collect} ${tmp}"
}
build_hostdeps() {
for hostdep in ${hostdeps} ${hostrundeps}; do
[ -f "${base_dir}"/host-recipes/${hostdep} ] || die "missing host dependency '${hostdep}' for recipe '${name}'"
[ -f "${build_dir}"/host-builds/${hostdep}.installed ] && continue
"${script}" host-build ${hostdep}
done
}
build_deps() {
for dep in ${deps} ${builddeps}; do
[ -f "${base_dir}"/recipes/${dep} ] || die "missing dependency '${dep}' for recipe '${name}'"
[ -f "${build_dir}"/builds/${dep}.installed ] && continue
"${script}" build ${dep}
done
}
get_hostdeps_file_run() {
deps_to_do=""
for hostdep in ${hostrundeps}; do
grep "${hostdep} " "${hostdeps_file}" >/dev/null 2>&1 || deps_to_do="${deps_to_do} ${hostdep}"
grep "${hostdep} " "${hostdeps_file}" >/dev/null 2>&1 || printf "${hostdep} " >> "${hostdeps_file}"
done
for hostdep in ${deps_to_do}; do
"${script}" internal-get-hostdeps-file-run ${hostdep} "${hostdeps_file}"
done
}
get_hostdeps_file() {
deps_to_do=""
for hostdep in ${hostdeps} ${hostrundeps}; do
grep "${hostdep} " "${hostdeps_file}" >/dev/null 2>&1 || deps_to_do="${deps_to_do} ${hostdep}"
grep "${hostdep} " "${hostdeps_file}" >/dev/null 2>&1 || printf "${hostdep} " >> "${hostdeps_file}"
done
for hostdep in ${deps_to_do}; do
"${script}" internal-get-hostdeps-file-run ${hostdep} "${hostdeps_file}"
done
}
get_builddeps_file() {
deps_to_do=""
for dep in ${deps} ${builddeps}; do
grep "${dep} " "${deps_file}" >/dev/null 2>&1 || deps_to_do="${deps_to_do} ${dep}"
grep "${dep} " "${deps_file}" >/dev/null 2>&1 || printf "${dep} " >> "${deps_file}"
done
for dep in ${deps_to_do}; do
"${script}" internal-get-deps-file ${dep} "${deps_file}"
done
}
get_deps_file() {
deps_to_do=""
for dep in ${deps}; do
grep "${dep} " "${deps_file}" >/dev/null 2>&1 || deps_to_do="${deps_to_do} ${dep}"
grep "${dep} " "${deps_file}" >/dev/null 2>&1 || printf "${dep} " >> "${deps_file}"
done
for dep in ${deps_to_do}; do
"${script}" internal-get-deps-file ${dep} "${deps_file}"
done
}
run_in_container1() {
if ! [ -z "$TERM" ]; then
run_in_cont1_term="--env TERM=\"$TERM\""
fi
if ! [ -z "$COLORTERM" ]; then
run_in_cont1_colorterm="--env COLORTERM=\"$COLORTERM\""
fi
run_in_cont1_root="$1"
shift 1
"$JINX_CACHE_DIR/rbrt" \
--root "$run_in_cont1_root" rw \
--uid 0 \
--gid 0 \
--env HOME=/root \
--env LANG=en_US.UTF-8 \
--env LC_COLLATE=C \
--env PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl \
${run_in_cont1_term} \
${run_in_cont1_colorterm} \
--mount "${pacman_cache}":/var/cache/pacman/pkg \
-- \
"$@"
}
prepare_container() {
cd "${build_dir}"
make_temp
hostdeps_file="${tmp}"
make_temp
deps_file="${tmp}"
build_hostdeps
build_deps
get_hostdeps_file
get_builddeps_file
make_temp -d
container_pkgs="${tmp}"
make_temp -d
sysroot_dir="${tmp}"
for hostdep in $(cat "${hostdeps_file}"); do
cp -Plrf "${build_dir}"/host-pkgs/${hostdep}/usr/local/. "${container_pkgs}"/
done
for dep in $(cat "${deps_file}"); do
cp -Plrf "${build_dir}"/pkgs/${dep}/. "${sysroot_dir}"/
done
imagedeps="$(echo "${imagedeps}" | xargs -n1 | sort -u | xargs)"
while true; do
fail_check=""
pkgset=""
for pkg in ${imagedeps}; do
pkgset="${pkgset}${pkg}/"
if [ -d "$JINX_CACHE_DIR/sets/${pkgset}.image" ]; then
continue
fi
mkdir -p "$JINX_CACHE_DIR/sets/${pkgset}"
cp -Plrf "$JINX_CACHE_DIR/sets/${pkgset}../.image" "$JINX_CACHE_DIR/sets/${pkgset}.image"
make_temp
pacman_log="${tmp}"
tail -f "${pacman_log}" &
tail_pid=$!
if ! run_in_container1 "$JINX_CACHE_DIR/sets/${pkgset}.image" pacman --needed --noconfirm -S "${pkg}" >"${pacman_log}" 2>&1; then
kill "${tail_pid}"
if grep "target not found" "${pacman_log}" >/dev/null 2>&1; then
rm -f "${pacman_log}"
chmod -R 777 "$JINX_CACHE_DIR/sets/${pkgset}"
rm -rf "$JINX_CACHE_DIR/sets/${pkgset}"
die
fi
rm -f "${pacman_log}"
reinit_container
fail_check=on
break
fi
kill "${tail_pid}"
rm -f "${pacman_log}"
# Fix permissions of files
for f in $(find "$JINX_CACHE_DIR/sets/${pkgset}.image" -perm 000 2>/dev/null); do
chmod 755 "$f"
done
done
[ "$fail_check" = "on" ] || break
done
imgroot="$JINX_CACHE_DIR/sets/${pkgset}.image"
}
run_in_container() {
if [ "${allow_network}" = "yes" ]; then
unshare_net_flag=""
else
unshare_net_flag="-n"
fi
if [ ! -z "$TERM" ]; then
run_in_cont_term="--env TERM=\"$TERM\""
fi
if ! [ -z "$COLORTERM" ]; then
run_in_cont_colorterm="--env COLORTERM=\"$COLORTERM\""
fi
"$JINX_CACHE_DIR/rbrt" \
--root "${imgroot}" \
--uid $(id -u) \
--gid $(id -g) \
--env HOME=/home/$(whoami) \
--env LANG=en_US.UTF-8 \
--env LC_COLLATE=C \
--env PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl \
${run_in_cont_term} \
${run_in_cont_colorterm} \
--env JINX_CONFIG_FILE="$JINX_CONFIG_FILE" \
--env JINX_SOURCE_DIR=/base_dir \
--mount "${container_pkgs}":/usr/local:ro \
--mount "${sysroot_dir}":/sysroot:ro \
--mount "${script}":/jinx:ro \
--mount "${base_dir}":/base_dir${container_base_dir_ro} \
--mount "${base_dir}"/sources:/base_dir/sources${container_sources_ro} \
--mount "${build_dir}":/build_dir \
${unshare_net_flag} \
--workdir /build_dir \
-- \
/jinx "$@"
}
destroy_container() {
rm -rf "${container_pkgs}" "${sysroot_dir}"
}
do_fetch() {
mkdir -p "${base_dir}"/sources
[ -d "${source_dir}" ] && return
make_temp -d
extract_dir="${tmp}"
tarball_path="${base_dir}"/sources/"$(basename "${tarball_url}")"
curl -L -o "${tarball_path}" "${tarball_url}"
checksum_verified=no
if ! [ -z "${tarball_sha256}" ]; then
if ! sha256sum "${tarball_path}" | grep "${tarball_sha256}" >/dev/null 2>&1; then
die "* error: Failed to verify SHA256 for ${name}!"
fi
checksum_verified=yes
fi
if ! [ -z "${tarball_sha512}" ]; then
if ! sha512sum "${tarball_path}" | grep "${tarball_sha512}" >/dev/null 2>&1; then
die "* error: Failed to verify SHA512 for ${name}!"
fi
checksum_verified=yes
fi
if ! [ -z "${tarball_blake2b}" ]; then
if ! b2sum "${tarball_path}" | grep "${tarball_blake2b}" >/dev/null 2>&1; then
die "* error: Failed to verify BLAKE2B for ${name}!"
fi
checksum_verified=yes
fi
if [ "${checksum_verified}" = "no" ]; then
die "* error: No checksum method specified for ${name}"
fi
( cd "${extract_dir}" && tar -xf "${tarball_path}" )
mv "${extract_dir}"/* "${base_dir}"/sources/${name} >/dev/null 2>&1 || (
mkdir -p "${base_dir}"/sources/${name}
mv "${extract_dir}"/* "${base_dir}"/sources/${name}/
)
rm -rf "${extract_dir}" "${tarball_path}"
}
get_real_source_dir() {
if [ -z "${source_dir}" ]; then
source_dir="${base_dir}"/sources/${name}
else
source_dir="${base_dir}"/"${source_dir}"
is_local_package=true
fi
}
cont_patch() {
. "${base_dir}"/source-recipes/$1
get_real_source_dir
patch_trash="/tmp/patch_trash"
mkdir -p "$patch_trash"
cd "${source_dir}"
if [ -d "${base_dir}"/patches/${name} ]; then
for patch in "${base_dir}"/patches/${name}/*; do
[ "${patch}" = "${base_dir}/patches/${name}/*" ] && break
[ "${patch}" = "${base_dir}"/patches/${name}/jinx-working-patch.patch ] && continue
patch --no-backup-if-mismatch -p1 -r "${patch_trash}" < "${patch}"
done
fi
cp -r "${source_dir}" "${base_dir}"/sources/${name}-clean
if [ -f "${base_dir}"/patches/${name}/jinx-working-patch.patch ]; then
patch --no-backup-if-mismatch -p1 -r "${patch_trash}" < "${base_dir}"/patches/${name}/jinx-working-patch.patch
fi
cp -r "${source_dir}" "${base_dir}"/sources/${name}-workdir
cd "${base_dir}"
touch "${base_dir}"/sources/${name}.patched
}
do_regenerate() {
. "${base_dir}"/source-recipes/$1
get_real_source_dir
[ -f "${base_dir}"/sources/${name}.regenerated ] && return
[ -f "${JINX_CONFIG_FILE_PATH}" ] && . "${JINX_CONFIG_FILE_PATH}"
cd "${source_dir}"
[ "${is_local_package}" = true ] || container_base_dir_ro=":ro"
regenerate
container_base_dir_ro=""
cd "${base_dir}"
touch "${base_dir}"/sources/${name}.regenerated
}
do_configure_host() {
. "${base_dir}"/host-recipes/$1
[ -f "${build_dir}"/host-builds/${name}.configured ] && return
mkdir -p "${build_dir}"/host-builds/${name}
eval $(grep 'source_dir=' < "${base_dir}"/source-recipes/${from_source})
if [ -z "${source_dir}" ]; then
source_dir="${base_dir}"/sources/${from_source}
else
source_dir="${base_dir}"/"${source_dir}"
fi
prefix="/usr/local"
sysroot_dir="/sysroot"
[ -f "${JINX_CONFIG_FILE_PATH}" ] && . "${JINX_CONFIG_FILE_PATH}"
cd "${build_dir}"/host-builds/${name}
configure
cd "${base_dir}"
touch "${build_dir}"/host-builds/${name}.configured
}
do_build_host() {
. "${base_dir}"/host-recipes/$1
[ -f "${build_dir}"/host-builds/${name}.built ] && return
eval $(grep 'source_dir=' < "${base_dir}"/source-recipes/${from_source})
if [ -z "${source_dir}" ]; then
source_dir="${base_dir}"/sources/${from_source}
else
source_dir="${base_dir}"/"${source_dir}"
fi
prefix="/usr/local"
sysroot_dir="/sysroot"
[ -f "${JINX_CONFIG_FILE_PATH}" ] && . "${JINX_CONFIG_FILE_PATH}"
cd "${build_dir}"/host-builds/${name}
build
cd "${base_dir}"
touch "${build_dir}"/host-builds/${name}.built
}
do_install_host() {
. "${base_dir}"/host-recipes/$1
[ -f "${build_dir}"/host-builds/${name}.installed ] && return
dest_dir="${build_dir}"/host-pkgs/${name}
rm -rf "${dest_dir}"
mkdir -p "${dest_dir}"
eval $(grep 'source_dir=' < "${base_dir}"/source-recipes/${from_source})
if [ -z "${source_dir}" ]; then
source_dir="${base_dir}"/sources/${from_source}
else
source_dir="${base_dir}"/"${source_dir}"
fi
prefix="/usr/local"
sysroot_dir="/sysroot"
mkdir -p "${dest_dir}${prefix}"
[ -f "${JINX_CONFIG_FILE_PATH}" ] && . "${JINX_CONFIG_FILE_PATH}"
cd "${build_dir}"/host-builds/${name}
install
cd "${base_dir}"
# Remove libtool files
for i in $(find "${dest_dir}${prefix}" -name "*.la"); do
rm -rvf $i
done
touch "${build_dir}"/host-builds/${name}.installed
}
do_configure() {
. "${base_dir}"/recipes/$1
[ -f "${build_dir}"/builds/${name}.configured ] && return
mkdir -p "${build_dir}"/builds/${name}
eval $(grep 'source_dir=' < "${base_dir}"/source-recipes/${from_source})
if [ -z "${source_dir}" ]; then
source_dir="${base_dir}"/sources/${from_source}
else
source_dir="${base_dir}"/"${source_dir}"
fi
prefix="/usr"
sysroot_dir="/sysroot"
[ -f "${JINX_CONFIG_FILE_PATH}" ] && . "${JINX_CONFIG_FILE_PATH}"
cd "${build_dir}"/builds/${name}
configure
cd "${base_dir}"
touch "${build_dir}"/builds/${name}.configured
}
do_build() {
. "${base_dir}"/recipes/$1
[ -f "${build_dir}"/builds/${name}.built ] && return
eval $(grep 'source_dir=' < "${base_dir}"/source-recipes/${from_source})
if [ -z "${source_dir}" ]; then
source_dir="${base_dir}"/sources/${from_source}
else
source_dir="${base_dir}"/"${source_dir}"
fi
prefix="/usr"
sysroot_dir="/sysroot"
[ -f "${JINX_CONFIG_FILE_PATH}" ] && . "${JINX_CONFIG_FILE_PATH}"
cd "${build_dir}"/builds/${name}
build
cd "${base_dir}"
touch "${build_dir}"/builds/${name}.built
}
do_install() {
. "${base_dir}"/recipes/$1
[ -f "${build_dir}"/builds/${name}.installed ] && return
dest_dir="${build_dir}"/pkgs/${name}
rm -rf "${dest_dir}"
mkdir -p "${dest_dir}"
eval $(grep 'source_dir=' < "${base_dir}"/source-recipes/${from_source})
if [ -z "${source_dir}" ]; then
source_dir="${base_dir}"/sources/${from_source}
else
source_dir="${base_dir}"/"${source_dir}"
fi
prefix="/usr"
sysroot_dir="/sysroot"
mkdir -p "${dest_dir}${prefix}"
[ -f "${JINX_CONFIG_FILE_PATH}" ] && . "${JINX_CONFIG_FILE_PATH}"
cd "${build_dir}"/builds/${name}
install
cd "${base_dir}"
# Remove libtool files
for i in $(find "${dest_dir}${prefix}" -name "*.la"); do
rm -rvf $i
done
touch "${build_dir}"/builds/${name}.installed
}
precont_patch() {
[ -f "${base_dir}"/sources/$1.patched ] && return
prepare_container
run_in_container internal-cont-patch $1
destroy_container
}
do_source() {
. "${base_dir}"/source-recipes/$1
get_real_source_dir
do_fetch
"${script}" internal-precont-patch $1
prepare_container
run_in_container internal-regenerate $1
destroy_container
}
do_cmd_rebuild() {
rm -rf "${build_dir}"/builds/"$1"
rm -rf "${build_dir}"/builds/"$1".*
rm -rf "${build_dir}"/pkgs/"$1"
rm -rf "${build_dir}"/pkgs/"$1".*
do_pkg "$1"
}
do_cmd_host_rebuild() {
rm -rf "${build_dir}"/host-builds/"$1"
rm -rf "${build_dir}"/host-builds/"$1".*
rm -rf "${build_dir}"/host-pkgs/"$1"
rm -rf "${build_dir}"/host-pkgs/"$1".*
do_host_pkg "$1"
}
do_cmd_regenerate() {
. "${base_dir}"/source-recipes/$1
[ -f "${base_dir}"/sources/$1.patched ] || die "cannot regenerate non-built package"
get_real_source_dir
make_temp
patch_file="${tmp}"
if ! [ "${is_local_package}" = true ]; then
cd "${base_dir}"/sources
git diff --no-index --no-prefix $1-clean $1-workdir >"${patch_file}" || true
if [ -s "${patch_file}" ]; then
mkdir -p "${base_dir}"/patches/$1
mv "${patch_file}" "${base_dir}"/patches/$1/jinx-working-patch.patch
fi
cd "${base_dir}"
rm -rf "${source_dir}"
cp -r "${base_dir}"/sources/$1-workdir "${source_dir}"
fi
rm -rf "${base_dir}"/sources/$1.regenerated
prepare_container
run_in_container internal-regenerate $1
destroy_container
}
do_host_pkg() {
. "${base_dir}"/host-recipes/$1
[ -f "${build_dir}"/host-builds/${name}.installed ] && return
echo "* building host package: $name"
eval $(grep 'from_source=' < "${base_dir}"/host-recipes/$1)
[ -f "${base_dir}"/sources/${from_source}.regenerated ] || \
"${script}" internal-source "${from_source}"
prepare_container
container_sources_ro=":ro"
run_in_container internal-configure-host $1
run_in_container internal-build-host $1
run_in_container internal-install-host $1
unset container_sources_ro
destroy_container
}
do_pkg() {
. "${base_dir}"/recipes/$1
[ -f "${build_dir}"/builds/${name}.installed ] && return
echo "* building package: $name"
eval $(grep 'from_source=' < "${base_dir}"/recipes/$1)
[ -f "${base_dir}"/sources/${from_source}.regenerated ] || \
"${script}" internal-source "${from_source}"
prepare_container
container_sources_ro=":ro"
run_in_container internal-configure $1
run_in_container internal-build $1
run_in_container internal-install $1
unset container_sources_ro
destroy_container
}
cmd_build_all() {
for pkg in "${base_dir}"/recipes/*; do
"${script}" internal-do-pkg $(basename "${pkg}")
done
}
cmd_host_build() {
for i in "$@"; do
"${script}" internal-do-host-pkg "$i"
done
}
cmd_build() {
for i in "$@"; do
"${script}" internal-do-pkg "$i"
done
}
cmd_regenerate() {
for i in "$@"; do
"${script}" internal-do-regenerate "$i"
done
}
cmd_host_rebuild() {
for i in "$@"; do
"${script}" internal-do-host-rebuild "$i"
done
}
cmd_rebuild() {
for i in "$@"; do
"${script}" internal-do-rebuild "$i"
done
}
cmd_clean() {
rm -rf "${build_dir}"/builds
rm -rf "${build_dir}"/host-builds
rm -rf "${build_dir}"/pkgs
rm -rf "${build_dir}"/host-pkgs
rm -rf "${base_dir}"/sources
rm -rf "${build_dir}"/sysroot
}
cmd_install() {
sysroot="$1"
shift 1
mkdir -p "${sysroot}"
for ppkg in "$@"; do
if [ "${ppkg}" = '*' ]; then
for pkg in "${build_dir}"/pkgs/*; do
add_to_sysroot=""
eval $(grep 'add_to_sysroot=' < "${base_dir}"/recipes/$(basename ${pkg}))
if [ "${add_to_sysroot}" = "no" ]; then
continue
fi
echo "* copying $(basename ${pkg}) to sysroot '${sysroot}'..."
cp -rf "${pkg}"/. "${sysroot}"/
done
return
fi
for pkg in $(eval echo pkgs/"${ppkg}"); do
deps="${deps} $(basename "${pkg}")"
done
done
make_temp
deps_file="${tmp}"
echo "* resolving dependencies..."
get_deps_file
for pkg in $(cat "${deps_file}"); do
echo "* installing ${pkg} to sysroot '${sysroot}'..."
cp -rf pkgs/"${pkg}"/. "${sysroot}"/
done
}
rebuild_rbrt() {
cat <<'EOF' >"$JINX_CACHE_DIR/rbrt.c"
// Written by czapek1337 ([email protected])
// Inspired heavily by https:/managarm/cbuildrt/
#define _GNU_SOURCE
#include <stddef.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sched.h>
#include <sys/mount.h>
#include <sys/wait.h>
#define STRINGIFY(x) #x
#define TOSTRING(x) STRINGIFY(x)
int main(int argc, char *argv[]) {
int ok = 1;
const char *err_msg = "";
char *rootfs = NULL;
char **mounts = NULL;
char **envs = NULL;
char **process_args = NULL;
int mount_count = 0;
int mounts_size = 0;
int env_count = 0;
int envs_size = 0;
bool rw_root = false;
bool unshare_net = false;
int uid = -1, gid = -1;
int euid = geteuid();
int egid = getegid();
int setgroups_fd = -1;
int uid_map_fd = -1;
int gid_map_fd = -1;
char *workdir = "/";
for (int i = 1; i < argc; ) {
if (strcmp(argv[i], "--workdir") == 0) {
workdir = argv[i + 1];
i += 2;
} else if (strcmp(argv[i], "-r") == 0 || strcmp(argv[i], "--root") == 0) {
if (i == argc - 1) {
fprintf(stderr, "%s: '%s' requires a value\n", argv[0], argv[i]);
goto cleanup;
}
rootfs = argv[i + 1];
i += 2;
if (i < argc - 1 && strcmp(argv[i], "rw") == 0) {
rw_root = true;
i++;
}
} else if (strcmp(argv[i], "-u") == 0 || strcmp(argv[i], "--uid") == 0) {
if (i == argc - 1) {
fprintf(stderr, "%s: '%s' requires a value\n", argv[0], argv[i]);
goto cleanup;
}
if (sscanf(argv[i + 1], "%d", &uid) != 1) {
fprintf(stderr, "%s: '%s' is not a valid user ID\n", argv[0], argv[i + 1]);
goto cleanup;
}
i += 2;
} else if (strcmp(argv[i], "-g") == 0 || strcmp(argv[i], "--gid") == 0) {
if (i == argc - 1) {
fprintf(stderr, "%s: '%s' requires a value\n", argv[0], argv[i]);
goto cleanup;
}
if (sscanf(argv[i + 1], "%d", &gid) != 1) {
fprintf(stderr, "%s: '%s' is not a valid group ID\n", argv[0], argv[i + 1]);
goto cleanup;
}
i += 2;
} else if (strcmp(argv[i], "-m") == 0 || strcmp(argv[i], "--mount") == 0) {
if (i == argc - 1) {
fprintf(stderr, "%s: '%s' requires a value\n", argv[0], argv[i]);
goto cleanup;
}
if (mount_count == mounts_size) {
mounts_size = mounts_size == 0 ? 16 : mounts_size * 2;
char **tmp_mounts = realloc(mounts, sizeof(char *) * mounts_size);
if (tmp_mounts == NULL) {
fprintf(stderr, "%s: failed to allocate mounts array\n", argv[0]);
goto cleanup;
}
mounts = tmp_mounts;
}
char *target = argv[i + 1];
while (*target && *target != ':') {
target++;
}
if (!*target) {
fprintf(stderr, "%s: mount points need to be provided in the 'source:target' format\n", argv[0]);
goto cleanup;
}
mounts[mount_count++] = argv[i + 1];
i += 2;
} else if (strcmp(argv[i], "-e") == 0 || strcmp(argv[i], "--env") == 0) {
if (i == argc - 1) {
fprintf(stderr, "%s: '%s' requires a value\n", argv[0], argv[i]);
goto cleanup;
}
if (env_count == envs_size) {
envs_size = envs_size == 0 ? 16 : envs_size * 2;
char **tmp_envs = realloc(envs, sizeof(char *) * envs_size);
if (tmp_envs == NULL) {
fprintf(stderr, "%s: failed to allocate environment variables array\n", argv[0]);
goto cleanup;
}
envs = tmp_envs;
}
char *value = argv[i + 1];
while (*value && *value != '=') {
value++;
}
if (!*value) {
fprintf(stderr, "%s: environment variables need to be provided in the 'key=value' format\n", argv[0]);
goto cleanup;
}
envs[env_count++] = argv[i + 1];
i += 2;
} else if (strcmp(argv[i], "-n") == 0 || strcmp(argv[i], "--net") == 0) {
unshare_net = true;
i += 1;
} else if (strcmp(argv[i], "--") == 0) {
if (i == argc - 1) {
fprintf(stderr, "%s: at least one trailing argument is required\n", argv[0]);
goto cleanup;
}
process_args = &argv[i + 1];
break;
} else {
fprintf(stderr, "%s: unrecognized option '%s'\n", argv[0], argv[i]);
goto cleanup;
}
}
if (rootfs == NULL) {
fprintf(stderr, "%s: root file system path is required\n", argv[0]);
goto cleanup;
}
if (process_args == NULL) {
fprintf(stderr, "%s: process arguments are requires\n", argv[0]);
goto cleanup;
}
if (uid == -1 || gid == -1) {
fprintf(stderr, "%s: user and group IDs are both required\n", argv[0]);
goto cleanup;
}
if (unshare(CLONE_NEWUSER | CLONE_NEWPID) < 0) {
err_msg = "unshare() failure at line " TOSTRING(__LINE__);
goto errno_error;
}
char uid_map[64], gid_map[64];
int uid_map_len = snprintf(uid_map, 64, "%d %d 1", uid, euid);
int gid_map_len = snprintf(gid_map, 64, "%d %d 1", gid, egid);
setgroups_fd = open("/proc/self/setgroups", O_RDWR);
if (setgroups_fd < 0 || write(setgroups_fd, "deny", 4) < 0) {
err_msg = "failed to open or write to /proc/self/setgroups at line " TOSTRING(__LINE__);
goto errno_error;
}
close(setgroups_fd);
setgroups_fd = -1;
uid_map_fd = open("/proc/self/uid_map", O_RDWR);
if (uid_map_fd < 0 || write(uid_map_fd, uid_map, uid_map_len) < 0) {
err_msg = "failed to open or write to /proc/self/uid_map at line " TOSTRING(__LINE__);
goto errno_error;
}
close(uid_map_fd);
uid_map_fd = -1;
gid_map_fd = open("/proc/self/gid_map", O_RDWR);
if (gid_map_fd < 0 || write(gid_map_fd, gid_map, gid_map_len) < 0) {
err_msg = "failed to open or write to /proc/self/gid_map at line " TOSTRING(__LINE__);
goto errno_error;
}
close(gid_map_fd);
gid_map_fd = -1;
if (setuid(uid) < 0 || setgid(gid) < 0) {
err_msg = "setuid()/setgid() failure at line " TOSTRING(__LINE__);
goto errno_error;
}
int child_pid = fork();
if (child_pid == 0) {
if (unshare(CLONE_NEWNS) < 0) {
err_msg = "unshare() failure at line " TOSTRING(__LINE__);
goto errno_error;
}