mirror of
https://github.com/RGBCube/serenity
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3847d00727
This makes it possible to change flags of a mount after the fact, with the caveats outlined in the man page.
88 lines
3.1 KiB
C++
88 lines
3.1 KiB
C++
/*
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* Copyright (c) 2020, Sergey Bugaev <bugaevc@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/StringView.h>
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#include <LibCore/ArgsParser.h>
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#include <stdio.h>
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#include <unistd.h>
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int main(int argc, char** argv)
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{
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const char* path = nullptr;
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const char* program = "/bin/Shell";
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int flags = -1;
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Core::ArgsParser args_parser;
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args_parser.add_positional_argument(path, "New root directory", "path");
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args_parser.add_positional_argument(program, "Program to run", "program", Core::ArgsParser::Required::No);
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Core::ArgsParser::Option option {
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true,
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"Mount options",
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"options",
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'o',
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"options",
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[&flags](const char* s) {
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flags = 0;
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Vector<StringView> parts = StringView(s).split_view(',');
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for (auto& part : parts) {
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if (part == "defaults")
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continue;
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else if (part == "nodev")
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flags |= MS_NODEV;
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else if (part == "noexec")
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flags |= MS_NOEXEC;
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else if (part == "nosuid")
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flags |= MS_NOSUID;
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else if (part == "ro")
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flags |= MS_RDONLY;
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else if (part == "remount")
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flags |= MS_REMOUNT;
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else if (part == "bind")
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fprintf(stderr, "Ignoring -o bind, as it doesn't make sense for chroot\n");
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else
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return false;
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}
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return true;
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}
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};
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args_parser.add_option(move(option));
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args_parser.parse(argc, argv);
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if (chroot_with_mount_flags(path, flags) < 0) {
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perror("chroot");
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return 1;
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}
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if (chdir("/") < 0) {
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perror("chdir(/)");
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return 1;
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}
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execl(program, program, nullptr);
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perror("execl");
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return 1;
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}
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