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/*
* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
* All rights reserved.
*
* 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 HOLDER 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.
*/
#include <AK/JsonArray.h>
#include <AK/JsonObject.h>
#include <AK/JsonValue.h>
#include <AK/Optional.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
int parse_options(const StringView& options)
{
int flags = 0;
Vector<StringView> parts = options.split_view(',');
for (auto& part : parts) {
if (part == "defaults")
continue;
else if (part == "nodev")
flags |= MS_NODEV;
else if (part == "noexec")
flags |= MS_NOEXEC;
else if (part == "nosuid")
flags |= MS_NOSUID;
else if (part == "bind")
flags |= MS_BIND;
else if (part == "ro")
flags |= MS_RDONLY;
else if (part == "remount")
flags |= MS_REMOUNT;
else
fprintf(stderr, "Ignoring invalid option: %s\n", part.to_string().characters());
}
return flags;
}
bool is_source_none(const char* source)
{
return !strcmp("none", source);
}
int get_source_fd(const char* source)
{
if (is_source_none(source))
return -1;
int fd = open(source, O_RDWR);
if (fd < 0)
fd = open(source, O_RDONLY);
if (fd < 0) {
int saved_errno = errno;
auto message = String::format("Failed to open: %s\n", source);
errno = saved_errno;
perror(message.characters());
}
return fd;
}
bool mount_all()
{
// Mount all filesystems listed in /etc/fstab.
dbg() << "Mounting all filesystems...";
auto fstab = Core::File::construct("/etc/fstab");
if (!fstab->open(Core::IODevice::OpenMode::ReadOnly)) {
fprintf(stderr, "Failed to open /etc/fstab: %s\n", fstab->error_string());
return false;
}
bool all_ok = true;
while (fstab->can_read_line()) {
ByteBuffer buffer = fstab->read_line(1024);
StringView line_view = (const char*)buffer.data();
// Trim the trailing newline, if any.
if (line_view.length() > 0 && line_view[line_view.length() - 1] == '\n')
line_view = line_view.substring_view(0, line_view.length() - 1);
String line = line_view;
// Skip comments and blank lines.
if (line.is_empty() || line.starts_with("#"))
continue;
Vector<String> parts = line.split('\t');
if (parts.size() < 3) {
fprintf(stderr, "Invalid fstab entry: %s\n", line.characters());
all_ok = false;
continue;
}
const char* mountpoint = parts[1].characters();
const char* fstype = parts[2].characters();
int flags = parts.size() >= 4 ? parse_options(parts[3]) : 0;
if (strcmp(mountpoint, "/") == 0) {
dbg() << "Skipping mounting root";
continue;
}
const char* filename = parts[0].characters();
int fd = get_source_fd(filename);
dbg() << "Mounting " << filename << "(" << fstype << ")"
<< " on " << mountpoint;
int rc = mount(fd, mountpoint, fstype, flags);
if (rc != 0) {
fprintf(stderr, "Failed to mount %s (FD: %d) (%s) on %s: %s\n", filename, fd, fstype, mountpoint, strerror(errno));
all_ok = false;
continue;
}
}
return all_ok;
}
bool print_mounts()
{
// Output info about currently mounted filesystems.
auto df = Core::File::construct("/proc/df");
if (!df->open(Core::IODevice::ReadOnly)) {
fprintf(stderr, "Failed to open /proc/df: %s\n", df->error_string());
return false;
}
auto content = df->read_all();
auto json = JsonValue::from_string(content);
ASSERT(json.has_value());
json.value().as_array().for_each([](auto& value) {
auto fs_object = value.as_object();
auto class_name = fs_object.get("class_name").to_string();
auto mount_point = fs_object.get("mount_point").to_string();
auto source = fs_object.get("source").as_string_or("none");
auto readonly = fs_object.get("readonly").to_bool();
auto mount_flags = fs_object.get("mount_flags").to_int();
printf("%s on %s type %s (", source.characters(), mount_point.characters(), class_name.characters());
if (readonly || mount_flags & MS_RDONLY)
printf("ro");
else
printf("rw");
if (mount_flags & MS_NODEV)
printf(",nodev");
if (mount_flags & MS_NOEXEC)
printf(",noexec");
if (mount_flags & MS_NOSUID)
printf(",nosuid");
if (mount_flags & MS_BIND)
printf(",bind");
printf(")\n");
});
return true;
}
int main(int argc, char** argv)
{
const char* source = nullptr;
const char* mountpoint = nullptr;
const char* fs_type = nullptr;
const char* options = nullptr;
bool should_mount_all = false;
Core::ArgsParser args_parser;
args_parser.add_positional_argument(source, "Source path", "source", Core::ArgsParser::Required::No);
args_parser.add_positional_argument(mountpoint, "Mount point", "mountpoint", Core::ArgsParser::Required::No);
args_parser.add_option(fs_type, "File system type", nullptr, 't', "fstype");
args_parser.add_option(options, "Mount options", nullptr, 'o', "options");
args_parser.add_option(should_mount_all, "Mount all file systems listed in /etc/fstab", nullptr, 'a');
args_parser.parse(argc, argv);
if (should_mount_all) {
return mount_all() ? 0 : 1;
}
if (!source && !mountpoint)
return print_mounts() ? 0 : 1;
if (source && mountpoint) {
if (!fs_type)
fs_type = "ext2";
int flags = options ? parse_options(options) : 0;
int fd = get_source_fd(source);
if (mount(fd, mountpoint, fs_type, flags) < 0) {
perror("mount");
return 1;
}
return 0;
}
args_parser.print_usage(stderr, argv[0]);
return 1;
}
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