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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 <LibCore/CArgsParser.h>
#include <LibCore/CFile.h>
#include <stdio.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
fprintf(stderr, "Ignoring invalid option: %s\n", String(part).characters());
}
return flags;
}
bool mount_all()
{
// Mount all filesystems listed in /etc/fstab.
dbg() << "Mounting all filesystems...";
auto fstab = CFile::construct("/etc/fstab");
if (!fstab->open(CIODevice::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* devname = parts[0].characters();
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;
}
dbg() << "Mounting " << devname << "(" << fstype << ")"
<< " on " << mountpoint;
int rc = mount(devname, mountpoint, fstype, flags);
if (rc != 0) {
fprintf(stderr, "Failed to mount %s (%s) on %s: %s\n", devname, fstype, mountpoint, strerror(errno));
all_ok = false;
continue;
}
}
return all_ok;
}
bool print_mounts()
{
// Output info about currently mounted filesystems.
auto df = CFile::construct("/proc/df");
if (!df->open(CIODevice::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).as_array();
json.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 device = fs_object.get("device").as_string_or(class_name);
auto readonly = fs_object.get("readonly").to_bool();
auto mount_flags = fs_object.get("mount_flags").to_int();
printf("%s on %s type %s (", device.characters(), mount_point.characters(), class_name.characters());
if (readonly)
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)
{
CArgsParser args_parser("mount");
args_parser.add_arg("devname", "device path");
args_parser.add_arg("mountpoint", "mount point");
args_parser.add_arg("t", "fstype", "file system type");
args_parser.add_arg("o", "options", "mount options");
args_parser.add_arg("a", "mount all systems listed in /etc/fstab");
CArgsParserResult args = args_parser.parse(argc, argv);
if (args.is_present("a")) {
return mount_all() ? 0 : 1;
}
switch (args.get_single_values().size()) {
case 0:
return print_mounts() ? 0 : 1;
case 2: {
String devname = args.get_single_values()[0];
String mountpoint = args.get_single_values()[1];
String fstype = args.is_present("t") ? args.get("t") : "ext2";
int flags = args.is_present("o") ? parse_options(args.get("o")) : 0;
if (mount(devname.characters(), mountpoint.characters(), fstype.characters(), flags) < 0) {
perror("mount");
return 1;
}
return 0;
}
default:
args_parser.print_usage();
return 1;
}
}
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