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// Copyright 2021 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "test/util/mount_util.h"
#include <sys/syscall.h>
#include <unistd.h>
#include "absl/strings/numbers.h"
#include "absl/strings/str_split.h"
namespace gvisor {
namespace testing {
PosixErrorOr<std::vector<ProcMountsEntry>> ProcSelfMountsEntries() {
std::string content;
RETURN_IF_ERRNO(GetContents("/proc/self/mounts", &content));
std::vector<ProcMountsEntry> entries;
std::vector<std::string> lines = absl::StrSplit(content, '\n');
std::cerr << "<contents of /proc/self/mounts>" << std::endl;
for (const std::string& line : lines) {
std::cerr << line << std::endl;
if (line.empty()) {
continue;
}
// Parse a single entry from /proc/self/mounts.
//
// Example entries:
//
// sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
// proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
// ^ ^ ^ ^ ^ ^
// 0 1 2 3 4 5
ProcMountsEntry entry;
std::vector<std::string> fields =
absl::StrSplit(line, absl::ByChar(' '), absl::SkipEmpty());
if (fields.size() != 6) {
return PosixError(EINVAL,
absl::StrFormat("Not enough tokens, got %d, line: %s",
fields.size(), line));
}
entry.spec = fields[0];
entry.mount_point = fields[1];
entry.fstype = fields[2];
entry.mount_opts = fields[3];
ASSIGN_OR_RETURN_ERRNO(entry.dump, Atoi<uint32_t>(fields[4]));
ASSIGN_OR_RETURN_ERRNO(entry.fsck, Atoi<uint32_t>(fields[5]));
entries.push_back(entry);
}
std::cerr << "<end of /proc/self/mounts>" << std::endl;
return entries;
}
PosixErrorOr<std::vector<ProcMountInfoEntry>> ProcSelfMountInfoEntries() {
std::string content;
RETURN_IF_ERRNO(GetContents("/proc/self/mountinfo", &content));
std::vector<ProcMountInfoEntry> entries;
std::vector<std::string> lines = absl::StrSplit(content, '\n');
std::cerr << "<contents of /proc/self/mountinfo>" << std::endl;
for (const std::string& line : lines) {
std::cerr << line << std::endl;
if (line.empty()) {
continue;
}
// Parse a single entry from /proc/self/mountinfo.
//
// Example entries:
//
// 22 28 0:20 / /sys rw,relatime shared:7 - sysfs sysfs rw
// 23 28 0:21 / /proc rw,relatime shared:14 - proc proc rw
// ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^
// 0 1 2 3 4 5 6 7 8 9 10
ProcMountInfoEntry entry;
std::vector<std::string> fields =
absl::StrSplit(line, absl::ByChar(' '), absl::SkipEmpty());
if (fields.size() < 10 || fields.size() > 11) {
return PosixError(
EINVAL,
absl::StrFormat("Unexpected number of tokens, got %d, line: %s",
fields.size(), line));
}
ASSIGN_OR_RETURN_ERRNO(entry.id, Atoi<uint64_t>(fields[0]));
ASSIGN_OR_RETURN_ERRNO(entry.parent_id, Atoi<uint64_t>(fields[1]));
std::vector<std::string> devs =
absl::StrSplit(fields[2], absl::ByChar(':'));
if (devs.size() != 2) {
return PosixError(
EINVAL,
absl::StrFormat(
"Failed to parse dev number field %s: too many tokens, got %d",
fields[2], devs.size()));
}
ASSIGN_OR_RETURN_ERRNO(entry.major, Atoi<dev_t>(devs[0]));
ASSIGN_OR_RETURN_ERRNO(entry.minor, Atoi<dev_t>(devs[1]));
entry.root = fields[3];
entry.mount_point = fields[4];
entry.mount_opts = fields[5];
// The optional field (fields[6]) may or may not be present. We know based
// on the total number of tokens.
int off = -1;
if (fields.size() == 11) {
entry.optional = fields[6];
off = 0;
}
// Field 7 is the optional field terminator char '-'.
entry.fstype = fields[8 + off];
entry.mount_source = fields[9 + off];
entry.super_opts = fields[10 + off];
entries.push_back(entry);
}
std::cerr << "<end of /proc/self/mountinfo>" << std::endl;
return entries;
}
absl::flat_hash_map<std::string, std::string> ParseMountOptions(
std::string mopts) {
absl::flat_hash_map<std::string, std::string> entries;
const std::vector<std::string> tokens =
absl::StrSplit(mopts, absl::ByChar(','), absl::SkipEmpty());
for (const auto& token : tokens) {
std::vector<std::string> kv =
absl::StrSplit(token, absl::MaxSplits('=', 1));
if (kv.size() == 2) {
entries[kv[0]] = kv[1];
} else if (kv.size() == 1) {
entries[kv[0]] = "";
} else {
TEST_CHECK_MSG(
false,
absl::StrFormat(
"Invalid mount option token '%s', was split into %d subtokens",
token, kv.size())
.c_str());
}
}
return entries;
}
} // namespace testing
} // namespace gvisor
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