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|
/*
* disk.cc - Implementation of the Key classes for disk manipulation
* libhscript, the HorizonScript library for
* Project Horizon
*
* Copyright (c) 2019 Adélie Linux and contributors. All rights reserved.
* This code is licensed under the AGPL 3.0 license, as noted in the
* LICENSE-code file in the root directory of this repository.
*
* SPDX-License-Identifier: AGPL-3.0-only
*/
#include <algorithm>
#include <cstring> /* strerror */
#include <fstream>
#include <set>
#include <string>
#ifdef HAS_INSTALL_ENV
# include <array>
# include <assert.h> /* assert */
# include <blkid/blkid.h> /* blkid_get_tag_value */
# include "util/filesystem.hh"
# include <libudev.h> /* udev_* */
# include <parted/parted.h> /* ped_* */
# include <spawn.h> /* posix_spawnp */
# include <sys/mount.h> /* mount */
# include <sys/stat.h> /* stat */
# include <sys/types.h> /* S_* */
# include <sys/wait.h> /* waitpid, W* */
# include <unistd.h> /* access */
#endif /* HAS_INSTALL_ENV */
#include "disk.hh"
#include "util/output.hh"
using namespace Horizon::Keys;
#ifdef HAS_INSTALL_ENV
/*! Determine if _block is a valid block device.
* @param key The key associated with this test.
* @param line The line number where the key exists.
* @param _block The path to test.
* @returns true if _block is valid, false otherwise.
* @note Will output_error if an error occurs.
*/
bool is_block_device(const std::string &key, long line,
const std::string &_block) {
struct stat blk_stat;
const char *block_c = _block.c_str();
if(access(block_c, F_OK) != 0 || stat(block_c, &blk_stat) != 0) {
output_error("installfile:" + std::to_string(line),
key + ": error opening device " + _block,
strerror(errno));
return false;
}
if(!S_ISBLK(blk_stat.st_mode)) {
output_error("installfile:" + std::to_string(line),
key + ": " + _block + " is not a valid block device");
return false;
}
return true;
}
#endif /* HAS_INSTALL_ENV */
Key *DiskId::parseFromData(const std::string &data, int lineno, int *errors,
int *) {
std::string block, ident;
std::string::size_type block_end = data.find_first_of(' ');
if(block_end == std::string::npos) {
if(errors) *errors += 1;
output_error("installfile:" + std::to_string(lineno),
"diskid: expected an identification string",
"valid format for diskid is: [block] [id-string]");
return nullptr;
}
block = data.substr(0, block_end);
ident = data.substr(block_end + 1);
return new DiskId(lineno, block, ident);
}
bool DiskId::validate(ScriptOptions options) const {
#ifdef HAS_INSTALL_ENV
/* We only validate if running in an Installation Environment. */
if(options.test(InstallEnvironment)) {
/* Unlike 'mount', 'diskid' *does* require that the block device exist
* before installation begins. This test is always valid. */
return is_block_device("diskid", this->lineno(), _block);
}
#endif /* HAS_INSTALL_ENV */
return true;
}
bool DiskId::execute(ScriptOptions options) const {
bool match = false;
output_info("installfile:" + std::to_string(line),
"diskid: Checking " + _block + " for identification string " +
_ident);
if(!options.test(InstallEnvironment)) return true;
#ifdef HAS_INSTALL_ENV
struct udev *udev;
struct udev_device *device;
const char *serial;
struct stat blk_stat;
const char *block_c = _block.c_str();
if(stat(block_c, &blk_stat) != 0) {
output_error("installfile:" + std::to_string(line),
"diskid: error opening device " + _block,
strerror(errno));
return false;
}
assert(S_ISBLK(blk_stat.st_mode));
udev = udev_new();
if(!udev) {
output_error("installfile:" + std::to_string(line),
"diskid: failed to communicate with udevd",
"cannot read disk information");
return false;
}
device = udev_device_new_from_devnum(udev, 'b', blk_stat.st_rdev);
if(!device) {
udev_unref(udev);
output_error("installfile:" + std::to_string(line),
"diskid: failed to retrieve disk from udevd",
"cannot read disk information");
return false;
}
serial = udev_device_get_property_value(device, "ID_SERIAL");
/* If we can't get the serial for this device, it's not a disk */
if(serial) {
std::string full_str(serial);
match = (full_str.find(_ident) != std::string::npos);
} else {
output_error("installfile:" + std::to_string(line),
"diskid: failed to retrieve disk identification",
"cannot read disk information");
}
if(!match) {
output_error("installfile:" + std::to_string(line),
"diskid: device does not match expected identification "
"string");
}
udev_device_unref(device);
udev_unref(udev);
#endif /* HAS_INSTALL_ENV */
return match;
}
Key *DiskLabel::parseFromData(const std::string &data, int lineno, int *errors,
int *) {
std::string block, label;
std::string::size_type sep = data.find_first_of(' ');
LabelType type;
/* REQ: Runner.Validate.disklabel.Validity */
if(sep == std::string::npos || data.length() == sep + 1) {
if(errors) *errors += 1;
output_error("installfile:" + std::to_string(lineno),
"disklabel: expected a label type",
"valid format for disklabel is: [disk] [type]");
return nullptr;
}
block = data.substr(0, sep);
label = data.substr(sep + 1);
std::transform(label.begin(), label.end(), label.begin(), ::tolower);
/* REQ: Runner.Validate.disklabel.LabelType */
if(label == "apm") {
type = APM;
} else if(label == "mbr") {
type = MBR;
} else if(label == "gpt") {
type = GPT;
} else {
if(errors) *errors += 1;
output_error("installfile:" + std::to_string(lineno),
"disklabel: '" + label + "' is not a valid label type",
"valid label types are: apm, mbr, gpt");
return nullptr;
}
return new DiskLabel(lineno, block, type);
}
bool DiskLabel::validate(ScriptOptions options) const {
#ifdef HAS_INSTALL_ENV
/* REQ: Runner.Validate.disklabel.Block */
if(options.test(InstallEnvironment)) {
/* disklabels are created before any others, so we can check now */
return is_block_device("disklabel", this->lineno(), _block);
}
#endif /* HAS_INSTALL_ENV */
return true;
}
bool DiskLabel::execute(ScriptOptions options) const {
std::string type_str;
switch(this->type()) {
case APM:
type_str = "apm";
break;
case MBR:
type_str = "mbr";
break;
case GPT:
type_str = "gpt";
break;
}
output_info("installfile:" + std::to_string(this->lineno()),
"disklabel: creating new " + type_str + " disklabel on " +
device());
if(options.test(Simulate)) {
std::cout << "parted -ms " << this->device() << " mklabel "
<< type_str << std::endl;
return true;
}
#ifdef HAS_INSTALL_ENV
PedDevice *pdevice = ped_device_get(this->device().c_str());
PedDiskType *label = ped_disk_type_get(type_str.c_str());
if(label == nullptr) {
output_error("installfile:" + std::to_string(this->lineno()),
"disklabel: Parted does not support label type " +
type_str + "!");
return false;
}
/* REQ: Runner.Execute.disklabel.Overwrite */
ped_disk_clobber(pdevice);
PedDisk *disk = ped_disk_new_fresh(pdevice, label);
if(disk == nullptr) {
output_error("installfile:" + std::to_string(this->lineno()),
"disklabel: internal error creating new " +
type_str + " disklabel on " + _block);
return false;
}
return (ped_disk_commit(disk) == 0);
#else
return false;
#endif /* HAS_INSTALL_ENV */
}
Key *Encrypt::parseFromData(const std::string &data, int lineno, int *errors,
int *) {
std::string::size_type sep = data.find(' ');
std::string dev, pass;
if(sep == std::string::npos) {
dev = data;
} else {
dev = data.substr(0, sep);
pass = data.substr(sep + 1);
}
if(dev.size() < 6 || dev.compare(0, 5, "/dev/")) {
if(errors) *errors += 1;
output_error("installfile:" + std::to_string(lineno),
"encrypt: expected path to block device");
return nullptr;
}
return new Encrypt(lineno, dev, pass);
}
bool Encrypt::validate(ScriptOptions) const {
return true;
}
bool Encrypt::execute(ScriptOptions) const {
return false;
}
/*! Parse a size string into a size and type.
* @param in_size (in) The string to parse.
* @param out_size (out) Where to which to write the size in bytes or %.
* @param type (out) The type of size determined.
* @returns true if the string was parseable, false otherwise.
*/
bool parse_size_string(const std::string &in_size, uint64_t *out_size, SizeType *type) {
std::string size(in_size), numbers, suffix;
std::string::size_type suffix_pos;
uint64_t multiplicand = 0;
/* Validate parameters */
if(out_size == nullptr || type == nullptr) {
return false;
}
/* Simpler since the string isn't case-sensitive. */
std::transform(size.cbegin(), size.cend(), size.begin(), ::tolower);
if(size == "fill") {
/* That was easy™ */
*type = SizeType::Fill;
*out_size = 0;
return true;
}
if(size.size() <= 1) {
/* at least two characters are required:
* - a 9 byte partition is invalid
*/
return false;
}
if(size.size() > 21) {
output_error("partition", "Value too large");
return false;
}
suffix_pos = size.find_first_not_of("12345667890");
/* this is always correct unless suffix is %, which is handled below */
*type = SizeType::Bytes;
try {
*out_size = std::stoul(size.substr(0, suffix_pos));
} catch(const std::exception &) {
/* something is wrong; throw the same error as a non-numeric value */
suffix_pos = 0;
}
if(suffix_pos == std::string::npos) {
output_warning("partition", "size has no suffix; assuming bytes");
return true;
}
if(suffix_pos == 0) {
output_error("partition", "size must be a whole number, "
"followed by optional suffix [K|M|G|T|%]");
return false;
}
suffix = size.substr(suffix_pos);
#define OVERFLOW_ON(MAX_VAL) \
if(*out_size > MAX_VAL) {\
output_error("partition", "Value too large");\
return false;\
}
switch(suffix[0]) {
case 'k':
multiplicand = 1024;
OVERFLOW_ON(0x3FFFFFFFFFFFFF)
break;
case 'm':
multiplicand = 1048576;
OVERFLOW_ON(0xFFFFFFFFFFF)
break;
case 'g':
multiplicand = 1073741824;
OVERFLOW_ON(0x3FFFFFFFF)
break;
case 't':
multiplicand = 1099511627776;
OVERFLOW_ON(0xFFFFFF)
break;
case '%':
*type = SizeType::Percent;
multiplicand = 1;
OVERFLOW_ON(100)
break;
}
#undef OVERFLOW_ON
/* if multiplicand is 0, it's an invalid suffix. */
if(suffix.size() != 1 || multiplicand == 0) {
output_error("partition", "size suffix must be K, M, G, T, or %");
return false;
}
*out_size *= multiplicand;
return true;
}
Key *Partition::parseFromData(const std::string &data, int lineno, int *errors,
int *) {
std::string block, pno, size_str, typecode;
std::string::size_type next_pos, last_pos;
int part_no;
SizeType size_type;
uint64_t size;
PartitionType type = None;
long spaces = std::count(data.cbegin(), data.cend(), ' ');
if(spaces < 2 || spaces > 3) {
if(errors) *errors += 1;
output_error("installfile:" + std::to_string(lineno),
"partition: expected either 3 or 4 elements, got: " +
std::to_string(spaces),
"syntax is: partition [block] [#] [size] ([type])");
return nullptr;
}
last_pos = next_pos = data.find_first_of(' ');
block = data.substr(0, next_pos);
if(block.compare(0, 4, "/dev")) {
if(errors) *errors += 1;
output_error("installfile:" + std::to_string(lineno),
"partition: expected path to block device",
"'" + block + "' is not a valid block device path");
return nullptr;
}
next_pos = data.find_first_of(' ', last_pos + 1);
pno = data.substr(last_pos + 1, next_pos - last_pos);
try {
part_no = std::stoi(pno);
} catch(const std::exception &) {
if(errors) *errors += 1;
output_error("installfile:" + std::to_string(lineno),
"partition: expected partition number, got", pno);
return nullptr;
}
last_pos = next_pos;
next_pos = data.find_first_of(' ', last_pos + 1);
if(next_pos == std::string::npos) {
size_str = data.substr(last_pos + 1);
} else {
size_str = data.substr(last_pos + 1, next_pos - last_pos - 1);
typecode = data.substr(next_pos + 1);
}
if(!parse_size_string(size_str, &size, &size_type)) {
if(errors) *errors += 1;
output_error("installfile:" + std::to_string(lineno),
"partition: invalid size", size_str);
return nullptr;
}
if(!typecode.empty()) {
std::transform(typecode.cbegin(), typecode.cend(), typecode.begin(),
::tolower);
if(typecode == "boot") {
type = Boot;
} else if(typecode == "esp") {
type = ESP;
} else {
if(errors) *errors += 1;
output_error("installfile:" + std::to_string(lineno),
"partition: expected type code, got: " + typecode,
"valid type codes are 'boot' and 'esp'");
return nullptr;
}
}
return new Partition(lineno, block, part_no, size_type, size, type);
}
bool Partition::validate(ScriptOptions opts) const {
#ifdef HAS_INSTALL_ENV
if(opts.test(InstallEnvironment)) {
/* REQ: Runner.Validate.partition.Block */
return is_block_device("partition", this->lineno(), this->device());
}
#endif /* HAS_INSTALL_ENV */
return true;
}
bool Partition::execute(ScriptOptions opts) const {
if(opts.test(Simulate)) {
output_error("installfile:" + std::to_string(this->lineno()),
"partition: Not supported in Simulation mode");
return true;
}
#ifdef HAS_INSTALL_ENV
PedDevice *dev = ped_device_get(this->device().c_str());
if(dev == nullptr) {
output_error("installfile:" + std::to_string(this->lineno()),
"partition: error opening device " + this->device());
return false;
}
PedDisk *disk = ped_disk_new(dev);
if(disk == nullptr) {
output_error("installfile:" + std::to_string(this->lineno()),
"partition: error reading device " + this->device());
return false;
}
int last = ped_disk_get_last_partition_num(disk);
/* no partitions = 0 partitions */
if(last == -1) last = 0;
if(last != (this->partno() - 1)) {
output_error("installfile:" + std::to_string(this->lineno()),
"partition: consistency error on " + this->device(),
"Partition #" + std::to_string(this->partno()) +
" has been requested, but the disk has " +
std::to_string(last) + " partitions");
ped_disk_destroy(disk);
return false;
}
PedPartition *before, *me;
PedSector start = 0;
PedSector size;
if(last > 0) {
before = ped_disk_get_partition(disk, last);
if(before == nullptr) {
output_error("installfile:" + std::to_string(this->lineno()),
"partition: error reading partition table on " +
this->device());
ped_disk_destroy(disk);
return false;
}
start = before->geom.end + 1;
}
switch(this->size_type()) {
case SizeType::Bytes:
size = static_cast<int64_t>(this->size()) / dev->sector_size;
break;
case SizeType::Percent:
size = dev->length * (this->size() / 100.0);
break;
case SizeType::Fill:
size = dev->length - start;
break;
}
me = ped_partition_new(disk, PED_PARTITION_NORMAL, nullptr,
start, start + size);
if(me == nullptr) {
output_error("installfile:" + std::to_string(this->lineno()),
"partition: error creating partition on " +
this->device());
ped_disk_destroy(disk);
return false;
}
ped_disk_add_partition(disk, me, ped_constraint_any(dev));
ped_disk_destroy(disk);
#endif /* HAS_INSTALL_ENV */
return true;
}
Key *LVMPhysical::parseFromData(const std::string &data, int lineno,
int *errors, int *) {
if(data.size() < 6 || data.substr(0, 5) != "/dev/") {
if(errors) *errors += 1;
output_error("installfile:" + std::to_string(lineno),
"lvm_pv: expected an absolute path to a block device");
return nullptr;
}
return new LVMPhysical(lineno, data);
}
bool LVMPhysical::execute(ScriptOptions) const {
return false;
}
/*! Determine if a string is a valid LVM VG/LV name.
* @param name The name of which to test validity.
* @returns true if the string is a valid name, false otherwise.
* @note LVM LVs have additional restrictions; see is_valid_lvm_lv_name.
*/
bool is_valid_lvm_name(const std::string &name) {
if(name[0] == '.' && (name.length() == 1 || name[1] == '.')) {
/* . and .. are invalid */
return false;
}
if(name[0] == '-') {
/* VG nor LV may start with - */
return false;
}
const std::string valid_syms("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+_.-");
return (name.find_first_not_of(valid_syms) == std::string::npos);
}
/*! Determine if a string is a valid LVM LV name.
* @param name The name of which to test validity.
* @returns true if the string is a valid LV name, false otherwise.
*/
bool is_valid_lvm_lv_name(const std::string &name) {
if(!is_valid_lvm_name(name)) {
/* Fail fast if we fail the general test. */
return false;
}
if(name == "snapshot" || name == "pvmove") {
/* Invalid full names. */
return false;
}
if(name.find("_cdata") != std::string::npos ||
name.find("_cmeta") != std::string::npos ||
name.find("_corig") != std::string::npos ||
name.find("_mlog") != std::string::npos ||
name.find("_mimage") != std::string::npos ||
name.find("_pmspare") != std::string::npos ||
name.find("_rimage") != std::string::npos ||
name.find("_rmeta") != std::string::npos ||
name.find("_tdata") != std::string::npos ||
name.find("_tmeta") != std::string::npos ||
name.find("_vorigin") != std::string::npos) {
/* Cannot occur anywhere in the name. */
return false;
}
return true;
}
Key *LVMGroup::parseFromData(const std::string &data, int lineno, int *errors,
int *) {
std::string::size_type space = data.find_first_of(' ');
if(space == std::string::npos || data.size() == space + 1) {
if(errors) *errors += 1;
output_error("installfile:" + std::to_string(lineno),
"lvm_vg: expected exactly two elements",
"syntax is lvm_vg [pv_block] [name-of-vg]");
return nullptr;
}
const std::string pv(data.substr(0, space));
const std::string name(data.substr(space + 1));
if(pv.length() < 6 || pv.substr(0, 5) != "/dev/") {
if(errors) *errors += 1;
output_error("installfile:" + std::to_string(lineno),
"lvm_vg: expected absolute path to block device");
return nullptr;
}
if(!is_valid_lvm_name(name)) {
if(errors) *errors += 1;
output_error("installfile:" + std::to_string(lineno),
"lvm_vg: invalid volume group name");
return nullptr;
}
return new LVMGroup(lineno, pv, name);
}
bool LVMGroup::validate(ScriptOptions) const {
/* validation occurs during parsing */
return true;
}
bool LVMGroup::test_pv(ScriptOptions) const {
#ifdef HAS_INSTALL_ENV
const char *fstype = blkid_get_tag_value(nullptr, "TYPE",
this->pv().c_str());
if(fstype == nullptr) {
/* inconclusive */
return true;
}
return (strcmp(fstype, "LVM2_member") == 0);
#else
return true;
#endif
}
bool LVMGroup::execute(ScriptOptions) const {
return false;
}
Key *LVMVolume::parseFromData(const std::string &data, int lineno, int *errors,
int *) {
std::string vg, name, size_str;
std::string::size_type name_start, size_start;
SizeType size_type;
uint64_t size;
long spaces = std::count(data.cbegin(), data.cend(), ' ');
if(spaces != 2) {
if(errors) *errors += 1;
output_error("installfile:" + std::to_string(lineno),
"lvm_lv: expected 3 elements, got: " +
std::to_string(spaces),
"syntax is: lvm_lv [vg] [name] [size]");
return nullptr;
}
name_start = data.find_first_of(' ');
vg = data.substr(0, name_start);
size_start = data.find_first_of(' ', name_start + 1);
name = data.substr(name_start + 1, size_start - name_start - 1);
size_str = data.substr(size_start + 1);
if(!is_valid_lvm_name(vg)) {
if(errors) *errors += 1;
output_error("installfile:" + std::to_string(lineno),
"lvm_lv: invalid volume group name");
return nullptr;
}
if(!is_valid_lvm_lv_name(name)) {
if(errors) *errors += 1;
output_error("installfile:" + std::to_string(lineno),
"lvm_lv: invalid volume name");
return nullptr;
}
if(!parse_size_string(size_str, &size, &size_type)) {
if(errors) *errors += 1;
output_error("installfile:" + std::to_string(lineno),
"lvm_lv: invalid size", size_str);
return nullptr;
}
return new LVMVolume(lineno, vg, name, size_type, size);
}
bool LVMVolume::validate(ScriptOptions) const {
return true;
}
bool LVMVolume::execute(ScriptOptions) const {
return false;
}
const static std::set<std::string> valid_fses = {
"ext2", "ext3", "ext4", "jfs", "vfat", "xfs"
};
Key *Filesystem::parseFromData(const std::string &data, int lineno,
int *errors, int *) {
if(std::count(data.begin(), data.end(), ' ') != 1) {
if(errors) *errors += 1;
output_error("installfile:" + std::to_string(lineno),
"fs: expected exactly two elements",
"syntax is: fs [device] [fstype]");
return nullptr;
}
std::string::size_type sep = data.find(' ');
std::string device(data.substr(0, sep));
std::string fstype(data.substr(sep + 1));
FilesystemType type;
if(device.size() < 6 || device.compare(0, 5, "/dev/")) {
if(errors) *errors += 1;
output_error("installfile:" + std::to_string(lineno),
"fs: element 1: expected device node",
"'" + device + "' is not a valid device node");
return nullptr;
}
if(valid_fses.find(fstype) == valid_fses.end()) {
std::string fses;
for(auto &&fs : valid_fses) fses += fs + " ";
if(errors) *errors += 1;
output_error("installfile:" + std::to_string(lineno),
"fs: element 2: expected filesystem type",
"valid filesystems are: " + fses);
return nullptr;
}
if(fstype == "ext2") {
type = Ext2;
} else if(fstype == "ext3") {
type = Ext3;
} else if(fstype == "ext4") {
type = Ext4;
} else if(fstype == "jfs") {
type = JFS;
} else if(fstype == "vfat") {
type = VFAT;
} else {
type = XFS;
}
return new Filesystem(lineno, device, type);
}
bool Filesystem::validate(ScriptOptions) const {
/* Validation is done during parsing. */
return true;
}
bool Filesystem::execute(ScriptOptions opts) const {
std::string cmd;
std::vector<std::string> args;
switch(_type) {
case Ext2:
cmd = "mkfs.ext2";
break;
case Ext3:
cmd = "mkfs.ext3";
break;
case Ext4:
cmd = "mkfs.ext4";
break;
case JFS:
cmd = "mkfs.jfs";
args.push_back("-q");
break;
case VFAT:
cmd = "mkfs.vfat";
args.push_back("-F32");
break;
case XFS:
cmd = "mkfs.xfs";
args.push_back("-f");
break;
}
if(_type == Ext2 || _type == Ext3 || _type == Ext4) {
const std::string dev_node(
device().substr(device().find_last_of('/') + 1));
args.push_back("-q");
args.push_back("-z");
args.push_back("/tmp/undo-" + dev_node);
}
args.push_back(_block);
if(opts.test(Simulate)) {
std::cout << cmd;
for(auto &&arg : args) {
std::cout << " " << arg;
}
std::cout << std::endl;
return true;
}
#ifdef HAS_INSTALL_ENV
const char **argv = new const char*[args.size() + 1];
pid_t child;
int status;
argv[0] = cmd.c_str();
for(unsigned long index = 0; index < args.size(); index++) {
argv[index + 1] = args.at(index).c_str();
}
status = posix_spawnp(&child, cmd.c_str(), nullptr, nullptr,
const_cast<char * const *>(argv), nullptr);
if(status != 0) {
/* extremely unlikely failure case */
output_error("installfile:" + std::to_string(this->lineno()),
"filesystem: cannot fork", strerror(status));
delete[] argv;
return false;
}
delete[] argv;
if(waitpid(child, &status, 0) == -1) {
/* unlikely failure case */
output_error("installfile:" + std::to_string(this->lineno()),
"filesystem: waitpid", strerror(errno));
return false;
}
if(!WIFEXITED(status)) {
output_error("installfile:" + std::to_string(this->lineno()),
"filesystem: received fatal signal " +
std::to_string(WTERMSIG(status)) + " while running " +
cmd);
return false;
}
if(WEXITSTATUS(status) != 0) {
output_error("installfile:" + std::to_string(this->lineno()),
"filesystem: " + cmd + " exited with status " +
std::to_string(WEXITSTATUS(status)));
return false;
}
#endif /* HAS_INSTALL_ENV */
return true;
}
Key *Mount::parseFromData(const std::string &data, int lineno, int *errors,
int *) {
std::string dev, where, opt;
std::string::size_type where_pos, opt_pos;
bool any_failure = false;
long spaces = std::count(data.cbegin(), data.cend(), ' ');
if(spaces < 1 || spaces > 2) {
if(errors) *errors += 1;
/* Don't bother with any_failure, because this is immediately fatal. */
output_error("installfile:" + std::to_string(lineno),
"mount: expected either 2 or 3 elements, got: " +
std::to_string(spaces), "");
return nullptr;
}
where_pos = data.find_first_of(' ');
opt_pos = data.find_first_of(' ', where_pos + 1);
dev = data.substr(0, where_pos);
where = data.substr(where_pos + 1, (opt_pos - where_pos - 1));
if(opt_pos != std::string::npos && data.length() > opt_pos + 1) {
opt = data.substr(opt_pos + 1);
}
if(dev.compare(0, 4, "/dev")) {
if(errors) *errors += 1;
any_failure = true;
output_error("installfile:" + std::to_string(lineno),
"mount: element 1: expected device node",
"'" + dev + "' is not a valid device node");
}
if(where[0] != '/') {
if(errors) *errors += 1;
any_failure = true;
output_error("installfile:" + std::to_string(lineno),
"mount: element 2: expected absolute path",
"'" + where + "' is not a valid absolute path");
}
if(any_failure) return nullptr;
return new Mount(lineno, dev, where, opt);
}
bool Mount::validate(ScriptOptions) const {
return true;
}
bool Mount::execute(ScriptOptions options) const {
const std::string actual_mount = "/target" + this->mountpoint();
const char *fstype = nullptr;
#ifdef HAS_INSTALL_ENV
error_code ec;
#endif
/* We have to get the filesystem for the node. */
if(options.test(Simulate)) {
fstype = "auto";
}
#ifdef HAS_INSTALL_ENV
else {
fstype = blkid_get_tag_value(nullptr, "TYPE", this->device().c_str());
if(fstype == nullptr) {
output_error("installfile:" + std::to_string(this->lineno()),
"mount: cannot determine filesystem type for device",
this->device());
return false;
}
}
#endif /* HAS_INSTALL_ENV */
output_info("installfile:" + std::to_string(this->lineno()),
"mount: mounting " + this->device() + " on " +
this->mountpoint());
if(options.test(Simulate)) {
std::cout << "mount ";
if(!this->options().empty()) {
std::cout << "-o " << this->options() << " ";
}
std::cout << this->device() << " " << actual_mount << std::endl;
}
#ifdef HAS_INSTALL_ENV
else {
/* mount */
if(!fs::exists(actual_mount, ec)) {
fs::create_directory(actual_mount, ec);
if(ec) {
output_error("installfile:" + std::to_string(this->lineno()),
"mount: failed to create target directory for "
+ this->mountpoint(), ec.message());
return false;
}
}
if(mount(this->device().c_str(), actual_mount.c_str(), fstype, 0,
this->options().c_str()) != 0) {
output_warning("installfile:" + std::to_string(this->lineno()),
"mount: error mounting " + this->mountpoint() +
"with options; retrying without", strerror(errno));
if(mount(this->device().c_str(), actual_mount.c_str(), fstype, 0,
nullptr) != 0) {
output_error("installfile:" + std::to_string(this->lineno()),
"mount: error mounting " + this->mountpoint() +
"without options", strerror(errno));
return false;
}
}
}
#endif /* HAS_INSTALL_ENV */
/* Handle fstab. We're guaranteed to have a /target since mount has
* already ran and /target is the first mount done.
*/
output_info("installfile:" + std::to_string(this->lineno()),
"mount: adding " + this->mountpoint() + " to /etc/fstab");
char pass = (this->mountpoint() == "/" ? '1' : '0');
const std::string fstab_opts = (this->options().empty() ?
"defaults" : this->options());
if(options.test(Simulate)) {
if(this->mountpoint() == "/") {
std::cout << "mkdir -p /target/etc" << std::endl;
}
std::cout << "printf '%s\\t%s\\t%s\\t%s\\t0\\t" << pass << "\\"
<< "n' " << this->device() << " " << this->mountpoint()
<< " " << fstype << " " << fstab_opts
<< " >> /target/etc/fstab" << std::endl;
}
#ifdef HAS_INSTALL_ENV
else {
if(this->mountpoint() == "/") {
fs::create_directory("/target/etc", ec);
if(ec) {
output_error("installfile:" + std::to_string(this->lineno()),
"mount: failed to create /etc for target",
ec.message());
return false;
}
fs::permissions("/target/etc", rwxr_xr_x,
#if defined(FS_IS_STDCXX)
fs::perm_options::replace,
#endif
ec);
if(ec) {
output_warning("installfile:" + std::to_string(this->lineno()),
"mount: failed to set permissions for target /etc",
ec.message());
}
}
std::ofstream fstab_f("/target/etc/fstab");
if(!fstab_f) {
output_error("installfile:" + std::to_string(this->lineno()),
"mount: failure opening /etc/fstab for writing");
return false;
}
fstab_f << this->device() << "\t" << this->mountpoint() << "\t"
<< fstype << "\t" << fstab_opts << "\t0\t" << pass
<< std::endl;
}
#endif /* HAS_INSTALL_ENV */
return true;
}
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