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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 <blkid/blkid.h> /* blkid_get_tag_value */
#include <cstring> /* strerror */
#include <fstream>
#include <string>
#include <sys/mount.h> /* mount */
#include <sys/stat.h> /* mkdir, stat */
#include <sys/types.h> /* S_* */
#include <unistd.h> /* access */
#include "disk.hh"
#include "util/output.hh"
using namespace Horizon::Keys;
Key *DiskId::parseFromData(const std::string &data, int lineno, int *errors,
int *warnings) {
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 {
/* We only validate if running in an Installation Environment. */
if(!options.test(InstallEnvironment)) return true;
/* Unlike 'mount', 'diskid' *does* require that the block device exist
* before installation begins. This test is always valid. */
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),
"diskid: error opening device " + _block,
strerror(errno));
return false;
}
if(!S_ISBLK(blk_stat.st_mode)) {
output_error("installfile:" + std::to_string(line),
"diskid: " + _block + " is not a valid block device");
return false;
}
return true;
}
bool DiskId::execute(ScriptOptions options) const {
return false;
}
Key *Mount::parseFromData(const std::string &data, int lineno, int *errors,
int *warnings) {
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 options) const {
/* We only validate if running in an Installation Environment. */
if(!options.test(InstallEnvironment)) return true;
/* XXX TODO: This will fail validation if the block device does not
* already exist. However, we must take in to account that block devices
* may not yet exist during the script validation phase. This check may
* need to happen in Script::validate like the Uniqueness tests. */
return(access(this->device().c_str(), F_OK) == 0);
}
bool Mount::execute(ScriptOptions options) const {
const std::string actual_mount = "/target" + this->mountpoint();
const char *fstype = nullptr;
/* We have to get the filesystem for the node. */
if(options.test(Simulate)) {
fstype = "auto";
} 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;
}
}
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;
} else {
/* mount */
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;
}
}
}
/* 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;
} else {
if(this->mountpoint() == "/") {
/* failure of mkdir will be handled in the !fstab_f case */
mkdir("/target/etc",
S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
}
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;
}
return true;
}
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