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/*
* tar.cc - Implementation of the tarball Horizon Image Creation backend
* image, the image processing utilities for
* Project Horizon
*
* Copyright (c) 2020 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 <archive.h>
#include <archive_entry.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include "basic.hh"
#include "hscript/util.hh"
#include "util/filesystem.hh"
#include "util/output.hh"
namespace Horizon {
namespace Image {
class TarBackend : public BasicBackend {
public:
enum CompressionType {
None,
GZip,
BZip2,
XZ
};
private:
CompressionType comp;
struct archive *a;
public:
TarBackend(const std::string &ir, const std::string &out,
const std::map<std::string, std::string> &opts,
CompressionType _c = None)
: BasicBackend{ir, out, opts}, comp{_c} {};
int prepare() override {
int res;
error_code ec;
a = archive_write_new();
archive_write_set_format_pax_restricted(a);
switch(comp) {
case None:
break;
case GZip:
archive_write_add_filter_gzip(a);
break;
case BZip2:
archive_write_add_filter_bzip2(a);
break;
case XZ:
archive_write_add_filter_xz(a);
break;
}
output_info("tar backend", "creating directory tree");
fs::create_directory(this->ir_dir, ec);
if(ec && ec.value() != EEXIST) {
output_error("tar backend", "could not create IR directory",
ec.message());
return 1;
}
fs::create_directory(this->ir_dir + "/target", ec);
if(ec && ec.value() != EEXIST) {
output_error("tar backend", "could not create target directory",
ec.message());
return 1;
}
res = archive_write_open_filename(a, this->out_path.c_str());
if(res < ARCHIVE_OK) {
if(res < ARCHIVE_WARN) {
output_error("tar backend", archive_error_string(a));
return res;
} else {
output_warning("tar backend", archive_error_string(a));
}
}
return 0;
}
int create() override {
struct archive_entry *entry = archive_entry_new();
error_code ec;
int fd, r, code = 0;
struct stat s;
void *buff;
std::string target = this->ir_dir + "/target";
run_command("umount", {"-R", (ir_dir + "/target/sys")});
umount((ir_dir + "/target/proc").c_str());
run_command("umount", {"-R", (ir_dir + "/target/dev")});
for(const auto& dent : fs::recursive_directory_iterator(target, ec)) {
fs::path relpath = dent.path().lexically_relative(target);
std::string pathstr(dent.path().native());
#define OUTPUT_FAILURE(x) \
output_error("tar backend", "failed to " x " '" + pathstr + "'",\
strerror(errno));
r = lstat(pathstr.c_str(), &s);
if(r == -1) {
OUTPUT_FAILURE("stat")
code = -1;
goto ret;
}
archive_entry_copy_stat(entry, &s);
if(fs::is_symlink(dent)) {
archive_entry_set_filetype(entry, AE_IFLNK);
fs::path resolved = fs::read_symlink(dent.path(), ec);
if(ec) {
output_error("tar backend", "failed to read symlink",
strerror(ec.value()));
code = -1;
goto ret;
}
const auto r_path = resolved.native();
archive_entry_update_symlink_utf8(entry, r_path.c_str());
}
archive_entry_update_pathname_utf8(entry, relpath.native().c_str());
if(archive_write_header(this->a, entry) != ARCHIVE_OK) {
output_error("tar backend", archive_error_string(a));
code = -1;
goto ret;
}
if(fs::is_regular_file(dent) && !fs::is_symlink(dent) &&
s.st_size > 0) {
fd = open(pathstr.c_str(), O_RDONLY);
if(fd == -1) {
OUTPUT_FAILURE("open")
code = -1;
goto ret;
}
buff = mmap(NULL, s.st_size, PROT_READ, MAP_SHARED, fd, 0);
if(buff == MAP_FAILED) {
OUTPUT_FAILURE("map")
close(fd);
code = -1;
goto ret;
}
archive_write_data(this->a, buff, s.st_size);
close(fd);
}
archive_write_finish_entry(this->a);
archive_entry_clear(entry);
}
ret:
archive_entry_free(entry);
return code;
}
int finalise() override {
archive_write_close(a);
archive_write_free(a);
return 0;
}
};
__attribute__((constructor(400)))
void register_tar_backend() {
BackendManager::register_backend(
{"tar", "Create a tarball (.tar)",
[](const std::string &ir_dir, const std::string &out_path,
const std::map<std::string, std::string> &opts) {
return new TarBackend(ir_dir, out_path, opts);
}
});
BackendManager::register_backend(
{"tgz", "Create a tarball with GZ compression (.tar.gz)",
[](const std::string &ir_dir, const std::string &out_path,
const std::map<std::string, std::string> &opts) {
return new TarBackend(ir_dir, out_path, opts, TarBackend::GZip);
}
});
BackendManager::register_backend(
{"tbz", "Create a tarball with BZip2 compression (.tar.bz2)",
[](const std::string &ir_dir, const std::string &out_path,
const std::map<std::string, std::string> &opts) {
return new TarBackend(ir_dir, out_path, opts, TarBackend::BZip2);
}
});
BackendManager::register_backend(
{"txz", "Create a tarball with XZ compression (.tar.xz)",
[](const std::string &ir_dir, const std::string &out_path,
const std::map<std::string, std::string> &opts) {
return new TarBackend(ir_dir, out_path, opts, TarBackend::XZ);
}
});
}
}
}
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