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/*
* This source code is released into the public domain.
*/
/*
* ZFS handling.
*/
#include "config_string.hh"
#include "exec.hh"
#include "generic_error.hh"
#include "jail_zfs.hh"
using namespace lfjail;
using namespace std::literals;
namespace lfjail::zfs {
config::string_option filesystem(
"zfs.filesystem"sv,
"The ZFS filesystem under which jails are created"sv);
config::string_option mountpoint(
"zfs.mountpoint"sv,
"The location where the ZFS hierarchy will be mounted"sv);
} // namespace lfjail::zfs
namespace {
/*
* Test if the given ZFS dataset exists.
*/
auto dataset_exists(std::string const &/*ds*/) -> bool {
throw("not implemented");
#if 0
auto sout = std::string();
auto serr = std::string();
auto const ret = lfjail::cexecl(
std::back_inserter(sout),
std::back_inserter(serr),
"/sbin/zfs",
"zfs", "get", "-H", "-ovalue", "name", ds);
return (ret == 0);
#endif
}
/*
* Create a new ZFS dataset.
*/
template<typename... Args>
void dataset_create(std::string const &/*ds*/, Args&& .../*args*/) {
throw("not implemented");
#if 0
std::vector<std::string> argv;
argv.emplace_back("zfs");
argv.emplace_back("create");
(argv.emplace_back(std::format("-o{}", std::forward<Args>(args))), ...);
argv.emplace_back(ds);
auto sout = std::string();
auto serr = std::string();
auto const ret = lfjail::cexec(std::back_inserter(sout),
std::back_inserter(serr),
"/sbin/zfs", argv);
if (!serr.empty())
throw generic_error("zfs create failed: {}", serr);
if (ret != 0)
throw generic_error("zfs create failed: {}", ret);
#endif
}
/*
* Destroy a ZFS datset.
*/
void dataset_destroy(std::string const &/*ds*/) {
throw("not implemented");
#if 0
auto sout = std::string();
auto serr = std::string();
int ret = lfjail::cexecl(std::back_inserter(sout),
std::back_inserter(serr),
"/sbin/zfs",
"zfs", "destroy", "-r", ds);
if (!serr.empty())
throw generic_error("zfs destroy failed: {}", serr);
if (ret != 0)
throw generic_error("zfs destroy failed: {}", ret);
#endif
}
/*
* Return a ZFS properly for a fileystem.
*/
auto get_property(std::string const &/*fs*/, std::string const &/*prop*/)
-> std::string
{
throw("not implemented");
#if 0
auto sout = std::string();
auto serr = std::string();
int ret = lfjail::cexecl(
std::back_inserter(sout),
std::back_inserter(serr),
"/sbin/zfs",
"zfs", "get", "-H", "-ovalue", prop, fs);
if (!serr.empty())
throw generic_error("zfs get failed: {}", serr);
if (ret != 0)
throw generic_error("zfs get failed: {}", ret);
if (sout[sout.size() - 1] == '\n')
sout.resize(sout.size() - 1);
return sout;
#endif
}
/*
* Make sure our top-level ZFS dataset exists.
*/
void ensure_jroot(context const &) {
auto jroot = lfjail::zfs::filesystem.string();
auto mntpt = lfjail::zfs::mountpoint.string();
if (dataset_exists(jroot))
return;
auto mntptopt = std::format("mountpoint={}", mntpt);
dataset_create(jroot, mntptopt);
}
} // anonymous namespace
namespace lfjail::zfs {
void create_for_jail(context const &ctx, jail const &jailconf) {
if (filesystem.string().empty())
throw generic_error("zfs.filesystem is not set");
if (mountpoint.string().empty())
throw generic_error("zfs.mountpoint is not set");
ensure_jroot(ctx);
auto const ds = filesystem.string() + "/" + jailconf.name;
dataset_create(ds);
}
void destroy_for_jail(context const &, jail const &jailconf) {
auto const dataset = filesystem.string() + "/" + jailconf.name;
dataset_destroy(dataset);
}
auto jail_root(context const &ctx) -> std::string {
std::ignore = ctx;
auto fs = filesystem.string();
if (fs.empty())
throw generic_error("zfs.filesystem not set");
return get_property(fs, "mountpoing");
}
} // namespace lfjail::zfs
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