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// file : libbuild2/config/init.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <libbuild2/config/init.hxx>
#include <libbuild2/file.hxx>
#include <libbuild2/rule.hxx>
#include <libbuild2/scope.hxx>
#include <libbuild2/context.hxx>
#include <libbuild2/filesystem.hxx> // exists()
#include <libbuild2/diagnostics.hxx>
#include <libbuild2/config/module.hxx>
#include <libbuild2/config/utility.hxx>
#include <libbuild2/config/operation.hxx>
using namespace std;
using namespace butl;
namespace build2
{
namespace config
{
bool
boot (scope& rs, const location&, unique_ptr<module_base>& mod)
{
tracer trace ("config::boot");
l5 ([&]{trace << "for " << rs;});
const string& mname (current_mname);
const string& oname (current_oname);
// Only create the module if we are configuring or creating. This is a
// bit tricky since the build2 core may not yet know if this is the
// case. But we know.
//
if (( mname == "configure" || mname == "create") ||
(mname.empty () && (oname == "configure" || oname == "create")))
{
unique_ptr<module> m (new module);
// Adjust priority for the import pseudo-module so that
// config.import.* values come first in config.build.
//
m->save_module ("import", INT32_MIN);
mod = move (m);
}
// Register meta-operations. Note that we don't register create_id
// since it will be pre-processed into configure.
//
rs.insert_meta_operation (configure_id, mo_configure);
rs.insert_meta_operation (disfigure_id, mo_disfigure);
return true; // Initialize first (load config.build).
}
bool
init (scope& rs,
scope&,
const location& l,
unique_ptr<module_base>&,
bool first,
bool,
const variable_map& config_hints)
{
tracer trace ("config::init");
if (!first)
{
warn (l) << "multiple config module initializations";
return true;
}
const dir_path& out_root (rs.out_path ());
l5 ([&]{trace << "for " << out_root;});
assert (config_hints.empty ()); // We don't known any hints.
auto& vp (var_pool.rw (rs));
// Load config.build if one exists (we don't need to worry about
// disfigure since we will never be init'ed).
//
const variable& c_v (vp.insert<uint64_t> ("config.version", false));
{
path f (config_file (rs));
if (exists (f))
{
// Check the config version. We assume that old versions cannot
// understand new configs and new versions are incompatible with old
// configs.
//
// We extract the value manually instead of loading and then
// checking in order to be able to fixup/migrate the file which we
// may want to do in the future.
//
{
// Assume missing version is 0.
//
auto p (extract_variable (f, c_v));
uint64_t v (p.second ? cast<uint64_t> (p.first) : 0);
if (v != module::version)
fail (l) << "incompatible config file " << f <<
info << "config file version " << v
<< (p.second ? "" : " (missing)") <<
info << "config module version " << module::version <<
info << "consider reconfiguring " << project (rs) << '@'
<< out_root;
}
source (rs, rs, f);
}
}
// Register alias and fallback rule for the configure meta-operation.
//
// We need this rule for out-of-any-project dependencies (e.g.,
// libraries imported from /usr/lib). We are registring it on the
// global scope similar to builtin rules.
//
{
auto& r (rs.global ().rules);
r.insert<mtime_target> (
configure_id, 0, "config.file", file_rule::instance);
}
{
auto& r (rs.rules);
//@@ outer
r.insert<alias> (configure_id, 0, "config.alias", alias_rule::instance);
// This allows a custom configure rule while doing nothing by default.
//
r.insert<target> (configure_id, 0, "config", noop_rule::instance);
r.insert<file> (configure_id, 0, "config.file", noop_rule::instance);
}
return true;
}
static const module_functions mod_functions[] =
{
{"config", &boot, &init},
{nullptr, nullptr, nullptr}
};
const module_functions*
build2_config_load ()
{
// Initialize the config entry points in the build system core.
//
config_save_variable = &save_variable;
config_preprocess_create = &preprocess_create;
return mod_functions;
}
}
}
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