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|
// file : build2/file.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <build2/file>
#include <iostream> // cin
#include <butl/filesystem> // file_exists()
#include <build2/scope>
#include <build2/context>
#include <build2/prerequisite>
#include <build2/diagnostics>
#include <build2/token>
#include <build2/lexer>
#include <build2/parser>
#include <build2/config/utility>
using namespace std;
using namespace butl;
namespace build2
{
const dir_path build_dir ("build");
const dir_path bootstrap_dir (dir_path (build_dir) /= "bootstrap");
const path root_file (build_dir / "root.build");
const path bootstrap_file (build_dir / "bootstrap.build");
const path src_root_file (bootstrap_dir / "src-root.build");
const path export_file (build_dir / "export.build");
// While strictly speaking it belongs in, say, config/module.cxx, the static
// initialization order strikes again. If we ever make the config module
// loadable, then we can move it there.
//
const path config_file (build_dir / "config.build");
bool
is_src_root (const dir_path& d)
{
// @@ Can we have root without bootstrap? I don't think so.
//
return file_exists (d / bootstrap_file) || file_exists (d / root_file);
}
bool
is_out_root (const dir_path& d)
{
return file_exists (d / src_root_file);
}
dir_path
find_src_root (const dir_path& b)
{
for (dir_path d (b); !d.root () && d != home; d = d.directory ())
{
if (is_src_root (d))
return d;
}
return dir_path ();
}
dir_path
find_out_root (const dir_path& b, bool* src)
{
for (dir_path d (b); !d.root () && d != home; d = d.directory ())
{
bool s (false);
if ((s = is_src_root (d)) || is_out_root (d)) // Order is important!
{
if (src != nullptr)
*src = s;
return d;
}
}
return dir_path ();
}
static void
source (const path& bf, scope& root, scope& base, bool boot)
{
tracer trace ("source");
try
{
bool sin (bf.string () == "-");
ifdstream ifs;
if (!sin)
ifs.open (bf);
else
cin.exceptions (ifdstream::failbit | ifdstream::badbit);
istream& is (sin ? cin : ifs);
l5 ([&]{trace << "sourcing " << bf;});
parser p (boot);
p.parse_buildfile (is, bf, root, base);
}
catch (const ifdstream::failure& e)
{
fail << "unable to read buildfile " << bf << ": " << e.what ();
}
}
void
source (const path& bf, scope& root, scope& base)
{
return source (bf, root, base, false);
}
void
source_once (const path& bf, scope& root, scope& base, scope& once)
{
tracer trace ("source_once");
if (!once.buildfiles.insert (bf).second)
{
l5 ([&]{trace << "skipping already sourced " << bf;});
return;
}
source (bf, root, base);
}
scope&
create_root (const dir_path& out_root, const dir_path& src_root)
{
auto i (scopes.insert (out_root, true));
scope& rs (i->second);
// Set out_path. src_path is set in setup_root() below.
//
if (rs.out_path_ != &i->first)
{
assert (rs.out_path_ == nullptr);
rs.out_path_ = &i->first;
}
// First time create_root() is called on this scope.
//
bool first (rs.meta_operations.empty ());
// Enter built-in meta-operation and operation names. Loading of
// modules (via the src bootstrap; see below) can result in
// additional meta/operations being added.
//
if (first)
{
rs.meta_operations.insert (perform_id, perform);
rs.operations.insert (default_id, default_);
rs.operations.insert (update_id, update);
rs.operations.insert (clean_id, clean);
}
// If this is already a root scope, verify that things are
// consistent.
//
{
value& v (rs.assign ("out_root"));
if (!v)
v = out_root;
else
{
const dir_path& p (cast<dir_path> (v));
if (p != out_root)
fail << "new out_root " << out_root << " does not match "
<< "existing " << p;
}
}
if (!src_root.empty ())
{
value& v (rs.assign ("src_root"));
if (!v)
v = src_root;
else
{
const dir_path& p (cast<dir_path> (v));
if (p != src_root)
fail << "new src_root " << src_root << " does not match "
<< "existing " << p;
}
}
return rs;
}
void
setup_root (scope& s)
{
// The caller must have made sure src_root is set on this scope.
//
value& v (s.assign ("src_root"));
assert (v);
const dir_path& d (cast<dir_path> (v));
if (s.src_path_ == nullptr)
s.src_path_ = &d;
else
assert (s.src_path_ == &d);
}
scope&
setup_base (scope_map::iterator i,
const dir_path& out_base,
const dir_path& src_base)
{
scope& s (i->second);
// Set src/out_base variables.
//
value& ov (s.assign ("out_base"));
if (!ov)
ov = out_base;
else
assert (cast<dir_path> (ov) == out_base);
value& sv (s.assign ("src_base"));
if (!sv)
sv = src_base;
else
assert (cast<dir_path> (sv) == src_base);
// Set src/out_path. The key (i->first) is out_base.
//
if (s.out_path_ == nullptr)
s.out_path_ = &i->first;
else
assert (*s.out_path_ == out_base);
if (s.src_path_ == nullptr)
s.src_path_ = &cast<dir_path> (sv);
else
assert (*s.src_path_ == src_base);
return s;
}
void
bootstrap_out (scope& root)
{
path bf (root.out_path () / src_root_file);
if (!file_exists (bf))
return;
//@@ TODO: if bootstrap files can source other bootstrap files
// (the way to express dependecies), then we need a way to
// prevent multiple sourcing. We handle it here but we still
// need something like source_once (once [scope] source).
//
source_once (bf, root, root);
}
// Extract the specified variable value from a buildfile. It is expected to
// be the first non-comment line and not to rely on any variable expansion
// other than those from the global scope or any variable overrides.
//
pair<value, bool>
extract_variable (const path& bf, const char* name)
{
try
{
ifdstream ifs (bf);
lexer lex (ifs, bf);
token t (lex.next ());
token_type tt;
if (t.type != token_type::name || t.value != name ||
((tt = lex.next ().type) != token_type::assign &&
tt != token_type::prepend &&
tt != token_type::append))
{
return make_pair (value (), false);
}
const variable& var (var_pool.find (move (t.value)));
parser p;
temp_scope tmp (*global_scope);
p.parse_variable (lex, tmp, var, tt);
value* v (tmp.vars.find (var));
assert (v != nullptr);
// Steal the value, the scope is going away.
//
return make_pair (move (*v), true);
}
catch (const ifdstream::failure& e)
{
error << "unable to read buildfile " << bf << ": " << e.what ();
throw failed ();
}
// Never reached.
}
// Extract the project name from bootstrap.build.
//
static string
find_project_name (const dir_path& out_root,
const dir_path& fallback_src_root,
bool* src_hint = nullptr)
{
tracer trace ("find_project_name");
// Load the project name. If this subdirectory is the subproject's
// src_root, then we can get directly to that. Otherwise, we first
// have to discover its src_root.
//
const dir_path* src_root;
value src_root_v; // Need it to live until the end.
if (src_hint != nullptr ? *src_hint : is_src_root (out_root))
src_root = &out_root;
else
{
path f (out_root / src_root_file);
if (!fallback_src_root.empty () && !file_exists (f))
src_root = &fallback_src_root;
else
{
auto p (extract_variable (f, "src_root"));
if (!p.second)
error << "variable 'src_root' expected as first line in " << f;
src_root_v = move (p.first);
src_root = &cast<dir_path> (src_root_v);
l5 ([&]{trace << "extracted src_root " << *src_root << " for "
<< out_root;});
}
}
string name;
{
path f (*src_root / bootstrap_file);
auto p (extract_variable (f, "project"));
if (!p.second)
error << "variable 'project' expected as first line in " << f;
name = cast<string> (move (p.first));
}
l5 ([&]{trace << "extracted project name '" << name << "' for "
<< *src_root;});
return name;
}
// Scan the specified directory for any subprojects. If a subdirectory
// is a subproject, then enter it into the map, handling the duplicates.
// Otherwise, scan the subdirectory recursively.
//
static void
find_subprojects (subprojects& sps,
const dir_path& d,
const dir_path& root,
bool out)
{
tracer trace ("find_subprojects");
for (const dir_entry& de: dir_iterator (d))
{
// If this is a link, then type() will try to stat() it. And if
// the link is dangling or points to something inaccessible, it
// will fail.
//
try
{
if (de.type () != entry_type::directory)
continue;
}
catch (const system_error& e)
{
continue;
}
dir_path sd (d / path_cast<dir_path> (de.path ()));
bool src (false);
if (!((out && is_out_root (sd)) || (src = is_src_root (sd))))
{
// We used to scan for subproject recursively but this is probably too
// loose (think of some tests laying around). In the future we should
// probably allow specifying something like extra/* or extra/** in
// subprojects.
//
//find_subprojects (sps, sd, root, out);
//
continue;
}
// Calculate relative subdirectory for this subproject.
//
dir_path dir (sd.leaf (root));
l5 ([&]{trace << "subproject " << sd << " as " << dir;});
// Load its name. Note that here we don't use fallback src_root
// since this function is used to scan both out_root and src_root.
//
string name (find_project_name (sd, dir_path (), &src));
// If the name is empty, then is is an unnamed project. While the
// 'project' variable stays empty, here we come up with a surrogate
// name for a key. The idea is that such a key should never conflict
// with a real project name. We ensure this by using the project's
// sub-directory and appending trailing '/' to it.
//
if (name.empty ())
name = dir.posix_string () + '/';
// @@ Can't use move() because we may need the values in diagnostics
// below. Looks like C++17 try_emplace() is what we need.
//
auto rp (sps.emplace (name, dir));
// Handle duplicates.
//
if (!rp.second)
{
const dir_path& dir1 (rp.first->second);
if (dir != dir1)
fail << "inconsistent subproject directories for " << name <<
info << "first alternative: " << dir1 <<
info << "second alternative: " << dir;
l6 ([&]{trace << "skipping duplicate";});
}
}
}
bool
bootstrap_src (scope& root)
{
tracer trace ("bootstrap_src");
bool r (false);
const dir_path& out_root (root.out_path ());
const dir_path& src_root (root.src_path ());
path bf (src_root / bootstrap_file);
if (file_exists (bf))
{
// We assume that bootstrap out cannot load this file explicitly. It
// feels wrong to allow this since that makes the whole bootstrap
// process hard to reason about. But we may try to bootstrap the
// same root scope multiple time.
//
if (root.buildfiles.insert (bf).second)
source (bf, root, root, true);
else
l5 ([&]{trace << "skipping already sourced " << bf;});
r = true;
}
// See if we are a part of an amalgamation. There are two key
// players: the outer root scope which may already be present
// (i.e., we were loaded as part of an amalgamation) and the
// amalgamation variable that may or may not be set by the
// user (in bootstrap.build) or by an earlier call to this
// function for the same scope. When set by the user, the
// empty special value means that the project shall not be
// amalgamated (and which we convert to NULL below). When
// calculated, the NULL value indicates that we are not
// amalgamated.
//
{
auto rp (root.vars.insert ("amalgamation")); // Set NULL by default.
value& v (rp.first);
if (v && v.empty ()) // Convert empty to NULL.
v = nullptr;
if (scope* aroot = root.parent_scope ()->root_scope ())
{
const dir_path& ad (aroot->out_path ());
dir_path rd (ad.relative (out_root));
// If we already have the amalgamation variable set, verify
// that aroot matches its value.
//
if (!rp.second)
{
if (!v)
{
fail << out_root << " cannot be amalgamated" <<
info << "amalgamated by " << ad;
}
else
{
const dir_path& vd (cast<dir_path> (v));
if (vd != rd)
{
fail << "inconsistent amalgamation of " << out_root <<
info << "specified: " << vd <<
info << "actual: " << rd << " by " << ad;
}
}
}
else
{
// Otherwise, use the outer root as our amalgamation.
//
l5 ([&]{trace << out_root << " amalgamated as " << rd;});
v = move (rd);
}
}
else if (rp.second)
{
// If there is no outer root and the amalgamation variable
// hasn't been set, then we need to check if any of the
// outer directories is a project's out_root. If so, then
// that's our amalgamation.
//
const dir_path& ad (find_out_root (out_root.directory ()));
if (!ad.empty ())
{
dir_path rd (ad.relative (out_root));
l5 ([&]{trace << out_root << " amalgamated as " << rd;});
v = move (rd);
}
}
}
// See if we have any subprojects. In a sense, this is the other
// side/direction of the amalgamation logic above. Here, the subprojects
// variable may or may not be set by the user (in bootstrap.build) or by
// an earlier call to this function for the same scope. When set by the
// user, the empty special value means that there are no subproject and
// none should be searched for (and which we convert to NULL below).
// Otherwise, it is a list of [project@]directory pairs. The directory
// must be relative to our out_root. If the project name is not specified,
// then we have to figure it out. When subprojects are calculated, the
// NULL value indicates that we found no subprojects.
//
{
const variable& var (var_pool.find ("subprojects"));
auto rp (root.vars.insert (var)); // Set NULL by default.
value& v (rp.first);
if (rp.second)
{
// No subprojects set so we need to figure out if there are any.
//
// First we are going to scan our out_root and find all the
// pre-configured subprojects. Then, if out_root != src_root,
// we are going to do the same for src_root. Here, however,
// we need to watch out for duplicates.
//
subprojects sps;
if (dir_exists (out_root))
{
l5 ([&]{trace << "looking for subprojects in " << out_root;});
find_subprojects (sps, out_root, out_root, true);
}
if (out_root != src_root)
{
l5 ([&]{trace << "looking for subprojects in " << src_root;});
find_subprojects (sps, src_root, src_root, false);
}
if (!sps.empty ()) // Keep it NULL if no subprojects.
v = move (sps);
}
else if (v)
{
// Convert empty to NULL.
//
if (v.empty ())
v = nullptr;
else
{
// Scan the (untyped) value and convert it to the "canonical" form,
// that is, a list of name@dir pairs.
//
subprojects sps;
names& ns (cast<names> (v));
for (auto i (ns.begin ()); i != ns.end (); ++i)
{
// Project name.
//
string n;
if (i->pair)
{
if (i->pair != '@')
fail << "unexpected pair style in variable subprojects";
try
{
n = convert<string> (move (*i));
if (n.empty ())
fail << "empty project name in variable subprojects";
}
catch (const invalid_argument&)
{
fail << "expected project name instead of '" << *i << "' in "
<< "variable subprojects";
}
++i; // Got to have the second half of the pair.
}
// Directory.
//
dir_path d;
try
{
d = convert<dir_path> (move (*i));
if (d.empty ())
fail << "empty directory in variable subprojects";
}
catch (const invalid_argument&)
{
fail << "expected directory instead of '" << *i << "' in "
<< "variable subprojects";
}
// Figure out the project name if the user didn't specify one.
//
if (n.empty ())
{
// Pass fallback src_root since this is a subproject that
// was specified by the user so it is most likely in our
// src.
//
n = find_project_name (out_root / d, src_root / d);
// See find_subprojects() for details on unnamed projects.
//
if (n.empty ())
n = d.posix_string () + '/';
}
sps.emplace (move (n), move (d));
}
// Change the value to the typed map.
//
v = move (sps);
}
}
}
return r;
}
bool
bootstrapped (scope& root)
{
// Use the subprojects variable set by bootstrap_src() as an indicator.
// It should either be NULL or typed (so we assume that the user will
// never set it to NULL).
//
auto l (root.vars["subprojects"]);
return l.defined () && (l->null || l->type != nullptr);
}
void
create_bootstrap_outer (scope& root)
{
auto l (root.vars["amalgamation"]);
if (!l)
return;
const dir_path& d (cast<dir_path> (l));
dir_path out_root (root.out_path () / d);
out_root.normalize (); // No need to actualize (d is a bunch of ..)
// src_root is a bit more complicated. Here we have three cases:
//
// 1. Amalgamation's src_root is "parallel" to the sub-project's.
// 2. Amalgamation's src_root is the same as its out_root.
// 3. Some other pre-configured (via src-root.build) src_root.
//
// So we need to try all these cases in some sensible order.
// #3 should probably be tried first since that src_root was
// explicitly configured by the user. After that, #2 followed
// by #1 seems reasonable.
//
scope& rs (create_root (out_root, dir_path ()));
if (!bootstrapped (rs))
{
bootstrap_out (rs); // #3 happens here, if at all.
value& v (rs.assign ("src_root"));
if (!v)
{
if (is_src_root (out_root)) // #2
v = out_root;
else // #1
{
dir_path src_root (root.src_path () / d);
src_root.normalize (); // No need to actualize (as above).
v = move (src_root);
}
}
setup_root (rs);
bootstrap_src (rs);
}
create_bootstrap_outer (rs);
// Check if we are strongly amalgamated by this outer root scope.
//
if (root.src_path ().sub (rs.src_path ()))
root.strong_ = rs.strong_scope (); // Itself or some outer scope.
}
scope&
create_bootstrap_inner (scope& root, const dir_path& out_base)
{
if (auto l = root.vars["subprojects"])
{
for (const auto& p: cast<subprojects> (l))
{
dir_path out_root (root.out_path () / p.second);
if (!out_base.sub (out_root))
continue;
// The same logic to src_root as in create_bootstrap_outer().
//
scope& rs (create_root (out_root, dir_path ()));
if (!bootstrapped (rs))
{
bootstrap_out (rs);
value& v (rs.assign ("src_root"));
if (!v)
v = is_src_root (out_root)
? out_root
: (root.src_path () / p.second);
setup_root (rs);
bootstrap_src (rs);
}
// Check if we strongly amalgamated this inner root scope.
//
if (rs.src_path ().sub (root.src_path ()))
rs.strong_ = root.strong_scope (); // Itself or some outer scope.
// See if there are more inner roots.
//
return create_bootstrap_inner (rs, out_base);
}
}
return root;
}
void
load_root_pre (scope& root)
{
tracer trace ("root_pre");
// First load outer roots, if any.
//
if (scope* rs = root.parent_scope ()->root_scope ())
load_root_pre (*rs);
// Finish off loading bootstrapped modules.
//
for (auto& p: root.modules)
{
const string& n (p.first);
module_state& s (p.second);
if (s.boot)
{
load_module (n, root, root, s.loc);
assert (!s.boot);
}
}
// Load root.build.
//
path bf (root.src_path () / root_file);
if (file_exists (bf))
source_once (bf, root, root);
}
names
import (scope& ibase, name target, const location& loc)
{
tracer trace ("import");
l5 ([&]{trace << target << " from " << ibase.out_path ();});
// If there is no project specified for this target, then our
// run will be short and sweet: we simply return it as empty-
// project-qualified and let someone else (e.g., a rule) take
// a stab at it.
//
if (target.unqualified ())
{
target.proj = &project_name_pool.find ("");
return names {move (target)};
}
// Otherwise, get the project name and convert the target to
// unqualified.
//
const string& project (*target.proj);
target.proj = nullptr;
scope& iroot (*ibase.root_scope ());
// Figure out this project's out_root.
//
dir_path out_root;
// First try the config.import.* mechanism. The idea is that if the user
// explicitly told us the project's location, then we should prefer that
// over anything that we may discover. In particular, we will prefer it
// over any bundled subprojects.
//
// Note: overridable variable with path auto-completion.
//
const variable& var (
var_pool.insert<abs_dir_path> ("config.import." + project, true));
if (auto l = iroot[var])
{
out_root = cast<dir_path> (l); // Normalized and actualized.
config::save_variable (iroot, var); // Mark as part of configuration.
// Empty config.import.* value means don't look in subprojects or
// amalgamations and go straight to the rule-specific import (e.g., to
// use system-installed).
//
if (out_root.empty ())
{
target.proj = &project;
l5 ([&]{trace << "skipping " << target;});
return names {move (target)};
}
}
else
{
// Otherwise search subprojects, starting with our root and then trying
// outer roots for as long as we are inside an amalgamation.
//
for (scope* r (&iroot);; r = r->parent_scope ()->root_scope ())
{
l5 ([&]{trace << "looking in " << r->out_path ();});
// First check the amalgamation itself.
//
if (r != &iroot && cast<string> (r->vars["project"]) == project)
{
out_root = r->out_path ();
break;
}
if (auto l = r->vars["subprojects"])
{
const auto& m (cast<subprojects> (l));
auto i (m.find (project));
if (i != m.end ())
{
const dir_path& d ((*i).second);
out_root = r->out_path () / d;
break;
}
}
if (!r->vars["amalgamation"])
break;
}
}
// If we couldn't find the project, convert it back into qualified target
// and return to let someone else (e.g., a rule) to take a stab at it.
//
if (out_root.empty ())
{
target.proj = &project;
l5 ([&]{trace << "postponing " << target;});
return names {move (target)};
}
// Bootstrap the imported root scope. This is pretty similar to what we do
// in main() except that here we don't try to guess src_root.
//
// The user can also specify the out_root of the amalgamation that contains
// our project. For now we only consider top-level sub-projects.
//
dir_path src_root;
scope* root;
for (;;)
{
src_root = is_src_root (out_root) ? out_root : dir_path ();
root = &create_root (out_root, src_root);
if (!bootstrapped (*root))
{
bootstrap_out (*root);
// Check that the bootstrap process set src_root.
//
if (auto l = root->vars["src_root"])
{
const dir_path& p (cast<dir_path> (l));
if (!src_root.empty () && p != src_root)
fail (loc) << "bootstrapped src_root " << p << " does not match "
<< "discovered " << src_root;
}
else
fail (loc) << "unable to determine src_root for imported "
<< project <<
info << "consider configuring " << out_root;
setup_root (*root);
bootstrap_src (*root);
}
else if (src_root.empty ())
src_root = root->src_path ();
// Now we know this project's name as well as all its subprojects.
//
if (cast<string> (root->vars["project"]) == project)
break;
if (auto l = root->vars["subprojects"])
{
const auto& m (cast<subprojects> (l));
auto i (m.find (project));
if (i != m.end ())
{
const dir_path& d ((*i).second);
out_root = root->out_path () / d;
continue;
}
}
fail (loc) << out_root << " is not out_root for " << project;
}
// Bootstrap outer roots if any. Loading will be done by
// load_root_pre() below.
//
create_bootstrap_outer (*root);
// Load the imported root scope.
//
load_root_pre (*root);
// Create a temporary scope so that the export stub does not mess
// up any of our variables.
//
temp_scope ts (ibase);
// "Pass" the imported project's roots to the stub.
//
ts.assign ("out_root") = move (out_root);
ts.assign ("src_root") = move (src_root);
// Also pass the target being imported.
//
{
value& v (ts.assign ("target"));
if (!target.empty ()) // Otherwise leave NULL.
v = move (target);
}
// Load the export stub. Note that it is loaded in the context
// of the importing project, not the imported one. The export
// stub will normally switch to the imported root scope at some
// point.
//
path es (root->src_path () / export_file);
try
{
ifdstream ifs (es);
l5 ([&]{trace << "importing " << es;});
// @@ Should we verify these are all unqualified names? Or maybe
// there is a use-case for the export stub to return a qualified
// name?
//
parser p;
return p.parse_export_stub (ifs, es, iroot, ts);
}
catch (const ifdstream::failure& e)
{
fail (loc) << "unable to read buildfile " << es << ": " << e.what ();
}
return names (); // Never reached.
}
target&
import (const prerequisite_key& pk)
{
assert (pk.proj != nullptr);
const string& p (*pk.proj);
// @@ We no longer have location. This is especially bad for the
// empty case, i.e., where do I need to specify the project
// name)? Looks like the only way to do this is to keep location
// in name and then in prerequisite. Perhaps one day...
//
if (!p.empty ())
fail << "unable to import target " << pk <<
info << "consider explicitly specifying its project out_root via the "
<< "config.import." << p << " command line variable";
else
fail << "unable to import target " << pk <<
info << "consider adding its installation location" <<
info << "or explicitly specifying its project name";
throw failed (); // No return.
}
}
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