From ddf7425d65dcaa28ed6ef7c7a9e71c96f178249a Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Mon, 7 Feb 2022 20:45:15 +0300
Subject: Create package skeleton filesystem state

---
 bpkg/package-skeleton.cxx | 163 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 bpkg/package-skeleton.cxx

(limited to 'bpkg/package-skeleton.cxx')

diff --git a/bpkg/package-skeleton.cxx b/bpkg/package-skeleton.cxx
new file mode 100644
index 0000000..ebcc044
--- /dev/null
+++ b/bpkg/package-skeleton.cxx
@@ -0,0 +1,163 @@
+// file      : bpkg/package-skeleton.cxx -*- C++ -*-
+// license   : MIT; see accompanying LICENSE file
+
+#include <bpkg/package-skeleton.hxx>
+
+#include <libbutl/manifest-serializer.hxx>
+
+#include <bpkg/package.hxx>
+#include <bpkg/database.hxx>
+#include <bpkg/manifest-utility.hxx>
+
+using namespace std;
+using namespace butl;
+
+namespace bpkg
+{
+  package_skeleton::
+  package_skeleton (database& db,
+                    const available_package& ap,
+                    const strings& cvs,
+                    optional<dir_path> src_root)
+      : db_ (db),
+        available_ (ap),
+        config_vars_ (cvs),
+        src_root_ (move (src_root))
+  {
+    // Should not be created for stubs.
+    //
+    assert (available_.get ().bootstrap_build);
+
+    if (src_root_)
+      out_root_ = dir_path (db_.get ().config_orig) /= name ().string ();
+  }
+
+  void package_skeleton::
+  load ()
+  {
+    if (loaded_ && !dirty_)
+      return;
+
+    const available_package& ap (available_);
+
+    // The overall plan is as follows:
+    //
+    // 0. Create filesystem state if necessary (could have been created by
+    //    another instance, e.g., during simulation).
+    //
+    // 1. If loaded but dirty, save the accumulated reflect state, and
+    //    destroy the old state.
+    //
+    // 2. Load the state potentially with accumulated reflect state.
+
+    // Create the skeleton filesystem state, if it doesn't exist yet.
+    //
+    // Note that we create the skeleton directories in the skeletons/
+    // subdirectory of the configuration temporary directory to make sure they
+    // never clash with other temporary subdirectories (git repositories, etc).
+    //
+    if (!src_root_)
+    {
+      auto i (temp_dir.find (db_.get ().config_orig));
+      assert (i != temp_dir.end ());
+
+      dir_path d (i->second);
+      d /= "skeletons";
+      d /= name ().string () + '-' + ap.version.string ();
+
+      src_root_ = d;
+      out_root_ = move (d);
+    }
+
+    if (!exists (*src_root_))
+    {
+      // Create the buildfiles.
+      //
+      // Note that it's probably doesn't matter which naming scheme to use for
+      // the buildfiles, unless in the future we allow specifying additional
+      // files.
+      //
+      {
+        path bf (*src_root_ / std_bootstrap_file);
+
+        mk_p (bf.directory ());
+
+        // Save the {bootstrap,root}.build files.
+        //
+        auto save = [] (const string& s, const path& f)
+        {
+          try
+          {
+            ofdstream os (f);
+            os << s;
+            os.close ();
+          }
+          catch (const io_error& e)
+          {
+            fail << "unable to write to " << f << ": " << e;
+          }
+        };
+
+        save (*ap.bootstrap_build, bf);
+
+        if (ap.root_build)
+          save (*ap.root_build, *src_root_ / std_root_file);
+      }
+
+      // Create the manifest file containing the bare minimum of values
+      // which can potentially be required to load the build system state.
+      //
+      {
+        package_manifest m;
+        m.name = name ();
+        m.version = ap.version;
+
+        // Note that there is no guarantee that the potential build2
+        // constraint has already been verified. Thus, we also serialize the
+        // depends value, delegating the constraint verification to the
+        // version module. Also note that normally the toolchain build-time
+        // dependencies are specified first and, if that's the case, their
+        // constraints are already verified at this point and so build2 will
+        // not fail due to the constraint violation.
+        //
+        // Also note that the resulting file is not quite a valid package
+        // manifest, since it doesn't contain all the required values
+        // (summary, etc). It, however, is good enough for build2 which
+        // doesn't perform exhaustive manifest validation.
+        //
+        m.dependencies.reserve (ap.dependencies.size ());
+        for (const dependency_alternatives_ex& das: ap.dependencies)
+        {
+          // Skip the the special (inverse) test dependencies.
+          //
+          if (!das.type)
+            m.dependencies.push_back (das);
+        }
+
+        path mf (*src_root_ / manifest_file);
+
+        try
+        {
+          ofdstream os (mf);
+          manifest_serializer s (os, mf.string ());
+          m.serialize (s);
+          os.close ();
+        }
+        catch (const manifest_serialization&)
+        {
+          // We shouldn't be creating a non-serializable manifest, since it's
+          // crafted from the parsed values.
+          //
+          assert (false);
+        }
+        catch (const io_error& e)
+        {
+          fail << "unable to write to " << mf << ": " << e;
+        }
+      }
+    }
+
+    loaded_ = true;
+    dirty_ = false;
+  }
+}
-- 
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