From fe6aa3aa87bdff77ca667e012a9d1cc34f1fb8ea Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 24 Aug 2018 13:33:01 +0200
Subject: Implement bdep-ci command

---
 bdep/git.cxx | 163 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)

(limited to 'bdep/git.cxx')

diff --git a/bdep/git.cxx b/bdep/git.cxx
index a5e2be4..e9b1eba 100644
--- a/bdep/git.cxx
+++ b/bdep/git.cxx
@@ -85,4 +85,167 @@ namespace bdep
 
     return r;
   }
+
+  url
+  git_remote_url (const dir_path& repo,
+                  const char* opt,
+                  const char* what,
+                  const char* cfg)
+  {
+    auto git_config = [&repo] (const char* name) -> optional<string>
+    {
+      return git_line (semantic_version {2, 1, 0},
+                       repo,
+                       true /* ignore_error */,
+                       "config",
+                       "--get",
+                       name);
+    };
+
+    auto parse_url = [] (const string& s, const char* w)
+    {
+      try
+      {
+        return url (s);
+      }
+      catch (const invalid_argument& e)
+      {
+        fail << "invalid " << w << " value '" << s << "': " << e << endf;
+      }
+    };
+
+    // First try the custom config value if specified.
+    //
+    if (cfg != nullptr)
+    {
+      if (optional<string> l = git_config (cfg))
+      {
+        return parse_url (*l, cfg);
+      }
+    }
+
+    // Next is remote.origin.build2Url.
+    //
+    if (optional<string> l = git_config ("remote.origin.build2Url"))
+    {
+      return parse_url (*l, "remote.origin.build2Url");
+    }
+
+    // Finally, get remote.origin.url and try to derive an HTTPS URL from it.
+    //
+    if (optional<string> l = git_config ("remote.origin.url"))
+    {
+      string& s (*l);
+
+      // This one will be fuzzy and hairy. Here are some representative
+      // examples of what we can encounter:
+      //
+      //            example.org:/path/to/repo.git
+      //       user@example.org:/path/to/repo.git
+      //       user@example.org:~user/path/to/repo.git
+      // ssh://user@example.org/path/to/repo.git
+      //
+      // git://example.org/path/to/repo.git
+      //
+      // http://example.org/path/to/repo.git
+      // https://example.org/path/to/repo.git
+      //
+      //        /path/to/repo.git
+      // file:///path/to/repo.git
+      //
+      // Note that git seem to always make remote.origin.url absolute in
+      // case of a local filesystem path.
+      //
+      // So the algorithm will be as follows:
+      //
+      // 1. If there is scheme, then parse as URL.
+      //
+      // 2. Otherwise, check if this is an absolute path.
+      //
+      // 3. Otherwise, assume SSH <host>:<path> thing.
+      //
+      url u;
+
+      // Find the scheme.
+      //
+      // Note that in example.org:/path/... example.org is a valid scheme. To
+      // distinguish this, we check if the scheme contains any dots (none of
+      // the schemes recognized by git currently do and probably never will).
+      //
+      size_t p (s.find (':'));
+      if (p != string::npos                  && // Has ':'.
+          url::traits::find (s, p) == 0      && // Scheme starts at 0.
+          s.rfind ('.', p - 1) == string::npos) // No dots in scheme.
+      {
+        u = parse_url (s, "remote.origin.url");
+      }
+      else
+      {
+        // Absolute path or the SSH thing.
+        //
+        if (path::traits::absolute (s))
+        {
+          // This is what we want to end up with:
+          //
+          // file:///tmp
+          // file:///c:/tmp
+          //
+          const char* h (s[0] == '/' ? "file://" : "file:///");
+          u = parse_url (h + s, "remote.origin.url");
+        }
+        else if (p != string::npos)
+        {
+          // This can still include user (user@host) so let's add the scheme,
+          // replace/erase ':', and parse it as a string representation of a
+          // URL.
+          //
+          if (s[p + 1] == '/') // POSIX notation.
+            s.erase (p, 1);
+          else
+            s[p] = '/';
+
+          u = parse_url ("ssh://" + s, "remote.origin.url");
+        }
+        else
+          fail << "invalid remote.origin.url value '" << s << "': not a URL";
+      }
+
+      // A remote URL gotta have authority.
+      //
+      if (u.authority)
+      {
+        if (u.scheme == "http" || u.scheme == "https")
+        {
+          // This can still include the user which we most likely don't want.
+          //
+          u.authority->user.clear ();
+          return u;
+        }
+
+        // Derive an HTTPS URL from a remote URL (and hope for the best).
+        //
+        if (u.scheme != "file" && u.path)
+          return url ("https", u.authority->host, *u.path);
+      }
+
+      diag_record dr (fail);
+
+      dr << "unable to derive " << what << " from " << u;
+
+      dr << info << "consider setting git ";
+      if (cfg != nullptr)
+        dr << cfg << " or ";
+      dr << "remote.origin.build2Url value";
+
+      if (opt != nullptr)
+        dr << info << "or use " << opt << " to specify explicitly";
+    }
+
+    // We don't necessarily want to suggest remote.origin.build2* or the
+    // option since preferably this should be derived automatically from
+    // remote.origin.url.
+    //
+    fail << "unable to discover " << what << ": no git remote.origin.url "
+         << "value" << endf;
+  }
 }
-- 
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