Add 'p4' (Perforce) as a dependency type

This calls the 'p4' command-line tool to checkout and sync Perforce
trees. It involves significantly more special code in Rebar than
using 'git p4', but it eliminates the indirection of
Rebar->Git->Python->Perforce

1 files changed, 47 insertions, 2 deletions

diff --git a/src/rebar_deps.erl b/src/rebar_deps.erl
index 43bde04..392882c 100644
--- a/src/rebar_deps.erl
+++ b/src/rebar_deps.erl
@@ -277,7 +277,8 @@ info_help(Description) ->
           {app_name, ".*", {svn, "svn://svn.example.org/url"}},
           {app_name, ".*", {bzr, "https://www.example.org/url", "Rev"}},
           {app_name, ".*", {fossil, "https://www.example.org/url"}},
-          {app_name, ".*", {fossil, "https://www.example.org/url", "Vsn"}}]}
+          {app_name, ".*", {fossil, "https://www.example.org/url", "Vsn"}},
+          {app_name, ".*", {p4, "//depot/subdir/app_dir"}}]}
        ]).
 
 %% Added because of trans deps,
@@ -507,6 +508,40 @@ use_source(Config, Dep, Count) ->
             use_source(Config, Dep#dep { dir = TargetDir }, Count-1)
     end.
 
+-record(p4_settings, {
+          client=undefined,
+          transport="tcp4:perforce:1666",
+          username,
+          password
+         }).
+init_p4_settings(Basename) ->
+    #p4_settings{client =
+                     case inet:gethostname() of
+                         {ok,HostName} ->
+                             HostName ++ "-"
+                                 ++ os:getenv("USER") ++ "-"
+                                 ++ Basename
+                                 ++ "-Rebar-automated-download"
+                     end}.
+
+download_source(AppDir, {p4, Url}) ->
+    download_source(AppDir, {p4, Url, "#head"});
+download_source(AppDir, {p4, Url, Rev}) ->
+    download_source(AppDir, {p4, Url, Rev, init_p4_settings(filename:basename(AppDir))});
+download_source(AppDir, {p4, Url, _Rev, Settings}) ->
+    ok = filelib:ensure_dir(AppDir),
+    rebar_utils:sh_send("p4 client -i",
+                   ?FMT("Client: ~s~n"
+                        ++"Description: generated by Rebar~n"
+                        ++"Root: ~s~n"
+                        ++"View:~n"
+                        ++"  ~s/...  //~s/...~n",
+                        [Settings#p4_settings.client,
+                         AppDir,
+                         Url,
+                         Settings#p4_settings.client]),
+                       []),
+    rebar_utils:sh(?FMT("p4 -c ~s sync -f", [Settings#p4_settings.client]), []);
 download_source(AppDir, {hg, Url, Rev}) ->
     ok = filelib:ensure_dir(AppDir),
     rebar_utils:sh(?FMT("hg clone -U ~s ~s", [Url, filename:basename(AppDir)]),
@@ -573,6 +608,8 @@ update_source(Config, Dep) ->
             Dep
     end.
 
+update_source1(AppDir, Args) when element(1, Args) =:= p4 ->
+    download_source(AppDir, Args);
 update_source1(AppDir, {git, Url}) ->
     update_source1(AppDir, {git, Url, {branch, "HEAD"}});
 update_source1(AppDir, {git, Url, ""}) ->
@@ -696,7 +733,7 @@ source_engine_avail(Source) ->
 
 source_engine_avail(Name, Source)
   when Name == hg; Name == git; Name == svn; Name == bzr; Name == rsync;
-       Name == fossil ->
+       Name == fossil; Name == p4 ->
     case vcs_client_vsn(Name) >= required_vcs_client_vsn(Name) of
         true ->
             true;
@@ -717,6 +754,7 @@ vcs_client_vsn(Path, VsnArg, VsnRegex) ->
             false
     end.
 
+required_vcs_client_vsn(p4)     -> {2013, 1};
 required_vcs_client_vsn(hg)     -> {1, 1};
 required_vcs_client_vsn(git)    -> {1, 5};
 required_vcs_client_vsn(bzr)    -> {2, 0};
@@ -724,6 +762,9 @@ required_vcs_client_vsn(svn)    -> {1, 6};
 required_vcs_client_vsn(rsync)  -> {2, 0};
 required_vcs_client_vsn(fossil) -> {1, 0}.
 
+vcs_client_vsn(p4) ->
+    vcs_client_vsn(rebar_utils:find_executable("p4"), " -V",
+                   "Rev\\. .*/(\\d+)\\.(\\d)/");
 vcs_client_vsn(hg) ->
     vcs_client_vsn(rebar_utils:find_executable("hg"), " --version",
                    "version (\\d+).(\\d+)");
@@ -743,6 +784,8 @@ vcs_client_vsn(fossil) ->
     vcs_client_vsn(rebar_utils:find_executable("fossil"), " version",
                    "version (\\d+).(\\d+)").
 
+has_vcs_dir(p4, _) ->
+    true;
 has_vcs_dir(git, Dir) ->
     filelib:is_dir(filename:join(Dir, ".git"));
 has_vcs_dir(hg, Dir) ->
@@ -760,6 +803,8 @@ has_vcs_dir(_, _) ->
 print_source(#dep{app=App, source=Source}) ->
     ?CONSOLE("~s~n", [format_source(App, Source)]).
 
+format_source(App, {p4, Url}) ->
+    format_source(App, {p4, Url, "#head"});
 format_source(App, {git, Url}) ->
     ?FMT("~p BRANCH ~s ~s", [App, "HEAD", Url]);
 format_source(App, {git, Url, ""}) ->