build: fix --branch flag

The `--branch` flag is optional and takes a string argument.

The `--branch` flag does not make sense for `luarocks make` because
it does not fetch sources, it builds/installs based on whatever is
in the current directory.

This also adds tests that verify the behavior, but these don't
run in Travis CI because of issues running a Git daemon there.
They were verified locally.

3 files changed, 58 insertions, 7 deletions

diff --git a/spec/build_spec.lua b/spec/build_spec.lua
index 41c169d9..f0377b5f 100644
--- a/spec/build_spec.lua
+++ b/spec/build_spec.lua
@@ -4,6 +4,7 @@ local get_tmp_path = test_env.get_tmp_path
 local run = test_env.run
 local testing_paths = test_env.testing_paths
 local write_file = test_env.write_file
+local git_repo = require("spec.util.git_repo")
 
 test_env.unload_luarocks()
 local cfg = require("luarocks.core.cfg")
@@ -109,12 +110,6 @@ describe("LuaRocks build tests #integration", function()
          end, finally)
       end)
       
-      it("LuaRocks build lpeg branch=master", function()
-         -- FIXME should use dev package
-         assert.is_true(run.luarocks_bool("build --branch=master lpeg"))
-         assert.is.truthy(lfs.attributes(testing_paths.testing_sys_rocks .. "/lpeg/1.0.0-1/lpeg-1.0.0-1.rockspec"))
-      end)
-      
       it("LuaRocks build fails if the deps-mode argument is invalid", function()
          assert.is_false(run.luarocks_bool("build --deps-mode=123 " .. testing_paths.fixtures_dir .. "/a_rock-1.0-1.rockspec"))
          assert.falsy(lfs.attributes(testing_paths.testing_sys_rocks .. "/a_rock/1.0-1/a_rock-1.0-1.rockspec"))
@@ -928,5 +923,33 @@ describe("LuaRocks build tests #unit", function()
          end)
       end)
    end)
+
+   describe("#unix build from #git", function()
+      local git
+
+      setup(function()
+         git = git_repo.start()
+      end)
+      
+      teardown(function()
+         if git then
+            git:stop()
+         end
+      end)
+
+      it("using --branch", function()
+         write_file("my_branch-1.0-1.rockspec", [[
+            rockspec_format = "3.0"
+            package = "my_branch"
+            version = "1.0-1"
+            source = {
+               url = "git://localhost/testrock"
+            }
+         ]], finally)
+         assert.is_false(run.luarocks_bool("build --branch unknown-branch ./my_branch-1.0-1.rockspec"))
+         assert.is_true(run.luarocks_bool("build --branch test-branch ./my_branch-1.0-1.rockspec"))
+      end)
+   end)
+
 end)
 
diff --git a/spec/install_spec.lua b/spec/install_spec.lua
index 77ac6225..3b0b22fb 100644
--- a/spec/install_spec.lua
+++ b/spec/install_spec.lua
@@ -3,8 +3,8 @@ local lfs = require("lfs")
 local run = test_env.run
 local testing_paths = test_env.testing_paths
 local env_variables = test_env.env_variables
-local get_tmp_path = test_env.get_tmp_path
 local write_file = test_env.write_file
+local git_repo = require("spec.util.git_repo")
 
 test_env.unload_luarocks()
 
@@ -234,4 +234,31 @@ describe("luarocks install #integration", function()
       end)
    end)
 
+   describe("#unix install runs build from #git", function()
+      local git
+
+      setup(function()
+         git = git_repo.start()
+      end)
+      
+      teardown(function()
+         if git then
+            git:stop()
+         end
+      end)
+
+      it("using --branch", function()
+         write_file("my_branch-1.0-1.rockspec", [[
+            rockspec_format = "3.0"
+            package = "my_branch"
+            version = "1.0-1"
+            source = {
+               url = "git://localhost/testrock"
+            }
+         ]], finally)
+         assert.is_false(run.luarocks_bool("install --branch unknown-branch ./my_branch-1.0-1.rockspec"))
+         assert.is_true(run.luarocks_bool("install --branch test-branch ./my_branch-1.0-1.rockspec"))
+      end)
+   end)
+
 end)
diff --git a/spec/util/git_repo.lua b/spec/util/git_repo.lua
index 6cccfcc4..b3ddd9ef 100644
--- a/spec/util/git_repo.lua
+++ b/spec/util/git_repo.lua
@@ -82,6 +82,7 @@ function git_repo.start()
             test_env.execute("git add " .. name)
          end
          assert(test_env.execute("git commit -a -m 'initial commit'"))
+         assert(test_env.execute("git branch test-branch"))
          print("git daemon --reuseaddr --pid-file="..pidfile.." --base-path="..basedir.." --export-all "..repodir.." &")
          assert(test_env.execute("git daemon --reuseaddr --pid-file="..pidfile.." --base-path="..basedir.." --export-all "..repodir.." &"))
          assert(test_env.execute("sleep 0.1; netstat -ln | grep '0.0.0.0:9418 .* LISTEN'"))