use stat -c for alpine linux

README.md

@@ -101,6 +101,12 @@ We perform `unit`, `integration` and `windows` tests.
 * `integration` tests run against VMs and docker containers
 * `windows` tests that run on appveyor for windows integration tests
 
+## Mac/Linux
+
+```
+bundle exec ruby -W -Ilib:test/unit test/unit/extras/stat_test.rb
+```
+
 ## Windows
 
 ```

lib/train/extras/stat.rb

@@ -34,9 +34,8 @@ def self.stat(shell_escaped_path, backend, follow_symlink)
 
     def self.linux_stat(shell_escaped_path, backend, follow_symlink)
       lstat = follow_symlink ? ' -L' : ''
-      format = backend.os.esx? ? '-c' : '--printf'
+      format = (backend.os.esx? || backend.os[:name] == 'alpine') ? '-c' : '--printf'
       res = backend.run_command("stat#{lstat} #{shell_escaped_path} 2>/dev/null #{format} '%s\n%f\n%U\n%u\n%G\n%g\n%X\n%Y\n%C'")
-
       # ignore the exit_code: it is != 0 if selinux labels are not supported
       # on the system.
 

test/unit/extras/stat_test.rb

@@ -1,6 +1,7 @@
 # encoding: utf-8
 require 'helper'
 require 'train/extras'
+require 'train/transports/mock'
 
 describe 'stat' do
   let(:cls) { Train::Extras::Stat }
@@ -42,27 +43,22 @@
   end
 
   describe 'linux stat' do
-    let(:backend) { Minitest::Mock.new }
+    let(:backend) {
+      mock = Train::Transports::Mock.new(verbose: true).connection
+      mock.mock_os({ name: 'ubuntu', family: 'debian', release: '15.04', arch: 'x86_64' })
+      mock.commands = {
+        "stat /path 2>/dev/null --printf '%s\n%f\n%U\n%u\n%G\n%g\n%X\n%Y\n%C'" => mock.mock_command('', '', '', 0),
+        "stat /path-stat 2>/dev/null --printf '%s\n%f\n%U\n%u\n%G\n%g\n%X\n%Y\n%C'" => mock.mock_command('', "360\n43ff\nroot\n0\nrootz\n1\n1444520846\n1444522445\n?", '', 0),
+      }
+      mock
+    }
 
     it 'ignores wrong stat results' do
-      res = Minitest::Mock.new
-      os = Minitest::Mock.new
-      res.expect :stdout, ''
-      os.expect :esx?, false
-      backend.expect :os, os
-      backend.expect :run_command, res, [String]
       cls.linux_stat('/path', backend, false).must_equal({})
     end
 
     it 'reads correct stat results' do
-      res = Minitest::Mock.new
-      os = Minitest::Mock.new
-      # 43ff is 41777; linux_stat strips the 4
-      res.expect :stdout, "360\n43ff\nroot\n0\nrootz\n1\n1444520846\n1444522445\n?"
-      os.expect :esx?, false
-      backend.expect :os, os
-      backend.expect :run_command, res, [String]
-      cls.linux_stat('/path', backend, false).must_equal({
+      cls.linux_stat('/path-stat', backend, false).must_equal({
         type: :directory,
         mode: 01777,
         owner: 'root',
@@ -77,27 +73,52 @@
   end
 
   describe 'esx stat' do
-    let(:backend) { Minitest::Mock.new }
+    let(:backend) {
+      mock = Train::Transports::Mock.new(verbose: true).connection
+      mock.mock_os({ name: 'vmkernel', family: 'esx', release: '5' })
+      mock.commands = {
+        "stat /path 2>/dev/null -c '%s\n%f\n%U\n%u\n%G\n%g\n%X\n%Y\n%C'" => mock.mock_command('', '', '', 0),
+        "stat /path-stat 2>/dev/null -c '%s\n%f\n%U\n%u\n%G\n%g\n%X\n%Y\n%C'" => mock.mock_command('', "360\n43ff\nroot\n0\nrootz\n1\n1444520846\n1444522445\n?", '', 0),
+      }
+      mock
+    }
 
     it 'ignores wrong stat results' do
-      res = Minitest::Mock.new
-      os = Minitest::Mock.new
-      res.expect :stdout, ''
-      os.expect :esx?, true
-      backend.expect :os, os
-      backend.expect :run_command, res, [String]
       cls.linux_stat('/path', backend, false).must_equal({})
     end
 
     it 'reads correct stat results' do
-      res = Minitest::Mock.new
-      os = Minitest::Mock.new
-      # 43ff is 41777; linux_stat strips the 4
-      res.expect :stdout, "360\n43ff\nroot\n0\nrootz\n1\n1444520846\n1444522445\nC"
-      os.expect :esx?, true
-      backend.expect :os, os
-      backend.expect :run_command, res, [String]
-      cls.linux_stat('/path', backend, false).must_equal({
+      cls.linux_stat('/path-stat', backend, false).must_equal({
+        type: :directory,
+        mode: 01777,
+        owner: 'root',
+        uid: 0,
+        group: 'rootz',
+        gid: 1,
+        mtime: 1444522445,
+        size: 360,
+        selinux_label: nil,
+      })
+    end
+  end
+
+  describe 'alpine stat' do
+    let(:backend) {
+      mock = Train::Transports::Mock.new(verbose: true).connection
+      mock.mock_os({ name: 'alpine', family: 'alpine', release: nil })
+      mock.commands = {
+        "stat /path 2>/dev/null -c '%s\n%f\n%U\n%u\n%G\n%g\n%X\n%Y\n%C'" => mock.mock_command('', '', '', 0),
+        "stat /path-stat 2>/dev/null -c '%s\n%f\n%U\n%u\n%G\n%g\n%X\n%Y\n%C'" => mock.mock_command('', "360\n43ff\nroot\n0\nrootz\n1\n1444520846\n1444522445\n?", '', 0),
+      }
+      mock
+    }
+
+    it 'ignores wrong stat results' do
+      cls.linux_stat('/path', backend, false).must_equal({})
+    end
+
+    it 'reads correct stat results' do
+      cls.linux_stat('/path-stat', backend, false).must_equal({
         type: :directory,
         mode: 01777,
         owner: 'root',