Add initial installer script with configuration and download functionality

installer.lua

@@ -0,0 +1,94 @@
+install = {
+  title = 'Opus OS',
+  version = '1.0',
+  author = 'Kepler',
+
+  description = [[
+A user friendly operating system featuring multitasking, networking,
+and automation
+]],
+
+  license = [[
+Permission is hereby granted, free of charge,
+to any person obtaining a copy of this software and associated documentation
+files (the "Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish, distribute,
+sublicense, and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+IN THE SOFTWARE.]],
+
+  copyrightYear = 2018,
+  copyrightHolders = 'Kepler',
+
+  diskspace = 380000,
+  rebootAfter = true,
+  gitRepo = 'kepler155c/opus',
+
+  gitBranch = 'develop-1.8',
+  branches = {
+    { branch = 'develop-1.8', description = '1.8+ Unstable' },
+    { branch = 'master-1.8',  description = '1.8+ Stable'   },
+    { branch = 'master',      description = '1.7x Stable'   },
+    { branch = 'develop',     description = '1.7x Unstable' },
+  },
+
+  preCopy = function(mode)
+    if mode == 'update' then
+      fs.delete('sys')
+    end
+  end,
+
+  steps = {
+    install = {
+      'splash',
+      'license',
+      'branch',
+      'files',
+      'review',
+      'install',
+    },
+    update = {
+      'branch',
+      'review',
+      'install',
+    },
+    automatic = {
+      'install',
+    },
+    uninstall = {
+      'review',
+      'uninstall',
+    },
+  },
+}
+
+print('Downloading Installer...')
+
+local url = 'https://raw.githubusercontent.com/kepler155c/opus-installer/master/sys/apps/Installer.lua'
+local h = _G.http.get(url)
+if not h then
+  error('Failed to download installer')
+end
+
+local contents = h.readAll()
+if not contents then
+  error('Failed to download installer')
+end
+
+local fn, msg = load(contents, 'Installer.lua', nil, _ENV)
+if not fn then
+  _G.printError(msg)
+else
+  local args = { ... }
+  fn(args[1])
+end