Refactor auto-boot-ollama-host script into modular structure with separate configuration, network, SSH, and service management modules for improved maintainability and readability

scripts/ssh.lua

@@ -0,0 +1,69 @@
+-- SSH utilities module for auto-boot-ollama-host
+-- Provides SSH command execution functionality
+
+local utils = require("utils")
+
+local ssh_module = {}
+
+-- Execute a remote command over SSH
+-- Signature: ssh(command, user, host, port, identity_file)
+function ssh_module.execute(command, user, host, port, identity_file)
+  -- Basic validation and defaults
+  user = tostring(user or "")
+  host = tostring(host or "")
+  port = tonumber(port or 22) or 22
+  identity_file = tostring(identity_file or "")
+
+  -- Quote a string for safe single-quoted POSIX shell context
+  local function sq(s)
+    -- Replace ' with: '\''  (close, escape quote, reopen)
+    return "'" .. tostring(s):gsub("'", "'\\''") .. "'"
+  end
+
+  -- Build base ssh command (run locally)
+  -- -oBatchMode to avoid interactive prompts
+  -- -oConnectTimeout for faster failure
+  -- -oStrictHostKeyChecking uses known_hosts; adjust if needed
+  local dest = (user ~= "" and (user .. "@" .. host) or host)
+  local pieces = {
+    "ssh",
+    "-p", tostring(port),
+    "-o", "BatchMode=yes",
+    "-o", "ConnectTimeout=30",
+    "-o", "ServerAliveInterval=5",
+    "-o", "ServerAliveCountMax=1",
+    "-o", "UserKnownHostsFile=/root/.ssh/known_hosts",
+    "-o", "StrictHostKeyChecking=yes",
+  }
+  
+  if identity_file ~= "" then
+    table.insert(pieces, "-i")
+    table.insert(pieces, identity_file)
+  end
+  table.insert(pieces, dest)
+
+  -- Pass remote command as provided; caller is responsible for proper quoting
+  table.insert(pieces, "--")
+  table.insert(pieces, command)
+
+  -- Join with spaces for os.execute
+  local function join(args)
+    -- We only quote the remote command explicitly. Other args are simple tokens.
+    return table.concat(args, " ")
+  end
+
+  local full = join(pieces)
+  utils.log("SSH exec: " .. full)
+  
+  local ok, reason, code = os.execute(full)
+  if ok == true or ok == 0 then
+    utils.log("SSH command completed successfully")
+    return true
+  else
+    local msg = string.format("SSH failed: reason=%s code=%s", tostring(reason), tostring(code))
+    utils.log(msg)
+    return false, msg
+  end
+end
+
+return ssh_module