Add device agent library

Provide enrollment, elevated install, posture checks, keystore, and
system-tray helpers shared by the probo-agent binary.

Signed-off-by: Ludovic Vielle <ludovic@probo.com>

pkg/deviceagent/elevate/elevate_darwin.go

@@ -0,0 +1,72 @@
+// Copyright (c) 2026 Probo Inc <hello@probo.com>.
+//
+// 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.
+
+//go:build darwin
+
+package elevate
+
+import (
+	"fmt"
+	"os/exec"
+	"strings"
+
+	"go.probo.inc/probo/pkg/deviceagent/checks"
+)
+
+func runElevatedInstall(opts InstallOptions, enrollmentToken string) error {
+	parts := []string{
+		shellQuote(opts.ExePath),
+		"install",
+		"--server",
+		shellQuote(opts.ServerURL),
+		"--enrollment-token",
+		shellQuote(enrollmentToken),
+	}
+	if opts.ConfigDir != "" {
+		parts = append(parts, "--dir", shellQuote(opts.ConfigDir))
+	}
+
+	shellCmd := strings.Join(parts, " ")
+
+	script := fmt.Sprintf(
+		`do shell script %s with administrator privileges`,
+		applescriptQuote(shellCmd),
+	)
+
+	candidates := checks.CommandCandidates("osascript")
+	if len(candidates) == 0 {
+		return fmt.Errorf("command %q not available at expected absolute path", "osascript")
+	}
+
+	out, err := exec.Command(candidates[0], "-e", script).CombinedOutput()
+
+	return commandError(out, err)
+}
+
+func shellQuote(v string) string {
+	return "'" + strings.ReplaceAll(v, "'", `'"'"'`) + "'"
+}
+
+func applescriptQuote(v string) string {
+	v = strings.ReplaceAll(v, `\`, `\\`)
+	v = strings.ReplaceAll(v, `"`, `\"`)
+
+	return `"` + v + `"`
+}