fix(docker): get container id by /proc/self/mountinfo

internal/docker/container_id.go

@@ -0,0 +1,42 @@
+package docker
+
+import (
+	"bufio"
+	"os"
+	"regexp"
+	"strings"
+)
+
+// GetContainerID retrieves the Docker container ID by parsing /proc/self/mountinfo
+func GetContainerID() (string, error) {
+	// Open the mountinfo file
+	file, err := os.Open("/proc/self/mountinfo")
+	if err != nil {
+		return "", err
+	}
+	defer file.Close()
+
+	// Regular expression to extract container ID from paths like:
+	// /var/lib/docker/containers/bd4bd482f7e28566389fe7e4ce6b168e93b372c3fc18091c37923588664ca950/resolv.conf
+	containerIDPattern := regexp.MustCompile(`/var/lib/docker/containers/([a-f0-9]{64})/`)
+
+	// Scan the file line by line
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := scanner.Text()
+
+		// Look for container ID in the line
+		if strings.Contains(line, "/var/lib/docker/containers/") {
+			matches := containerIDPattern.FindStringSubmatch(line)
+			if len(matches) >= 2 {
+				return matches[1], nil
+			}
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		return "", err
+	}
+
+	return "", os.ErrNotExist
+}