Stable and functional filter.go it manages to match a number of lines I need matched.

api.go

@@ -0,0 +1,115 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"os/exec"
+	"strings"
+)
+
+type ContainerInfo struct {
+	ID       string
+	Name     string
+	CName    string
+	Interval string
+	Ignores  []string
+}
+
+func listContainersHandler(w http.ResponseWriter, r *http.Request) {
+	containers, err := listContainers()
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Error listing containers: %v", err), http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	if err := json.NewEncoder(w).Encode(containers); err != nil {
+		http.Error(w, fmt.Sprintf("Error encoding response: %v", err), http.StatusInternalServerError)
+	}
+}
+
+func getDiffHandler(w http.ResponseWriter, r *http.Request) {
+	containerID := r.URL.Query().Get("id")
+	if containerID == "" {
+		http.Error(w, "Missing container ID", http.StatusBadRequest)
+		return
+	}
+	diffOutput, err := getDiffOutput(containerID)
+	if err != nil {
+		http.Error(w, fmt.Sprintf("Error getting diff for container %s: %v", containerID, err), http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("Content-Type", "text/plain")
+	w.Write([]byte(diffOutput))
+}
+
+func startServer() {
+	http.HandleFunc("/containers", listContainersHandler)
+	http.HandleFunc("/diff", getDiffHandler)
+
+	log.Println("Starting server on :8080")
+	if err := http.ListenAndServe(":8080", nil); err != nil {
+		log.Fatalf("Error starting server: %v", err)
+	}
+}
+
+func listContainers() ([]ContainerInfo, error) {
+	output, err := exec.Command("docker", "ps", "--format", "{{.ID}} {{.Names}} {{.Label \"oculus.enable\"}} {{.Label \"oculus.interval\"}} {{.Label \"oculus.cname\"}} {{.Label \"oculus.ignores\"}}").Output()
+	if err != nil {
+		return nil, err
+	}
+
+	lines := strings.Split(string(output), "\n")
+	var containers []ContainerInfo
+
+	for _, line := range lines {
+		if line == "" {
+			continue
+		}
+		parts := strings.Fields(line)
+		if len(parts) < 3 || parts[2] == "" {
+			continue
+		}
+
+		id := parts[0]
+		name := parts[1]
+		interval := "300s"
+		if len(parts) > 3 && parts[3] != "" {
+			interval = parts[3]
+		}
+
+		cname := name
+		if len(parts) > 4 && parts[4] != "" {
+			cname = parts[4]
+		}
+
+		ignores := []string{}
+		if len(parts) > 5 && parts[5] != "" {
+			ignores = strings.Split(parts[5], ",")
+		}
+
+		containers = append(containers, ContainerInfo{
+			ID:       id,
+			Name:     name,
+			CName:    cname,
+			Interval: interval,
+			Ignores:  ignores,
+		})
+	}
+
+	return containers, nil
+}
+
+func getDiffOutput(containerID string) (string, error) {
+	cmd := exec.Command("docker", "diff", containerID)
+	output, err := cmd.Output()
+	if err != nil {
+		return "", fmt.Errorf("docker diff failed: %w", err)
+	}
+	return string(output), nil
+}
+
+func main() {
+	startServer()
+}

build.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-ARCHITECTURES=("linux/amd64" "linux/arm64" "darwin/amd64" "darwin/arm64" "windows/amd64")
+ARCHITECTURES=("darwin/arm64" "linux/amd64" "linux/arm64" "darwin/amd64" "windows/amd64")
 PROJECT_NAME=$(basename "$(pwd)")
 
 prepare_build() {
@@ -14,19 +14,51 @@ prepare_build() {
 build_binary() {
     local os=$1
     local arch=$2
-    local output="dist/${PROJECT_NAME}_${os}_${arch}"
-    env GOOS=$os GOARCH=$arch go build -o $output . &> "build_logs/${os}_${arch}.log"
+    local output_main="dist/${os}_${arch}_main"
+    local output_filter="dist/${os}_${arch}_filter"
+    local output_api="dist/${os}_${arch}_api"
+
+    env GOOS=$os GOARCH=$arch go build -o $output_main main.go &> "build_logs/${os}_${arch}_main.log"
     if [ $? -ne 0 ]; then
-        echo "Build failed for $os/$arch" >> "build_logs/error.log"
+        echo "Build failed for $os/$arch main" >> "build_logs/error.log"
     else
-        echo "Build succeeded for $os/$arch"
+        echo "Build succeeded for $os/$arch main"
     fi
+
+    env GOOS=$os GOARCH=$arch go build -o $output_filter filter.go &> "build_logs/${os}_${arch}_filter.log"
+    if [ $? -ne 0 ]; then
+        echo "Build failed for $os/$arch filter" >> "build_logs/error.log"
+    else
+        echo "Build succeeded for $os/$arch filter"
+    fi
+
+    env GOOS=$os GOARCH=$arch go build -o $output_api api.go &> "build_logs/${os}_${arch}_api.log"
+    if [ $? -ne 0 ]; then
+        echo "Build failed for $os/$arch api" >> "build_logs/error.log"
+    else
+        echo "Build succeeded for $os/$arch api"
+    fi
+
     if [ "$os" == "linux" ]; then
-        env GOOS=$os GOARCH=$arch CGO_ENABLED=0 go build -a -ldflags '-extldflags "-static"' -o "${output}_static" . &> "build_logs/${os}_${arch}_static.log"
+        env GOOS=$os GOARCH=$arch CGO_ENABLED=0 go build -a -ldflags '-extldflags "-static"' -o "${output_main}_static" main.go &> "build_logs/${os}_${arch}_main_static.log"
         if [ $? -ne 0 ]; then
-            echo "Static build failed for $os/$arch" >> "build_logs/error.log"
+            echo "Static build failed for $os/$arch main" >> "build_logs/error.log"
         else
-            echo "Static build succeeded for $os/$arch"
+            echo "Static build succeeded for $os/$arch main"
+        fi
+
+        env GOOS=$os GOARCH=$arch CGO_ENABLED=0 go build -a -ldflags '-extldflags "-static"' -o "${output_filter}_static" filter.go &> "build_logs/${os}_${arch}_filter_static.log"
+        if [ $? -ne 0 ]; then
+            echo "Static build failed for $os/$arch filter" >> "build_logs/error.log"
+        else
+            echo "Static build succeeded for $os/$arch filter"
+        fi
+
+        env GOOS=$os GOARCH=$arch CGO_ENABLED=0 go build -a -ldflags '-extldflags "-static"' -o "${output_api}_static" api.go &> "build_logs/${os}_${arch}_api_static.log"
+        if [ $? -ne 0 ]; then
+            echo "Static build failed for $os/$arch api" >> "build_logs/error.log"
+        else
+            echo "Static build succeeded for $os/$arch api"
         fi
     fi
 }

build_logs/darwin_amd64.log

@@ -1,2 +0,0 @@
-# oculus
-./main.go:274:21: syntax error: cannot use id, container := watchedContainers.containers as value

build_logs/darwin_arm64.log

@@ -1,2 +0,0 @@
-# oculus
-./main.go:274:21: syntax error: cannot use id, container := watchedContainers.containers as value

build_logs/error.log

@@ -1,178 +0,0 @@
-Build failed for linux/amd64
-Static build failed for linux/amd64
-Build failed for linux/arm64
-Static build failed for linux/arm64
-Build failed for darwin/amd64
-Build failed for darwin/arm64
-Build failed for windows/amd64
-Build failed for linux/amd64
-Static build failed for linux/amd64
-Build failed for linux/arm64
-Static build failed for linux/arm64
-Build failed for darwin/amd64
-Build failed for darwin/arm64
-Build failed for windows/amd64
-Build failed for linux/amd64
-Static build failed for linux/amd64
-Build failed for linux/arm64
-Static build failed for linux/arm64
-Build failed for darwin/amd64
-Build failed for darwin/arm64
-Build failed for windows/amd64
-Build failed for linux/amd64
-Static build failed for linux/amd64
-Build failed for linux/arm64
-Static build failed for linux/arm64
-Build failed for darwin/amd64
-Build failed for darwin/arm64
-Build failed for windows/amd64
-Build failed for linux/amd64
-Static build failed for linux/amd64
-Build failed for linux/arm64
-Static build failed for linux/arm64
-Build failed for darwin/amd64
-Build failed for darwin/arm64
-Build failed for windows/amd64
-Build failed for linux/amd64
-Static build failed for linux/amd64
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-Static build failed for linux/arm64
-Build failed for darwin/amd64
-Build failed for darwin/arm64
-Build failed for windows/amd64
-Build failed for linux/amd64
-Static build failed for linux/amd64
-Build failed for linux/arm64
-Static build failed for linux/arm64
-Build failed for darwin/amd64
-Build failed for darwin/arm64
-Build failed for windows/amd64
-Build failed for linux/amd64
-Static build failed for linux/amd64
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-Static build failed for linux/arm64
-Build failed for darwin/amd64
-Build failed for darwin/arm64
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-Build failed for linux/amd64
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-Static build failed for linux/arm64
-Build failed for darwin/amd64
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-Build failed for windows/amd64
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-Static build failed for linux/amd64
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-Build failed for darwin/amd64
-Build failed for darwin/arm64
-Build failed for windows/amd64
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build_logs/linux_amd64.log

@@ -1,2 +0,0 @@
-# oculus
-./main.go:274:21: syntax error: cannot use id, container := watchedContainers.containers as value

build_logs/linux_amd64_static.log

@@ -1,2 +0,0 @@
-# oculus
-./main.go:274:21: syntax error: cannot use id, container := watchedContainers.containers as value

build_logs/linux_arm64.log

@@ -1,2 +0,0 @@
-# oculus
-./main.go:274:21: syntax error: cannot use id, container := watchedContainers.containers as value

build_logs/linux_arm64_static.log

@@ -1,2 +0,0 @@
-# oculus
-./main.go:274:21: syntax error: cannot use id, container := watchedContainers.containers as value

build_logs/windows_amd64.log

@@ -1,2 +0,0 @@
-# oculus
-./main.go:274:21: syntax error: cannot use id, container := watchedContainers.containers as value

diffs/my_friendly_container.diff

@@ -0,0 +1 @@
+A /newfile.txt

diffs/second_container.diff

@@ -0,0 +1,5 @@
+D /file1.txt
+A /file2.txt
+C /do/match/file3.txt
+A /dontmatch.yml
+D /dont/match.md

filter.go

@@ -0,0 +1,105 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"regexp"
+	"strings"
+)
+
+func main() {
+	if len(os.Args) < 3 {
+		log.Fatalf("Usage: %s <file> <pattern1> [<pattern2> ... <patternN>]\n", os.Args[0])
+	}
+
+	filename := os.Args[1]
+	patterns := os.Args[2:]
+
+	// Compile patterns into regular expressions
+	regexPatterns := compilePatterns(patterns)
+
+	// Read the file
+	file, err := os.Open(filename)
+	if err != nil {
+		log.Fatalf("Error opening file: %s\n", err)
+	}
+	defer file.Close()
+
+	var filteredLines []string
+	var removedCount int
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := scanner.Text()
+		fmt.Printf("Processing line: %s\n", line) // Debug print
+		if matchesAnyPattern(line, regexPatterns) {
+			fmt.Printf("Line matches pattern, removing: %s\n", line) // Debug print
+			removedCount++
+		} else {
+			filteredLines = append(filteredLines, line)
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		log.Fatalf("Error reading file: %s\n", err)
+	}
+
+	// Write the filtered lines back to the file
+	tempFile, err := os.CreateTemp("", "filtered_output")
+	if err != nil {
+		log.Fatalf("Error creating temporary file: %s\n", err)
+	}
+	defer os.Remove(tempFile.Name())
+
+	for _, line := range filteredLines {
+		_, err = tempFile.WriteString(line + "\n")
+		if err != nil {
+			log.Fatalf("Error writing to temporary file: %s\n", err)
+		}
+	}
+
+	tempFile.Close()
+
+	err = os.Rename(tempFile.Name(), filename)
+	if err != nil {
+		log.Fatalf("Error renaming temporary file: %s\n", err)
+	}
+
+	fmt.Printf("Filtered %d lines from %s\n", removedCount, filename)
+}
+
+func compilePatterns(patterns []string) []*regexp.Regexp {
+	var regexPatterns []*regexp.Regexp
+	for _, pattern := range patterns {
+		// Convert wildcard pattern to regex pattern
+		regexPattern := strings.ReplaceAll(regexp.QuoteMeta(pattern), "\\*", ".*")
+		regexPattern = strings.TrimSuffix(regexPattern, `\.`)                    // Remove trailing dot if present
+		fmt.Printf("Compiled pattern: %s to regex: %s\n", pattern, regexPattern) // Debug print
+		re, err := regexp.Compile(regexPattern)
+		if err != nil {
+			log.Fatalf("Error compiling regex pattern: %s\n", err)
+		}
+		regexPatterns = append(regexPatterns, re)
+	}
+	return regexPatterns
+}
+
+func matchesAnyPattern(line string, patterns []*regexp.Regexp) bool {
+	// Get the full path including directory
+	parts := strings.Fields(line)
+	if len(parts) < 2 {
+		return false
+	}
+	fullPath := parts[1]
+	fmt.Printf("Checking filename: %s against patterns\n", fullPath) // Debug print
+
+	for _, pattern := range patterns {
+		if pattern.MatchString(fullPath) {
+			fmt.Printf("Pattern matched: %s in filename: %s\n", pattern.String(), fullPath) // Debug print
+			return true
+		}
+	}
+	return false
+}

main.go

@@ -1,9 +1,13 @@
 package main
 
 import (
+	"bufio"
 	"crypto/md5"
+	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"log"
+	"net/http"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -15,7 +19,8 @@ import (
 type ContainerInfo struct {
 	ID       string
 	Name     string
-	Interval time.Duration
+	CName    string
+	Interval string
 	Ignores  []string
 }
 
@@ -24,10 +29,14 @@ var notifiedChanges = struct {
 	changes map[string]string
 }{changes: make(map[string]string)}
 
-var watchedContainers = struct {
-	sync.RWMutex
-	containers map[string]ContainerInfo
-}{containers: make(map[string]ContainerInfo)}
+var apiAddress string
+
+func init() {
+	apiAddress = os.Getenv("API_ADDRESS")
+	if apiAddress == "" {
+		apiAddress = "http://localhost:8080"
+	}
+}
 
 func main() {
 	// Check if GLITCHTIP_DSN environment variable is set
@@ -38,132 +47,90 @@ func main() {
 
 	log.Println("Starting Oculus...")
 
-	go monitorContainerList()
+	// Ensure the diffs directory exists
+	err := ensureDiffsDirectory()
+	if err != nil {
+		log.Fatalf("Error creating diffs directory: %v", err)
+	}
 
 	for {
-		containers, err := getContainers()
+		containers, err := fetchContainers()
 		if err != nil {
-			log.Printf("Error listing containers: %v", err)
+			log.Printf("Error fetching containers: %v", err)
 			time.Sleep(1 * time.Minute)
 			continue
 		}
 
+		var wg sync.WaitGroup
 		for _, container := range containers {
-			watchedContainers.RLock()
-			_, watched := watchedContainers.containers[container.ID]
-			watchedContainers.RUnlock()
-
-			if !watched {
-				log.Printf("Monitoring container: %s (%s) every %s", container.Name, container.ID, container.Interval)
-				watchedContainers.Lock()
-				watchedContainers.containers[container.ID] = container
-				watchedContainers.Unlock()
-				go monitorContainer(container, true)
-			}
+			wg.Add(1)
+			go func(container ContainerInfo) {
+				defer wg.Done()
+				checkAndNotify(container)
+			}(container)
 		}
+		wg.Wait()
+
+		cleanupHashes(containers)
 
 		// Sleep for 1 minute before checking for new containers again
 		time.Sleep(1 * time.Minute)
 	}
 }
 
-func getContainers() ([]ContainerInfo, error) {
-	log.Println("Fetching container list...")
-	output, err := exec.Command("docker", "ps", "--format", "{{.ID}} {{.Label \"oculus.enable\"}} {{.Label \"oculus.interval\"}} {{.Label \"oculus.cname\"}} {{.Label \"oculus.ignores\"}}").Output()
+func fetchContainers() ([]ContainerInfo, error) {
+	resp, err := http.Get(fmt.Sprintf("%s/containers", apiAddress))
 	if err != nil {
 		return nil, err
 	}
+	defer resp.Body.Close()
 
-	lines := strings.Split(string(output), "\n")
-	var containers []ContainerInfo
-
-	for _, line := range lines {
-		if line == "" {
-			continue
-		}
-		parts := strings.Fields(line)
-		if len(parts) < 2 || parts[1] == "" {
-			continue
-		}
-
-		id := parts[0]
-		intervalStr := "300s"
-		if len(parts) > 2 && parts[2] != "" {
-			intervalStr = parts[2]
-		}
-		interval, err := time.ParseDuration(intervalStr)
-		if err != nil {
-			log.Printf("Invalid interval format for container %s: %v", id, err)
-			continue
-		}
-
-		cname := id
-		if len(parts) > 3 && parts[3] != "" {
-			cname = parts[3]
-		}
-
-		ignores := []string{}
-		if len(parts) > 4 && parts[4] != "" {
-			ignores = strings.Split(parts[4], ",")
-		}
-
-		log.Printf("Container ID: %s, Name: %s, Interval: %s, Ignores: %v", id, cname, interval, ignores)
-
-		containers = append(containers, ContainerInfo{
-			ID:       id,
-			Name:     cname,
-			Interval: interval,
-			Ignores:  ignores,
-		})
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("error fetching containers: %s", resp.Status)
+	}
+
+	var containers []ContainerInfo
+	if err := json.NewDecoder(resp.Body).Decode(&containers); err != nil {
+		return nil, err
 	}
 
-	log.Printf("Found %d containers to monitor.", len(containers))
 	return containers, nil
 }
 
-func monitorContainer(container ContainerInfo, initial bool) {
-	ticker := time.NewTicker(container.Interval)
-	defer ticker.Stop()
-
-	for {
-		select {
-		case <-ticker.C:
-			log.Printf("Checking diffs for container: %s (%s)", container.Name, container.ID)
-			diffOutput, err := getDiffOutput(container.ID)
-			if err != nil {
-				log.Printf("Error getting diffs for container %s (%s): %v", container.Name, container.ID, err)
-				return
-			}
-
-			filteredOutput, err := filterDiffOutput(diffOutput, container.Ignores)
-			if err != nil {
-				log.Printf("Error filtering diffs for container %s (%s): %v", container.Name, container.ID, err)
-				return
-			}
-			log.Printf("Filtered diff output for container %s: %s", container.Name, filteredOutput)
-
-			err = handleDiffOutput(container, filteredOutput, initial)
-			if err != nil {
-				log.Printf("Error handling diff output for container %s (%s): %v", container.Name, container.ID, err)
-				return
-			}
-			initial = false
-		}
-	}
-}
-
-func getDiffOutput(containerID string) (string, error) {
-	cmd := exec.Command("docker", "diff", containerID)
-	output, err := cmd.Output()
+func fetchDiffOutput(containerID string) (string, error) {
+	resp, err := http.Get(fmt.Sprintf("%s/diff?id=%s", apiAddress, containerID))
 	if err != nil {
-		return "", fmt.Errorf("docker diff failed: %w", err)
+		return "", err
 	}
-	return string(output), nil
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return "", fmt.Errorf("error fetching diff: %s", resp.Status)
+	}
+
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return "", err
+	}
+
+	return string(body), nil
 }
 
-func handleDiffOutput(container ContainerInfo, filteredOutput string, initial bool) error {
+func checkAndNotify(container ContainerInfo) {
+	diffOutput, err := fetchDiffOutput(container.ID)
+	if err != nil {
+		log.Printf("Error getting diffs for container %s (%s): %v", container.Name, container.ID, err)
+		return
+	}
+
+	filteredOutput, err := filterDiffOutput(diffOutput, container.CName, container.Ignores)
+	if err != nil {
+		log.Printf("Error filtering diffs for container %s (%s): %v", container.Name, container.ID, err)
+		return
+	}
+	log.Printf("Filtered diff output for container %s: %s", container.Name, filteredOutput)
+
 	if filteredOutput != "" {
-		// Calculate a hash of the filtered diff output
 		diffHash := fmt.Sprintf("%x", md5.Sum([]byte(filteredOutput)))
 		log.Printf("Diff hash for container %s: %s", container.Name, diffHash)
 
@@ -171,23 +138,14 @@ func handleDiffOutput(container ContainerInfo, filteredOutput string, initial bo
 		lastNotifiedHash, notified := notifiedChanges.changes[container.ID]
 		notifiedChanges.RUnlock()
 
-		if initial {
-			// For the initial check, just store the hash and don't send a notification
-			notifiedChanges.Lock()
-			notifiedChanges.changes[container.ID] = diffHash
-			notifiedChanges.Unlock()
-			log.Printf("Initial check, storing hash for container: %s (%s)", container.Name, container.ID)
-		} else if !notified || lastNotifiedHash != diffHash {
-			log.Printf("Writing diff output for container: %s (%s)", container.Name, container.ID)
-			// Write diff output to a file
-			filename := fmt.Sprintf("%s.diff", container.Name)
+		if !notified || lastNotifiedHash != diffHash {
+			filename := filepath.Join("diffs", fmt.Sprintf("%s.diff", container.CName))
 			err := writeToFile(filename, filteredOutput)
 			if err != nil {
-				return fmt.Errorf("error writing diff to file: %w", err)
+				log.Printf("Error writing diff to file: %v", err)
+				return
 			}
 
-			// Send notification using go-glitch
-			log.Printf("Sending notification for container: %s (%s)", container.Name, container.ID)
 			err = sendNotification(filteredOutput)
 			if err != nil {
 				log.Printf("Error sending notification for container %s: %v", container.ID, err)
@@ -203,47 +161,55 @@ func handleDiffOutput(container ContainerInfo, filteredOutput string, initial bo
 	} else {
 		log.Printf("No significant changes detected for container: %s (%s)", container.Name, container.ID)
 	}
-
-	return nil
 }
 
-func filterDiffOutput(diffOutput string, ignores []string) (string, error) {
-	tempFile, err := os.CreateTemp("", "diff_output")
-	if err != nil {
-		return "", err
-	}
-	defer os.Remove(tempFile.Name())
+func filterDiffOutput(diffOutput, cname string, ignores []string) (string, error) {
+	filename := filepath.Join("diffs", fmt.Sprintf("%s.diff", cname))
 
-	_, err = tempFile.WriteString(diffOutput)
+	// Write the diff output to the file
+	err := ioutil.WriteFile(filename, []byte(diffOutput), 0644)
 	if err != nil {
-		return "", err
+		return "", fmt.Errorf("error writing diff to file: %s", err)
 	}
-	tempFile.Close()
 
-	for _, ignore := range ignores {
-		cmd := exec.Command("sed", "-i", fmt.Sprintf("/%s/d", ignore), tempFile.Name())
-		err := cmd.Run()
-		if err != nil {
-			return "", fmt.Errorf("error running sed command: %w", err)
+	// Read and filter the diff output
+	var filteredLines []string
+	file, err := os.Open(filename)
+	if err != nil {
+		return "", fmt.Errorf("error opening diff file: %s", err)
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := scanner.Text()
+		ignore := false
+		for _, pattern := range ignores {
+			match, err := filepath.Match(pattern, line)
+			if err != nil {
+				return "", fmt.Errorf("error matching pattern: %s", err)
+			}
+			if match {
+				ignore = true
+				break
+			}
+		}
+		if !ignore {
+			filteredLines = append(filteredLines, line)
 		}
 	}
 
-	filteredOutput, err := os.ReadFile(tempFile.Name())
-	if err != nil {
-		return "", err
+	if err := scanner.Err(); err != nil {
+		return "", fmt.Errorf("error reading diff file: %s", err)
 	}
 
-	return string(filteredOutput), nil
-}
-
-func matchPath(path, pattern string) bool {
-	match, err := filepath.Match(pattern, filepath.Base(path))
+	filteredOutput := strings.Join(filteredLines, "\n")
+	err = ioutil.WriteFile(filename, []byte(filteredOutput), 0644)
 	if err != nil {
-		log.Printf("Error matching pattern: %s with path: %s, error: %v", pattern, path, err)
-		return false
+		return "", fmt.Errorf("error writing filtered diff to file: %s", err)
 	}
-	log.Printf("Matching path %s with pattern %s: %v", path, pattern, match)
-	return match
+
+	return filteredOutput, nil
 }
 
 func writeToFile(filename, content string) error {
@@ -268,26 +234,22 @@ func sendNotification(content string) error {
 	return nil
 }
 
-func monitorContainerList() {
-	for {
-		watchedContainers.Lock()
-		for id, container := watchedContainers.containers {
-			if !isContainerRunning(id) {
-				log.Printf("Removing stopped container from watch list: %s (%s)", container.Name, id)
-				delete(watchedContainers.containers, id)
-			}
-		}
-		watchedContainers.Unlock()
-		time.Sleep(1 * time.Minute)
-	}
+func ensureDiffsDirectory() error {
+	return os.MkdirAll("./diffs", os.ModePerm)
 }
 
-func isContainerRunning(containerID string) bool {
-	cmd := exec.Command("docker", "inspect", "--format", "{{.State.Running}}", containerID)
-	output, err := cmd.Output()
-	if err != nil {
-		log.Printf("Error inspecting container %s: %v", containerID, err)
-		return false
+func cleanupHashes(containers []ContainerInfo) {
+	notifiedChanges.Lock()
+	defer notifiedChanges.Unlock()
+
+	activeContainers := make(map[string]bool)
+	for _, container := range containers {
+		activeContainers[container.ID] = true
+	}
+
+	for id := range notifiedChanges.changes {
+		if !activeContainers[id] {
+			delete(notifiedChanges.changes, id)
+		}
 	}
-	return strings.TrimSpace(string(output)) == "true"
 }

second_container.diff

@@ -1,3 +1,3 @@
 A /file1.txt
 A /file2.txt
-A /file3.txt
+A /file3.txt