diff --git a/.gitignore b/.gitignore
index f8564fd9..7ed45af2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,7 +12,8 @@
 /querylog.json
 /querylog.json.1
 /a_main-packr.go
+coverage.txt
 
 # Test output
 dnsfilter/tests/top-1m.csv
-dnsfilter/tests/dnsfilter.TestLotsOfRules*.pprof
\ No newline at end of file
+dnsfilter/tests/dnsfilter.TestLotsOfRules*.pprof
diff --git a/.golangci.yml b/.golangci.yml
index ee952d7b..013b9000 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -38,6 +38,9 @@ linters:
     - gochecknoinits
     - prealloc
     - maligned
+    - godox
+    - funlen
+    - whitespace
     - goconst # disabled until it's possible to configure
   fast: true
 
diff --git a/.travis.yml b/.travis.yml
index 972fabd3..dcf23a77 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,6 @@ sudo: false
 
 go:
   - 1.12.x
-  - 1.x
 os:
   - linux
   - osx
@@ -11,6 +10,7 @@ os:
 before_install:
   - nvm install node
   - npm install -g npm
+  - curl -sfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh| sh -s -- -b $(go env GOPATH)/bin v1.19.1
 
 install:
   - npm --prefix client install
@@ -22,13 +22,7 @@ cache:
     - $HOME/Library/Caches/go-build
 
 script:
-  - node -v
-  - npm -v
-  # Run tests
-  - go test -race -v -bench=. -coverprofile=coverage.txt -covermode=atomic ./...
-  # Make
-  - make build/static/index.html
-  - make
+  - /bin/bash ci.sh
 
 after_success:
   - bash <(curl -s https://codecov.io/bash)
diff --git a/ci.sh b/ci.sh
new file mode 100755
index 00000000..a747b330
--- /dev/null
+++ b/ci.sh
@@ -0,0 +1,36 @@
+#!/bin/bash
+set -e
+set -x
+
+echo "Starting AdGuard Home CI script"
+
+# Print the current directory contents
+ls -la
+
+# Check versions and current directory
+node -v
+npm -v
+go version
+golangci-lint --version
+
+# Run linter
+golangci-lint run
+
+# Run tests
+go test -race -v -bench=. -coverprofile=coverage.txt -covermode=atomic ./...
+
+# Make
+make clean
+make build/static/index.html
+make
+
+if [[ -z "$(git status --porcelain)" ]]; then
+    # Working directory clean
+    echo "Git status is clean"
+else
+    echo "Git status is not clean and contains uncommited changes"
+    echo "Please make sure there are no changes"
+    exit 1
+fi
+
+echo "AdGuard Home CI script finished successfully"
\ No newline at end of file
diff --git a/home/auth_test.go b/home/auth_test.go
index 61bf4b23..abb6dfc4 100644
--- a/home/auth_test.go
+++ b/home/auth_test.go
@@ -3,6 +3,7 @@ package home
 import (
 	"encoding/hex"
 	"os"
+	"path/filepath"
 	"testing"
 	"time"
 
@@ -10,13 +11,17 @@ import (
 )
 
 func TestAuth(t *testing.T) {
-	fn := "./sessions.db"
+	config.ourWorkingDir = "."
+	fn := filepath.Join(config.getDataDir(), "sessions.db")
+
+	_ = os.RemoveAll(config.getDataDir())
+	defer func() { _ = os.RemoveAll(config.getDataDir()) }()
+
 	users := []User{
 		User{Name: "name", PasswordHash: "$2y$05$..vyzAECIhJPfaQiOK17IukcQnqEgKJHy0iETyYqxn3YXJl8yZuo2"},
 	}
 
-	os.Remove(fn)
-	config.ourWorkingDir = "."
+	os.MkdirAll(config.getDataDir(), 0755)
 	a := InitAuth(fn, users)
 
 	assert.True(t, a.CheckSession("notfound") == -1)
diff --git a/home/config.go b/home/config.go
index e2c52302..68e5fc00 100644
--- a/home/config.go
+++ b/home/config.go
@@ -239,6 +239,11 @@ func (c *configuration) getConfigFilename() string {
 	return configFile
 }
 
+// getDataDir returns path to the directory where we store databases and filters
+func (c *configuration) getDataDir() string {
+	return filepath.Join(c.ourWorkingDir, dataDir)
+}
+
 // getLogSettings reads logging settings from the config file.
 // we do it in a separate method in order to configure logger before the actual configuration is parsed and applied.
 func getLogSettings() logSettings {
diff --git a/home/control_install.go b/home/control_install.go
index 822f0c0b..7e9e315f 100644
--- a/home/control_install.go
+++ b/home/control_install.go
@@ -7,7 +7,6 @@ import (
 	"net"
 	"net/http"
 	"os/exec"
-	"path/filepath"
 	"strconv"
 
 	"github.com/AdguardTeam/golibs/log"
@@ -236,8 +235,7 @@ func handleInstallConfigure(w http.ResponseWriter, r *http.Request) {
 	config.DNS.BindHost = newSettings.DNS.IP
 	config.DNS.Port = newSettings.DNS.Port
 
-	dnsBaseDir := filepath.Join(config.ourWorkingDir, dataDir)
-	initDNSServer(dnsBaseDir)
+	initDNSServer()
 
 	err = startDNSServer()
 	if err != nil {
@@ -263,7 +261,7 @@ func handleInstallConfigure(w http.ResponseWriter, r *http.Request) {
 	// until all requests are finished, and _we_ are inside a request right now, so it will block indefinitely
 	if restartHTTP {
 		go func() {
-			config.httpServer.Shutdown(context.TODO())
+			_ = config.httpServer.Shutdown(context.TODO())
 		}()
 	}
 
diff --git a/home/dns.go b/home/dns.go
index c9c8c003..2a08db3b 100644
--- a/home/dns.go
+++ b/home/dns.go
@@ -29,7 +29,9 @@ func onConfigModified() {
 // initDNSServer creates an instance of the dnsforward.Server
 // Please note that we must do it even if we don't start it
 // so that we had access to the query log and the stats
-func initDNSServer(baseDir string) {
+func initDNSServer() {
+	baseDir := config.getDataDir()
+
 	err := os.MkdirAll(baseDir, 0755)
 	if err != nil {
 		log.Fatalf("Cannot create DNS data dir at %s: %s", baseDir, err)
@@ -52,7 +54,7 @@ func initDNSServer(baseDir string) {
 	config.queryLog = querylog.New(conf)
 	config.dnsServer = dnsforward.NewServer(config.stats, config.queryLog)
 
-	sessFilename := filepath.Join(config.ourWorkingDir, "data/sessions.db")
+	sessFilename := filepath.Join(baseDir, "sessions.db")
 	config.auth = InitAuth(sessFilename, config.Users)
 	config.Users = nil
 
@@ -65,6 +67,7 @@ func isRunning() bool {
 	return config.dnsServer != nil && config.dnsServer.IsRunning()
 }
 
+// nolint (gocyclo)
 // Return TRUE if IP is within public Internet IP range
 func isPublicIP(ip net.IP) bool {
 	ip4 := ip.To4()
diff --git a/home/dns_test.go b/home/dns_test.go
index 67d7b3ed..52344279 100644
--- a/home/dns_test.go
+++ b/home/dns_test.go
@@ -1,12 +1,16 @@
 package home
 
 import (
+	"os"
 	"testing"
 )
 
 func TestResolveRDNS(t *testing.T) {
+	_ = os.RemoveAll(config.getDataDir())
+	defer func() { _ = os.RemoveAll(config.getDataDir()) }()
+
 	config.DNS.BindHost = "1.1.1.1"
-	initDNSServer(".")
+	initDNSServer()
 	if r := config.dnsctx.rdns.resolve("1.1.1.1"); r != "one.one.one.one" {
 		t.Errorf("resolveRDNS(): %s", r)
 	}
diff --git a/home/filter.go b/home/filter.go
index 8bf902a2..80e448ea 100644
--- a/home/filter.go
+++ b/home/filter.go
@@ -448,7 +448,7 @@ func (filter *filter) unload() {
 
 // Path to the filter contents
 func (filter *filter) Path() string {
-	return filepath.Join(config.ourWorkingDir, dataDir, filterDir, strconv.FormatInt(filter.ID, 10)+".txt")
+	return filepath.Join(config.getDataDir(), filterDir, strconv.FormatInt(filter.ID, 10)+".txt")
 }
 
 // LastTimeUpdated returns the time when the filter was last time updated
diff --git a/home/home.go b/home/home.go
index 5f2d4fc0..80f9e860 100644
--- a/home/home.go
+++ b/home/home.go
@@ -142,8 +142,7 @@ func run(args options) {
 			log.Fatal(err)
 		}
 
-		dnsBaseDir := filepath.Join(config.ourWorkingDir, dataDir)
-		initDNSServer(dnsBaseDir)
+		initDNSServer()
 
 		err = startDNSServer()
 		if err != nil {
diff --git a/querylog/querylog_file.go b/querylog/querylog_file.go
index 4f63a247..8f613012 100644
--- a/querylog/querylog_file.go
+++ b/querylog/querylog_file.go
@@ -271,7 +271,7 @@ func (r *Reader) BeginReadPrev(olderThan time.Time, count uint64) {
 	if int64(off) < maxEntrySize {
 		off = 0
 	}
-	r.fpos = uint64(off)
+	r.fpos = off
 	log.Debug("QueryLog: seek: %x", off)
 	_, err := r.f.Seek(int64(off), io.SeekStart)
 	if err != nil {
@@ -376,7 +376,7 @@ func (r *Reader) prepareRead() bool {
 		if int64(off) < maxEntrySize {
 			off = 0
 		}
-		r.fpos = uint64(off)
+		r.fpos = off
 		log.Debug("QueryLog: seek: %x", off)
 		_, err = r.f.Seek(int64(off), io.SeekStart)
 		if err != nil {