From 995e7fd8937107892755dd0a6abf86eb825e1dac Mon Sep 17 00:00:00 2001
From: Julio Lopez <1953782+julio-lopez@users.noreply.github.com>
Date: Thu, 23 Oct 2025 17:11:38 -0700
Subject: [PATCH] refactor(general): modernize (#4903)

Applies the modernize changes for the following categories:

- mapsloop
- stringsseq
- stringscutprefix
- sortslice
---
 cli/command_acl_add.go                          |  2 +-
 cli/command_benchmark_compression.go            |  2 +-
 cli/command_blob_shards_modify.go               |  4 ++--
 cli/command_policy_set_scheduling.go            |  6 +++---
 cli/command_server_tls.go                       |  4 ++--
 fs/cachefs/cache_test.go                        |  5 ++---
 internal/blobtesting/asserts.go                 |  6 ++----
 internal/blobtesting/map.go                     |  6 ++----
 internal/blobtesting/object_locking_map.go      |  6 ++----
 internal/cache/content_cache_test.go            |  5 +----
 internal/releasable/releaseable_tracker.go      |  5 ++---
 internal/server/server.go                       |  9 +++------
 internal/server/server_mount_manager.go         |  5 ++---
 internal/testutil/serverparameters.go           | 16 ++++++++--------
 internal/testutil/tmpdir.go                     |  2 +-
 internal/uitask/uitask_counter.go               |  6 +++---
 notification/sender/webhook/webhook_sender.go   |  2 +-
 repo/blob/webdav/webdav_storage_test.go         |  5 ++---
 repo/compression/compressor_test.go             |  6 ++----
 repo/manifest/manifest_manager_test.go          |  6 ++----
 snapshot/manager.go                             |  5 ++---
 tests/end_to_end_test/auto_update_test.go       |  5 ++---
 .../end_to_end_test/repository_connect_test.go  |  4 ++--
 tests/end_to_end_test/snapshot_fail_test.go     |  9 +++------
 .../robustness/fiofilewriter/fio_filewriter.go  | 17 +++++------------
 tests/tools/fio/options.go                      |  9 +++------
 tests/tools/kopiarunner/kopia_snapshotter.go    | 12 ++++++------
 tools/gettool/gettool.go                        |  2 +-
 28 files changed, 68 insertions(+), 103 deletions(-)

diff --git a/cli/command_acl_add.go b/cli/command_acl_add.go
index df34ed7b4..6c05dc5d2 100644
--- a/cli/command_acl_add.go
+++ b/cli/command_acl_add.go
@@ -29,7 +29,7 @@ func (c *commandACLAdd) setup(svc appServices, parent commandParent) {
 func (c *commandACLAdd) run(ctx context.Context, rep repo.RepositoryWriter) error {
 	r := acl.TargetRule{}
 
-	for _, v := range strings.Split(c.target, ",") {
+	for v := range strings.SplitSeq(c.target, ",") {
 		parts := strings.SplitN(v, "=", 2) //nolint:mnd
 		if len(parts) != 2 {               //nolint:mnd
 			return errors.Errorf("invalid target labels %q, must be key=value", v)
diff --git a/cli/command_benchmark_compression.go b/cli/command_benchmark_compression.go
index ff37c1462..93a72333d 100644
--- a/cli/command_benchmark_compression.go
+++ b/cli/command_benchmark_compression.go
@@ -97,7 +97,7 @@ func (c *commandBenchmarkCompression) shouldIncludeAlgorithm(name compression.Na
 		return true
 	}
 
-	for _, a := range strings.Split(c.algorithms, ",") {
+	for a := range strings.SplitSeq(c.algorithms, ",") {
 		if strings.HasPrefix(string(name), a) {
 			return true
 		}
diff --git a/cli/command_blob_shards_modify.go b/cli/command_blob_shards_modify.go
index 970c58b9a..5012c71f6 100644
--- a/cli/command_blob_shards_modify.go
+++ b/cli/command_blob_shards_modify.go
@@ -64,9 +64,9 @@ func parseShardSpec(shards string) ([]int, error) {
 		return result, nil
 	}
 
-	parts := strings.Split(shards, ",")
+	parts := strings.SplitSeq(shards, ",")
 
-	for _, p := range parts {
+	for p := range parts {
 		if p == "" {
 			continue
 		}
diff --git a/cli/command_policy_set_scheduling.go b/cli/command_policy_set_scheduling.go
index e63e26d47..03af70ba9 100644
--- a/cli/command_policy_set_scheduling.go
+++ b/cli/command_policy_set_scheduling.go
@@ -50,7 +50,7 @@ func (c *policySchedulingFlags) setScheduleFromFlags(ctx context.Context, sp *po
 		var timesOfDay []policy.TimeOfDay
 
 		for _, tods := range c.policySetTimesOfDay {
-			for _, tod := range strings.Split(tods, ",") {
+			for tod := range strings.SplitSeq(tods, ",") {
 				if tod == inheritPolicyString {
 					timesOfDay = nil
 					break
@@ -127,8 +127,8 @@ func splitCronExpressions(expr string) []string {
 
 	var result []string
 
-	parts := strings.Split(expr, ";")
-	for _, part := range parts {
+	parts := strings.SplitSeq(expr, ";")
+	for part := range parts {
 		part = strings.TrimSpace(part)
 		if part == "" {
 			continue
diff --git a/cli/command_server_tls.go b/cli/command_server_tls.go
index ab7fb078f..6c4be5a26 100644
--- a/cli/command_server_tls.go
+++ b/cli/command_server_tls.go
@@ -47,8 +47,8 @@ func (c *commandServerStart) startServerWithOptionalTLS(ctx context.Context, htt
 
 	switch len(listeners) {
 	case 0:
-		if strings.HasPrefix(httpServer.Addr, "unix:") {
-			l, err = net.Listen("unix", strings.TrimPrefix(httpServer.Addr, "unix:"))
+		if after, ok := strings.CutPrefix(httpServer.Addr, "unix:"); ok {
+			l, err = net.Listen("unix", after)
 		} else {
 			l, err = net.Listen("tcp", httpServer.Addr)
 		}
diff --git a/fs/cachefs/cache_test.go b/fs/cachefs/cache_test.go
index cad706fe6..6f1229f6d 100644
--- a/fs/cachefs/cache_test.go
+++ b/fs/cachefs/cache_test.go
@@ -3,6 +3,7 @@
 import (
 	"context"
 	"fmt"
+	"maps"
 	"path/filepath"
 	"reflect"
 	"runtime"
@@ -135,9 +136,7 @@ func errorPrefix() string {
 
 func (cv *cacheVerifier) reset() {
 	cv.lastCallCounter = make(map[string]int)
-	for k, v := range cv.cacheSource.callCounter {
-		cv.lastCallCounter[k] = v
-	}
+	maps.Copy(cv.lastCallCounter, cv.cacheSource.callCounter)
 }
 
 type lockState struct {
diff --git a/internal/blobtesting/asserts.go b/internal/blobtesting/asserts.go
index 45fe473b0..09c88d2b3 100644
--- a/internal/blobtesting/asserts.go
+++ b/internal/blobtesting/asserts.go
@@ -4,7 +4,7 @@
 	"bytes"
 	"context"
 	"reflect"
-	"sort"
+	"slices"
 	"testing"
 	"time"
 
@@ -199,9 +199,7 @@ func AssertListResultsIDs(ctx context.Context, t *testing.T, s blob.Storage, pre
 
 func sorted(s []blob.ID) []blob.ID {
 	x := append([]blob.ID(nil), s...)
-	sort.Slice(x, func(i, j int) bool {
-		return x[i] < x[j]
-	})
+	slices.Sort(x)
 
 	return x
 }
diff --git a/internal/blobtesting/map.go b/internal/blobtesting/map.go
index db06376bd..cead45069 100644
--- a/internal/blobtesting/map.go
+++ b/internal/blobtesting/map.go
@@ -3,7 +3,7 @@
 import (
 	"bytes"
 	"context"
-	"sort"
+	"slices"
 	"strings"
 	"sync"
 	"time"
@@ -181,9 +181,7 @@ func (s *mapStorage) ListBlobs(ctx context.Context, prefix blob.ID, callback fun
 
 	s.mutex.RUnlock()
 
-	sort.Slice(keys, func(i, j int) bool {
-		return keys[i] < keys[j]
-	})
+	slices.Sort(keys)
 
 	for _, k := range keys {
 		s.mutex.RLock()
diff --git a/internal/blobtesting/object_locking_map.go b/internal/blobtesting/object_locking_map.go
index 6fbb20c34..4ac825349 100644
--- a/internal/blobtesting/object_locking_map.go
+++ b/internal/blobtesting/object_locking_map.go
@@ -3,7 +3,7 @@
 import (
 	"bytes"
 	"context"
-	"sort"
+	"slices"
 	"strings"
 	"sync"
 	"time"
@@ -237,9 +237,7 @@ func (s *objectLockingMap) ListBlobs(ctx context.Context, prefix blob.ID, callba
 
 	s.mutex.RUnlock()
 
-	sort.Slice(keys, func(i, j int) bool {
-		return keys[i] < keys[j]
-	})
+	slices.Sort(keys)
 
 	for _, k := range keys {
 		m, err := s.GetMetadata(ctx, k)
diff --git a/internal/cache/content_cache_test.go b/internal/cache/content_cache_test.go
index 0bc445983..f47ff2b93 100644
--- a/internal/cache/content_cache_test.go
+++ b/internal/cache/content_cache_test.go
@@ -4,7 +4,6 @@
 	"bytes"
 	"context"
 	"slices"
-	"sort"
 	"sync"
 	"testing"
 	"time"
@@ -345,9 +344,7 @@ func verifyStorageContentList(t *testing.T, st cache.Storage, expectedContents .
 		return nil
 	}))
 
-	sort.Slice(foundContents, func(i, j int) bool {
-		return foundContents[i] < foundContents[j]
-	})
+	slices.Sort(foundContents)
 
 	assert.Equal(t, expectedContents, foundContents, "unexpected content list")
 }
diff --git a/internal/releasable/releaseable_tracker.go b/internal/releasable/releaseable_tracker.go
index efeeb70dd..c0109c02d 100644
--- a/internal/releasable/releaseable_tracker.go
+++ b/internal/releasable/releaseable_tracker.go
@@ -4,6 +4,7 @@
 import (
 	"bytes"
 	"fmt"
+	"maps"
 	"runtime/debug"
 	"sync"
 
@@ -92,9 +93,7 @@ func (s *perKindTracker) active() map[any]string {
 	defer s.mu.Unlock()
 
 	res := map[any]string{}
-	for k, v := range s.items {
-		res[k] = v
-	}
+	maps.Copy(res, s.items)
 
 	return res
 }
diff --git a/internal/server/server.go b/internal/server/server.go
index e02c10a54..7e39d7b3e 100644
--- a/internal/server/server.go
+++ b/internal/server/server.go
@@ -8,6 +8,7 @@
 	"fmt"
 	"html"
 	"io"
+	"maps"
 	"net/http"
 	"net/url"
 	"strings"
@@ -708,9 +709,7 @@ func (s *Server) syncSourcesLocked(ctx context.Context) error {
 	// copy existing sources to a map, from which we will remove sources that are found
 	// in the repository
 	oldSourceManagers := map[snapshot.SourceInfo]*sourceManager{}
-	for k, v := range s.sourceManagers {
-		oldSourceManagers[k] = v
-	}
+	maps.Copy(oldSourceManagers, s.sourceManagers)
 
 	for src := range sources {
 		if sm, ok := oldSourceManagers[src]; ok {
@@ -1048,9 +1047,7 @@ func (s *Server) snapshotAllSourceManagers() map[snapshot.SourceInfo]*sourceMana
 
 	result := map[snapshot.SourceInfo]*sourceManager{}
 
-	for k, v := range s.sourceManagers {
-		result[k] = v
-	}
+	maps.Copy(result, s.sourceManagers)
 
 	return result
 }
diff --git a/internal/server/server_mount_manager.go b/internal/server/server_mount_manager.go
index fab60d36a..de17ea7d0 100644
--- a/internal/server/server_mount_manager.go
+++ b/internal/server/server_mount_manager.go
@@ -2,6 +2,7 @@
 
 import (
 	"context"
+	"maps"
 
 	"github.com/pkg/errors"
 
@@ -42,9 +43,7 @@ func (s *Server) listMounts() map[object.ID]mount.Controller {
 
 	result := map[object.ID]mount.Controller{}
 
-	for oid, c := range s.mounts {
-		result[oid] = c
-	}
+	maps.Copy(result, s.mounts)
 
 	return result
 }
diff --git a/internal/testutil/serverparameters.go b/internal/testutil/serverparameters.go
index 75a1d577a..66cc2ff01 100644
--- a/internal/testutil/serverparameters.go
+++ b/internal/testutil/serverparameters.go
@@ -21,21 +21,21 @@ type ServerParameters struct {
 
 // ProcessOutput processes output lines from a server that's starting up.
 func (s *ServerParameters) ProcessOutput(l string) bool {
-	if strings.HasPrefix(l, serverOutputAddress) {
-		s.BaseURL = strings.TrimPrefix(l, serverOutputAddress)
+	if after, ok := strings.CutPrefix(l, serverOutputAddress); ok {
+		s.BaseURL = after
 		return false
 	}
 
-	if strings.HasPrefix(l, serverOutputCertSHA256) {
-		s.SHA256Fingerprint = strings.TrimPrefix(l, serverOutputCertSHA256)
+	if after, ok := strings.CutPrefix(l, serverOutputCertSHA256); ok {
+		s.SHA256Fingerprint = after
 	}
 
-	if strings.HasPrefix(l, serverOutputPassword) {
-		s.Password = strings.TrimPrefix(l, serverOutputPassword)
+	if after, ok := strings.CutPrefix(l, serverOutputPassword); ok {
+		s.Password = after
 	}
 
-	if strings.HasPrefix(l, serverOutputControlPassword) {
-		s.ServerControlPassword = strings.TrimPrefix(l, serverOutputControlPassword)
+	if after, ok := strings.CutPrefix(l, serverOutputControlPassword); ok {
+		s.ServerControlPassword = after
 	}
 
 	return true
diff --git a/internal/testutil/tmpdir.go b/internal/testutil/tmpdir.go
index ca7fb5d7b..e2080ba43 100644
--- a/internal/testutil/tmpdir.go
+++ b/internal/testutil/tmpdir.go
@@ -176,7 +176,7 @@ func splitLines(s string) []string {
 	}
 
 	var result []string
-	for _, l := range strings.Split(s, "\n") {
+	for l := range strings.SplitSeq(s, "\n") {
 		result = append(result, strings.TrimRight(l, "\r"))
 	}
 
diff --git a/internal/uitask/uitask_counter.go b/internal/uitask/uitask_counter.go
index 25eb13dbd..54afedf19 100644
--- a/internal/uitask/uitask_counter.go
+++ b/internal/uitask/uitask_counter.go
@@ -1,5 +1,7 @@
 package uitask
 
+import "maps"
+
 // CounterValue describes the counter value reported by task with optional units for presentation.
 type CounterValue struct {
 	Value int64  `json:"value"`
@@ -49,9 +51,7 @@ func ErrorCounter(v int64) CounterValue {
 
 func cloneCounters(c map[string]CounterValue) map[string]CounterValue {
 	newCounters := map[string]CounterValue{}
-	for k, v := range c {
-		newCounters[k] = v
-	}
+	maps.Copy(newCounters, c)
 
 	return newCounters
 }
diff --git a/notification/sender/webhook/webhook_sender.go b/notification/sender/webhook/webhook_sender.go
index 1e860de91..6e996ebcb 100644
--- a/notification/sender/webhook/webhook_sender.go
+++ b/notification/sender/webhook/webhook_sender.go
@@ -34,7 +34,7 @@ func (p *webhookProvider) Send(ctx context.Context, msg *sender.Message) error {
 	req.Header.Set("Subject", msg.Subject)
 
 	// add extra headers from options
-	for _, l := range strings.Split(p.opt.Headers, "\n") {
+	for l := range strings.SplitSeq(p.opt.Headers, "\n") {
 		const numParts = 2
 		if parts := strings.SplitN(strings.TrimSpace(l), ":", numParts); len(parts) == numParts {
 			req.Header.Set(parts[0], strings.TrimSpace(parts[1]))
diff --git a/repo/blob/webdav/webdav_storage_test.go b/repo/blob/webdav/webdav_storage_test.go
index e9ec4e816..fa5814656 100644
--- a/repo/blob/webdav/webdav_storage_test.go
+++ b/repo/blob/webdav/webdav_storage_test.go
@@ -5,6 +5,7 @@
 	"context"
 	"fmt"
 	"io"
+	"maps"
 	"net/http"
 	"net/http/httptest"
 	"os"
@@ -136,9 +137,7 @@ func transformMissingPUTs(next http.Handler) http.HandlerFunc {
 			w.WriteHeader(http.StatusForbidden)
 		} else {
 			// Passthrough recorded response headers, status code, and body
-			for header, values := range rec.Header() {
-				w.Header()[header] = values
-			}
+			maps.Copy(w.Header(), rec.Header())
 
 			w.WriteHeader(result.StatusCode)
 			io.Copy(w, result.Body)
diff --git a/repo/compression/compressor_test.go b/repo/compression/compressor_test.go
index 60c4f4200..73cf0b54d 100644
--- a/repo/compression/compressor_test.go
+++ b/repo/compression/compressor_test.go
@@ -4,7 +4,7 @@
 	"bytes"
 	"crypto/rand"
 	"fmt"
-	"sort"
+	"slices"
 	"testing"
 
 	"github.com/kopia/kopia/internal/testutil"
@@ -98,9 +98,7 @@ func BenchmarkCompressor(b *testing.B) {
 		sortedNames = append(sortedNames, id)
 	}
 
-	sort.Slice(sortedNames, func(i, j int) bool {
-		return sortedNames[i] < sortedNames[j]
-	})
+	slices.Sort(sortedNames)
 
 	for _, id := range sortedNames {
 		comp := ByName[id]
diff --git a/repo/manifest/manifest_manager_test.go b/repo/manifest/manifest_manager_test.go
index 4bd55f638..880cb20e7 100644
--- a/repo/manifest/manifest_manager_test.go
+++ b/repo/manifest/manifest_manager_test.go
@@ -5,7 +5,7 @@
 	"encoding/json"
 	"fmt"
 	"reflect"
-	"sort"
+	"slices"
 	"strings"
 	"testing"
 	"time"
@@ -302,9 +302,7 @@ func verifyMatches(ctx context.Context, t *testing.T, mgr *Manager, labels map[s
 }
 
 func sortIDs(s []ID) {
-	sort.Slice(s, func(i, j int) bool {
-		return s[i] < s[j]
-	})
+	slices.Sort(s)
 }
 
 type contentManagerOpts struct {
diff --git a/snapshot/manager.go b/snapshot/manager.go
index a35828d28..99408d4a0 100644
--- a/snapshot/manager.go
+++ b/snapshot/manager.go
@@ -3,6 +3,7 @@
 
 import (
 	"context"
+	"maps"
 
 	"github.com/pkg/errors"
 
@@ -195,9 +196,7 @@ func ListSnapshotManifests(ctx context.Context, rep repo.Repository, src *Source
 		labels = sourceInfoToLabels(*src)
 	}
 
-	for key, value := range tags {
-		labels[key] = value
-	}
+	maps.Copy(labels, tags)
 
 	entries, err := rep.FindManifests(ctx, labels)
 	if err != nil {
diff --git a/tests/end_to_end_test/auto_update_test.go b/tests/end_to_end_test/auto_update_test.go
index 481eb1655..0f38f8303 100644
--- a/tests/end_to_end_test/auto_update_test.go
+++ b/tests/end_to_end_test/auto_update_test.go
@@ -2,6 +2,7 @@
 
 import (
 	"encoding/json"
+	"maps"
 	"os"
 	"path/filepath"
 	"testing"
@@ -46,9 +47,7 @@ func TestAutoUpdateEnableTest(t *testing.T) {
 				"repo", "create", "filesystem", "--path", e.RepoDir,
 			}, tc.extraArgs...)
 
-			for k, v := range tc.extraEnv {
-				e.Environment[k] = v
-			}
+			maps.Copy(e.Environment, tc.extraEnv)
 
 			e.RunAndExpectSuccess(t, args...)
 
diff --git a/tests/end_to_end_test/repository_connect_test.go b/tests/end_to_end_test/repository_connect_test.go
index fd54fff93..029434797 100644
--- a/tests/end_to_end_test/repository_connect_test.go
+++ b/tests/end_to_end_test/repository_connect_test.go
@@ -93,8 +93,8 @@ func TestReconnectUsingToken(t *testing.T) {
 
 	// look for output line containing the prefix - this will be our reconnect command
 	for _, l := range lines {
-		if strings.HasPrefix(l, prefix) {
-			reconnectArgs = strings.Split(strings.TrimPrefix(l, prefix), " ")
+		if after, ok := strings.CutPrefix(l, prefix); ok {
+			reconnectArgs = strings.Split(after, " ")
 		}
 	}
 
diff --git a/tests/end_to_end_test/snapshot_fail_test.go b/tests/end_to_end_test/snapshot_fail_test.go
index 3e40ce0cc..79bb58695 100644
--- a/tests/end_to_end_test/snapshot_fail_test.go
+++ b/tests/end_to_end_test/snapshot_fail_test.go
@@ -2,6 +2,7 @@
 
 import (
 	"fmt"
+	"maps"
 	"math/rand"
 	"os"
 	"path/filepath"
@@ -351,13 +352,9 @@ func() {
 			oldEnv := e.Environment
 
 			e.Environment = map[string]string{}
-			for k, v := range oldEnv {
-				e.Environment[k] = v
-			}
+			maps.Copy(e.Environment, oldEnv)
 
-			for k, v := range snapshotCreateEnv {
-				e.Environment[k] = v
-			}
+			maps.Copy(e.Environment, snapshotCreateEnv)
 
 			defer func() { e.Environment = oldEnv }()
 
diff --git a/tests/robustness/fiofilewriter/fio_filewriter.go b/tests/robustness/fiofilewriter/fio_filewriter.go
index b57122a6a..79e149e73 100644
--- a/tests/robustness/fiofilewriter/fio_filewriter.go
+++ b/tests/robustness/fiofilewriter/fio_filewriter.go
@@ -8,6 +8,7 @@
 	"context"
 	"errors"
 	"log"
+	"maps"
 	"math/rand"
 	"strconv"
 	"syscall"
@@ -147,13 +148,9 @@ func (fw *FileWriter) WriteRandomFiles(ctx context.Context, opts map[string]stri
 	log.Printf("Writing files at depth %v (fileSize: %v-%v, numFiles: %v, blockSize: %v, dedupPcnt: %v, ioLimit: %v)\n", dirDepth, minFileSizeB, maxFileSizeB, numFiles, blockSize, dedupPcnt, ioLimit)
 
 	retOpts := make(map[string]string, len(opts))
-	for k, v := range opts {
-		retOpts[k] = v
-	}
+	maps.Copy(retOpts, opts)
 
-	for k, v := range fioOpts {
-		retOpts[k] = v
-	}
+	maps.Copy(retOpts, fioOpts)
 
 	retOpts["dirDepth"] = strconv.Itoa(dirDepth)
 	retOpts["relBasePath"] = relBasePath
@@ -180,9 +177,7 @@ func (fw *FileWriter) DeleteRandomSubdirectory(ctx context.Context, opts map[str
 	log.Printf("Deleting directory at depth %v\n", dirDepth)
 
 	retOpts := make(map[string]string, len(opts))
-	for k, v := range opts {
-		retOpts[k] = v
-	}
+	maps.Copy(retOpts, opts)
 
 	retOpts["dirDepth"] = strconv.Itoa(dirDepth)
 
@@ -213,9 +208,7 @@ func (fw *FileWriter) DeleteDirectoryContents(ctx context.Context, opts map[stri
 	log.Printf("Deleting %d%% of directory contents at depth %v\n", pcnt, dirDepth)
 
 	retOpts := make(map[string]string, len(opts))
-	for k, v := range opts {
-		retOpts[k] = v
-	}
+	maps.Copy(retOpts, opts)
 
 	retOpts["dirDepth"] = strconv.Itoa(dirDepth)
 	retOpts["percent"] = strconv.Itoa(pcnt)
diff --git a/tests/tools/fio/options.go b/tests/tools/fio/options.go
index 7e987c2e0..390526904 100644
--- a/tests/tools/fio/options.go
+++ b/tests/tools/fio/options.go
@@ -2,6 +2,7 @@
 
 import (
 	"fmt"
+	"maps"
 	"path/filepath"
 	"strconv"
 )
@@ -35,13 +36,9 @@
 func (o Options) Merge(other Options) Options {
 	out := make(map[string]string, len(o)+len(other))
 
-	for k, v := range o {
-		out[k] = v
-	}
+	maps.Copy(out, o)
 
-	for k, v := range other {
-		out[k] = v
-	}
+	maps.Copy(out, other)
 
 	return out
 }
diff --git a/tests/tools/kopiarunner/kopia_snapshotter.go b/tests/tools/kopiarunner/kopia_snapshotter.go
index 6ec3de2a9..2294556b3 100644
--- a/tests/tools/kopiarunner/kopia_snapshotter.go
+++ b/tests/tools/kopiarunner/kopia_snapshotter.go
@@ -317,11 +317,11 @@ func parseSnapID(lines []string) (string, error) {
 func parseSnapshotListForSnapshotIDs(output string) []string {
 	var ret []string
 
-	lines := strings.Split(output, "\n")
-	for _, l := range lines {
-		fields := strings.Fields(l)
+	lines := strings.SplitSeq(output, "\n")
+	for l := range lines {
+		fields := strings.FieldsSeq(l)
 
-		for _, f := range fields {
+		for f := range fields {
 			spl := strings.Split(f, "manifest:")
 			if len(spl) == 2 { //nolint:mnd
 				ret = append(ret, spl[1])
@@ -335,8 +335,8 @@ func parseSnapshotListForSnapshotIDs(output string) []string {
 func parseManifestListForSnapshotIDs(output string) []string {
 	var ret []string
 
-	lines := strings.Split(output, "\n")
-	for _, l := range lines {
+	lines := strings.SplitSeq(output, "\n")
+	for l := range lines {
 		fields := strings.Fields(l)
 
 		typeFieldIdx := 5
diff --git a/tools/gettool/gettool.go b/tools/gettool/gettool.go
index 8e7f7635e..545f49e3c 100644
--- a/tools/gettool/gettool.go
+++ b/tools/gettool/gettool.go
@@ -184,7 +184,7 @@ func main() {
 
 	var errorCount int
 
-	for _, toolNameVersion := range strings.Split(*tool, ",") {
+	for toolNameVersion := range strings.SplitSeq(*tool, ",") {
 		parts := strings.Split(toolNameVersion, ":")
 
 		//nolint:mnd