Pull request: filtering: fix filter delete

Merge in DNS/adguard-home from 5700-fix-filter-delete to master

Squashed commit of the following:

commit 51e5c82
Merge: b4f8abd 37e046a
Author: Dimitry Kolyshev <[email protected]>
Date:   Thu Jun 22 17:05:23 2023 +0400

    Merge remote-tracking branch 'origin/master' into 5700-fix-filter-delete

commit b4f8abd
Merge: eac30a1 f40ef76
Author: Dimitry Kolyshev <[email protected]>
Date:   Thu Jun 22 16:55:58 2023 +0400

    Merge remote-tracking branch 'origin/master' into 5700-fix-filter-delete

commit eac30a1
Author: Dimitry Kolyshev <[email protected]>
Date:   Thu Jun 22 14:03:07 2023 +0400

    filtering: imp code

commit 4e27078
Author: Dimitry Kolyshev <[email protected]>
Date:   Thu Jun 22 14:02:04 2023 +0400

    all: docs

commit b818468
Author: Dimitry Kolyshev <[email protected]>
Date:   Thu Jun 22 13:18:12 2023 +0400

    filtering: fix filter delete

CHANGELOG.md

@@ -82,13 +82,15 @@ In this release, the schema version has changed from 20 to 21.
 
 ### Fixed
 
+- The blocklists can now be deleted properly ([#5700]).
 - Queries with the question-section target `.`, for example `NS .`, are now
   counted in the statistics and correctly shown in the query log ([#5910]).
 - Safe Search not working with `AAAA` queries for domains that don't have `AAAA`
   records ([#5913]).
 
 [#951]:  https://github.com/AdguardTeam/AdGuardHome/issues/951
 [#1577]: https://github.com/AdguardTeam/AdGuardHome/issues/1577
+[#5700]: https://github.com/AdguardTeam/AdGuardHome/issues/5700
 [#5910]: https://github.com/AdguardTeam/AdGuardHome/issues/5910
 [#5913]: https://github.com/AdguardTeam/AdGuardHome/issues/5913
 

internal/filtering/http.go

@@ -169,7 +169,7 @@ func (d *DNSFilter) handleFilteringRemoveURL(w http.ResponseWriter, r *http.Requ
 		deleted = (*filters)[delIdx]
 		p := deleted.Path(d.DataDir)
 		err = os.Rename(p, p+".old")
-		if err != nil {
+		if err != nil && !errors.Is(err, os.ErrNotExist) {
 			log.Error("deleting filter %d: renaming file %q: %s", deleted.ID, p, err)
 
 			return