Pull request: all: fix race, imp scripts

Merge in DNS/adguard-home from fix-race to master

Squashed commit of the following:

commit dff47c707554f689cf131e0ab3fe05df4e4b6a51
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri May 21 19:12:06 2021 +0300

    all: fix race, imp scripts

internal/aghnet/etchostscontainer.go

@@ -121,7 +121,9 @@ func (ehc *EtcHostsContainer) Close() {
 	if ehc.watcher != nil {
 		_ = ehc.watcher.Close()
 	}
-	close(ehc.onlyWritesChan)
+
+	// Don't close onlyWritesChan here and let onlyWrites close it after
+	// watcher.Events is closed to prevent close races.
 }
 
 // Process returns the list of IP addresses for the hostname or nil if nothing
@@ -298,6 +300,8 @@ func (ehc *EtcHostsContainer) onlyWrites() {
 			ehc.onlyWritesChan <- event
 		}
 	}
+
+	close(ehc.onlyWritesChan)
 }
 
 // Receive notifications from fsnotify package

scripts/make/build-docker.sh

@@ -27,8 +27,6 @@ else
 fi
 readonly version
 
-echo $version
-
 # Allow users to use sudo.
 sudo_cmd="${SUDO:-}"
 readonly sudo_cmd

scripts/make/clean.sh

@@ -11,9 +11,8 @@ fi
 set -e -f -u
 
 dist_dir="$DIST_DIR"
-go="${GO:-go}"
 sudo_cmd="${SUDO:-}"
-readonly dist_dir go sudo_cmd
+readonly dist_dir sudo_cmd
 
 $sudo_cmd rm -f\
 	./AdGuardHome\

scripts/make/go-lint.sh

@@ -136,7 +136,7 @@ exit_on_output() (
 	then
 		if [ "$*" != '' ]
 		then
-			echo "combined output of '$cmd $@':"
+			echo "combined output of '$cmd $*':"
 		else
 			echo "combined output of '$cmd':"
 		fi