+ release.sh: add armv5 build

Close #1239

Squashed commit of the following:

commit 707e2f8e265e294c7b1328c375648f799a5ae293
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Fri Jan 10 16:32:52 2020 +0300

    leave "AdGuardHome_linux_arm" by default

commit cca01fd03200e70d6ee2201540570382f2b7fdf4
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Fri Jan 10 14:53:37 2020 +0300

    fix auto-update; update readme

commit f393a4f511861ef1998c68775bb8f234c5ce1838
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Fri Jan 10 13:00:37 2020 +0300

    + release.sh: add armv5 build; rename armv6 build

commit 73f2d20ba6b0a94a9929882fe15175ba80b528d7
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Fri Jan 10 12:59:55 2020 +0300

    * release.sh: fix indentation

Makefile

@@ -5,6 +5,7 @@ GOPATH := $(shell go env GOPATH)
 JSFILES = $(shell find client -path client/node_modules -prune -o -type f -name '*.js')
 STATIC = build/static/index.html
 CHANNEL ?= release
+GOARM_VER :=
 
 TARGET=AdGuardHome
 
@@ -23,7 +24,7 @@ $(STATIC): $(JSFILES) client/node_modules
 $(TARGET): $(STATIC) *.go home/*.go dhcpd/*.go dnsfilter/*.go dnsforward/*.go
 	GOOS=$(NATIVE_GOOS) GOARCH=$(NATIVE_GOARCH) GO111MODULE=off go get -v github.com/gobuffalo/packr/...
 	PATH=$(GOPATH)/bin:$(PATH) packr -z
-	CGO_ENABLED=0 go build -ldflags="-s -w -X main.version=$(GIT_VERSION) -X main.channel=$(CHANNEL)" -asmflags="-trimpath=$(PWD)" -gcflags="-trimpath=$(PWD)"
+	CGO_ENABLED=0 go build -ldflags="-s -w -X main.version=$(GIT_VERSION) -X main.channel=$(CHANNEL) -X main.goarm=$(GOARM_VER)" -asmflags="-trimpath=$(PWD)" -gcflags="-trimpath=$(PWD)"
 	PATH=$(GOPATH)/bin:$(PATH) packr clean
 
 clean:

README.md

@@ -170,14 +170,15 @@ or you can use the Docker image from the `edge` tag, which is synced with the re
 
 * [Docker Hub](https://hub.docker.com/r/adguard/adguardhome)
 * Beta builds
-    * [Rapsberry Pi (32-bit ARM)](https://static.adguard.com/adguardhome/beta/AdGuardHome_linux_arm.tar.gz)
+    * [Raspberry Pi (32-bit ARMv6)](https://static.adguard.com/adguardhome/beta/AdGuardHome_linux_arm.tar.gz)
     * [MacOS](https://static.adguard.com/adguardhome/beta/AdGuardHome_MacOS.zip)
     * [Windows 64-bit](https://static.adguard.com/adguardhome/beta/AdGuardHome_Windows_amd64.zip)
     * [Windows 32-bit](https://static.adguard.com/adguardhome/beta/AdGuardHome_Windows_386.zip)
     * [Linux 64-bit](https://static.adguard.com/adguardhome/beta/AdGuardHome_linux_amd64.tar.gz)
     * [Linux 32-bit](https://static.adguard.com/adguardhome/beta/AdGuardHome_linux_386.tar.gz)
     * [FreeBSD 64-bit](https://static.adguard.com/adguardhome/beta/AdGuardHome_freebsd_amd64.tar.gz)
-    * [64-bit ARM](https://static.adguard.com/adguardhome/beta/AdGuardHome_linux_arm64.tar.gz)
+    * [Linux 64-bit ARM](https://static.adguard.com/adguardhome/beta/AdGuardHome_linux_arm64.tar.gz)
+    * [Linux 32-bit ARMv5](https://static.adguard.com/adguardhome/beta/AdGuardHome_linux_armv5.tar.gz)
     * [MIPS](https://static.adguard.com/adguardhome/beta/AdGuardHome_linux_mips.tar.gz)
     * [MIPSLE](https://static.adguard.com/adguardhome/beta/AdGuardHome_linux_mipsle.tar.gz)
 

home/control_update.go

@@ -42,7 +42,11 @@ func getVersionResp(data []byte) []byte {
 		return []byte{}
 	}
 
-	_, ok := versionJSON[fmt.Sprintf("download_%s_%s", runtime.GOOS, runtime.GOARCH)]
+	dloadName := fmt.Sprintf("download_%s_%s", runtime.GOOS, runtime.GOARCH)
+	if runtime.GOARCH == "arm" && ARMVersion != "6" {
+		dloadName = fmt.Sprintf("download_%s_%sv%s", runtime.GOOS, runtime.GOARCH, ARMVersion)
+	}
+	_, ok := versionJSON[dloadName]
 	if ok && ret["new_version"] != versionString && versionString >= selfUpdateMinVersion {
 		ret["can_autoupdate"] = true
 	}

home/home.go

@@ -42,6 +42,7 @@ var (
 	versionString   string
 	updateChannel   string
 	versionCheckURL string
+	ARMVersion      string
 )
 
 const versionCheckPeriod = time.Hour * 8
@@ -64,10 +65,11 @@ type homeContext struct {
 var Context homeContext
 
 // Main is the entry point
-func Main(version string, channel string) {
+func Main(version string, channel string, armVer string) {
 	// Init update-related global variables
 	versionString = version
 	updateChannel = channel
+	ARMVersion = armVer
 	versionCheckURL = "https://static.adguard.com/adguardhome/" + updateChannel + "/version.json"
 
 	// config can be specified, which reads options from there, but other command line flags have to override config values

main.go

@@ -12,7 +12,10 @@ var version = "undefined"
 // channel can be set via ldflags
 var channel = "release"
 
+// ARM version number.  Set via linker flags.
+var goarm = ""
+
 func main() {
 	debug.SetGCPercent(10)
-	home.Main(version, channel)
+	home.Main(version, channel, goarm)
 }

release.sh

@@ -20,7 +20,11 @@ f() {
 		mkdir -p dist/AdGuardHome
 		cp -pv {AdGuardHome,LICENSE.txt,README.md} dist/AdGuardHome/
 		pushd dist
+		if [[ $GOARCH == arm ]] && [[ $GOARM != 6 ]]; then
+			tar zcvf AdGuardHome_"$GOOS"_armv"$GOARM".tar.gz AdGuardHome/
+		else
 			tar zcvf AdGuardHome_"$GOOS"_"$GOARCH".tar.gz AdGuardHome/
+		fi
 		popd
 		rm -rf dist/AdguardHome
 	fi
@@ -37,6 +41,7 @@ mkdir -p $dst
 CHANNEL=$channel GOOS=darwin GOARCH=amd64 f
 CHANNEL=$channel GOOS=linux GOARCH=amd64 f
 CHANNEL=$channel GOOS=linux GOARCH=386 GO386=387 f
+CHANNEL=$channel GOOS=linux GOARCH=arm GOARM=5 f
 CHANNEL=$channel GOOS=linux GOARCH=arm GOARM=6 f
 CHANNEL=$channel GOOS=linux GOARCH=arm64 GOARM=6 f
 CHANNEL=$channel GOOS=windows GOARCH=amd64 f
@@ -59,6 +64,7 @@ echo "  \"download_darwin_amd64\": \"$baseUrl/AdGuardHome_MacOS.zip\"," >> $dst/
 echo "  \"download_linux_amd64\": \"$baseUrl/AdGuardHome_linux_amd64.tar.gz\"," >> $dst/version.json
 echo "  \"download_linux_386\": \"$baseUrl/AdGuardHome_linux_386.tar.gz\"," >> $dst/version.json
 echo "  \"download_linux_arm\": \"$baseUrl/AdGuardHome_linux_arm.tar.gz\"," >> $dst/version.json
+echo "  \"download_linux_armv5\": \"$baseUrl/AdGuardHome_linux_armv5.tar.gz\"," >> $dst/version.json
 echo "  \"download_linux_arm64\": \"$baseUrl/AdGuardHome_linux_arm64.tar.gz\"," >> $dst/version.json
 echo "  \"download_linux_mips\": \"$baseUrl/AdGuardHome_linux_mips.tar.gz\"," >> $dst/version.json
 echo "  \"download_linux_mipsle\": \"$baseUrl/AdGuardHome_linux_mipsle.tar.gz\"," >> $dst/version.json