feat: docker download dir move to /app/Download (#398)

.github/workflows/build.yml

@@ -471,7 +471,9 @@ jobs:
           VERSION: ${{ needs.get-release.outputs.version }}
         with:
           push: ${{ github.event.inputs.test == 'true' && 'false' || 'true' }}
-          build-args: VERSION=${{ env.VERSION }}
+          build-args:
+            - VERSION=${{ env.VERSION }}
+            - IN_DOCKER=true
           platforms: |
             linux/386
             linux/amd64

Dockerfile

@@ -12,7 +12,10 @@ RUN go mod download
 COPY . .
 COPY --from=flutter /app/build/web ./cmd/web/dist
 ARG VERSION=dev
-RUN CGO_ENABLED=0 go build -tags nosqlite,web -ldflags="-s -w -X github.com/GopeedLab/gopeed/pkg/base.Version=${VERSION}" -o dist/gopeed github.com/GopeedLab/gopeed/cmd/web
+RUN CGO_ENABLED=0 go build -tags nosqlite,web -ldflags="-s -w \
+      -X github.com/GopeedLab/gopeed/pkg/base.Version=${VERSION}" \
+      -X github.com/GopeedLab/gopeed/pkg/base.InDocker=${IN_DOCKER}" \
+      -o dist/gopeed github.com/GopeedLab/gopeed/cmd/web
 
 FROM alpine:3.14.2
 LABEL maintainer="monkeyWie"

cmd/server.go

@@ -3,6 +3,7 @@ package cmd
 import (
 	_ "embed"
 	"fmt"
+	"github.com/GopeedLab/gopeed/pkg/base"
 	"github.com/GopeedLab/gopeed/pkg/rest"
 	"github.com/GopeedLab/gopeed/pkg/rest/model"
 	"net/http"
@@ -24,14 +25,20 @@ func Start(cfg *model.StartConfig) {
 		panic(err)
 	}
 	if downloadCfg.FirstLoad {
-		// Set default download dir to user download dir
-		userDir, err := os.UserHomeDir()
-		if err == nil {
-			downloadDir := filepath.Join(userDir, "Downloads")
+		// Set default download dir, in docker, it will be ${exe}/Downloads, else it will be ${user}/Downloads
+		var downloadDir string
+		if base.InDocker {
+			downloadDir = filepath.Join(filepath.Dir(cfg.StorageDir), "Downloads")
+		} else {
+			userDir, err := os.UserHomeDir()
+			if err == nil {
+				downloadDir = filepath.Join(userDir, "Downloads")
+			}
+		}
+		if downloadDir != "" {
 			downloadCfg.DownloadDir = downloadDir
 			rest.Downloader.PutConfig(downloadCfg)
 		}
-
 	}
 	fmt.Printf("Server start success on http://%s\n", listener.Addr().String())
 	if err := srv.Serve(listener); err != nil && err != http.ErrServerClosed {

pkg/base/info.go

@@ -2,6 +2,7 @@ package base
 
 // Version is the build version, set at build time, using `go build -ldflags "-X github.com/GopeedLab/gopeed/pkg/base.Version=1.0.0"`.
 var Version string
+var InDocker bool
 
 func init() {
 	if Version == "" {