fix: expose Trojan logs and build metadata

Dockerfile

@@ -1,5 +1,6 @@
 # syntax=docker/dockerfile:1
 ARG RUNTIME_BASE=jrohy/trojan@sha256:f559fac7e9960614032e520c59405cec0e8937eca009a8169cb1d188f2b5ccb9
+ARG MANAGER_VERSION=2.0.0
 FROM node:20.11.1-bookworm AS frontend
 WORKDIR /src
 COPY trojan-web-master/package.json trojan-web-master/package-lock.json ./
@@ -13,7 +14,8 @@ COPY trojan-master/go.mod trojan-master/go.sum ./
 RUN go mod download
 COPY trojan-master/ ./
 COPY --from=frontend /src/dist ./web/templates
-RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags='-s -w' -o /out/trojan .
+ARG MANAGER_VERSION
+RUN CGO_ENABLED=0 GOOS=linux go build -trimpath -ldflags="-s -w -X trojan/trojan.MVersion=${MANAGER_VERSION} -X trojan/trojan.BuildDate=compat-image -X trojan/trojan.GoVersion=go1.21.6 -X trojan/trojan.GitVersion=local-build" -o /out/trojan .
 
 # Production builds pass an immutable, verified runtime snapshot that contains
 # the legacy Trojan core. This avoids a runtime download and preserves protocol

trojan-master/asset/trojan.service

@@ -5,7 +5,7 @@ After=network.target network-online.target nss-lookup.target mysql.service maria
 [Service]
 Type=simple
 StandardError=journal
-ExecStart=/usr/bin/trojan/trojan /usr/local/etc/trojan/config.json
+ExecStart=/bin/sh -c '/usr/bin/trojan/trojan /usr/local/etc/trojan/config.json >> /var/log/trojan.log 2>&1'
 ExecReload=/bin/kill -HUP $MAINPID
 Restart=on-failure
 RestartSec=3s

trojan-master/util/linux.go

@@ -96,7 +96,14 @@ func Log(serviceName string, line int) {
 
 // LogChan 指定服务实时日志, 返回chan
 func LogChan(serviceName, param string, closeChan chan byte) (chan string, error) {
-	cmd := exec.Command("bash", "-c", fmt.Sprintf("journalctl -f -u %s -o cat %s", serviceName, param))
+	logFile := fmt.Sprintf("/var/log/%s.log", serviceName)
+	command := fmt.Sprintf("journalctl -f -u %s -o cat %s", serviceName, param)
+	// docker-systemctl has no persistent journal. Compatibility images write
+	// service output to /var/log/<service>.log instead.
+	if IsExists(logFile) {
+		command = fmt.Sprintf("tail %s -F %s", param, logFile)
+	}
+	cmd := exec.Command("bash", "-c", command)
 
 	stdout, _ := cmd.StdoutPipe()