panic: time: missing Location in call to Time.In

傷城~ 2022-11-05 14:56 272阅读 0赞

## 起因 ##

在处理与时间验证相关的代码时，特意指定了time的location， 在本地运行通过，放到某个docker容器中直接报：panic: time: missing Location in call to Time.In错误

## 分析 ##

主要代码  
省去业务相关代码，只保留最关键的一个

loc, _ := time.LoadLocation("Asia/Chongqing")
    return time.Now().In(loc)

官方文档  
// LoadLocation returns the Location with the given name.  
//  
// If the name is “” or “UTC”, LoadLocation returns UTC.  
// If the name is “Local”, LoadLocation returns Local.  
//  
// Otherwise, the name is taken to be a location name corresponding to a file  
// in the IANA Time Zone database, such as “America/New\_York”.  
//  
// The time zone database needed by LoadLocation may not be  
// present on all systems, especially non-Unix systems.  
// LoadLocation looks in the directory or uncompressed zip file  
// named by the ZONEINFO environment variable, if any, then looks in  
// known installation locations on Unix systems,  
// and finally looks in $GOROOT/lib/time/zoneinfo.zip.

时间的位置信息是从本地文件系统中提取的，大多数系统都支持它，但还是取决于当前系统。具体的配置存储路径：

$ cd /usr/share/zoneinfo

进入该目录就可以看到各时区的配置信息

## 解决办法 ##

1.  在base 容器中添加上相关时区信息  
    示例 Dockerfile

FROM golang:1.12-alpine as build_base
    RUN apk add --update bash make git
    WORKDIR /go/src/github.com/your_repo/your_app/
    ENv GO111MODULE on
    COPY go.mod .
    COPY go.sum .
    RUN go mod download
    
    FROM build_bash AS server_builder
    COPY . ./
    RUN GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -o /go/bin/your_app
    
    FROM alpine
    RUN apk add tzdata
    
    # 自定义运行阶段的命令

最主要的就是增加了RUN apk add tzdata 这条命令