转到构建标签-在Windows上获取时间戳

Question

I have seen the following command to set build version

go build -ldflags "-X main.minversion `date -u +.%Y%m%d%.H%M%S`" service.go

but I cant get the timestamp part to work on Windows !

I am using go 1.5 with the following arguments...

build -i -ldflags "-X main.SERVER_NAME=MFFP -X main.VERSION=1.0.0 -X main.BUILD_DATE=`date -u +.%Y%m%d%.H%M%S`"

The error is with the date part

Is this error system related? Anyone tried this on Windows?

Thanks!

Answer 1

The command on *nix systems is using backtick command substitution. date is a built-in on POSIX, and anything inside `s is interpreted as a shell command and is replaced by its value.

cmd.exe doesn't do command substitution inside backticks at all, There's some ways to accomplish the same thing using for /F delims="", aka the most powerful command in Windows shell, but it's pretty hacky. Maybe use powershell instead, which supports the $(command) syntax?

PS C:\users\adsmith> go build -i -ldflags "-X main.SERVER_NAME=MFFP -X main.VERSION=1.0.0 -X main.BUILD_DATE=$(Get-Date -uformat .%Y%m%d%.H%M%S)"

You might have to play with the format -- I'm not sure what that's supposed to look like on POSIX. This outputs:

.20160107.111641
// Jan 7th 2016, 11:16:41