The Go linker (go tool link) has an option to set the value of an uninitialised string variable:
-X importpath.name=value Set the value of the string variable in importpath named name to
value.
Note that before Go 1.5 this option took two separate arguments.
Now it takes one argument split on the first = sign.
As part of your build process, you could set a version string variable using this. You can pass this through the go
tool using -ldflags
. For example, given the following source file:
package main
import "fmt"
var xyz string
func main() {
fmt.Println(xyz)
}
Then:
$ go run -ldflags "-X main.xyz=abc" main.go
abc
In order to set main.minversion
to the build date and time when building:
go build -ldflags "-X main.minversion=`date -u +.%Y%m%d.%H%M%S`" service.go
If you compile without initializing main.minversion
in this way, it will contain the empty string.