[f2f]

minor factual adjustment: "go get" doesn't update a package once it's been downloaded. you need to force it.

"there is no guarantee that a build will be the same from day to day" is simply not true.

[dbaupp]

Oh, indeed. I must've got mixed up: it doesn't guarantee that builds will the same from machine to machine (unless you run go get at the exact same instant).

[dschiptsov]

So, in Golang there is no concept of package version?

For them different location (to import from) for an incompatible version is good-enough.

[f2f]

go get is just a mechanism, not the tool. there are other tools build on top of go get that ensure proper versioning.