On Wed, Aug 09, 2017 at 03:11:48PM +0200, Michael Banzon wrote:
> Is there a way to have a (bash) script check if the version of the Go
> compiler installed is a specific minimum version?
In the light of [1], I think you could combine checking of the presense
of the `go` tool itself with build tags.
Say, something like this (untested):
---------------->8----------------
set -eu
rc=0
go version >/dev/null || rc=$?
if [ $rc -ne 0 ]; then
echo "The 'go' tool is not available" >&2
exit 2
fi
d=`mktemp -d`
f=`mktemp`
trap "rm -rf '$d' '$f'" EXIT INT TERM QUIT
cd "$d"
cat >false.go <<'EOF'
// +build !go1.7
package main
import "os"
func main() {
os.Exit(1)
}
EOF
cat >true.go <<'EOF'
// +build go1.7
package main
import "os"
func main() {
os.Exit(0)
}
EOF
go build -o "$f" "$d/*.go"
rc=0
"$f" || rc=1
if [ $rc -ne 0 ]; then
echo "Insufficient Go version" >&2
exit 2
fi
exit 0
---------------->8----------------
One possible caveat is that `mktemp` by default creates its filesystem
entries under $TMPDIR or /tmp, and that directory might be mounted with
"noexec" on certain systems. So if your setup script (or whatever it
is) has a luxury of using its own scratch space, you should probably do
that (like creating a temp. directory using `mktemp -f ~/.cache/XXXXXX`
or something like this).
1. https://github.com/golang/go/issues/21207
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