macOS doesn't ship with the GNU version of `date`, which
causes the command to fail if the `--rfc-3339 ns` format option
is used.
Given that we don't need the build-time with nanosecond precision,
this patch changes the format used, so that the CLI binary can be
built on the host (outside of a container);
Before this change, `make binary` would fail:
DISABLE_WARN_OUTSIDE_CONTAINER=1 make binary
WARNING: binary creates a Linux executable. Use cross for macOS or Windows.
./scripts/build/binary
make: *** [binary] Error 1
With this change, the binary can be built on the host:
DISABLE_WARN_OUTSIDE_CONTAINER=1 make binary
WARNING: binary creates a Linux executable. Use cross for macOS or Windows.
./scripts/build/binary
Building statically linked build/docker-darwin-amd64
While the previous version formatted (and parsed) the date with nanoseconds precision,
that level of precision is not actually used;
```go
func reformatDate(buildTime string) string {
t, errTime := time.Parse(time.RFC3339Nano, buildTime)
if errTime == nil {
return t.Format(time.ANSIC)
}
return buildTime
}
```
Both the old, and new input will yield the same output:
```go
fmt.Println(reformatDate("2019-12-31T13:41:44.846741804+00:00"))
// Tue Dec 31 13:41:44 2019
fmt.Println(reformatDate("2019-12-31T13:41:44Z"))
// Tue Dec 31 13:41:44 2019
```
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
ef37a8a57c