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cmd/tailscale: make cert give hints on usage failure

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Like mentioning which cert domain(s) are valid.

(cherry picked from commit 891e7986cc)
(cherry picked from commit b10a55e4ed)

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2021-09-29 14:35:00 -07:00
parent fe5162a366
commit db2e9ada10
1 changed files with 14 additions and 1 deletions
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15
cmd/tailscale/cli/cert.go
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@ -18,6 +18,7 @@
"github.com/peterbourgon/ff/v2/ffcli"
"tailscale.com/atomicfile"
"tailscale.com/client/tailscale"
"tailscale.com/ipn"
)
var certCmd = &ffcli.Command{
@ -61,7 +62,19 @@ func runCert(ctx context.Context, args []string) error {
}
if len(args) != 1 {
return fmt.Errorf("Usage: tailscale cert [flags] <domain>")
var hint bytes.Buffer
if st, err := tailscale.Status(ctx); err == nil {
if st.BackendState != ipn.Running.String() {
fmt.Fprintf(&hint, "\nTailscale is not running.\n")
} else if len(st.CertDomains) == 0 {
fmt.Fprintf(&hint, "\nHTTPS cert support is not enabled/configured for your tailnet.\n")
} else if len(st.CertDomains) == 1 {
fmt.Fprintf(&hint, "\nFor domain, use %q.\n", st.CertDomains[0])
} else {
fmt.Fprintf(&hint, "\nValid domain options: %q.\n", st.CertDomains)
}
}
return fmt.Errorf("Usage: tailscale cert [flags] <domain>%s", hint.Bytes())
}
domain := args[0]