cmd/tailscale/cli: add `remove` subcommand

Fixes #12255

Add a new subcommand to `switch` for removing a profile from the local
client. This does not delete the profile from the Tailscale account, but
removes it from the local machine. This functionality is available on
the GUI's, but not yet on the CLI.

Signed-off-by: Esteban-Bermudez <esteban@bermudezaguirre.com>

cmd/tailscale/cli/switch.go

@@ -34,6 +34,22 @@ This command is currently in alpha and may change in the future.`,
 		return fs
 	}(),
 	Exec: switchProfile,
+
+	// Add remove subcommand
+	Subcommands: []*ffcli.Command{
+		{
+			Name:       "remove",
+			ShortUsage: "tailscale switch remove <id>",
+			ShortHelp:  "Remove a Tailscale account",
+			LongHelp: `"tailscale switch remove" removes a Tailscale account from the
+local machine. This does not delete the account itself, but
+it will no longer be available for switching to. You can
+add it back by logging in again.
+
+This command is currently in alpha and may change in the future.`,
+			Exec: removeProfile,
+		},
+	},
 }
 
 func init() {
@@ -186,3 +202,49 @@ func switchProfile(ctx context.Context, args []string) error {
 		}
 	}
 }
+
+func removeProfile(ctx context.Context, args []string) error {
+	if len(args) != 1 {
+		outln("usage: tailscale switch remove NAME")
+		os.Exit(1)
+	}
+	cp, all, err := localClient.ProfileStatus(ctx)
+	if err != nil {
+		errf("Failed to remove account: %v\n", err)
+		os.Exit(1)
+	}
+
+	profID, ok := matchProfile(args[0], all)
+	if !ok {
+		errf("No profile named %q\n", args[0])
+		os.Exit(1)
+	}
+
+	if profID == cp.ID {
+		printf("Already on account %q\n", args[0])
+		os.Exit(0)
+	}
+
+	return localClient.DeleteProfile(ctx, profID)
+}
+
+func matchProfile(arg string, all []ipn.LoginProfile) (ipn.ProfileID, bool) {
+	// Allow matching by ID, Tailnet, or Account
+	// in that order.
+	for _, p := range all {
+		if p.ID == ipn.ProfileID(arg) {
+			return p.ID, true
+		}
+	}
+	for _, p := range all {
+		if p.NetworkProfile.DomainName == arg {
+			return p.ID, true
+		}
+	}
+	for _, p := range all {
+		if p.Name == arg {
+			return p.ID, true
+		}
+	}
+	return "", false
+}