Add fill command to overwrite SD card

CHANGELOG.md

@@ -18,6 +18,7 @@ Unreleased
 - Bumped `structopt` dependency to `0.3.17`
 - Added the `fill` command that fills the SD card of a Nitrokey Storage device
   with random data
+  - Added the `crossterm` dependency in version `0.17.8`
 
 
 0.3.4

Cargo.toml

@@ -38,6 +38,9 @@ version = "1.0"
 [dependencies.base32]
 version = "0.4.0"
 
+[dependencies.crossterm]
+version = "0.17.8"
+
 [dependencies.envy]
 version = "0.4.1"
 

src/main.rs

@@ -98,6 +98,8 @@ pub struct Context<'io> {
   pub stdout: &'io mut dyn io::Write,
   /// The `Write` object used as standard error throughout the program.
   pub stderr: &'io mut dyn io::Write,
+  /// Whether `stdout` is a TTY.
+  pub is_tty: bool,
   /// The admin PIN, if provided through an environment variable.
   pub admin_pin: Option<ffi::OsString>,
   /// The user PIN, if provided through an environment variable.
@@ -118,14 +120,20 @@ pub struct Context<'io> {
 }
 
 impl<'io> Context<'io> {
-  fn from_env<O, E>(stdout: &'io mut O, stderr: &'io mut E, config: config::Config) -> Context<'io>
+  fn from_env<O, E>(
+    stdout: &'io mut O,
+    stderr: &'io mut E,
+    is_tty: bool,
+    config: config::Config,
+  ) -> Context<'io>
   where
     O: io::Write,
     E: io::Write,
   {
     Context {
       stdout,
       stderr,
+      is_tty,
       admin_pin: env::var_os(NITROCLI_ADMIN_PIN),
       user_pin: env::var_os(NITROCLI_USER_PIN),
       new_admin_pin: env::var_os(NITROCLI_NEW_ADMIN_PIN),
@@ -154,8 +162,11 @@ fn main() {
 
   let rc = match config::Config::load() {
     Ok(config) => {
+      use crossterm::tty::IsTty as _;
+
+      let is_tty = stdout.is_tty();
       let args = env::args().collect::<Vec<_>>();
-      let ctx = &mut Context::from_env(&mut stdout, &mut stderr, config);
+      let ctx = &mut Context::from_env(&mut stdout, &mut stderr, is_tty, config);
 
       run(ctx, args)
     }

src/tests/mod.rs

@@ -99,6 +99,7 @@ impl Nitrocli {
     let ctx = &mut crate::Context {
       stdout: &mut stdout,
       stderr: &mut stderr,
+      is_tty: false,
       admin_pin: self.admin_pin.clone(),
       user_pin: self.user_pin.clone(),
       new_admin_pin: self.new_admin_pin.clone(),