feat: add "obnam init" subcommand

This reads a passphrase and derives two passwords from that, and
stores them next to the configuration file. The passwords aren't yet
used for anything, that will come later.

1 files changed, 28 insertions, 0 deletions

diff --git a/src/cmd/init.rs b/src/cmd/init.rs
new file mode 100644
index 0000000..f0ddb69
--- /dev/null
+++ b/src/cmd/init.rs
@@ -0,0 +1,28 @@
+use crate::client::ClientConfigWithoutPasswords;
+use crate::error::ObnamError;
+use crate::passwords::{passwords_filename, Passwords};
+use std::path::Path;
+
+const PROMPT: &str = "Obnam passphrase: ";
+
+pub fn init(
+    config: &ClientConfigWithoutPasswords,
+    config_filename: &Path,
+    insecure_passphrase: Option<String>,
+) -> Result<(), ObnamError> {
+    if !config.encrypt {
+        panic!("no encryption specified");
+    }
+
+    let passphrase = match insecure_passphrase {
+        Some(x) => x,
+        None => rpassword::read_password_from_tty(Some(PROMPT)).unwrap(),
+    };
+
+    let passwords = Passwords::new(&passphrase);
+    let filename = passwords_filename(config_filename);
+    passwords
+        .save(&filename)
+        .map_err(|err| ObnamError::PasswordSave(filename, err))?;
+    Ok(())
+}