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.

4 files changed, 34 insertions, 1 deletions

diff --git a/src/cmd/backup.rs b/src/cmd/backup.rs
index e6781e9..bd36a3a 100644
--- a/src/cmd/backup.rs
+++ b/src/cmd/backup.rs
@@ -53,6 +53,7 @@ fn initial_backup(
     info!("fresh backup without a previous generation");
     let newtemp = NamedTempFile::new()?;
     let run = InitialBackup::new(config, &client)?;
+    let config = config.config();
     let mut all_warnings = vec![];
     let count = {
         let mut new = NascentGeneration::create(newtemp.path())?;
@@ -79,6 +80,7 @@ fn incremental_backup(
     info!("incremental backup based on {}", old_ref);
     let newtemp = NamedTempFile::new()?;
     let mut run = IncrementalBackup::new(config, &client)?;
+    let config = config.config();
     let mut all_warnings = vec![];
     let count = {
         let oldtemp = NamedTempFile::new()?;
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(())
+}
diff --git a/src/cmd/mod.rs b/src/cmd/mod.rs
index fc517be..70dde59 100644
--- a/src/cmd/mod.rs
+++ b/src/cmd/mod.rs
@@ -1,3 +1,6 @@
+mod init;
+pub use init::init;
+
 mod backup;
 pub use backup::backup;
 
diff --git a/src/cmd/show_config.rs b/src/cmd/show_config.rs
index b4f4cdc..8acd1c8 100644
--- a/src/cmd/show_config.rs
+++ b/src/cmd/show_config.rs
@@ -2,6 +2,6 @@ use crate::client::ClientConfig;
 use crate::error::ObnamError;
 
 pub fn show_config(config: &ClientConfig) -> Result<(), ObnamError> {
-    println!("{}", serde_json::to_string_pretty(config)?);
+    println!("{}", serde_json::to_string_pretty(&config.config())?);
     Ok(())
 }