Exit with an error when a change could not be signed

Dependencies

• [2] ZXTHL45O address clippy lints
• [3] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).
• [4] DJYHARZ7 Skipping old files when recording

Change contents

• replacement in pijul/src/commands/record.rs at line 118
  [3.104455]→[3.104455:104711](∅→∅),[3.104711]→[2.0:35](∅→∅),[2.35]→[3.104757:105083](∅→∅),[3.104757]→[3.104757:105083](∅→∅)
  − if let Some((pk, signature)) = sign_hash(&mut key_path, hash).await? {

  − let sig = toml::Value::try_from(vec![Signature {

  − public_key: pk,

  − timestamp: change.header.timestamp,

  − signature,

  − }])?;

  − let mut toml = toml::map::Map::new();

  − toml.insert("signatures".to_string(), sig);

  − change.unhashed = Some(toml.into());

  − let hash2 = repo.changes.save_change(&change).unwrap();

  − assert_eq!(hash2, hash);
  [3.104455]

  [3.105083]
  + match sign_hash(&mut key_path, hash).await? {

  + Some((pk, signature)) if !signature.is_empty() => {

  + let sig = toml::Value::try_from(vec![Signature {

  + public_key: pk,

  + timestamp: change.header.timestamp,

  + signature,

  + }])?;

  + let mut toml = toml::map::Map::new();

  + toml.insert("signatures".to_string(), sig);

  + change.unhashed = Some(toml.into());

  + let hash2 = repo.changes.save_change(&change).unwrap();

  + assert_eq!(hash2, hash);

  + }

  + _ => {

  + bail!("Could not sign the change");

  + }