Apply: proper error message when the change is not found

Dependencies

• [2] YN63NUZO Sanakirja 1.0
• [3] R3H7D42U Debugging `pijul git`: proper error reporting
• [4] 5SLOJYHG Fixing the Git feature
• [5] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).

Change contents

• replacement in pijul/src/commands/apply.rs at line 45
  [3.195560]→[3.195560:195640](∅→∅)
  − let change = libpijul::change::Change::deserialize(&ch, None)?;
  [3.195560]

  [3.195640]
  + let change = libpijul::change::Change::deserialize(&ch, None);

  + let change = match change {

  + Ok(change) => change,

  + Err(libpijul::change::ChangeError::Io(e)) => {

  + if let std::io::ErrorKind::NotFound = e.kind() {

  + let extra = if std::path::Path::new(&ch).is_relative() {

  + " Using the full path to the change file may help."

  + } else {

  + ""

  + };

  + bail!("File {} not found, and not recognised as a prefix of a known change identifier.{}", ch, extra)

  + } else {

  + return Err(e.into())

  + }

  + }

  + Err(e) => return Err(e.into())

  + };
• replacement in pijul/src/commands/apply.rs at line 79
  [2.14342]→[3.1302:1376](∅→∅),[3.1302]→[3.1302:1376](∅→∅)
  − txn.apply_change_rec(&repo.changes, &mut channel, hash)?;
  [2.14342]

  [3.1376]
  + txn.apply_change_rec(&repo.changes, &mut channel, hash)?