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//! Object IDs and trees built in the repository's object format.
use super::Repository;
use crate::{ObjectId, ParseObjectIdError, Tree, TreeEntry, TreeError};
impl Repository {
/// Builds an object ID from raw digest bytes in this repository's object format.
///
/// Equivalent to `ObjectId::from_bytes(repo.object_format(), bytes)`; see
/// [`ObjectId::from_bytes`]. Use it when an ID crosses a boundary as bytes, such as a
/// consumer's own commit ID type.
///
/// # Errors
///
/// Returns [`ParseObjectIdError`] when `bytes` isn't exactly one digest of this format: 20
/// bytes for SHA-1, 32 for SHA-256.
///
/// ```
/// use girt::{InitKind, ObjectFormat, Repository};
/// let directory = tempfile::tempdir()?;
/// let repo = Repository::init(
/// ObjectFormat::Sha256,
/// directory.path().join("r.git"),
/// InitKind::Bare,
/// )?;
/// let id = repo.loose_objects().write_blob(b"notes")?;
/// assert_eq!(repo.object_id_from_bytes(id.as_bytes())?, id);
/// assert!(repo.object_id_from_bytes(&[0; 20]).is_err()); // A SHA-1 length.
///
/// # Ok::<(), Box<dyn std::error::Error>>(())
/// ```
pub fn object_id_from_bytes(&self, bytes: &[u8]) -> Result<ObjectId, ParseObjectIdError> {
ObjectId::from_bytes(self.object_format(), bytes)
}
/// Parses a full hexadecimal object ID in this repository's object format.
///
/// Equivalent to `ObjectId::from_hex(repo.object_format(), hex)`; see [`ObjectId::from_hex`].
/// Abbreviated IDs need [`crate::Objects::resolve_prefix`] instead.
///
/// # Errors
///
/// Returns [`ParseObjectIdError`] for non-hexadecimal text or a length other than this
/// format's full width.
///
/// ```
/// use girt::{InitKind, ObjectFormat, Repository};
///
/// let directory = tempfile::tempdir()?;
/// let repo = Repository::init(
/// ObjectFormat::Sha1,
/// directory.path().join("r.git"),
/// InitKind::Bare,
/// )?;
///
/// let id = repo.loose_objects().write_blob(b"hello")?;
/// assert_eq!(
/// repo.object_id_from_hex("b6fc4c620b67d95f953a5c1c1230aaab5db5a1b0")?,
/// id
/// );
/// assert!(repo.object_id_from_hex("b6fc4c6").is_err());
/// # Ok::<(), Box<dyn std::error::Error>>(())
/// ```
pub fn object_id_from_hex(&self, hex: &str) -> Result<ObjectId, ParseObjectIdError> {
ObjectId::from_hex(self.object_format(), hex)
}
/// Builds a validated tree in this repository's object format.
///
/// Equivalent to `Tree::new(repo.object_format(), entries)`; see [`Tree::new`] for sorting,
/// name validation and the format check on entry IDs. The tree is not written; pass it to
/// [`crate::LooseObjects::write_tree`].
///
/// # Errors
///
/// Returns the errors of [`Tree::new`], including an entry ID of the other format.
///
/// ```
/// use girt::{InitKind, ObjectFormat, Repository};
/// let directory = tempfile::tempdir()?;
/// let repo = Repository::init(
/// ObjectFormat::Sha256,
/// directory.path().join("r.git"),
/// InitKind::Bare,
/// )?;
/// let empty = repo.loose_objects().write_tree(&repo.new_tree(vec![])?)?;
/// assert_eq!(empty.format(), ObjectFormat::Sha256);
/// # Ok::<(), Box<dyn std::error::Error>>(())
/// ```
pub fn new_tree(&self, entries: Vec<TreeEntry>) -> Result<Tree, TreeError> {
Tree::new(self.object_format(), entries)
}
}
#[cfg(test)]
mod tests {
use rstest::rstest;
use crate::{EntryMode, InitKind, ObjectFormat, ObjectId, Repository, Tree, TreeEntry};
fn repository(format: ObjectFormat) -> (tempfile::TempDir, Repository) {
let directory = tempfile::tempdir().unwrap();
let repo =
Repository::init(format, directory.path().join("r.git"), InitKind::Bare).unwrap();
(directory, repo)
}
#[rstest]
#[case::sha1(ObjectFormat::Sha1)]
#[case::sha256(ObjectFormat::Sha256)]
fn ids_take_the_repository_format(#[case] format: ObjectFormat) {
let (_directory, repo) = repository(format);
let id = ObjectId::for_blob(format, b"payload");
assert_eq!(repo.object_id_from_bytes(id.as_bytes()).unwrap(), id);
assert_eq!(repo.object_id_from_hex(&id.to_string()).unwrap(), id);
}
#[rstest]
#[case::sha1_repository(ObjectFormat::Sha1, ObjectFormat::Sha256)]
#[case::sha256_repository(ObjectFormat::Sha256, ObjectFormat::Sha1)]
fn ids_of_the_other_format_are_rejected(
#[case] format: ObjectFormat,
#[case] other: ObjectFormat,
) {
let (_directory, repo) = repository(format);
let id = ObjectId::for_blob(other, b"payload");
assert!(repo.object_id_from_bytes(id.as_bytes()).is_err());
assert!(repo.object_id_from_hex(&id.to_string()).is_err());
}
#[rstest]
#[case::sha1(ObjectFormat::Sha1)]
#[case::sha256(ObjectFormat::Sha256)]
fn trees_take_the_repository_format(#[case] format: ObjectFormat) {
let (_directory, repo) = repository(format);
let entries = vec![TreeEntry {
mode: EntryMode::Blob,
name: b"a".to_vec(),
id: ObjectId::for_blob(format, b"a"),
}];
let tree = repo.new_tree(entries.clone()).unwrap();
assert_eq!(tree, Tree::new(format, entries).unwrap());
}
#[test]
fn tree_rejects_entries_of_the_other_format() {
let (_directory, repo) = repository(ObjectFormat::Sha256);
let entries = vec![TreeEntry {
mode: EntryMode::Blob,
name: b"a".to_vec(),
id: ObjectId::for_blob(ObjectFormat::Sha1, b"a"),
}];
assert!(repo.new_tree(entries).is_err());
}
}