monochromatic-git-policy-cli 0.5.16

Repository-owned Git policy wrapper: forwards Git commands and checks commits against configured policies.
Documentation 
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//! Controls for the landing's follow-up with real Git: the index entries of a commit Git built, whatever its names and
//!  however many, and the conclusion state removal.

use super::*;
use crate::test_support::{fixture, git, git_context, git_output, git_text, remove, repository};
use std::os::unix::ffi::OsStrExt;
use std::path::PathBuf;

/// A repository whose index is at the first commit while the branch is at a second commit that adds the given files.
fn index_behind(name: &str, files: &[Vec<u8>]) -> (PathBuf, PathBuf, String, String) {
    let root: PathBuf = fixture(name);
    let repo: PathBuf = repository(root.as_path(), "repo");
    let first: String = git_text(repo.as_path(), &["rev-parse", "HEAD"]);
    for file in files {
        let path: PathBuf = repo.join(std::ffi::OsStr::from_bytes(file.as_slice()));
        std::fs::create_dir_all(path.parent().expect("parent")).expect("directories");
        std::fs::write(path, b"x\n").expect("write");
    }
    git(repo.as_path(), &["add", "--all"]);
    git(repo.as_path(), &["commit", "--quiet", "--message=second"]);
    let second: String = git_text(repo.as_path(), &["rev-parse", "HEAD"]);
    git(repo.as_path(), &["read-tree", first.as_str()]);
    return (root, repo, first, second);
}


/// What the index still differs from the commit by.
fn differs(repo: &Path, commit: &str) -> bool {
    return !git_output(repo, &["diff", "--cached", "--quiet", commit]).status.success();
}

/// The paths that differ between the old branch and the commit are updated, as bytes, whatever their number.
#[test]
fn derived_paths_cover_names_that_are_not_text_and_lists_past_the_request_limit() {
    let mut files: Vec<Vec<u8>> = vec![b"not-utf8-\xff\xfe.txt".to_vec(), b"back\\slash \"quoted\".txt".to_vec(), b"line\nbreak.txt".to_vec()];
    files.extend((0..crate::service_protocol::MAX_CHANGES + 50).map(|number| { return format!("many/file-{number}.txt").into_bytes(); }));
    let (root, repo, first, second) = index_behind("service-follow-derived", files.as_slice());
    assert!(differs(repo.as_path(), second.as_str()), "the index starts behind the commit");
    update_index(&git_context(), repo.as_path(), second.as_str(), IndexPaths::Derived { old: first.as_str() }).expect("updated");
    assert!(!differs(repo.as_path(), second.as_str()));
    remove(root.as_path());
}

/// A branch that did not exist has an all-zero old value, and the commit's whole tree is what the index takes.
#[test]
fn a_root_commit_is_updated_from_the_all_zero_old_value() {
    let (root, repo, first, _second) = index_behind("service-follow-root", &[b"new.txt".to_vec()]);
    git(repo.as_path(), &["read-tree", "--empty"]);
    let zero: String = "0".repeat(first.len());
    update_index(&git_context(), repo.as_path(), first.as_str(), IndexPaths::Derived { old: zero.as_str() }).expect("updated");
    assert!(!differs(repo.as_path(), first.as_str()));
    remove(root.as_path());
}

/// An empty list changes nothing, because `reset` with no path would reset the whole index.
#[test]
fn an_empty_list_leaves_the_index_alone() {
    let (root, repo, first, second) = index_behind("service-follow-empty", &[b"new.txt".to_vec()]);
    update_index(&git_context(), repo.as_path(), second.as_str(), IndexPaths::Listed(&[])).expect("nothing to do");
    assert!(differs(repo.as_path(), second.as_str()));
    update_index(&git_context(), repo.as_path(), second.as_str(), IndexPaths::Derived { old: second.as_str() }).expect("no difference");
    assert!(differs(repo.as_path(), second.as_str()), "{first}");
    remove(root.as_path());
}

/// A removal request whose scratch directory is gone has nothing left to compare and is done.
#[test]
fn a_cleanup_without_its_scratch_directory_is_done() {
    let root: PathBuf = fixture("service-follow-gone");
    let repo: PathBuf = repository(root.as_path(), "repo");
    let cleanup: Cleanup = Cleanup { git_dir: repo.join(".git"), scratch: repo.join(".git").join("gone"), reftable: false };
    assert!(remove_conclusion_state(&git_context(), repo.as_path(), &cleanup));
    remove(root.as_path());
}