monochromatic-git-policy-cli 0.4.2

//! Controls for `git cli-git doctor`: which entries count as traditional hooks, which directories are scanned,
//! and the exit status and output of the command.

use super::*;
use crate::test_support::{executable, fixture, git, git_context, remove, repository};

/// Names of the paths in a list, for compact comparison.
fn names(paths: &[PathBuf]) -> Vec<String> {
    return paths
        .iter()
        .map(|path| { return path.file_name().expect("name").to_string_lossy().into_owned(); })
        .collect();
}

/// Unpack the exit status, standard output and standard error of an exit action.
fn exit_parts(action: Action) -> (i32, String, String) {
    let Action::Exit { code, stdout, stderr } = action else {
        panic!("doctor must end in an exit action");
    };
    return (code, stdout, stderr);
}

/// Executable regular files and symbolic links are hooks; samples, plain files and directories are not.
#[cfg(unix)]
#[test]
fn only_executable_files_and_links_are_hooks() {
    let root: PathBuf = fixture("doctor-scan");
    let hooks: PathBuf = root.join("hooks");
    std::fs::create_dir(&hooks).expect("hooks");
    executable(hooks.join("pre-commit").as_path(), b"#!/bin/sh\n");
    executable(hooks.join("commit-msg.sample").as_path(), b"#!/bin/sh\n");
    std::fs::write(hooks.join("post-commit"), b"#!/bin/sh\n").expect("plain file");
    std::fs::create_dir(hooks.join("pre-push")).expect("directory");
    std::os::unix::fs::symlink(root.join("nowhere"), hooks.join("update")).expect("dangling link");
    std::os::unix::fs::symlink(hooks.join("pre-commit"), hooks.join("pre-rebase")).expect("working link");
    std::os::unix::fs::symlink(hooks.join("pre-commit"), hooks.join("applypatch-msg.sample")).expect("sample link");
    let found: Vec<PathBuf> = scan_hooks_directory(hooks.as_path()).expect("scan");
    assert_eq!(names(found.as_slice()), vec!["pre-commit", "pre-rebase", "update"]);
    assert!(found.iter().all(|path| { return path.starts_with(&hooks); }));
    remove(root.as_path());
}

/// A directory that does not exist, or is a file, holds no hooks; nothing is created.
#[test]
fn a_missing_or_non_directory_path_holds_no_hooks() {
    let root: PathBuf = fixture("doctor-missing");
    assert_eq!(scan_hooks_directory(root.join("absent").as_path()).expect("scan"), Vec::<PathBuf>::new());
    std::fs::write(root.join("file"), b"x").expect("file");
    assert_eq!(scan_hooks_directory(root.join("file").as_path()).expect("scan"), Vec::<PathBuf>::new());
    assert!(!root.join("absent").exists());
    remove(root.as_path());
}

/// A directory that cannot be read is an error, not silence.
#[cfg(unix)]
#[test]
fn an_unreadable_directory_is_an_error() {
    use std::os::unix::fs::PermissionsExt;
    let root: PathBuf = fixture("doctor-unreadable");
    let hooks: PathBuf = root.join("hooks");
    std::fs::create_dir(&hooks).expect("hooks");
    std::fs::set_permissions(&hooks, std::fs::Permissions::from_mode(0o000)).expect("seal");
    let readable_anyway: bool = std::fs::read_dir(&hooks).is_ok();
    let outcome = scan_hooks_directory(hooks.as_path());
    std::fs::set_permissions(&hooks, std::fs::Permissions::from_mode(0o700)).expect("unseal");
    // A process that ignores permission bits (root) cannot be refused, so only a refusing process proves the error.
    if !readable_anyway {
        assert!(outcome.is_err());
    }
    remove(root.as_path());
}

/// The default directory comes first, the configured one follows, and one directory named two ways is scanned once.
#[test]
fn directories_are_the_default_then_the_configured_one_once() {
    let plain: HooksLocation = HooksLocation {
        common_directory: PathBuf::from("/repo/.git"),
        configured: None,
    };
    assert_eq!(hook_directories(&plain), vec![PathBuf::from("/repo/.git/hooks")]);
    let configured: HooksLocation = HooksLocation {
        common_directory: PathBuf::from("/repo/.git"),
        configured: Some(PathBuf::from("/repo/custom")),
    };
    assert_eq!(
        hook_directories(&configured),
        vec![PathBuf::from("/repo/.git/hooks"), PathBuf::from("/repo/custom")]
    );
    let same: HooksLocation = HooksLocation {
        common_directory: PathBuf::from("/repo/.git"),
        configured: Some(PathBuf::from("/repo/./sub/../.git/hooks/")),
    };
    assert_eq!(hook_directories(&same), vec![PathBuf::from("/repo/.git/hooks")]);
}

/// The report is one path per line and nothing else.
#[test]
fn the_report_is_one_path_per_line() {
    assert_eq!(render_hooks(&[]), "");
    assert_eq!(
        render_hooks(&[PathBuf::from("/a/hooks/pre-commit"), PathBuf::from("/b/update")]),
        "/a/hooks/pre-commit\n/b/update\n"
    );
}

/// The locator asks Git, so a relative `core.hooksPath` resolves against the worktree root, not the current directory.
#[test]
fn a_relative_hooks_path_resolves_against_the_worktree_root() {
    let root: PathBuf = fixture("doctor-locate");
    let repo: PathBuf = repository(root.as_path(), "repo");
    std::fs::create_dir(repo.join("sub")).expect("sub");
    let context: GitContext = git_context();
    let plain: HooksLocation = locate_hooks(&context, repo.join("sub").as_path()).expect("locate");
    assert_eq!(plain.common_directory, repo.join(".git"));
    assert_eq!(plain.configured, None);
    git(repo.as_path(), &["config", "core.hooksPath", "custom-hooks"]);
    let relative: HooksLocation = locate_hooks(&context, repo.join("sub").as_path()).expect("locate");
    assert_eq!(relative.configured, Some(repo.join("custom-hooks")));
    git(repo.as_path(), &["config", "core.hooksPath", "/elsewhere/hooks"]);
    let absolute: HooksLocation = locate_hooks(&context, repo.as_path()).expect("locate");
    assert_eq!(absolute.configured, Some(PathBuf::from("/elsewhere/hooks")));
    remove(root.as_path());
}

/// A linked worktree shares the main repository's hooks directory.
#[test]
fn a_linked_worktree_reports_the_shared_common_directory() {
    let root: PathBuf = fixture("doctor-linked");
    let repo: PathBuf = repository(root.as_path(), "repo");
    let linked: PathBuf = root.join("linked");
    git(repo.as_path(), &["worktree", "add", "--quiet", "-b", "feature", linked.to_str().expect("UTF-8")]);
    let location: HooksLocation = locate_hooks(&git_context(), linked.as_path()).expect("locate");
    assert_eq!(location.common_directory, repo.join(".git"));
    remove(root.as_path());
}

/// A directory with no hooks ends with status 0 and prints nothing.
#[test]
fn a_repository_without_traditional_hooks_exits_zero_silently() {
    let root: PathBuf = fixture("doctor-clean");
    let repo: PathBuf = repository(root.as_path(), "repo");
    executable(repo.join(".git/hooks/pre-commit.sample").as_path(), b"#!/bin/sh\n");
    let (code, stdout, stderr) = exit_parts(doctor_action(&git_context(), repo.as_path()));
    assert_eq!((code, stdout.as_str(), stderr.as_str()), (0, "", ""));
    remove(root.as_path());
}

/// A hook in the default directory ends with status 1 and is listed by path.
#[cfg(unix)]
#[test]
fn a_default_directory_hook_is_listed_with_status_one() {
    let root: PathBuf = fixture("doctor-default");
    let repo: PathBuf = repository(root.as_path(), "repo");
    executable(repo.join(".git/hooks/pre-commit").as_path(), b"#!/bin/sh\n");
    let (code, stdout, stderr) = exit_parts(doctor_action(&git_context(), repo.as_path()));
    assert_eq!(code, 1);
    assert_eq!(stdout, format!("{}\n", repo.join(".git/hooks/pre-commit").display()));
    assert!(stderr.contains("unsupported"), "{stderr}");
    remove(root.as_path());
}

/// Hooks in a configured directory and in the default one are all listed, the default directory first.
#[cfg(unix)]
#[test]
fn hooks_in_both_directories_are_listed_default_first() {
    let root: PathBuf = fixture("doctor-both");
    let repo: PathBuf = repository(root.as_path(), "repo");
    executable(repo.join(".git/hooks/commit-msg").as_path(), b"#!/bin/sh\n");
    std::fs::create_dir(repo.join("custom")).expect("custom");
    executable(repo.join("custom/pre-commit").as_path(), b"#!/bin/sh\n");
    git(repo.as_path(), &["config", "core.hooksPath", "custom"]);
    let (code, stdout, _stderr) = exit_parts(doctor_action(&git_context(), repo.as_path()));
    assert_eq!(code, 1);
    assert_eq!(
        stdout,
        format!(
            "{}\n{}\n",
            repo.join(".git/hooks/commit-msg").display(),
            repo.join("custom/pre-commit").display()
        )
    );
    remove(root.as_path());
}

/// Outside a repository the command reports the failure with status 2 and lists nothing.
#[test]
fn outside_a_repository_the_command_fails_with_status_two() {
    let root: PathBuf = fixture("doctor-outside");
    let (code, stdout, stderr) = exit_parts(doctor_action(&git_context(), root.as_path()));
    assert_eq!((code, stdout.as_str()), (2, ""));
    assert!(stderr.starts_with("git cli-git doctor: "), "{stderr}");
    remove(root.as_path());
}

/// Write the shim git-lfs writes for `name` into the default hooks directory.
#[cfg(unix)]
fn write_shim(repo: &Path, name: &str) -> PathBuf {
    let path: PathBuf = repo.join(".git/hooks").join(name);
    executable(path.as_path(), lfs_shim_text(name).as_bytes());
    return path;
}

/// The shim text is the one git-lfs 3.8.0 writes: its first, last and name-bearing lines.
#[test]
fn the_shim_text_carries_the_hook_name_and_ends_with_a_line_feed() {
    let text: String = lfs_shim_text("post-merge");
    assert!(
        text.starts_with(
            "#!/bin/sh\ncommand -v git-lfs >/dev/null 2>&1 || { printf >&2 \"\\n%s\\n\\n\" \"This repository is configured for Git LFS"
        ),
        "{text}"
    );
    assert!(text.contains("deleting the 'post-merge' file in the hooks directory"), "{text}");
    assert!(text.ends_with("\ngit lfs post-merge \"$@\"\n"), "{text}");
    assert!(!text.contains("{{Command}}"));
}

/// Only shims alone end with status 0, nothing on standard output, and a report on standard error that says what
///  is happening, that it is normal, and that nothing needs doing.
#[cfg(unix)]
#[test]
fn only_git_lfs_shims_exit_zero_with_the_explanation() {
    let root: PathBuf = fixture("doctor-shims-only");
    let repo: PathBuf = repository(root.as_path(), "repo");
    let pre_push: PathBuf = write_shim(repo.as_path(), "pre-push");
    write_shim(repo.as_path(), "post-checkout");
    let (code, stdout, stderr) = exit_parts(doctor_action(&git_context(), repo.as_path()));
    assert_eq!((code, stdout.as_str()), (0, ""));
    for needle in [
        "the Git LFS shims, byte for byte, and nothing needs doing",
        pre_push.to_str().expect("UTF-8"),
        "writes these files again whenever it cleans a file in a Git that cli-git did not start",
        "so they can come back after you delete them",
        "this is normal",
        "uploads the LFS objects itself before every push",
        "starts Git with traditional hooks off",
        "never run through cli-git",
        "delete them or leave them",
        "/usr/bin/git",
    ] {
        assert!(stderr.contains(needle), "{needle}: {stderr}");
    }
    assert!(!stderr.contains("unsupported"), "{stderr}");
    remove(root.as_path());
}

/// A foreign hook beside the shims ends with status 1 and lists only the foreign hook on standard output;
///  the shims are explained apart.
#[cfg(unix)]
#[test]
fn a_foreign_hook_beside_shims_still_ends_with_status_one() {
    let root: PathBuf = fixture("doctor-shims-and-foreign");
    let repo: PathBuf = repository(root.as_path(), "repo");
    let shim: PathBuf = write_shim(repo.as_path(), "post-commit");
    executable(repo.join(".git/hooks/pre-commit").as_path(), b"#!/bin/sh\n");
    let (code, stdout, stderr) = exit_parts(doctor_action(&git_context(), repo.as_path()));
    assert_eq!(code, 1);
    assert_eq!(stdout, format!("{}\n", repo.join(".git/hooks/pre-commit").display()));
    assert!(stderr.contains("unsupported"), "{stderr}");
    assert!(stderr.contains(shim.to_str().expect("UTF-8")), "{stderr}");
    assert!(stderr.contains("nothing needs doing"), "{stderr}");
    remove(root.as_path());
}

/// A shim that differs by one byte, a shim under another hook's name, a link, and a missing final line feed are
///  ordinary unsupported hooks.
#[cfg(unix)]
#[test]
fn a_modified_misnamed_or_linked_shim_is_an_unsupported_hook() {
    let root: PathBuf = fixture("doctor-shims-lookalikes");
    let repo: PathBuf = repository(root.as_path(), "repo");
    let hooks: PathBuf = repo.join(".git/hooks");
    let mut edited: String = lfs_shim_text("pre-push");
    edited.push('#');
    executable(hooks.join("pre-push").as_path(), edited.as_bytes());
    executable(hooks.join("post-commit").as_path(), lfs_shim_text("post-merge").as_bytes());
    let mut without_line_feed: String = lfs_shim_text("post-checkout");
    without_line_feed.pop();
    executable(hooks.join("post-checkout").as_path(), without_line_feed.as_bytes());
    executable(root.join("target-shim").as_path(), lfs_shim_text("post-merge").as_bytes());
    std::os::unix::fs::symlink(root.join("target-shim"), hooks.join("post-merge")).expect("link");
    executable(hooks.join("update").as_path(), lfs_shim_text("update").as_bytes());
    let (code, stdout, stderr) = exit_parts(doctor_action(&git_context(), repo.as_path()));
    assert_eq!(code, 1);
    assert_eq!(stdout.lines().count(), 5, "{stdout}");
    assert!(!stderr.contains("the Git LFS shims, byte for byte"), "{stderr}");
    remove(root.as_path());
}

/// Every one of the four names is recognized with its own text.
#[cfg(unix)]
#[test]
fn each_of_the_four_shims_is_recognized() {
    let root: PathBuf = fixture("doctor-shims-all");
    let repo: PathBuf = repository(root.as_path(), "repo");
    for name in ["pre-push", "post-checkout", "post-commit", "post-merge"] {
        assert!(is_lfs_shim(write_shim(repo.as_path(), name).as_path()), "{name}");
    }
    let (code, stdout, _stderr) = exit_parts(doctor_action(&git_context(), repo.as_path()));
    assert_eq!((code, stdout.as_str()), (0, ""));
    remove(root.as_path());
}