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// Copyright (c) 2021 Teddy Wing
//
// This file is part of Reflectub.
//
// Reflectub is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Reflectub is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Reflectub. If not, see <https://www.gnu.org/licenses/>.
use thiserror;
use std::fs;
use std::io::Write;
use std::path::Path;
#[derive(Debug, thiserror::Error)]
pub enum Error {
MirrorCreateRepo(),
MirrorConfig(),
// What is remote_with_fetch?
// A: Add a remote with the provided refspec to the repository's config
MirrorFetch(),
UpdateOpenRepo(),
UpdateGetRemotes(),
UpdateFindRemote(),
UpdateFetch(),
GitChangeBranch(),
#[error("git error")]
Git(#[from] git2::Error),
#[error(transparent)]
Io(#[from] std::io::Error),
}
/// Mirror a repository.
///
/// Works like:
///
/// ```shell
/// git clone --mirror URL
/// ```
pub fn mirror<P: AsRef<Path>>(
url: &str,
path: P,
description: &str,
default_branch: &str,
) -> Result<(), Error> {
let repo = git2::Repository::init_opts(
path,
&git2::RepositoryInitOptions::new()
.bare(true)
// On Linux, using the external template prevents the custom
// description from being added. It doesn't make a difference on
// Mac OS.
.external_template(false)
.description(description),
)?;
let remote_name = "origin";
let mut remote = repo.remote_with_fetch(
remote_name,
url,
"+refs/*:refs/*",
)?;
let mut config = repo.config()?;
config.set_bool(
&format!("remote.{}.mirror", remote_name),
true,
)?;
let refspecs: [&str; 0] = [];
remote.fetch(&refspecs, None, None)?;
if default_branch != "master" {
repo_change_current_branch(&repo, default_branch)?;
}
Ok(())
}
/// Update remotes.
///
/// Works like:
///
/// ```shell
/// git remote update
/// ```
pub fn update<P: AsRef<Path>>(
path: P,
) -> Result<(), Error> {
let repo = git2::Repository::open_bare(path)?;
for remote_opt in &repo.remotes()? {
if let Some(remote_name) = remote_opt {
let mut remote = repo.find_remote(remote_name)?;
let mut fetch_options = git2::FetchOptions::new();
fetch_options
.prune(git2::FetchPrune::On)
.download_tags(git2::AutotagOption::All);
let refspecs: [&str; 0] = [];
remote.fetch(&refspecs, Some(&mut fetch_options), None)?;
}
}
Ok(())
}
/// Update the repository's description file.
pub fn update_description<P: AsRef<Path>>(
repo_path: P,
description: &str,
) -> Result<(), Error> {
let description_path = repo_path.as_ref().join("description");
let mut file = fs::OpenOptions::new()
.write(true)
.truncate(true)
.open(description_path)?;
if description.is_empty() {
file.set_len(0)?;
} else {
writeln!(file, "{}", description)?;
}
Ok(())
}
/// Change the current branch of the repository at `repo_path` to
/// `default_branch`.
pub fn change_current_branch<P: AsRef<Path>>(
repo_path: P,
default_branch: &str,
) -> Result<(), Error> {
let repo = git2::Repository::open_bare(repo_path)?;
Ok(
repo_change_current_branch(&repo, default_branch)?
)
}
/// Change `repo`'s current branch to `default_branch`.
fn repo_change_current_branch(
repo: &git2::Repository,
default_branch: &str,
) -> Result<(), Error> {
Ok(
repo.set_head(
&format!("refs/heads/{}", default_branch),
)?
)
}
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