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use std::str;
use anyhow::{bail, Result};
use git2::{Reference, Repository};
use log::debug;
use super::status::ensure_repo_clean;
use crate::tasks::git::{checkout::set_and_checkout_head, errors::GitError as E};
pub(super) fn do_merge<'a>(
repo: &'a Repository,
branch_name: &str,
fetch_commit: &git2::AnnotatedCommit<'a>,
) -> Result<()> {
let analysis = repo.merge_analysis(&[fetch_commit])?;
debug!("Merge analysis: {:?}", &analysis);
if analysis.0.is_fast_forward() {
debug!("Doing a fast forward");
if let Ok(mut r) = repo.find_reference(branch_name) {
fast_forward(repo, &mut r, fetch_commit)?;
} else {
repo.reference(
branch_name,
fetch_commit.id(),
true,
&format!("Setting {} to {}", branch_name, fetch_commit.id()),
)?;
set_and_checkout_head(repo, branch_name, false)?;
}
} else if analysis.0.is_up_to_date() {
debug!("Skipping fast-forward merge as already up-to-date.");
} else {
bail!(E::CannotFastForwardMerge {
analysis: analysis.0,
preference: analysis.1
});
}
Ok(())
}
fn fast_forward(repo: &Repository, lb: &mut Reference, rc: &git2::AnnotatedCommit) -> Result<()> {
let name = match lb.name() {
Some(s) => s.to_string(),
None => String::from_utf8_lossy(lb.name_bytes()).to_string(),
};
let msg = format!("Fast-Forward: Setting {} to id: {}", name, rc.id());
debug!("{}", msg);
ensure_repo_clean(repo)?;
lb.set_target(rc.id(), &msg)?;
set_and_checkout_head(repo, &name, true)?;
Ok(())
}