git reset

I’m trying to reset a branch to a particular commit (i.e. git checkout <branch> && git reset [--soft] <commit>) but there doesn’t seem to be a reset command.

@wmhilton do you have plans to implement this in the near future? I don’t want to swamp you with more requests 😅 Seems like an easy thing to do manually by editing stuff in .git/

[juancampa]

Well, IIRC --hard has two additional effects: clearing the index and updating the working tree (checking out the branch). In theory you could do those two manually with:

const commit = <hash>;
const branch = <branch-name>;

// reset the branch
fs.writeFile(dir + `/.git/refs/heads/${branch}`, commit, (err) => {
  // clear the index (if any)
  fs.unlink(dir + '/.git/index', (err2) => {
    // checkout the branch into the working tree
    git.checkout({ dir, fs, ref: branch })
      .then(() => {
        // Done! (in theory, haven't tested it)
      });
  })
});

You also need to find out what commit HEAD~1 points to. I’m not sure if you could just pass "HEAD~1" and have the library resolve it for you, that would be a question for @wmhilton

NOTE: I haven’t tested this myself so use carefully

[jcubic]

it works but you made typo in path it should be '/.git/index' I use this code to reset to HEAD~<NUM>:

    async function gitReset({dir, ref, branch}) {
        var re = /^HEAD~([0-9]+)$/
        var m = ref.match(re);
        if (m) {
            var count = +m[1];
            var commits = await git.log({fs, dir, depth: count + 1});
            var commit = commits.pop().oid;
            return new Promise((resolve, reject) => {
                fs.writeFile(dir + `/.git/refs/heads/${branch}`, commit, (err) => {
                    if (err) {
                        return reject(err);
                    }
                    // clear the index (if any)
                    fs.unlink(dir + '/.git/index', (err) => {
                        if (err) {
                            return reject(err);
                        }
                        // checkout the branch into the working tree
                        git.checkout({ dir, fs, ref: branch }).then(resolve);
                    });
                });
            });
        }
        return Promise.reject(`Wrong ref ${ref}`);
    }