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git: extract function that resets Git HEAD
I'll add a workaround for the root parent issue #1495 there. We can pass in the wc parent id instead of the wc_commit object, but we might want to use wc_commit.id() to generate a unique placeholder ref name.
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@ -27,7 +27,7 @@ use std::time::SystemTime;
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use clap::builder::{NonEmptyStringValueParser, TypedValueParser, ValueParserFactory};
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use clap::{Arg, ArgAction, ArgMatches, Command, FromArgMatches};
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use git2::{Oid, Repository};
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use git2::Repository;
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use indexmap::IndexSet;
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use itertools::Itertools;
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use jj_lib::backend::{BackendError, ChangeId, CommitId, MergedTreeId, ObjectId};
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@ -43,7 +43,7 @@ use jj_lib::id_prefix::IdPrefixContext;
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use jj_lib::matchers::{EverythingMatcher, Matcher, PrefixMatcher, Visit};
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use jj_lib::merged_tree::{MergedTree, MergedTreeBuilder};
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use jj_lib::op_heads_store::{self, OpHeadResolutionError, OpHeadsStore};
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use jj_lib::op_store::{OpStore, OpStoreError, OperationId, RefTarget, WorkspaceId};
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use jj_lib::op_store::{OpStore, OpStoreError, OperationId, WorkspaceId};
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use jj_lib::operation::Operation;
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use jj_lib::repo::{
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CheckOutCommitError, EditCommitError, MutableRepo, ReadonlyRepo, Repo, RepoLoader,
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@ -849,14 +849,7 @@ impl WorkspaceCommandHelper {
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) -> Result<(), CommandError> {
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if let Some(wc_commit_id) = mut_repo.view().get_wc_commit_id(self.workspace_id()) {
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let wc_commit = mut_repo.store().get_commit(wc_commit_id)?;
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let first_parent_id = wc_commit.parent_ids()[0].clone();
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if first_parent_id != *mut_repo.store().root_commit_id() {
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let new_git_commit_id = Oid::from_bytes(first_parent_id.as_bytes()).unwrap();
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let new_git_commit = git_repo.find_commit(new_git_commit_id)?;
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git_repo.set_head_detached(new_git_commit_id)?;
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git_repo.reset(new_git_commit.as_object(), git2::ResetType::Mixed, None)?;
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mut_repo.set_git_head_target(RefTarget::normal(first_parent_id));
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}
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git::reset_head(mut_repo, git_repo, &wc_commit)?;
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} else {
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// The workspace was removed (maybe the user undid the
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// initialization of the workspace?), which is weird,
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@ -26,6 +26,7 @@ use tempfile::NamedTempFile;
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use thiserror::Error;
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use crate::backend::{BackendError, CommitId, ObjectId};
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use crate::commit::Commit;
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use crate::git_backend::GitBackend;
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use crate::op_store::{BranchTarget, RefTarget, RefTargetOptionExt};
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use crate::repo::{MutableRepo, Repo};
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@ -675,6 +676,24 @@ fn update_git_ref(
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Ok(())
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}
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/// Sets `HEAD@git` to the parent of the given working-copy commit and resets
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/// the Git index.
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pub fn reset_head(
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mut_repo: &mut MutableRepo,
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git_repo: &git2::Repository,
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wc_commit: &Commit,
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) -> Result<(), git2::Error> {
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let first_parent_id = &wc_commit.parent_ids()[0];
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if first_parent_id != mut_repo.store().root_commit_id() {
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let new_git_commit_id = Oid::from_bytes(first_parent_id.as_bytes()).unwrap();
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let new_git_commit = git_repo.find_commit(new_git_commit_id)?;
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git_repo.set_head_detached(new_git_commit_id)?;
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git_repo.reset(new_git_commit.as_object(), git2::ResetType::Mixed, None)?;
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mut_repo.set_git_head_target(RefTarget::normal(first_parent_id.clone()));
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}
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Ok(())
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}
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#[derive(Debug, Error)]
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pub enum GitRemoteManagementError {
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#[error("No git remote named '{0}'")]
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