static int reference__rename(git_reference **out, git_reference *ref, const char *new_name, int force,
const git_signature *signature, const char *message)
{
git_refname_t normalized;
bool should_head_be_updated = false;
int error = 0;
assert(ref && new_name && signature);
if ((error = reference_normalize_for_repo(
normalized, git_reference_owner(ref), new_name)) < 0)
return error;
/* Check if we have to update HEAD. */
if ((error = git_branch_is_head(ref)) < 0)
return error;
should_head_be_updated = (error > 0);
if ((error = git_refdb_rename(out, ref->db, ref->name, normalized, force, signature, message)) < 0)
return error;
/* Update HEAD it was pointing to the reference being renamed */
if (should_head_be_updated &&
(error = git_repository_set_head(ref->db->repo, normalized)) < 0) {
giterr_set(GITERR_REFERENCE, "Failed to update HEAD after renaming reference");
return error;
}
return 0;
}
/*
* The remote is strictly newer than the local branch.
*/
static int reset_to_remote(git_repository *repo, git_reference *local, const git_oid *new_id)
{
git_checkout_options opts = GIT_CHECKOUT_OPTIONS_INIT;
git_object *target;
// If it's not checked out (bare or not HEAD), just update the reference */
if (git_repository_is_bare(repo) || git_branch_is_head(local) != 1) {
git_reference *out;
if (git_reference_set_target(&out, local, new_id, "Update to remote"))
return report_error("Could not update local ref to newer remote ref");
git_reference_free(out);
// Not really an error, just informational
report_error("Updated local branch from remote");
return 0;
}
if (git_object_lookup(&target, repo, new_id, GIT_OBJ_COMMIT))
return report_error("Could not look up remote commit");
opts.checkout_strategy = GIT_CHECKOUT_SAFE;
if (git_reset(repo, target, GIT_RESET_HARD, &opts))
return report_error("Local head checkout failed after update");
// Not really an error, just informational
report_error("Updated local information from remote");
return 0;
}
static int create_branch(
git_reference **ref_out,
git_repository *repository,
const char *branch_name,
const git_commit *commit,
const char *from,
int force)
{
int is_unmovable_head = 0;
git_reference *branch = NULL;
git_buf canonical_branch_name = GIT_BUF_INIT,
log_message = GIT_BUF_INIT;
int error = -1;
int bare = git_repository_is_bare(repository);
assert(branch_name && commit && ref_out);
assert(git_object_owner((const git_object *)commit) == repository);
if (force && !bare && git_branch_lookup(&branch, repository, branch_name, GIT_BRANCH_LOCAL) == 0) {
error = git_branch_is_head(branch);
git_reference_free(branch);
branch = NULL;
if (error < 0)
goto cleanup;
is_unmovable_head = error;
}
if (is_unmovable_head && force) {
giterr_set(GITERR_REFERENCE, "Cannot force update branch '%s' as it is "
"the current HEAD of the repository.", branch_name);
error = -1;
goto cleanup;
}
if (git_buf_joinpath(&canonical_branch_name, GIT_REFS_HEADS_DIR, branch_name) < 0)
goto cleanup;
if (git_buf_printf(&log_message, "branch: Created from %s", from) < 0)
goto cleanup;
error = git_reference_create(&branch, repository,
git_buf_cstr(&canonical_branch_name), git_commit_id(commit), force,
git_buf_cstr(&log_message));
if (!error)
*ref_out = branch;
cleanup:
git_buf_free(&canonical_branch_name);
git_buf_free(&log_message);
return error;
}
/*
* $ git init .
* Initialized empty Git repository in d:/temp/tempee/.git/
*
* $ touch a && git add a
* $ git commit -m" boom"
* [master (root-commit) b47b758] boom
* 0 files changed
* create mode 100644 a
*
* $ echo "ref: refs/heads/master" > .git/refs/heads/linked
* $ echo "ref: refs/heads/linked" > .git/refs/heads/super
* $ echo "ref: refs/heads/super" > .git/HEAD
*
* $ git branch
* linked -> master
* * master
* super -> master
*/
void test_refs_branches_ishead__only_direct_references_are_considered(void)
{
git_reference *linked, *super, *head;
git_repository_free(repo);
repo = cl_git_sandbox_init("testrepo.git");
cl_git_pass(git_reference_create_symbolic(&linked, repo, "refs/heads/linked", "refs/heads/master", 0));
cl_git_pass(git_reference_create_symbolic(&super, repo, "refs/heads/super", "refs/heads/linked", 0));
cl_git_pass(git_reference_create_symbolic(&head, repo, GIT_HEAD_FILE, "refs/heads/super", 1));
cl_assert_equal_i(false, git_branch_is_head(linked));
cl_assert_equal_i(false, git_branch_is_head(super));
cl_git_pass(git_repository_head(&branch, repo));
cl_assert_equal_s("refs/heads/master", git_reference_name(branch));
git_reference_free(linked);
git_reference_free(super);
git_reference_free(head);
cl_git_sandbox_cleanup();
repo = NULL;
}
static int try_to_update(git_repository *repo, git_remote *origin, git_reference *local, git_reference *remote, enum remote_transport rt)
{
git_oid base;
const git_oid *local_id, *remote_id;
if (!git_reference_cmp(local, remote))
return 0;
// Dirty modified state in the working tree? We're not going
// to update either way
if (git_status_foreach(repo, check_clean, NULL))
return report_error("local cached copy is dirty, skipping update");
local_id = git_reference_target(local);
remote_id = git_reference_target(remote);
if (!local_id || !remote_id)
return report_error("Unable to get local or remote SHA1");
if (git_merge_base(&base, repo, local_id, remote_id))
return report_error("Unable to find common commit of local and remote branches");
/* Is the remote strictly newer? Use it */
if (git_oid_equal(&base, local_id))
return reset_to_remote(repo, local, remote_id);
/* Is the local repo the more recent one? See if we can update upstream */
if (git_oid_equal(&base, remote_id))
return update_remote(repo, origin, local, remote, rt);
/* Merging a bare repository always needs user action */
if (git_repository_is_bare(repo))
return report_error("Local and remote have diverged, merge of bare branch needed");
/* Merging will definitely need the head branch too */
if (git_branch_is_head(local) != 1)
return report_error("Local and remote do not match, local branch not HEAD - cannot update");
/*
* Some day we migth try a clean merge here.
*
* But I couldn't find any good examples of this, so for now
* you'd need to merge divergent histories manually. But we've
* at least verified above that we have a working tree and the
* current branch is checked out and clean, so we *could* try
* to merge.
*/
return report_error("Local and remote have diverged, need to merge");
}
void test_refs_branches_ishead__can_properly_handle_orphaned_HEAD(void)
{
git_repository_free(repo);
repo = cl_git_sandbox_init("testrepo.git");
make_head_orphaned(repo, NON_EXISTING_HEAD);
cl_git_pass(git_reference_lookup(&branch, repo, "refs/heads/master"));
cl_assert_equal_i(false, git_branch_is_head(branch));
cl_git_sandbox_cleanup();
repo = NULL;
}
PyObject *
Branch_is_head(Branch *self)
{
int err;
CHECK_REFERENCE(self);
err = git_branch_is_head(self->reference);
if (err == 1)
Py_RETURN_TRUE;
else if (err == 0)
Py_RETURN_FALSE;
else
return Error_set(err);
}
/**
* ggit_branch_is_head:
* @branch: a #GgitBranch.
* @error: a #GError for error reporting, or %NULL.
*
* Determines if the current local branch is pointed at by HEAD.
*
* Returns: %TRUE if the current local branch is pointed at by HEAD.
*/
gboolean
ggit_branch_is_head (GgitBranch *branch,
GError **error)
{
gint ret;
g_return_val_if_fail (GGIT_IS_BRANCH (branch), FALSE);
ret = git_branch_is_head (_ggit_native_get (branch));
if (ret < 0)
{
_ggit_error_set (error, ret);
}
return (ret == 1);
}
int git_reference_rename(
git_reference **out,
git_reference *ref,
const char *new_name,
int force)
{
unsigned int normalization_flags;
char normalized[GIT_REFNAME_MAX];
bool should_head_be_updated = false;
int error = 0;
int reference_has_log;
normalization_flags = ref->type == GIT_REF_SYMBOLIC ?
GIT_REF_FORMAT_ALLOW_ONELEVEL : GIT_REF_FORMAT_NORMAL;
if ((error = git_reference_normalize_name(
normalized, sizeof(normalized), new_name, normalization_flags)) < 0)
return error;
/* Check if we have to update HEAD. */
if ((error = git_branch_is_head(ref)) < 0)
return error;
should_head_be_updated = (error > 0);
if ((error = git_refdb_rename(out, ref->db, ref->name, new_name, force)) < 0)
return error;
/* Update HEAD it was poiting to the reference being renamed. */
if (should_head_be_updated &&
(error = git_repository_set_head(ref->db->repo, new_name)) < 0) {
giterr_set(GITERR_REFERENCE, "Failed to update HEAD after renaming reference");
return error;
}
/* Rename the reflog file, if it exists. */
reference_has_log = git_reference_has_log(ref);
if (reference_has_log < 0)
return reference_has_log;
if (reference_has_log && (error = git_reflog_rename(git_reference_owner(ref), git_reference_name(ref), new_name)) < 0)
return error;
return 0;
}
void test_refs_branches_create__cannot_force_create_over_current_branch(void)
{
const git_oid *oid;
git_reference *branch2;
retrieve_known_commit(&target, repo);
cl_git_pass(git_branch_lookup(&branch2, repo, "master", GIT_BRANCH_LOCAL));
cl_assert_equal_s("refs/heads/master", git_reference_name(branch2));
cl_assert_equal_i(true, git_branch_is_head(branch2));
oid = git_reference_target(branch2);
cl_git_fail_with(-1, git_branch_create(&branch, repo, "master", target, 1, NULL, NULL));
branch = NULL;
cl_git_pass(git_branch_lookup(&branch, repo, "master", GIT_BRANCH_LOCAL));
cl_assert_equal_s("refs/heads/master", git_reference_name(branch));
cl_git_pass(git_oid_cmp(git_reference_target(branch), oid));
git_reference_free(branch2);
}
/*
* The remote is strictly newer than the local branch.
*/
static int reset_to_remote(git_repository *repo, git_reference *local, const git_oid *new_id)
{
git_checkout_options opts = GIT_CHECKOUT_OPTIONS_INIT;
opts.progress_cb = &progress_cb;
git_object *target;
if (verbose)
fprintf(stderr, "git storage: reset to remote\n");
// If it's not checked out (bare or not HEAD), just update the reference */
if (git_repository_is_bare(repo) || git_branch_is_head(local) != 1) {
git_reference *out;
if (git_reference_set_target(&out, local, new_id, "Update to remote"))
return report_error(translate("gettextFromC", "Could not update local cache to newer remote data"));
git_reference_free(out);
#ifdef DEBUG
// Not really an error, just informational
report_error("Updated local branch from remote");
#endif
return 0;
}
if (git_object_lookup(&target, repo, new_id, GIT_OBJ_COMMIT)) {
if (is_subsurface_cloud)
return report_error(translate("gettextFromC", "Subsurface cloud storage corrupted"));
else
return report_error("Could not look up remote commit");
}
opts.checkout_strategy = GIT_CHECKOUT_SAFE;
if (git_reset(repo, target, GIT_RESET_HARD, &opts)) {
if (is_subsurface_cloud)
return report_error(translate("gettextFromC", "Could not update local cache to newer remote data"));
else
return report_error("Local head checkout failed after update");
}
// Not really an error, just informational
#ifdef DEBUG
report_error("Updated local information from remote");
#endif
return 0;
}
static int try_to_update(git_repository *repo, git_remote *origin, git_reference *local, git_reference *remote, enum remote_transport rt)
{
git_oid base;
const git_oid *local_id, *remote_id;
if (!git_reference_cmp(local, remote))
return 0;
// Dirty modified state in the working tree? We're not going
// to update either way
if (git_status_foreach(repo, check_clean, NULL))
return report_error("local cached copy is dirty, skipping update");
local_id = git_reference_target(local);
remote_id = git_reference_target(remote);
if (!local_id || !remote_id)
return report_error("Unable to get local or remote SHA1");
if (git_merge_base(&base, repo, local_id, remote_id))
return report_error("Unable to find common commit of local and remote branches");
/* Is the remote strictly newer? Use it */
if (git_oid_equal(&base, local_id))
return reset_to_remote(repo, local, remote_id);
/* Is the local repo the more recent one? See if we can update upstream */
if (git_oid_equal(&base, remote_id))
return update_remote(repo, origin, local, remote, rt);
/* Merging a bare repository always needs user action */
if (git_repository_is_bare(repo))
return report_error("Local and remote have diverged, merge of bare branch needed");
/* Merging will definitely need the head branch too */
if (git_branch_is_head(local) != 1)
return report_error("Local and remote do not match, local branch not HEAD - cannot update");
/* Ok, let's try to merge these */
return try_to_git_merge(repo, local, remote, &base, local_id, remote_id);
}
int git_branch_delete(git_reference *branch)
{
int is_head;
git_buf config_section = GIT_BUF_INIT;
int error = -1;
assert(branch);
if (!git_reference_is_branch(branch) &&
!git_reference_is_remote(branch)) {
giterr_set(GITERR_INVALID, "Reference '%s' is not a valid branch.", git_reference_name(branch));
return -1;
}
if ((is_head = git_branch_is_head(branch)) < 0)
return is_head;
if (is_head) {
giterr_set(GITERR_REFERENCE,
"Cannot delete branch '%s' as it is the current HEAD of the repository.", git_reference_name(branch));
return -1;
}
if (git_buf_printf(&config_section, "branch.%s", git_reference_name(branch) + strlen(GIT_REFS_HEADS_DIR)) < 0)
goto on_error;
if (git_config_rename_section(
git_reference_owner(branch),
git_buf_cstr(&config_section),
NULL) < 0)
goto on_error;
if (git_reference_delete(branch) < 0)
goto on_error;
error = 0;
on_error:
git_buf_free(&config_section);
return error;
}
static int reference__rename(git_reference **out, git_reference *ref, const char *new_name, int force,
const git_signature *signature, const char *message)
{
git_repository *repo;
git_refname_t normalized;
bool should_head_be_updated = false;
int error = 0;
assert(ref && new_name && signature);
repo = git_reference_owner(ref);
if ((error = reference_normalize_for_repo(
normalized, repo, new_name, true)) < 0)
return error;
/* Check if we have to update HEAD. */
if ((error = git_branch_is_head(ref)) < 0)
return error;
should_head_be_updated = (error > 0);
if ((error = git_refdb_rename(out, ref->db, ref->name, normalized, force, signature, message)) < 0)
return error;
/* Update HEAD if it was pointing to the reference being renamed */
if (should_head_be_updated) {
error = git_repository_set_head(ref->db->repo, normalized);
} else {
rename_cb_data payload;
payload.old_name = ref->name;
memcpy(&payload.new_name, &normalized, sizeof(normalized));
error = git_repository_foreach_head(repo, update_wt_heads, &payload);
}
return error;
}
/*
* call-seq:
* branch.head? -> true or false
*
* Returns +true+ if the branch is pointed at by +HEAD+, +false+ otherwise.
*/
static VALUE rb_git_branch_head_p(VALUE self)
{
git_reference *branch;
Data_Get_Struct(self, git_reference, branch);
return git_branch_is_head(branch) ? Qtrue : Qfalse;
}
bool Branch::isHead()const
{
return git_branch_is_head(data()) != 0;
}
void test_refs_branches_ishead__can_tell_if_a_branch_is_not_pointed_at_by_HEAD(void)
{
cl_git_pass(git_reference_lookup(&branch, repo, "refs/heads/br2"));
cl_assert_equal_i(false, git_branch_is_head(branch));
}
bool Masterlist::Update(const boost::filesystem::path& path, const std::string& repoUrl, const std::string& repoBranch) {
GitHelper git;
fs::path repoPath = path.parent_path();
string filename = path.filename().string();
if (repoUrl.empty() || repoBranch.empty())
throw std::invalid_argument("Repository URL and branch must not be empty.");
// Initialise checkout options.
BOOST_LOG_TRIVIAL(debug) << "Setting up checkout options.";
char * paths = new char[filename.length() + 1];
strcpy(paths, filename.c_str());
git.GetData().checkout_options.checkout_strategy = GIT_CHECKOUT_FORCE | GIT_CHECKOUT_DONT_REMOVE_EXISTING;
git.GetData().checkout_options.paths.strings = &paths;
git.GetData().checkout_options.paths.count = 1;
// Initialise clone options.
git.GetData().clone_options.checkout_opts = git.GetData().checkout_options;
git.GetData().clone_options.bare = 0;
git.GetData().clone_options.checkout_branch = repoBranch.c_str();
// Now try to access the repository if it exists, or clone one if it doesn't.
BOOST_LOG_TRIVIAL(trace) << "Attempting to open the Git repository at: " << repoPath;
if (!git.IsRepository(repoPath))
git.Clone(repoPath, repoUrl);
else {
// Repository exists: check settings are correct, then pull updates.
git.SetErrorMessage((boost::format(translate("An error occurred while trying to access the local masterlist repository. If this error happens again, try deleting the \".git\" folder in %1%.")) % repoPath.string()).str());
// Open the repository.
BOOST_LOG_TRIVIAL(info) << "Existing repository found, attempting to open it.";
git.Call(git_repository_open(&git.GetData().repo, repoPath.string().c_str()));
// Set the remote URL.
BOOST_LOG_TRIVIAL(info) << "Using remote URL: " << repoUrl;
git.Call(git_remote_set_url(git.GetData().repo, "origin", repoUrl.c_str()));
// Now fetch updates from the remote.
git.Fetch("origin");
// Check that a local branch with the correct name exists.
git.SetErrorMessage((boost::format(translate("An error occurred while trying to access the local masterlist repository. If this error happens again, try deleting the \".git\" folder in %1%.")) % repoPath.string()).str());
int ret = git_branch_lookup(&git.GetData().reference, git.GetData().repo, repoBranch.c_str(), GIT_BRANCH_LOCAL);
if (ret == GIT_ENOTFOUND)
// Branch doesn't exist. Create a new branch using the remote branch's latest commit.
git.CheckoutNewBranch("origin", repoBranch);
else {
// The local branch exists. Need to merge the remote branch
// into it.
git.Call(ret); // Handle other errors from preceding branch lookup.
// Check if HEAD points to the desired branch and set it to if not.
if (!git_branch_is_head(git.GetData().reference)) {
BOOST_LOG_TRIVIAL(trace) << "Setting HEAD to follow branch: " << repoBranch;
git.Call(git_repository_set_head(git.GetData().repo, (string("refs/heads/") + repoBranch).c_str()));
}
// Get remote branch reference.
git.Call(git_branch_upstream(&git.GetData().reference2, git.GetData().reference));
BOOST_LOG_TRIVIAL(trace) << "Checking HEAD and remote branch's mergeability.";
git_merge_analysis_t analysis;
git_merge_preference_t pref;
git.Call(git_annotated_commit_from_ref(&git.GetData().annotated_commit, git.GetData().repo, git.GetData().reference2));
git.Call(git_merge_analysis(&analysis, &pref, git.GetData().repo, (const git_annotated_commit **)&git.GetData().annotated_commit, 1));
if ((analysis & GIT_MERGE_ANALYSIS_FASTFORWARD) == 0 && (analysis & GIT_MERGE_ANALYSIS_UP_TO_DATE) == 0) {
// The local branch can't be easily merged. Best just to delete and recreate it.
BOOST_LOG_TRIVIAL(trace) << "Local branch cannot be easily merged with remote branch.";
BOOST_LOG_TRIVIAL(trace) << "Deleting the local branch.";
git.Call(git_branch_delete(git.GetData().reference));
// Need to free ref before calling git.CheckoutNewBranch()
git_reference_free(git.GetData().reference);
git.GetData().reference = nullptr;
git_reference_free(git.GetData().reference2);
git.GetData().reference2 = nullptr;
git.CheckoutNewBranch("origin", repoBranch);
} else {
// Get remote branch commit ID.
git.Call(git_reference_peel(&git.GetData().object, git.GetData().reference2, GIT_OBJ_COMMIT));
const git_oid * remote_commit_id = git_object_id(git.GetData().object);
git_object_free(git.GetData().object);
git.GetData().object = nullptr;
git_reference_free(git.GetData().reference2);
git.GetData().reference2 = nullptr;
bool updateBranchHead = true;
if ((analysis & GIT_MERGE_ANALYSIS_UP_TO_DATE) != 0) {
// No merge is required, but HEAD might be ahead of the remote branch. Check
// to see if that's the case, and move HEAD back to match the remote branch
// if so.
BOOST_LOG_TRIVIAL(trace) << "Local branch is up-to-date with remote branch.";
BOOST_LOG_TRIVIAL(trace) << "Checking to see if local and remote branch heads are equal.";
// Get local branch commit ID.
git.Call(git_reference_peel(&git.GetData().object, git.GetData().reference, GIT_OBJ_COMMIT));
const git_oid * local_commit_id = git_object_id(git.GetData().object);
git_object_free(git.GetData().object);
git.GetData().object = nullptr;
updateBranchHead = local_commit_id->id != remote_commit_id->id;
// If the masterlist in
// HEAD also matches the masterlist file, no further
// action needs to be taken. Otherwise, a checkout
// must be performed and the checked-out file parsed.
if (!updateBranchHead) {
BOOST_LOG_TRIVIAL(trace) << "Local and remote branch heads are equal.";
if (!GitHelper::IsFileDifferent(repoPath, filename)) {
BOOST_LOG_TRIVIAL(info) << "Local branch and masterlist file are already up to date.";
return false;
}
} else
BOOST_LOG_TRIVIAL(trace) << "Local branch heads is ahead of remote branch head.";
} else
BOOST_LOG_TRIVIAL(trace) << "Local branch can be fast-forwarded to remote branch.";
if (updateBranchHead) {
// The remote branch reference points to a particular
// commit. Update the local branch reference to point
// to the same commit.
BOOST_LOG_TRIVIAL(trace) << "Syncing local branch head with remote branch head.";
git.Call(git_reference_set_target(&git.GetData().reference2, git.GetData().reference, remote_commit_id, "Setting branch reference."));
git_reference_free(git.GetData().reference2);
git.GetData().reference2 = nullptr;
}
git_reference_free(git.GetData().reference);
git.GetData().reference = nullptr;
BOOST_LOG_TRIVIAL(trace) << "Performing a Git checkout of HEAD.";
git.Call(git_checkout_head(git.GetData().repo, &git.GetData().checkout_options));
}
}
}
// Now whether the repository was cloned or updated, the working directory contains
// the latest masterlist. Try parsing it: on failure, detach the HEAD back one commit
// and try again.
bool parsingFailed = false;
std::string parsingError;
git.SetErrorMessage((boost::format(translate("An error occurred while trying to read information on the updated masterlist. If this error happens again, try deleting the \".git\" folder in %1%.")) % repoPath.string()).str());
do {
// Get the HEAD revision's short ID.
string revision = git.GetHeadShortId();
//Now try parsing the masterlist.
BOOST_LOG_TRIVIAL(debug) << "Testing masterlist parsing.";
try {
this->Load(path);
parsingFailed = false;
} catch (std::exception& e) {
parsingFailed = true;
if (parsingError.empty())
parsingError = boost::locale::translate("Masterlist revision").str() +
" " + string(revision) +
": " + e.what() +
". " +
boost::locale::translate("The latest masterlist revision contains a syntax error, LOOT is using the most recent valid revision instead. Syntax errors are usually minor and fixed within hours.").str();
//There was an error, roll back one revision.
BOOST_LOG_TRIVIAL(error) << "Masterlist parsing failed. Masterlist revision " + string(revision) + ": " + e.what();
git.CheckoutRevision("HEAD^");
}
} while (parsingFailed);
if (!parsingError.empty())
AppendMessage(Message(MessageType::error, parsingError));
return true;
}
void test_refs_branches_ishead__wont_be_fooled_by_a_non_branch(void)
{
cl_git_pass(git_reference_lookup(&branch, repo, "refs/tags/e90810b"));
cl_assert_equal_i(false, git_branch_is_head(branch));
}
static int try_to_git_merge(git_repository *repo, git_reference *local, git_reference *remote, git_oid *base, const git_oid *local_id, const git_oid *remote_id)
{
git_tree *local_tree, *remote_tree, *base_tree;
git_commit *local_commit, *remote_commit, *base_commit;
git_index *merged_index;
git_merge_options merge_options;
if (verbose) {
char outlocal[41], outremote[41];
outlocal[40] = outremote[40] = 0;
git_oid_fmt(outlocal, local_id);
git_oid_fmt(outremote, remote_id);
fprintf(stderr, "trying to merge local SHA %s remote SHA %s\n", outlocal, outremote);
}
git_merge_init_options(&merge_options, GIT_MERGE_OPTIONS_VERSION);
#ifdef USE_LIBGIT23_API
merge_options.tree_flags = GIT_MERGE_TREE_FIND_RENAMES;
#else
merge_options.flags = GIT_MERGE_TREE_FIND_RENAMES;
#endif
merge_options.file_favor = GIT_MERGE_FILE_FAVOR_UNION;
merge_options.rename_threshold = 100;
if (git_commit_lookup(&local_commit, repo, local_id))
return report_error(translate("gettextFromC", "Remote storage and local data diverged. Error: can't get commit (%s)"), giterr_last()->message);
if (git_commit_tree(&local_tree, local_commit))
return report_error(translate("gettextFromC", "Remote storage and local data diverged. Error: failed local tree lookup (%s)"), giterr_last()->message);
if (git_commit_lookup(&remote_commit, repo, remote_id))
return report_error(translate("gettextFromC", "Remote storage and local data diverged. Error: can't get commit (%s)"), giterr_last()->message);
if (git_commit_tree(&remote_tree, remote_commit))
return report_error(translate("gettextFromC", "Remote storage and local data diverged. Error: failed remote tree lookup (%s)"), giterr_last()->message);
if (git_commit_lookup(&base_commit, repo, base))
return report_error(translate("gettextFromC", "Remote storage and local data diverged. Error: can't get commit: (%s)"), giterr_last()->message);
if (git_commit_tree(&base_tree, base_commit))
return report_error(translate("gettextFromC", "Remote storage and local data diverged. Error: failed base tree lookup: (%s)"), giterr_last()->message);
if (git_merge_trees(&merged_index, repo, base_tree, local_tree, remote_tree, &merge_options))
return report_error(translate("gettextFromC", "Remote storage and local data diverged. Error: merge failed (%s)"), giterr_last()->message);
if (git_index_has_conflicts(merged_index)) {
int error;
const git_index_entry *ancestor = NULL,
*ours = NULL,
*theirs = NULL;
git_index_conflict_iterator *iter = NULL;
error = git_index_conflict_iterator_new(&iter, merged_index);
while (git_index_conflict_next(&ancestor, &ours, &theirs, iter)
!= GIT_ITEROVER) {
/* Mark this conflict as resolved */
fprintf(stderr, "conflict in %s / %s / %s -- ",
ours ? ours->path : "-",
theirs ? theirs->path : "-",
ancestor ? ancestor->path : "-");
if ((!ours && theirs && ancestor) ||
(ours && !theirs && ancestor)) {
// the file was removed on one side or the other - just remove it
fprintf(stderr, "looks like a delete on one side; removing the file from the index\n");
error = git_index_remove(merged_index, ours ? ours->path : theirs->path, GIT_INDEX_STAGE_ANY);
} else {
error = git_index_conflict_remove(merged_index, ours ? ours->path : theirs ? theirs->path : ancestor->path);
}
if (error) {
fprintf(stderr, "error at conflict resplution (%s)", giterr_last()->message);
}
}
git_index_conflict_cleanup(merged_index);
git_index_conflict_iterator_free(iter);
report_error(translate("gettextFromC", "Remote storage and local data diverged. Error: merge conflict - manual intervention needed"));
}
git_oid merge_oid, commit_oid;
git_tree *merged_tree;
git_signature *author;
git_commit *commit;
if (git_index_write_tree_to(&merge_oid, merged_index, repo))
return report_error(translate("gettextFromC", "Remote storage and local data diverged. Error: writing the tree failed (%s)"), giterr_last()->message);
if (git_tree_lookup(&merged_tree, repo, &merge_oid))
return report_error(translate("gettextFromC", "Remote storage and local data diverged. Error: tree lookup failed (%s)"), giterr_last()->message);
if (git_signature_default(&author, repo) < 0)
return report_error(translate("gettextFromC", "Failed to get author: (%s)"), giterr_last()->message);
if (git_commit_create_v(&commit_oid, repo, NULL, author, author, NULL, "automatic merge", merged_tree, 2, local_commit, remote_commit))
return report_error(translate("gettextFromC", "Remote storage and local data diverged. Error: git commit create failed (%s)"), giterr_last()->message);
if (git_commit_lookup(&commit, repo, &commit_oid))
return report_error(translate("gettextFromC", "Error: could not lookup the merge commit I just created (%s)"), giterr_last()->message);
if (git_branch_is_head(local) && !git_repository_is_bare(repo)) {
git_object *parent;
git_reference_peel(&parent, local, GIT_OBJ_COMMIT);
if (update_git_checkout(repo, parent, merged_tree)) {
report_error("Warning: checked out branch is inconsistent with git data");
}
}
if (git_reference_set_target(&local, local, &commit_oid, "Subsurface merge event"))
return report_error("Error: failed to update branch (%s)", giterr_last()->message);
set_git_id(&commit_oid);
git_signature_free(author);
return 0;
}
static int try_to_update(git_repository *repo, git_remote *origin, git_reference *local, git_reference *remote,
const char *remote_url, const char *branch, enum remote_transport rt)
{
git_oid base;
const git_oid *local_id, *remote_id;
int ret = 0;
if (verbose)
fprintf(stderr, "git storage: try to update\n");
if (!git_reference_cmp(local, remote))
return 0;
// Dirty modified state in the working tree? We're not going
// to update either way
if (git_status_foreach(repo, check_clean, NULL)) {
if (is_subsurface_cloud)
goto cloud_data_error;
else
return report_error("local cached copy is dirty, skipping update");
}
local_id = git_reference_target(local);
remote_id = git_reference_target(remote);
if (!local_id || !remote_id) {
if (is_subsurface_cloud)
goto cloud_data_error;
else
return report_error("Unable to get local or remote SHA1");
}
if (git_merge_base(&base, repo, local_id, remote_id)) {
// TODO:
// if they have no merge base, they actually are different repos
// so instead merge this as merging a commit into a repo - git_merge() appears to do that
// but needs testing and cleanup afterwards
//
if (is_subsurface_cloud)
goto cloud_data_error;
else
return report_error("Unable to find common commit of local and remote branches");
}
/* Is the remote strictly newer? Use it */
if (git_oid_equal(&base, local_id)) {
git_storage_update_progress(translate("gettextFromC", "Update local storage to match cloud storage"));
return reset_to_remote(repo, local, remote_id);
}
/* Is the local repo the more recent one? See if we can update upstream */
if (git_oid_equal(&base, remote_id)) {
if (verbose)
fprintf(stderr, "local is newer than remote, update remote\n");
git_storage_update_progress(translate("gettextFromC", "Push local changes to cloud storage"));
return update_remote(repo, origin, local, remote, rt);
}
/* Merging a bare repository always needs user action */
if (git_repository_is_bare(repo)) {
if (is_subsurface_cloud)
goto cloud_data_error;
else
return report_error("Local and remote have diverged, merge of bare branch needed");
}
/* Merging will definitely need the head branch too */
if (git_branch_is_head(local) != 1) {
if (is_subsurface_cloud)
goto cloud_data_error;
else
return report_error("Local and remote do not match, local branch not HEAD - cannot update");
}
/* Ok, let's try to merge these */
git_storage_update_progress(translate("gettextFromC", "Try to merge local changes into cloud storage"));
ret = try_to_git_merge(repo, &local, remote, &base, local_id, remote_id);
if (ret == 0)
return update_remote(repo, origin, local, remote, rt);
else
return ret;
cloud_data_error:
// since we are working with Subsurface cloud storage we want to make the user interaction
// as painless as possible. So if something went wrong with the local cache, tell the user
// about it an move it away
return cleanup_local_cache(remote_url, branch);
}
static int try_to_git_merge(git_repository *repo, git_reference **local_p, git_reference *remote, git_oid *base, const git_oid *local_id, const git_oid *remote_id)
{
UNUSED(remote);
git_tree *local_tree, *remote_tree, *base_tree;
git_commit *local_commit, *remote_commit, *base_commit;
git_index *merged_index;
git_merge_options merge_options;
if (verbose) {
char outlocal[41], outremote[41];
outlocal[40] = outremote[40] = 0;
git_oid_fmt(outlocal, local_id);
git_oid_fmt(outremote, remote_id);
fprintf(stderr, "trying to merge local SHA %s remote SHA %s\n", outlocal, outremote);
}
git_merge_init_options(&merge_options, GIT_MERGE_OPTIONS_VERSION);
#if !LIBGIT2_VER_MAJOR && LIBGIT2_VER_MINOR > 23
merge_options.flags = GIT_MERGE_FIND_RENAMES;
#else
merge_options.tree_flags = GIT_MERGE_TREE_FIND_RENAMES;
#endif
merge_options.file_favor = GIT_MERGE_FILE_FAVOR_UNION;
merge_options.rename_threshold = 100;
if (git_commit_lookup(&local_commit, repo, local_id)) {
fprintf(stderr, "Remote storage and local data diverged. Error: can't get commit (%s)", giterr_last()->message);
goto diverged_error;
}
if (git_commit_tree(&local_tree, local_commit)) {
fprintf(stderr, "Remote storage and local data diverged. Error: failed local tree lookup (%s)", giterr_last()->message);
goto diverged_error;
}
if (git_commit_lookup(&remote_commit, repo, remote_id)) {
fprintf(stderr, "Remote storage and local data diverged. Error: can't get commit (%s)", giterr_last()->message);
goto diverged_error;
}
if (git_commit_tree(&remote_tree, remote_commit)) {
fprintf(stderr, "Remote storage and local data diverged. Error: failed local tree lookup (%s)", giterr_last()->message);
goto diverged_error;
}
if (git_commit_lookup(&base_commit, repo, base)) {
fprintf(stderr, "Remote storage and local data diverged. Error: can't get commit (%s)", giterr_last()->message);
goto diverged_error;
}
if (git_commit_tree(&base_tree, base_commit)) {
fprintf(stderr, "Remote storage and local data diverged. Error: failed base tree lookup (%s)", giterr_last()->message);
goto diverged_error;
}
if (git_merge_trees(&merged_index, repo, base_tree, local_tree, remote_tree, &merge_options)) {
fprintf(stderr, "Remote storage and local data diverged. Error: merge failed (%s)", giterr_last()->message);
// this is the one where I want to report more detail to the user - can't quite explain why
return report_error(translate("gettextFromC", "Remote storage and local data diverged. Error: merge failed (%s)"), giterr_last()->message);
}
if (git_index_has_conflicts(merged_index)) {
int error;
const git_index_entry *ancestor = NULL,
*ours = NULL,
*theirs = NULL;
git_index_conflict_iterator *iter = NULL;
error = git_index_conflict_iterator_new(&iter, merged_index);
while (git_index_conflict_next(&ancestor, &ours, &theirs, iter)
!= GIT_ITEROVER) {
/* Mark this conflict as resolved */
fprintf(stderr, "conflict in %s / %s / %s -- ",
ours ? ours->path : "-",
theirs ? theirs->path : "-",
ancestor ? ancestor->path : "-");
if ((!ours && theirs && ancestor) ||
(ours && !theirs && ancestor)) {
// the file was removed on one side or the other - just remove it
fprintf(stderr, "looks like a delete on one side; removing the file from the index\n");
error = git_index_remove(merged_index, ours ? ours->path : theirs->path, GIT_INDEX_STAGE_ANY);
} else if (ancestor) {
error = git_index_conflict_remove(merged_index, ours ? ours->path : theirs ? theirs->path : ancestor->path);
}
if (error) {
fprintf(stderr, "error at conflict resplution (%s)", giterr_last()->message);
}
}
git_index_conflict_cleanup(merged_index);
git_index_conflict_iterator_free(iter);
report_error(translate("gettextFromC", "Remote storage and local data diverged. Cannot combine local and remote changes"));
}
git_oid merge_oid, commit_oid;
git_tree *merged_tree;
git_signature *author;
git_commit *commit;
if (git_index_write_tree_to(&merge_oid, merged_index, repo))
goto write_error;
if (git_tree_lookup(&merged_tree, repo, &merge_oid))
goto write_error;
if (git_signature_default(&author, repo) < 0)
if (git_signature_now(&author, "Subsurface", "noemail@given") < 0)
goto write_error;
if (git_commit_create_v(&commit_oid, repo, NULL, author, author, NULL, "automatic merge", merged_tree, 2, local_commit, remote_commit))
goto write_error;
if (git_commit_lookup(&commit, repo, &commit_oid))
goto write_error;
if (git_branch_is_head(*local_p) && !git_repository_is_bare(repo)) {
git_object *parent;
git_reference_peel(&parent, *local_p, GIT_OBJ_COMMIT);
if (update_git_checkout(repo, parent, merged_tree)) {
goto write_error;
}
}
if (git_reference_set_target(local_p, *local_p, &commit_oid, "Subsurface merge event"))
goto write_error;
set_git_id(&commit_oid);
git_signature_free(author);
if (verbose)
fprintf(stderr, "Successfully merged repositories");
return 0;
diverged_error:
return report_error(translate("gettextFromC", "Remote storage and local data diverged"));
write_error:
return report_error(translate("gettextFromC", "Remote storage and local data diverged. Error: writing the data failed (%s)"), giterr_last()->message);
}