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/*
* Copyright (C) 2009-2012 the libgit2 contributors
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "notes.h"
#include "git2.h"
#include "refs.h"
#include "config.h"
#include "iterator.h"
static int find_subtree(git_tree **subtree, const git_oid *root,
git_repository *repo, const char *target, int *fanout)
{
int error;
unsigned int i;
git_tree *tree;
const git_tree_entry *entry;
*subtree = NULL;
error = git_tree_lookup(&tree, repo, root);
if (error < 0)
return error;
for (i=0; i<git_tree_entrycount(tree); i++) {
entry = git_tree_entry_byindex(tree, i);
if (!git__ishex(git_tree_entry_name(entry)))
continue;
/*
* A notes tree follows a strict byte-based progressive fanout
* (i.e. using 2/38, 2/2/36, etc. fanouts, not e.g. 4/36 fanout)
*/
if (S_ISDIR(git_tree_entry_attributes(entry))
&& strlen(git_tree_entry_name(entry)) == 2
&& !strncmp(git_tree_entry_name(entry), target + *fanout, 2)) {
/* found matching subtree - unpack and resume lookup */
git_oid subtree_sha;
git_oid_cpy(&subtree_sha, git_tree_entry_id(entry));
git_tree_free(tree);
*fanout += 2;
return find_subtree(subtree, &subtree_sha, repo,
target, fanout);
}
}
*subtree = tree;
return 0;
}
static int find_blob(git_oid *blob, git_tree *tree, const char *target)
{
unsigned int i;
const git_tree_entry *entry;
for (i=0; i<git_tree_entrycount(tree); i++) {
entry = git_tree_entry_byindex(tree, i);
if (!strcmp(git_tree_entry_name(entry), target)) {
/* found matching note object - return */
git_oid_cpy(blob, git_tree_entry_id(entry));
return 0;
}
}
return GIT_ENOTFOUND;
}
static int note_write(git_oid *out, git_repository *repo,
git_signature *author, git_signature *committer,
const char *notes_ref, const char *note,
const git_oid *tree_sha, const char *target,
int nparents, git_commit **parents)
{
int error, fanout = 0;
git_oid oid;
git_tree *tree = NULL;
git_tree_entry *entry;
git_treebuilder *tb;
/* check for existing notes tree */
if (tree_sha) {
error = find_subtree(&tree, tree_sha, repo, target, &fanout);
if (error < 0)
return error;
error = find_blob(&oid, tree, target + fanout);
if (error != GIT_ENOTFOUND) {
git_tree_free(tree);
if (!error) {
giterr_set(GITERR_REPOSITORY, "Note for '%s' exists already", target);
error = GIT_EEXISTS;
}
return error;
}
}
/* no matching tree entry - add note object to target tree */
error = git_treebuilder_create(&tb, tree);
git_tree_free(tree);
if (error < 0)
return error;
if (!tree_sha)
/* no notes tree yet - create fanout */
fanout += 2;
/* create note object */
error = git_blob_create_frombuffer(&oid, repo, note, strlen(note));
if (error < 0) {
git_treebuilder_free(tb);
return error;
}
error = git_treebuilder_insert(&entry, tb, target + fanout, &oid, 0100644);
if (error < 0) {
/* libgit2 doesn't support object removal (gc) yet */
/* we leave an orphaned blob object behind - TODO */
git_treebuilder_free(tb);
return error;
}
if (out)
git_oid_cpy(out, git_tree_entry_id(entry));
error = git_treebuilder_write(&oid, repo, tb);
git_treebuilder_free(tb);
if (error < 0)
return 0;
if (!tree_sha) {
/* create fanout subtree */
char subtree[3];
strncpy(subtree, target, 2);
subtree[2] = '\0';
error = git_treebuilder_create(&tb, NULL);
if (error < 0)
return error;
error = git_treebuilder_insert(NULL, tb, subtree, &oid, 0040000);
if (error < 0) {
git_treebuilder_free(tb);
return error;
}
error = git_treebuilder_write(&oid, repo, tb);
git_treebuilder_free(tb);
if (error < 0)
return error;
}
/* create new notes commit */
error = git_tree_lookup(&tree, repo, &oid);
if (error < 0)
return error;
error = git_commit_create(&oid, repo, notes_ref, author, committer,
NULL, GIT_NOTES_DEFAULT_MSG_ADD,
tree, nparents, (const git_commit **) parents);
git_tree_free(tree);
return error;
}
static int note_lookup(git_note **out, git_repository *repo,
const git_oid *tree_sha, const char *target)
{
int error, fanout = 0;
git_oid oid;
git_blob *blob;
git_tree *tree;
git_note *note;
error = find_subtree(&tree, tree_sha, repo, target, &fanout);
if (error < 0)
return error;
error = find_blob(&oid, tree, target + fanout);
git_tree_free(tree);
if (error < 0)
return error;
error = git_blob_lookup(&blob, repo, &oid);
if (error < 0)
return error;
note = git__malloc(sizeof(git_note));
GITERR_CHECK_ALLOC(note);
git_oid_cpy(¬e->oid, &oid);
note->message = git__strdup(git_blob_rawcontent(blob));
GITERR_CHECK_ALLOC(note->message);
*out = note;
git_blob_free(blob);
return error;
}
static int note_remove(git_repository *repo,
git_signature *author, git_signature *committer,
const char *notes_ref, const git_oid *tree_sha,
const char *target, int nparents, git_commit **parents)
{
int error, fanout = 0;
git_oid oid;
git_tree *tree;
git_treebuilder *tb;
error = find_subtree(&tree, tree_sha, repo, target, &fanout);
if (error < 0)
return error;
error = find_blob(&oid, tree, target + fanout);
if (!error)
error = git_treebuilder_create(&tb, tree);
git_tree_free(tree);
if (error < 0)
return error;
error = git_treebuilder_remove(tb, target + fanout);
if (!error)
error = git_treebuilder_write(&oid, repo, tb);
git_treebuilder_free(tb);
if (error < 0)
return error;
/* create new notes commit */
error = git_tree_lookup(&tree, repo, &oid);
if (error < 0)
return error;
error = git_commit_create(&oid, repo, notes_ref, author, committer,
NULL, GIT_NOTES_DEFAULT_MSG_RM,
tree, nparents, (const git_commit **) parents);
git_tree_free(tree);
return error;
}
static int note_get_default_ref(const char **out, git_repository *repo)
{
int ret;
git_config *cfg;
*out = NULL;
if (git_repository_config__weakptr(&cfg, repo) < 0)
return -1;
ret = git_config_get_string(cfg, "core.notesRef", out);
if (ret == GIT_ENOTFOUND) {
*out = GIT_NOTES_DEFAULT_REF;
return 0;
}
return ret;
}
static int normalize_namespace(const char **notes_ref, git_repository *repo)
{
if (*notes_ref)
return 0;
return note_get_default_ref(notes_ref, repo);
}
static int retrieve_note_tree_oid(git_oid *tree_oid_out, git_repository *repo, const char *notes_ref)
{
int error = -1;
git_commit *commit = NULL;
git_oid oid;
if ((error = git_reference_name_to_oid(&oid, repo, notes_ref)) < 0)
goto cleanup;
if (git_commit_lookup(&commit, repo, &oid) < 0)
goto cleanup;
git_oid_cpy(tree_oid_out, git_commit_tree_oid(commit));
error = 0;
cleanup:
git_commit_free(commit);
return error;
}
int git_note_read(git_note **out, git_repository *repo,
const char *notes_ref, const git_oid *oid)
{
int error;
char *target;
git_oid sha;
*out = NULL;
if (normalize_namespace(¬es_ref, repo) < 0)
return -1;
if ((error = retrieve_note_tree_oid(&sha, repo, notes_ref)) < 0)
return error;
target = git_oid_allocfmt(oid);
GITERR_CHECK_ALLOC(target);
error = note_lookup(out, repo, &sha, target);
git__free(target);
return error;
}
int git_note_create(
git_oid *out, git_repository *repo,
git_signature *author, git_signature *committer,
const char *notes_ref, const git_oid *oid,
const char *note)
{
int error, nparents = 0;
char *target;
git_oid sha;
git_commit *commit = NULL;
git_reference *ref;
if (normalize_namespace(¬es_ref, repo) < 0)
return -1;
error = git_reference_lookup(&ref, repo, notes_ref);
if (error < 0 && error != GIT_ENOTFOUND)
return error;
if (!error) {
assert(git_reference_type(ref) == GIT_REF_OID);
/* lookup existing notes tree oid */
git_oid_cpy(&sha, git_reference_oid(ref));
git_reference_free(ref);
error = git_commit_lookup(&commit, repo, &sha);
if (error < 0)
return error;
git_oid_cpy(&sha, git_commit_tree_oid(commit));
nparents++;
}
target = git_oid_allocfmt(oid);
GITERR_CHECK_ALLOC(target);
error = note_write(out, repo, author, committer, notes_ref,
note, nparents ? &sha : NULL, target,
nparents, &commit);
git__free(target);
git_commit_free(commit);
return error;
}
int git_note_remove(git_repository *repo, const char *notes_ref,
git_signature *author, git_signature *committer,
const git_oid *oid)
{
int error;
char *target;
git_oid sha;
git_commit *commit;
git_reference *ref;
if (normalize_namespace(¬es_ref, repo) < 0)
return -1;
error = git_reference_lookup(&ref, repo, notes_ref);
if (error < 0)
return error;
assert(git_reference_type(ref) == GIT_REF_OID);
git_oid_cpy(&sha, git_reference_oid(ref));
git_reference_free(ref);
error = git_commit_lookup(&commit, repo, &sha);
if (error < 0)
return error;
git_oid_cpy(&sha, git_commit_tree_oid(commit));
target = git_oid_allocfmt(oid);
GITERR_CHECK_ALLOC(target);
error = note_remove(repo, author, committer, notes_ref,
&sha, target, 1, &commit);
git__free(target);
git_commit_free(commit);
return error;
}
int git_note_default_ref(const char **out, git_repository *repo)
{
assert(repo);
return note_get_default_ref(out, repo);
}
const char * git_note_message(git_note *note)
{
assert(note);
return note->message;
}
const git_oid * git_note_oid(git_note *note)
{
assert(note);
return ¬e->oid;
}
void git_note_free(git_note *note)
{
if (note == NULL)
return;
git__free(note->message);
git__free(note);
}
static int process_entry_path(
const char* entry_path,
git_oid note_oid,
int (*note_cb)(const git_oid *note_oid, const git_oid *annotated_object_oid, void *payload),
void *payload)
{
int i = 0, j = 0, error = -1, len;
bool is_hex_only = true;
git_oid target_oid;
git_buf buf = GIT_BUF_INIT;
if (git_buf_puts(&buf, entry_path) < 0)
goto cleanup;
len = git_buf_len(&buf);
while (i < len) {
if (buf.ptr[i] == '/') {
i++;
continue;
}
if (git__fromhex(buf.ptr[i]) < 0) {
/* This is not a note entry */
error = 0;
goto cleanup;
}
if (i != j)
buf.ptr[j] = buf.ptr[i];
i++;
j++;
}
buf.ptr[j] = '\0';
buf.size = j;
if (j != GIT_OID_HEXSZ) {
/* This is not a note entry */
error = 0;
goto cleanup;
}
if (git_oid_fromstr(&target_oid, buf.ptr) < 0)
return -1;
error = note_cb(¬e_oid, &target_oid, payload);
cleanup:
git_buf_free(&buf);
return error;
}
int git_note_foreach(
git_repository *repo,
const char *notes_ref,
int (*note_cb)(const git_oid *note_oid, const git_oid *annotated_object_oid, void *payload),
void *payload)
{
int error = -1;
unsigned int i;
char *note;
git_oid tree_oid;
git_iterator *iter = NULL;
git_tree *tree = NULL;
git_index_entry *item;
if (normalize_namespace(¬es_ref, repo) < 0)
return -1;
if ((error = retrieve_note_tree_oid(&tree_oid, repo, notes_ref)) < 0)
goto cleanup;
if (git_tree_lookup(&tree, repo, &tree_oid) < 0)
goto cleanup;
if (git_iterator_for_tree(repo, tree, &iter) < 0)
goto cleanup;
if (git_iterator_current(iter, &item) < 0)
goto cleanup;
while (item) {
if (process_entry_path(item->path, item->oid, note_cb, payload) < 0)
goto cleanup;
if (git_iterator_advance(iter, &item) < 0)
goto cleanup;
}
error = 0;
cleanup:
git_iterator_free(iter);
git_tree_free(tree);
return error;
}