/* Locate an existing origin or create a new one. */
int git_blame__get_origin(
git_blame__origin **out,
git_blame *blame,
git_commit *commit,
const char *path)
{
git_blame__entry *e;
for (e = blame->ent; e; e = e->next) {
if (e->suspect->commit == commit && !strcmp(e->suspect->path, path)) {
*out = origin_incref(e->suspect);
}
}
return make_origin(out, commit, path);
}
/*
* Locate an existing origin or create a new one.
* This moves the origin to front position in the commit util list.
*/
static struct blame_origin *get_origin(struct commit *commit, const char *path)
{
struct blame_origin *o, *l;
for (o = commit->util, l = NULL; o; l = o, o = o->next) {
if (!strcmp(o->path, path)) {
/* bump to front */
if (l) {
l->next = o->next;
o->next = commit->util;
commit->util = o;
}
return blame_origin_incref(o);
}
}
return make_origin(commit, path);
}
/*
* Prepare a dummy commit that represents the work tree (or staged) item.
* Note that annotating work tree item never works in the reverse.
*/
static struct commit *fake_working_tree_commit(struct diff_options *opt,
const char *path,
const char *contents_from)
{
struct commit *commit;
struct blame_origin *origin;
struct commit_list **parent_tail, *parent;
struct object_id head_oid;
struct strbuf buf = STRBUF_INIT;
const char *ident;
time_t now;
int size, len;
struct cache_entry *ce;
unsigned mode;
struct strbuf msg = STRBUF_INIT;
read_cache();
time(&now);
commit = alloc_commit_node();
commit->object.parsed = 1;
commit->date = now;
parent_tail = &commit->parents;
if (!resolve_ref_unsafe("HEAD", RESOLVE_REF_READING, head_oid.hash, NULL))
die("no such ref: HEAD");
parent_tail = append_parent(parent_tail, &head_oid);
append_merge_parents(parent_tail);
verify_working_tree_path(commit, path);
origin = make_origin(commit, path);
ident = fmt_ident("Not Committed Yet", "not.committed.yet", NULL, 0);
strbuf_addstr(&msg, "tree 0000000000000000000000000000000000000000\n");
for (parent = commit->parents; parent; parent = parent->next)
strbuf_addf(&msg, "parent %s\n",
oid_to_hex(&parent->item->object.oid));
strbuf_addf(&msg,
"author %s\n"
"committer %s\n\n"
"Version of %s from %s\n",
ident, ident, path,
(!contents_from ? path :
(!strcmp(contents_from, "-") ? "standard input" : contents_from)));
set_commit_buffer_from_strbuf(commit, &msg);
if (!contents_from || strcmp("-", contents_from)) {
struct stat st;
const char *read_from;
char *buf_ptr;
unsigned long buf_len;
if (contents_from) {
if (stat(contents_from, &st) < 0)
die_errno("Cannot stat '%s'", contents_from);
read_from = contents_from;
}
else {
if (lstat(path, &st) < 0)
die_errno("Cannot lstat '%s'", path);
read_from = path;
}
mode = canon_mode(st.st_mode);
switch (st.st_mode & S_IFMT) {
case S_IFREG:
if (DIFF_OPT_TST(opt, ALLOW_TEXTCONV) &&
textconv_object(read_from, mode, &null_oid, 0, &buf_ptr, &buf_len))
strbuf_attach(&buf, buf_ptr, buf_len, buf_len + 1);
else if (strbuf_read_file(&buf, read_from, st.st_size) != st.st_size)
die_errno("cannot open or read '%s'", read_from);
break;
case S_IFLNK:
if (strbuf_readlink(&buf, read_from, st.st_size) < 0)
die_errno("cannot readlink '%s'", read_from);
break;
default:
die("unsupported file type %s", read_from);
}
}
else {
/* Reading from stdin */
mode = 0;
if (strbuf_read(&buf, 0, 0) < 0)
die_errno("failed to read from stdin");
}
convert_to_git(path, buf.buf, buf.len, &buf, 0);
origin->file.ptr = buf.buf;
origin->file.size = buf.len;
pretend_sha1_file(buf.buf, buf.len, OBJ_BLOB, origin->blob_oid.hash);
/*
* Read the current index, replace the path entry with
* origin->blob_sha1 without mucking with its mode or type
* bits; we are not going to write this index out -- we just
* want to run "diff-index --cached".
*/
discard_cache();
read_cache();
len = strlen(path);
if (!mode) {
int pos = cache_name_pos(path, len);
if (0 <= pos)
mode = active_cache[pos]->ce_mode;
else
/* Let's not bother reading from HEAD tree */
mode = S_IFREG | 0644;
}
size = cache_entry_size(len);
ce = xcalloc(1, size);
oidcpy(&ce->oid, &origin->blob_oid);
memcpy(ce->name, path, len);
ce->ce_flags = create_ce_flags(0);
ce->ce_namelen = len;
ce->ce_mode = create_ce_mode(mode);
add_cache_entry(ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE);
cache_tree_invalidate_path(&the_index, path);
return commit;
}
static git_blame__origin* find_origin(
git_blame *blame,
git_commit *parent,
git_blame__origin *origin)
{
git_blame__origin *porigin = NULL;
git_diff *difflist = NULL;
git_diff_options diffopts = GIT_DIFF_OPTIONS_INIT;
git_tree *otree=NULL, *ptree=NULL;
/* Get the trees from this commit and its parent */
if (0 != git_commit_tree(&otree, origin->commit) ||
0 != git_commit_tree(&ptree, parent))
goto cleanup;
/* Configure the diff */
diffopts.context_lines = 0;
diffopts.flags = GIT_DIFF_SKIP_BINARY_CHECK;
/* Check to see if files we're interested have changed */
diffopts.pathspec.count = blame->paths.length;
diffopts.pathspec.strings = (char**)blame->paths.contents;
if (0 != git_diff_tree_to_tree(&difflist, blame->repository, ptree, otree, &diffopts))
goto cleanup;
if (!git_diff_num_deltas(difflist)) {
/* No changes; copy data */
git_blame__get_origin(&porigin, blame, parent, origin->path);
} else {
git_diff_find_options findopts = GIT_DIFF_FIND_OPTIONS_INIT;
int i;
/* Generate a full diff between the two trees */
git_diff_free(difflist);
diffopts.pathspec.count = 0;
if (0 != git_diff_tree_to_tree(&difflist, blame->repository, ptree, otree, &diffopts))
goto cleanup;
/* Let diff find renames */
findopts.flags = GIT_DIFF_FIND_RENAMES;
if (0 != git_diff_find_similar(difflist, &findopts))
goto cleanup;
/* Find one that matches */
for (i=0; i<(int)git_diff_num_deltas(difflist); i++) {
const git_diff_delta *delta = git_diff_get_delta(difflist, i);
if (!git_vector_bsearch(NULL, &blame->paths, delta->new_file.path))
{
git_vector_insert_sorted(&blame->paths, (void*)git__strdup(delta->old_file.path),
paths_on_dup);
make_origin(&porigin, parent, delta->old_file.path);
}
}
}
cleanup:
git_diff_free(difflist);
git_tree_free(otree);
git_tree_free(ptree);
return porigin;
}
