static char *find_linked_symref(const char *symref, const char *branch,
const char *id)
{
struct strbuf sb = STRBUF_INIT;
struct strbuf path = STRBUF_INIT;
struct strbuf gitdir = STRBUF_INIT;
char *existing = NULL;
/*
* $GIT_COMMON_DIR/$symref (e.g. HEAD) is practically outside
* $GIT_DIR so resolve_ref_unsafe() won't work (it uses
* git_path). Parse the ref ourselves.
*/
if (id)
strbuf_addf(&path, "%s/worktrees/%s/%s", get_git_common_dir(), id, symref);
else
strbuf_addf(&path, "%s/%s", get_git_common_dir(), symref);
if (!strbuf_readlink(&sb, path.buf, 0)) {
if (!starts_with(sb.buf, "refs/") ||
check_refname_format(sb.buf, 0))
goto done;
} else if (strbuf_read_file(&sb, path.buf, 0) >= 0 &&
starts_with(sb.buf, "ref:")) {
strbuf_remove(&sb, 0, strlen("ref:"));
strbuf_trim(&sb);
} else
goto done;
if (strcmp(sb.buf, branch))
goto done;
if (id) {
strbuf_reset(&path);
strbuf_addf(&path, "%s/worktrees/%s/gitdir", get_git_common_dir(), id);
if (strbuf_read_file(&gitdir, path.buf, 0) <= 0)
goto done;
strbuf_rtrim(&gitdir);
} else
strbuf_addstr(&gitdir, get_git_common_dir());
strbuf_strip_suffix(&gitdir, ".git");
existing = strbuf_detach(&gitdir, NULL);
done:
strbuf_release(&path);
strbuf_release(&sb);
strbuf_release(&gitdir);
return existing;
}
/*
* path contains a path that might be a symlink.
*
* If path is a symlink, attempt to overwrite it with a path to the
* real file or directory (which may or may not exist), following a
* chain of symlinks if necessary. Otherwise, leave path unmodified.
*
* This is a best-effort routine. If an error occurs, path will
* either be left unmodified or will name a different symlink in a
* symlink chain that started with the original path.
*/
static void resolve_symlink(struct strbuf *path)
{
int depth = MAXDEPTH;
static struct strbuf link = STRBUF_INIT;
while (depth--) {
if (strbuf_readlink(&link, path->buf, path->len) < 0)
break;
if (is_absolute_path(link.buf))
/* absolute path simply replaces p */
strbuf_reset(path);
else
/*
* link is a relative path, so replace the
* last element of p with it.
*/
trim_last_path_component(path);
strbuf_addbuf(path, &link);
}
strbuf_reset(&link);
}
/*
* Unconditional writing of a plain regular file is what
* "git difftool --dir-diff" wants to do for symlinks. We are preparing two
* temporary directories to be fed to a Git-unaware tool that knows how to
* show a diff of two directories (e.g. "diff -r A B").
*
* Because the tool is Git-unaware, if a symbolic link appears in either of
* these temporary directories, it will try to dereference and show the
* difference of the target of the symbolic link, which is not what we want,
* as the goal of the dir-diff mode is to produce an output that is logically
* equivalent to what "git diff" produces.
*
* Most importantly, we want to get textual comparison of the result of the
* readlink(2). get_symlink() provides that---it returns the contents of
* the symlink that gets written to a regular file to force the external tool
* to compare the readlink(2) result as text, even on a filesystem that is
* capable of doing a symbolic link.
*/
static char *get_symlink(const struct object_id *oid, const char *path)
{
char *data;
if (is_null_oid(oid)) {
/* The symlink is unknown to Git so read from the filesystem */
struct strbuf link = STRBUF_INIT;
if (has_symlinks) {
if (strbuf_readlink(&link, path, strlen(path)))
die(_("could not read symlink %s"), path);
} else if (strbuf_read_file(&link, path, 128))
die(_("could not read symlink file %s"), path);
data = strbuf_detach(&link, NULL);
} else {
enum object_type type;
unsigned long size;
data = read_sha1_file(oid->hash, &type, &size);
if (!data)
die(_("could not read object %s for symlink %s"),
oid_to_hex(oid), path);
}
return data;
}
/*
* read 'path_to_ref' into 'ref'. Also if is_detached is not NULL,
* set is_detached to 1 (0) if the ref is detached (is not detached).
*
* $GIT_COMMON_DIR/$symref (e.g. HEAD) is practically outside $GIT_DIR so
* for linked worktrees, `resolve_ref_unsafe()` won't work (it uses
* git_path). Parse the ref ourselves.
*
* return -1 if the ref is not a proper ref, 0 otherwise (success)
*/
static int parse_ref(char *path_to_ref, struct strbuf *ref, int *is_detached)
{
if (is_detached)
*is_detached = 0;
if (!strbuf_readlink(ref, path_to_ref, 0)) {
/* HEAD is symbolic link */
if (!starts_with(ref->buf, "refs/") ||
check_refname_format(ref->buf, 0))
return -1;
} else if (strbuf_read_file(ref, path_to_ref, 0) >= 0) {
/* textual symref or detached */
if (!starts_with(ref->buf, "ref:")) {
if (is_detached)
*is_detached = 1;
} else {
strbuf_remove(ref, 0, strlen("ref:"));
strbuf_trim(ref);
if (check_refname_format(ref->buf, 0))
return -1;
}
} else
return -1;
return 0;
}
/*
* Return the real path (i.e., absolute path, with symlinks resolved
* and extra slashes removed) equivalent to the specified path. (If
* you want an absolute path but don't mind links, use
* absolute_path().) The return value is a pointer to a static
* buffer.
*
* The input and all intermediate paths must be shorter than MAX_PATH.
* The directory part of path (i.e., everything up to the last
* dir_sep) must denote a valid, existing directory, but the last
* component need not exist. If die_on_error is set, then die with an
* informative error message if there is a problem. Otherwise, return
* NULL on errors (without generating any output).
*
* If path is our buffer, then return path, as it's already what the
* user wants.
*/
static const char *real_path_internal(const char *path, int die_on_error)
{
static struct strbuf sb = STRBUF_INIT;
char *retval = NULL;
/*
* If we have to temporarily chdir(), store the original CWD
* here so that we can chdir() back to it at the end of the
* function:
*/
struct strbuf cwd = STRBUF_INIT;
int depth = MAXDEPTH;
char *last_elem = NULL;
struct stat st;
/* We've already done it */
if (path == sb.buf)
return path;
if (!*path) {
if (die_on_error)
die("The empty string is not a valid path");
else
goto error_out;
}
strbuf_reset(&sb);
strbuf_addstr(&sb, path);
while (depth--) {
if (!is_directory(sb.buf)) {
char *last_slash = find_last_dir_sep(sb.buf);
if (last_slash) {
last_elem = xstrdup(last_slash + 1);
strbuf_setlen(&sb, last_slash - sb.buf + 1);
} else {
last_elem = xmemdupz(sb.buf, sb.len);
strbuf_reset(&sb);
}
}
if (sb.len) {
if (!cwd.len && strbuf_getcwd(&cwd)) {
if (die_on_error)
die_errno("Could not get current working directory");
else
goto error_out;
}
if (chdir(sb.buf)) {
if (die_on_error)
die_errno("Could not switch to '%s'",
sb.buf);
else
goto error_out;
}
}
if (strbuf_getcwd(&sb)) {
if (die_on_error)
die_errno("Could not get current working directory");
else
goto error_out;
}
if (last_elem) {
if (sb.len && !is_dir_sep(sb.buf[sb.len - 1]))
strbuf_addch(&sb, '/');
strbuf_addstr(&sb, last_elem);
free(last_elem);
last_elem = NULL;
}
if (!lstat(sb.buf, &st) && S_ISLNK(st.st_mode)) {
struct strbuf next_sb = STRBUF_INIT;
ssize_t len = strbuf_readlink(&next_sb, sb.buf, 0);
if (len < 0) {
if (die_on_error)
die_errno("Invalid symlink '%s'",
sb.buf);
else
goto error_out;
}
strbuf_swap(&sb, &next_sb);
strbuf_release(&next_sb);
} else
break;
}
retval = sb.buf;
error_out:
free(last_elem);
if (cwd.len && chdir(cwd.buf))
die_errno("Could not change back to '%s'", cwd.buf);
strbuf_release(&cwd);
return retval;
}
static void copy_templates_1(struct strbuf *path, struct strbuf *template_path,
DIR *dir)
{
size_t path_baselen = path->len;
size_t template_baselen = template_path->len;
struct dirent *de;
/* Note: if ".git/hooks" file exists in the repository being
* re-initialized, /etc/core-git/templates/hooks/update would
* cause "git init" to fail here. I think this is sane but
* it means that the set of templates we ship by default, along
* with the way the namespace under .git/ is organized, should
* be really carefully chosen.
*/
safe_create_dir(path->buf, 1);
while ((de = readdir(dir)) != NULL) {
struct stat st_git, st_template;
int exists = 0;
strbuf_setlen(path, path_baselen);
strbuf_setlen(template_path, template_baselen);
if (de->d_name[0] == '.')
continue;
strbuf_addstr(path, de->d_name);
strbuf_addstr(template_path, de->d_name);
if (lstat(path->buf, &st_git)) {
if (errno != ENOENT)
die_errno(_("cannot stat '%s'"), path->buf);
}
else
exists = 1;
if (lstat(template_path->buf, &st_template))
die_errno(_("cannot stat template '%s'"), template_path->buf);
if (S_ISDIR(st_template.st_mode)) {
DIR *subdir = opendir(template_path->buf);
if (!subdir)
die_errno(_("cannot opendir '%s'"), template_path->buf);
strbuf_addch(path, '/');
strbuf_addch(template_path, '/');
copy_templates_1(path, template_path, subdir);
closedir(subdir);
}
else if (exists)
continue;
else if (S_ISLNK(st_template.st_mode)) {
struct strbuf lnk = STRBUF_INIT;
if (strbuf_readlink(&lnk, template_path->buf,
st_template.st_size) < 0)
die_errno(_("cannot readlink '%s'"), template_path->buf);
if (create_symlink(NULL, lnk.buf, path->buf))
die_errno(_("cannot symlink '%s' '%s'"),
lnk.buf, path->buf);
strbuf_release(&lnk);
}
else if (S_ISREG(st_template.st_mode)) {
if (copy_file(path->buf, template_path->buf, st_template.st_mode))
die_errno(_("cannot copy '%s' to '%s'"),
template_path->buf, path->buf);
}
else
error(_("ignoring template %s"), template_path->buf);
}
}
/*
* 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 void show_patch_diff(struct combine_diff_path *elem, int num_parent,
int dense, struct rev_info *rev)
{
struct diff_options *opt = &rev->diffopt;
unsigned long result_size, cnt, lno;
char *result, *cp;
struct sline *sline; /* survived lines */
int mode_differs = 0;
int i, show_hunks;
int working_tree_file = is_null_sha1(elem->sha1);
int abbrev = DIFF_OPT_TST(opt, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
const char *a_prefix, *b_prefix;
mmfile_t result_file;
context = opt->context;
a_prefix = opt->a_prefix ? opt->a_prefix : "a/";
b_prefix = opt->b_prefix ? opt->b_prefix : "b/";
/* Read the result of merge first */
if (!working_tree_file)
result = grab_blob(elem->sha1, elem->mode, &result_size);
else {
/* Used by diff-tree to read from the working tree */
struct stat st;
int fd = -1;
if (lstat(elem->path, &st) < 0)
goto deleted_file;
if (S_ISLNK(st.st_mode)) {
struct strbuf buf = STRBUF_INIT;
if (strbuf_readlink(&buf, elem->path, st.st_size) < 0) {
error("readlink(%s): %s", elem->path,
strerror(errno));
return;
}
result_size = buf.len;
result = strbuf_detach(&buf, NULL);
elem->mode = canon_mode(st.st_mode);
} else if (S_ISDIR(st.st_mode)) {
unsigned char sha1[20];
if (resolve_gitlink_ref(elem->path, "HEAD", sha1) < 0)
result = grab_blob(elem->sha1, elem->mode, &result_size);
else
result = grab_blob(sha1, elem->mode, &result_size);
} else if (0 <= (fd = open(elem->path, O_RDONLY))) {
size_t len = xsize_t(st.st_size);
ssize_t done;
int is_file, i;
elem->mode = canon_mode(st.st_mode);
/* if symlinks don't work, assume symlink if all parents
* are symlinks
*/
is_file = has_symlinks;
for (i = 0; !is_file && i < num_parent; i++)
is_file = !S_ISLNK(elem->parent[i].mode);
if (!is_file)
elem->mode = canon_mode(S_IFLNK);
result_size = len;
result = xmalloc(len + 1);
done = read_in_full(fd, result, len);
if (done < 0)
die_errno("read error '%s'", elem->path);
else if (done < len)
die("early EOF '%s'", elem->path);
result[len] = 0;
/* If not a fake symlink, apply filters, e.g. autocrlf */
if (is_file) {
struct strbuf buf = STRBUF_INIT;
if (convert_to_git(elem->path, result, len, &buf, safe_crlf)) {
free(result);
result = strbuf_detach(&buf, &len);
result_size = len;
}
}
}
else {
deleted_file:
result_size = 0;
elem->mode = 0;
result = xcalloc(1, 1);
}
if (0 <= fd)
close(fd);
}
for (cnt = 0, cp = result; cp < result + result_size; cp++) {
if (*cp == '\n')
cnt++;
}
if (result_size && result[result_size-1] != '\n')
cnt++; /* incomplete line */
sline = xcalloc(cnt+2, sizeof(*sline));
sline[0].bol = result;
for (lno = 0; lno <= cnt + 1; lno++) {
sline[lno].lost_tail = &sline[lno].lost_head;
sline[lno].flag = 0;
}
for (lno = 0, cp = result; cp < result + result_size; cp++) {
if (*cp == '\n') {
sline[lno].len = cp - sline[lno].bol;
lno++;
if (lno < cnt)
sline[lno].bol = cp + 1;
}
}
if (result_size && result[result_size-1] != '\n')
sline[cnt-1].len = result_size - (sline[cnt-1].bol - result);
result_file.ptr = result;
result_file.size = result_size;
/* Even p_lno[cnt+1] is valid -- that is for the end line number
* for deletion hunk at the end.
*/
sline[0].p_lno = xcalloc((cnt+2) * num_parent, sizeof(unsigned long));
for (lno = 0; lno <= cnt; lno++)
sline[lno+1].p_lno = sline[lno].p_lno + num_parent;
for (i = 0; i < num_parent; i++) {
int j;
for (j = 0; j < i; j++) {
if (!hashcmp(elem->parent[i].sha1,
elem->parent[j].sha1)) {
reuse_combine_diff(sline, cnt, i, j);
break;
}
}
if (i <= j)
combine_diff(elem->parent[i].sha1,
elem->parent[i].mode,
&result_file, sline,
cnt, i, num_parent);
if (elem->parent[i].mode != elem->mode)
mode_differs = 1;
}
show_hunks = make_hunks(sline, cnt, num_parent, dense);
if (show_hunks || mode_differs || working_tree_file) {
const char *abb;
int use_color = DIFF_OPT_TST(opt, COLOR_DIFF);
const char *c_meta = diff_get_color(use_color, DIFF_METAINFO);
const char *c_reset = diff_get_color(use_color, DIFF_RESET);
int added = 0;
int deleted = 0;
if (rev->loginfo && !rev->no_commit_id)
show_log(rev);
dump_quoted_path(dense ? "diff --cc " : "diff --combined ",
"", elem->path, c_meta, c_reset);
printf("%sindex ", c_meta);
for (i = 0; i < num_parent; i++) {
abb = find_unique_abbrev(elem->parent[i].sha1,
abbrev);
printf("%s%s", i ? "," : "", abb);
}
abb = find_unique_abbrev(elem->sha1, abbrev);
printf("..%s%s\n", abb, c_reset);
if (mode_differs) {
deleted = !elem->mode;
/* We say it was added if nobody had it */
added = !deleted;
for (i = 0; added && i < num_parent; i++)
if (elem->parent[i].status !=
DIFF_STATUS_ADDED)
added = 0;
if (added)
printf("%snew file mode %06o",
c_meta, elem->mode);
else {
if (deleted)
printf("%sdeleted file ", c_meta);
printf("mode ");
for (i = 0; i < num_parent; i++) {
printf("%s%06o", i ? "," : "",
elem->parent[i].mode);
}
if (elem->mode)
printf("..%06o", elem->mode);
}
printf("%s\n", c_reset);
}
if (added)
dump_quoted_path("--- ", "", "/dev/null",
c_meta, c_reset);
else
dump_quoted_path("--- ", a_prefix, elem->path,
c_meta, c_reset);
if (deleted)
dump_quoted_path("+++ ", "", "/dev/null",
c_meta, c_reset);
else
dump_quoted_path("+++ ", b_prefix, elem->path,
c_meta, c_reset);
dump_sline(sline, cnt, num_parent,
DIFF_OPT_TST(opt, COLOR_DIFF));
}
free(result);
for (lno = 0; lno < cnt; lno++) {
if (sline[lno].lost_head) {
struct lline *ll = sline[lno].lost_head;
while (ll) {
struct lline *tmp = ll;
ll = ll->next;
free(tmp);
}
}
}
free(sline[0].p_lno);
free(sline);
}
