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mpv/options/path.c
wm4 86ab4b8a9f path: default ~~ paths to home directory 
The code for expanding the ~~ prefix used mp_find_config_file(), which
strictly looks for _existing_ files in any config path (e.g. not just
the user-local one, but also system-wide config). If no such file
exists, it simply returns NULL, which makes the code below just return
the literal, unexpanded path.

Change this so that it'll resolve the path to the user-local config
directory instead.

Requested in #3591.
2016-09-29 16:44:01 +02:00

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/*
* Get path to config dir/file.
*
* Return Values:
* Returns the pointer to the ALLOCATED buffer containing the
* zero terminated path string. This buffer has to be FREED
* by the caller.
*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include "config.h"
#include "common/common.h"
#include "common/global.h"
#include "common/msg.h"
#include "options/options.h"
#include "options/path.h"
#include "mpv_talloc.h"
#include "osdep/io.h"
#include "osdep/path.h"
// In order of decreasing priority: the first has highest priority.
static const mp_get_platform_path_cb path_resolvers[] = {
#if HAVE_COCOA
mp_get_platform_path_osx,
#endif
#if !defined(_WIN32) || defined(__CYGWIN__)
mp_get_platform_path_unix,
#endif
#if defined(_WIN32)
mp_get_platform_path_win,
#endif
};
// from highest (most preferred) to lowest priority
static const char *const config_dirs[] = {
"home",
"old_home",
"osxbundle",
"global",
};
// Return a platform specific path using a path type as defined in osdep/path.h.
// Keep in mind that the only way to free the return value is freeing talloc_ctx
// (or its children), as this function can return a statically allocated string.
static const char *mp_get_platform_path(void *talloc_ctx,
struct mpv_global *global,
const char *type)
{
assert(talloc_ctx);
const char *force_configdir = getenv("MPV_HOME");
if (global->opts->force_configdir && global->opts->force_configdir[0])
force_configdir = global->opts->force_configdir;
if (!global->opts->load_config)
force_configdir = "";
if (force_configdir) {
for (int n = 0; n < MP_ARRAY_SIZE(config_dirs); n++) {
if (strcmp(config_dirs[n], type) == 0)
return (n == 0 && force_configdir[0]) ? force_configdir : NULL;
}
}
for (int n = 0; n < MP_ARRAY_SIZE(path_resolvers); n++) {
const char *path = path_resolvers[n](talloc_ctx, type);
if (path && path[0])
return path;
}
return NULL;
}
char *mp_find_user_config_file(void *talloc_ctx, struct mpv_global *global,
const char *filename)
{
void *tmp = talloc_new(NULL);
char *res = (char *)mp_get_platform_path(tmp, global, config_dirs[0]);
if (res)
res = mp_path_join(talloc_ctx, res, filename);
talloc_free(tmp);
MP_VERBOSE(global, "config path: '%s' -> '%s'\n", filename, res ? res : "-");
return res;
}
static char **mp_find_all_config_files_limited(void *talloc_ctx,
struct mpv_global *global,
int max_files,
const char *filename)
{
char **ret = talloc_array(talloc_ctx, char*, 2); // 2 preallocated
int num_ret = 0;
for (int i = 0; i < MP_ARRAY_SIZE(config_dirs); i++) {
const char *dir = mp_get_platform_path(ret, global, config_dirs[i]);
bstr s = bstr0(filename);
while (dir && num_ret < max_files && s.len) {
bstr fn;
bstr_split_tok(s, "|", &fn, &s);
char *file = mp_path_join_bstr(ret, bstr0(dir), fn);
if (mp_path_exists(file)) {
MP_VERBOSE(global, "config path: '%.*s' -> '%s'\n",
BSTR_P(fn), file);
MP_TARRAY_APPEND(NULL, ret, num_ret, file);
} else {
MP_VERBOSE(global, "config path: '%.*s' -/-> '%s'\n",
BSTR_P(fn), file);
}
}
}
MP_TARRAY_GROW(NULL, ret, num_ret);
ret[num_ret] = NULL;
for (int n = 0; n < num_ret / 2; n++)
MPSWAP(char*, ret[n], ret[num_ret - n - 1]);
return ret;
}
char **mp_find_all_config_files(void *talloc_ctx, struct mpv_global *global,
const char *filename)
{
return mp_find_all_config_files_limited(talloc_ctx, global, 64, filename);
}
char *mp_find_config_file(void *talloc_ctx, struct mpv_global *global,
const char *filename)
{
char **l = mp_find_all_config_files_limited(talloc_ctx, global, 1, filename);
char *r = l && l[0] ? talloc_steal(talloc_ctx, l[0]) : NULL;
talloc_free(l);
return r;
}
char *mp_get_user_path(void *talloc_ctx, struct mpv_global *global,
const char *path)
{
if (!path)
return NULL;
char *res = NULL;
bstr bpath = bstr0(path);
if (bstr_eatstart0(&bpath, "~")) {
// parse to "~" <prefix> "/" <rest>
bstr prefix, rest;
if (bstr_split_tok(bpath, "/", &prefix, &rest)) {
const char *rest0 = rest.start; // ok in this case
if (bstr_equals0(prefix, "~")) {
res = mp_find_config_file(talloc_ctx, global, rest0);
if (!res) {
void *tmp = talloc_new(NULL);
const char *p = mp_get_platform_path(tmp, global, "home");
res = mp_path_join_bstr(talloc_ctx, bstr0(p), rest);
talloc_free(tmp);
}
} else if (bstr_equals0(prefix, "")) {
res = mp_path_join_bstr(talloc_ctx, bstr0(getenv("HOME")), rest);
} else if (bstr_eatstart0(&prefix, "~")) {
void *tmp = talloc_new(NULL);
char type[80];
snprintf(type, sizeof(type), "%.*s", BSTR_P(prefix));
const char *p = mp_get_platform_path(tmp, global, type);
res = mp_path_join_bstr(talloc_ctx, bstr0(p), rest);
talloc_free(tmp);
}
}
}
if (!res)
res = talloc_strdup(talloc_ctx, path);
MP_VERBOSE(global, "user path: '%s' -> '%s'\n", path, res);
return res;
}
char *mp_basename(const char *path)
{
char *s;
#if HAVE_DOS_PATHS
s = strrchr(path, '\\');
if (s)
path = s + 1;
s = strrchr(path, ':');
if (s)
path = s + 1;
#endif
s = strrchr(path, '/');
return s ? s + 1 : (char *)path;
}
struct bstr mp_dirname(const char *path)
{
struct bstr ret = {
(uint8_t *)path, mp_basename(path) - path
};
if (ret.len == 0)
return bstr0(".");
return ret;
}
#if HAVE_DOS_PATHS
static const char mp_path_separators[] = "\\/";
#else
static const char mp_path_separators[] = "/";
#endif
// Mutates path and removes a trailing '/' (or '\' on Windows)
void mp_path_strip_trailing_separator(char *path)
{
size_t len = strlen(path);
if (len > 0 && strchr(mp_path_separators, path[len - 1]))
path[len - 1] = '\0';
}
char *mp_splitext(const char *path, bstr *root)
{
assert(path);
const char *split = strrchr(path, '.');
if (!split || !split[1] || strchr(split, '/'))
return NULL;
if (root)
*root = (bstr){(char *)path, split - path};
return (char *)split + 1;
}
char *mp_path_join_bstr(void *talloc_ctx, struct bstr p1, struct bstr p2)
{
bool test;
if (p1.len == 0)
return bstrdup0(talloc_ctx, p2);
if (p2.len == 0)
return bstrdup0(talloc_ctx, p1);
#if HAVE_DOS_PATHS
test = (p2.len >= 2 && p2.start[1] == ':')
|| p2.start[0] == '\\' || p2.start[0] == '/';
#else
test = p2.start[0] == '/';
#endif
if (test)
return bstrdup0(talloc_ctx, p2); // absolute path
bool have_separator;
int endchar1 = p1.start[p1.len - 1];
#if HAVE_DOS_PATHS
have_separator = endchar1 == '/' || endchar1 == '\\'
|| (p1.len == 2 && endchar1 == ':'); // "X:" only
#else
have_separator = endchar1 == '/';
#endif
return talloc_asprintf(talloc_ctx, "%.*s%s%.*s", BSTR_P(p1),
have_separator ? "" : "/", BSTR_P(p2));
}
char *mp_path_join(void *talloc_ctx, const char *p1, const char *p2)
{
return mp_path_join_bstr(talloc_ctx, bstr0(p1), bstr0(p2));
}
char *mp_getcwd(void *talloc_ctx)
{
char *e_wd = getenv("PWD");
if (e_wd)
return talloc_strdup(talloc_ctx, e_wd);
char *wd = talloc_array(talloc_ctx, char, 20);
while (getcwd(wd, talloc_get_size(wd)) == NULL) {
if (errno != ERANGE) {
talloc_free(wd);
return NULL;
}
wd = talloc_realloc(talloc_ctx, wd, char, talloc_get_size(wd) * 2);
}
return wd;
}
bool mp_path_exists(const char *path)
{
struct stat st;
return path && stat(path, &st) == 0;
}
bool mp_path_isdir(const char *path)
{
struct stat st;
return stat(path, &st) == 0 && S_ISDIR(st.st_mode);
}
// Return false if it's considered a normal local filesystem path.
bool mp_is_url(bstr path)
{
int proto = bstr_find0(path, "://");
if (proto < 1)
return false;
// The protocol part must be alphanumeric, otherwise it's not an URL.
for (int i = 0; i < proto; i++) {
unsigned char c = path.start[i];
if (!(c >= 'a' && c <= 'z') && !(c >= 'A' && c <= 'Z') &&
!(c >= '0' && c <= '9') && c != '_')
return false;
}
return true;
}
// Return the protocol part of path, e.g. "http" if path is "http://...".
// On success, out_url (if not NULL) is set to the part after the "://".
bstr mp_split_proto(bstr path, bstr *out_url)
{
if (!mp_is_url(path))
return (bstr){0};
bstr r;
bstr_split_tok(path, "://", &r, out_url ? out_url : &(bstr){0});
return r;
}
void mp_mkdirp(const char *dir)
{
char *path = talloc_strdup(NULL, dir);
char *cdir = path + 1;
while (cdir) {
cdir = strchr(cdir, '/');
if (cdir)
*cdir = 0;
mkdir(path, 0700);
if (cdir)
*cdir++ = '/';
}
talloc_free(path);
}
void mp_mk_config_dir(struct mpv_global *global, char *subdir)
{
char *dir = mp_find_user_config_file(NULL, global, subdir);
if (dir)
mp_mkdirp(dir);
talloc_free(dir);
}
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