2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek#include <string.h>

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek#include <unistd.h>

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek#include <errno.h>

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek#include <stdlib.h>

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek#include <stdio.h>

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek#include <fcntl.h>

b5efdb8af40ea759a1ea584c1bc44ecc81dd00ceLennart Poettering#include <sys/statvfs.h>

cc3773810855956bad92337cee8fa193584ab62eLennart Poettering

3ffd4af22052963e7a29431721ee204e634bea75Lennart Poettering#include "macro.h"

3ffd4af22052963e7a29431721ee204e634bea75Lennart Poettering#include "util.h"

3ffd4af22052963e7a29431721ee204e634bea75Lennart Poettering#include "log.h"

cc3773810855956bad92337cee8fa193584ab62eLennart Poettering#include "strv.h"

3ffd4af22052963e7a29431721ee204e634bea75Lennart Poettering#include "path-util.h"

288a74cce597f81d3ba01d8a5ca7d2ba5b654b7eRonny Chevalier#include "missing.h"

3ffd4af22052963e7a29431721ee204e634bea75Lennart Poettering#include "fileio.h"

b1d4f8e154bf61b5de1b27461ef8e9c8c5e838a1Lennart Poettering

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekbool path_is_absolute(const char *p) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return p[0] == '/';

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekbool is_path(const char *p) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return !!strchr(p, '/');

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmekint path_get_parent(const char *path, char **_r) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek const char *e, *a = NULL, *b = NULL, *p;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek char *r;

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmek bool slash = false;

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmek

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmek assert(path);

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmek assert(_r);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!*path)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return -EINVAL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek for (e = path; *e; e++) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!slash && *e == '/') {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek a = b;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek b = e;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek slash = true;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek } else if (slash && *e != '/')

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek slash = false;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (*(e-1) == '/')

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmek p = a;

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmek else

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmek p = b;

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!p)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return -EINVAL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (p == path)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek r = strdup("/");

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek else

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek r = strndup(path, p-path);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!r)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return -ENOMEM;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek *_r = r;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmekchar **path_split_and_make_absolute(const char *p) {

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmek char **l;

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmek assert(p);

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek l = strv_split(p, ":");

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!l)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return NULL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!path_strv_make_absolute_cwd(l)) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek strv_free(l);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return NULL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return l;

157f50577fbee094eb8ca18f3f0af4e82af8558fDavid Herrmann}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekchar *path_make_absolute(const char *p, const char *prefix) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(p);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

8cb4ab0058e51f1fba93683d145ef95f97c2fa86Lennart Poettering /* Makes every item in the list an absolute path by prepending

157f50577fbee094eb8ca18f3f0af4e82af8558fDavid Herrmann

157f50577fbee094eb8ca18f3f0af4e82af8558fDavid Herrmann if (path_is_absolute(p) || !prefix)

157f50577fbee094eb8ca18f3f0af4e82af8558fDavid Herrmann return strdup(p);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return strjoin(prefix, "/", p, NULL);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekchar *path_make_absolute_cwd(const char *p) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek _cleanup_free_ char *cwd = NULL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(p);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* Similar to path_make_absolute(), but prefixes with the

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (path_is_absolute(p))

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return strdup(p);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek cwd = get_current_dir_name();

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!cwd)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return NULL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return strjoin(cwd, "/", p, NULL);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekint path_make_relative(const char *from_dir, const char *to_path, char **_r) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek char *r, *p;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek unsigned n_parents;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(from_dir);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(to_path);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(_r);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* Strips the common part, and adds ".." elements as necessary. */

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!path_is_absolute(from_dir))

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return -EINVAL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!path_is_absolute(to_path))

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return -EINVAL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* Skip the common part. */

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek for (;;) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek size_t a;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek size_t b;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek from_dir += strspn(from_dir, "/");

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek to_path += strspn(to_path, "/");

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!*from_dir) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!*to_path)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* from_dir equals to_path. */

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek r = strdup(".");

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek else

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* from_dir is a parent directory of to_path. */

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek r = strdup(to_path);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!r)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return -ENOMEM;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek path_kill_slashes(r);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek *_r = r;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!*to_path)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek break;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek a = strcspn(from_dir, "/");

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmek b = strcspn(to_path, "/");

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmek

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmek if (a != b)

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmek break;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (memcmp(from_dir, to_path, a) != 0)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek break;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek from_dir += a;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek to_path += b;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* If we're here, then "from_dir" has one or more elements that need to

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* Count the number of necessary ".." elements. */

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek for (n_parents = 0;;) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek from_dir += strspn(from_dir, "/");

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!*from_dir)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek break;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek from_dir += strcspn(from_dir, "/");

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek n_parents++;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek r = malloc(n_parents * 3 + strlen(to_path) + 1);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!r)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return -ENOMEM;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek for (p = r; n_parents > 0; n_parents--, p += 3)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek memcpy(p, "../", 3);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek strcpy(p, to_path);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek path_kill_slashes(r);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek *_r = r;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekchar **path_strv_make_absolute_cwd(char **l) {

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering char **s;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering /* Goes through every item in the string list and makes it

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek STRV_FOREACH(s, l) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek char *t;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek t = path_make_absolute_cwd(*s);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!t)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return NULL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek free(*s);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek *s = t;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return l;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekchar **path_strv_resolve(char **l, const char *prefix) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek char **s;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek unsigned k = 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek bool enomem = false;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (strv_isempty(l))

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return l;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* Goes through every item in the string list and canonicalize

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek STRV_FOREACH(s, l) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek char *t, *u;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek _cleanup_free_ char *orig = NULL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!path_is_absolute(*s)) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek free(*s);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek continue;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (prefix) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek orig = *s;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek t = strappend(prefix, orig);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!t) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek enomem = true;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek continue;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek } else

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek t = *s;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek errno = 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek u = canonicalize_file_name(t);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!u) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (errno == ENOENT) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (prefix) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek u = orig;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek orig = NULL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek free(t);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek } else

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek u = t;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek } else {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek free(t);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (errno == ENOMEM || errno == 0)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek enomem = true;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek continue;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek } else if (prefix) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek char *x;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek free(t);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek x = path_startswith(u, prefix);

d3e84ddb885e9d5f0ae9930eb905910e3a81f157Lennart Poettering if (x) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* restore the slash if it was lost */

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!startswith(x, "/"))

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek *(--x) = '/';

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek t = strdup(x);

b80120c4cba7d134b5437a58437a23fdf7ab2084David Herrmann free(u);

b80120c4cba7d134b5437a58437a23fdf7ab2084David Herrmann if (!t) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek enomem = true;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek continue;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek u = t;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek } else {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* canonicalized path goes outside of

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek free(u);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek u = orig;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek orig = NULL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek } else

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek free(t);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek l[k++] = u;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

d3e84ddb885e9d5f0ae9930eb905910e3a81f157Lennart Poettering

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek l[k] = NULL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (enomem)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return NULL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return l;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekchar **path_strv_resolve_uniq(char **l, const char *prefix) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (strv_isempty(l))

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return l;

5cb14b3742038b28551b161635a0cba3559404b2Lennart Poettering

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (!path_strv_resolve(l, prefix))

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return NULL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return strv_uniq(l);

85a428c69465b047731b6abb5005f01824f1444eLennart Poettering}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekchar *path_kill_slashes(char *path) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek char *f, *t;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek bool slash = false;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* Removes redundant inner and trailing slashes. Modifies the

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek for (f = path, t = path; *f; f++) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (*f == '/') {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek slash = true;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek continue;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (slash) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek slash = false;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek *(t++) = '/';

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek *(t++) = *f;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* Special rule, if we are talking of the root directory, a

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (t == path && slash)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek *(t++) = '/';

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek *t = 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return path;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekchar* path_startswith(const char *path, const char *prefix) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(path);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek assert(prefix);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if ((path[0] == '/') != (prefix[0] == '/'))

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return NULL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek for (;;) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek size_t a, b;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

92bd5ff3a062c3f9475b9d9d39b9335bfeb7705eDavid Herrmann path += strspn(path, "/");

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek prefix += strspn(prefix, "/");

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmek

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmek if (*prefix == 0)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return (char*) path;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (*path == 0)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return NULL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek a = strcspn(path, "/");

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek b = strcspn(prefix, "/");

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (a != b)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return NULL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (memcmp(path, prefix, a) != 0)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return NULL;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek path += a;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek prefix += b;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek }

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek}

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmekint path_compare(const char *a, const char *b) {

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek int d;

92bd5ff3a062c3f9475b9d9d39b9335bfeb7705eDavid Herrmann

cc3773810855956bad92337cee8fa193584ab62eLennart Poettering assert(a);

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmek assert(b);

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* A relative path and an abolute path must not compare as equal.

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek d = (a[0] == '/') - (b[0] == '/');

92bd5ff3a062c3f9475b9d9d39b9335bfeb7705eDavid Herrmann if (d)

92bd5ff3a062c3f9475b9d9d39b9335bfeb7705eDavid Herrmann return d;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek for (;;) {

92bd5ff3a062c3f9475b9d9d39b9335bfeb7705eDavid Herrmann size_t j, k;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek a += strspn(a, "/");

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek b += strspn(b, "/");

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (*a == 0 && *b == 0)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return 0;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* Order prefixes first: "/foo" before "/foo/bar" */

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (*a == 0)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return -1;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (*b == 0)

61376f96a98291b5421bfd79a15ca4db50c2a3feZbigniew Jędrzejewski-Szmek return 1;

cc3773810855956bad92337cee8fa193584ab62eLennart Poettering

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek j = strcspn(a, "/");

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek k = strcspn(b, "/");

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek /* Alphabetical sort: "/foo/aaa" before "/foo/b" */

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek d = memcmp(a, b, MIN(j, k));

cc3773810855956bad92337cee8fa193584ab62eLennart Poettering if (d)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return (d > 0) - (d < 0); /* sign of d */

cc3773810855956bad92337cee8fa193584ab62eLennart Poettering

cc3773810855956bad92337cee8fa193584ab62eLennart Poettering /* Sort "/foo/a" before "/foo/aaa" */

cc3773810855956bad92337cee8fa193584ab62eLennart Poettering d = (j > k) - (j < k); /* sign of (j - k) */

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek if (d)

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek return d;

2b3ab29de466ae6bd7c3243a5a48c7291cc2af0aZbigniew Jędrzejewski-Szmek

2d62c530d2b4c2730abff715b7342f1402114513Lennart Poettering a += j;

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering b += k;

2d62c530d2b4c2730abff715b7342f1402114513Lennart Poettering }

2d62c530d2b4c2730abff715b7342f1402114513Lennart Poettering}

2d62c530d2b4c2730abff715b7342f1402114513Lennart Poettering

2d62c530d2b4c2730abff715b7342f1402114513Lennart Poetteringbool path_equal(const char *a, const char *b) {

2d62c530d2b4c2730abff715b7342f1402114513Lennart Poettering return path_compare(a, b) == 0;

2d62c530d2b4c2730abff715b7342f1402114513Lennart Poettering}

2d62c530d2b4c2730abff715b7342f1402114513Lennart Poettering

2d62c530d2b4c2730abff715b7342f1402114513Lennart Poetteringbool path_equal_or_files_same(const char *a, const char *b) {

2d62c530d2b4c2730abff715b7342f1402114513Lennart Poettering return path_equal(a, b) || files_same(a, b) > 0;

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering}

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poetteringchar* path_join(const char *root, const char *path, const char *rest) {

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering assert(path);

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering if (!isempty(root))

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering return strjoin(root, endswith(root, "/") ? "" : "/",

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering path[0] == '/' ? path+1 : path,

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering rest ? (endswith(path, "/") ? "" : "/") : NULL,

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering rest && rest[0] == '/' ? rest+1 : rest,

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering NULL);

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering else

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering return strjoin(path,

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering rest ? (endswith(path, "/") ? "" : "/") : NULL,

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering rest && rest[0] == '/' ? rest+1 : rest,

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering NULL);

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering}

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poetteringstatic int fd_fdinfo_mnt_id(int fd, const char *filename, int flags, int *mnt_id) {

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering char path[strlen("/proc/self/fdinfo/") + DECIMAL_STR_MAX(int)];

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering _cleanup_free_ char *fdinfo = NULL;

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering _cleanup_close_ int subfd = -1;

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering char *p;

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering int r;

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering if ((flags & AT_EMPTY_PATH) && isempty(filename))

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering xsprintf(path, "/proc/self/fdinfo/%i", fd);

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering else {

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering subfd = openat(fd, filename, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_PATH);

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering if (subfd < 0)

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering return -errno;

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering

94036de887ad5b0dc805abe38b5c1c58b57d9465Mantas Mikulėnas xsprintf(path, "/proc/self/fdinfo/%i", subfd);

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering }

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering r = read_full_file(path, &fdinfo, NULL);

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering if (r == -ENOENT) /* The fdinfo directory is a relatively new addition */

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering return -EOPNOTSUPP;

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering if (r < 0)

6a79c58603ea816a1b4fa1520397b4e138bc1ca0Lennart Poettering return -errno;

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering p = startswith(fdinfo, "mnt_id:");

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering if (!p) {

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering p = strstr(fdinfo, "\nmnt_id:");

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering if (!p) /* The mnt_id field is a relatively new addition */

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering return -EOPNOTSUPP;

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering p += 8;

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering }

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering p += strspn(p, WHITESPACE);

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering p[strcspn(p, WHITESPACE)] = 0;

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering return safe_atoi(p, mnt_id);

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering}

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poetteringint fd_is_mount_point(int fd, const char *filename, int flags) {

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering union file_handle_union h = FILE_HANDLE_INIT, h_parent = FILE_HANDLE_INIT;

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering int mount_id = -1, mount_id_parent = -1;

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering bool nosupp = false, check_st_dev = true;

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering struct stat a, b;

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering int r;

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering assert(fd >= 0);

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering assert(filename);

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering /* First we will try the name_to_handle_at() syscall, which

3c56cab44150ad47323970cfadfb0257c6305a74Ben Wolsieffer

3c56cab44150ad47323970cfadfb0257c6305a74Ben Wolsieffer r = name_to_handle_at(fd, filename, &h.handle, &mount_id, flags);

3c56cab44150ad47323970cfadfb0257c6305a74Ben Wolsieffer if (r < 0) {

3c56cab44150ad47323970cfadfb0257c6305a74Ben Wolsieffer if (errno == ENOSYS)

3c56cab44150ad47323970cfadfb0257c6305a74Ben Wolsieffer /* This kernel does not support name_to_handle_at()

3c56cab44150ad47323970cfadfb0257c6305a74Ben Wolsieffer goto fallback_fdinfo;

602a41c22ac2df33b4b5e5083719c1cfaf58acf9Lennart Poettering else if (errno == EOPNOTSUPP)

3c56cab44150ad47323970cfadfb0257c6305a74Ben Wolsieffer /* This kernel or file system does not support

3c56cab44150ad47323970cfadfb0257c6305a74Ben Wolsieffer nosupp = true;

3c56cab44150ad47323970cfadfb0257c6305a74Ben Wolsieffer else

3c56cab44150ad47323970cfadfb0257c6305a74Ben Wolsieffer return -errno;

3c56cab44150ad47323970cfadfb0257c6305a74Ben Wolsieffer }

r = name_to_handle_at(fd, "", &h_parent.handle, &mount_id_parent, AT_EMPTY_PATH);

if (r < 0) {

if (errno == EOPNOTSUPP) {

if (nosupp)

/* Neither parent nor child do name_to_handle_at()?

goto fallback_fdinfo;

else

/* The parent can't do name_to_handle_at() but the

return 1;

} else

return -errno;

}

/* The parent can do name_to_handle_at() but the

if (nosupp)

return 1;

/* If the file handle for the directory we are

if (h.handle.handle_bytes == h_parent.handle.handle_bytes &&

h.handle.handle_type == h_parent.handle.handle_type &&

memcmp(h.handle.f_handle, h_parent.handle.f_handle, h.handle.handle_bytes) == 0)

return 1;

return mount_id != mount_id_parent;

fallback_fdinfo:

r = fd_fdinfo_mnt_id(fd, filename, flags, &mount_id);

if (r == -EOPNOTSUPP)

goto fallback_fstat;

if (r < 0)

return r;

r = fd_fdinfo_mnt_id(fd, "", AT_EMPTY_PATH, &mount_id_parent);

if (r < 0)

return r;

if (mount_id != mount_id_parent)

return 1;

/* Hmm, so, the mount ids are the same. This leaves one

check_st_dev = false;

fallback_fstat:

/* yay for fstatat() taking a different set of flags than the other

if (flags & AT_SYMLINK_FOLLOW)

flags &= ~AT_SYMLINK_FOLLOW;

else

flags |= AT_SYMLINK_NOFOLLOW;

if (fstatat(fd, filename, &a, flags) < 0)

return -errno;

if (fstatat(fd, "", &b, AT_EMPTY_PATH) < 0)

return -errno;

/* A directory with same device and inode as its parent? Must

if (a.st_dev == b.st_dev &&

a.st_ino == b.st_ino)

return 1;

return check_st_dev && (a.st_dev != b.st_dev);

}

int path_is_mount_point(const char *t, int flags) {

_cleanup_close_ int fd = -1;

_cleanup_free_ char *parent = NULL;

int r;

assert(t);

if (path_equal(t, "/"))

return 1;

r = path_get_parent(t, &parent);

if (r < 0)

return r;

fd = openat(AT_FDCWD, parent, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_PATH);

if (fd < 0)

return -errno;

return fd_is_mount_point(fd, basename(t), flags);

}

int path_is_read_only_fs(const char *path) {

struct statvfs st;

assert(path);

if (statvfs(path, &st) < 0)

return -errno;

if (st.f_flag & ST_RDONLY)

return true;

/* On NFS, statvfs() might not reflect whether we can actually

if (access(path, W_OK) < 0 && errno == EROFS)

return true;

return false;

}

int path_is_os_tree(const char *path) {

char *p;

int r;

/* We use /usr/lib/os-release as flag file if something is an OS */

p = strjoina(path, "/usr/lib/os-release");

r = access(p, F_OK);

if (r >= 0)

return 1;

/* Also check for the old location in /etc, just in case. */

p = strjoina(path, "/etc/os-release");

r = access(p, F_OK);

return r >= 0;

}

int find_binary(const char *name, bool local, char **filename) {

assert(name);

if (is_path(name)) {

if (local && access(name, X_OK) < 0)

return -errno;

if (filename) {

char *p;

p = path_make_absolute_cwd(name);

if (!p)

return -ENOMEM;

*filename = p;

}

return 0;

} else {

const char *path;

const char *word, *state;

size_t l;

/**

path = getenv("PATH");

if (!path)

path = DEFAULT_PATH;

FOREACH_WORD_SEPARATOR(word, l, path, ":", state) {

_cleanup_free_ char *p = NULL;

if (asprintf(&p, "%.*s/%s", (int) l, word, name) < 0)

return -ENOMEM;

if (access(p, X_OK) < 0)

continue;

if (filename) {

*filename = path_kill_slashes(p);

p = NULL;

}

return 0;

}

return -ENOENT;

}

}

bool paths_check_timestamp(const char* const* paths, usec_t *timestamp, bool update) {

bool changed = false;

const char* const* i;

assert(timestamp);

if (paths == NULL)

return false;

STRV_FOREACH(i, paths) {

struct stat stats;

usec_t u;

if (stat(*i, &stats) < 0)

continue;

u = timespec_load(&stats.st_mtim);

/* first check */

if (*timestamp >= u)

continue;

log_debug("timestamp of '%s' changed", *i);

/* update timestamp */

if (update) {

*timestamp = u;

changed = true;

} else

return true;

}

return changed;

}

int fsck_exists(const char *fstype) {

_cleanup_free_ char *p = NULL, *d = NULL;

const char *checker;

int r;

checker = strjoina("fsck.", fstype);

r = find_binary(checker, true, &p);

if (r < 0)

return r;

/* An fsck that is linked to /bin/true is a non-existent

r = readlink_malloc(p, &d);

if (r >= 0 &&

(path_equal(d, "/bin/true") ||

path_equal(d, "/usr/bin/true") ||

path_equal(d, "/dev/null")))

return -ENOENT;

return 0;

}

char *prefix_root(const char *root, const char *path) {

char *n, *p;

size_t l;

/* If root is passed, prefixes path with it. Otherwise returns

assert(path);

/* First, drop duplicate prefixing slashes from the path */

while (path[0] == '/' && path[1] == '/')

path++;

if (isempty(root) || path_equal(root, "/"))

return strdup(path);

l = strlen(root) + 1 + strlen(path) + 1;

n = new(char, l);

if (!n)

return NULL;

p = stpcpy(n, root);

while (p > n && p[-1] == '/')

p--;

if (path[0] != '/')

*(p++) = '/';

strcpy(p, path);

return n;

}