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/*
* libdpkg - Debian packaging suite library routines
* dir.c - directory handling functions
*
* Copyright © 2010 Guillem Jover <guillem@debian.org>
*
* This 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.
*
* This 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 this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <compat.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <dirent.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <dpkg/dpkg.h>
#include <dpkg/i18n.h>
#include <dpkg/dir.h>
static int
dir_make_path_noalloc(char *dirname, mode_t mode)
{
char *slash;
/* Find the first slash, and ignore it, as it will be either the
* slash for the root directory, for the current directory in a
* relative pathname or its parent. */
slash = strchr(dirname, '/');
while (slash != NULL) {
slash = strchr(slash + 1, '/');
if (slash)
*slash = '\0';
if (mkdir(dirname, mode) < 0 && errno != EEXIST)
return -1;
if (slash)
*slash = '/';
}
return 0;
}
/**
* Create the directory and all its parents if necessary.
*
* @param path The pathname to create directories for.
* @param mode The pathname mode.
*/
int
dir_make_path(const char *path, mode_t mode)
{
char *dirname;
int rc;
dirname = m_strdup(path);
rc = dir_make_path_noalloc(dirname, mode);
free(dirname);
return rc;
}
int
dir_make_path_parent(const char *path, mode_t mode)
{
char *dirname, *slash;
int rc;
dirname = m_strdup(path);
slash = strrchr(dirname, '/');
if (slash != NULL) {
*slash = '\0';
rc = dir_make_path_noalloc(dirname, mode);
} else {
rc = -1;
}
free(dirname);
return rc;
}
/**
* Sync a directory to disk from a DIR structure.
*
* @param dir The directory to sync.
* @param path The name of the directory to sync (for error messages).
*/
static void
dir_sync(DIR *dir, const char *path)
{
#ifdef HAVE_FSYNC_DIR
int fd;
fd = dirfd(dir);
if (fd < 0)
ohshite(_("unable to get file descriptor for directory '%s'"),
path);
if (fsync(fd))
ohshite(_("unable to sync directory '%s'"), path);
#endif
}
/**
* Sync a directory to disk from a pathname.
*
* @param path The name of the directory to sync.
*/
void
dir_sync_path(const char *path)
{
#ifdef HAVE_FSYNC_DIR
DIR *dir;
dir = opendir(path);
if (!dir)
ohshite(_("unable to open directory '%s'"), path);
dir_sync(dir, path);
closedir(dir);
#endif
}
/**
* Sync to disk the parent directory of a pathname.
*
* @param path The child pathname of the directory to sync.
*/
void
dir_sync_path_parent(const char *path)
{
#ifdef HAVE_FSYNC_DIR
char *dirname, *slash;
dirname = m_strdup(path);
slash = strrchr(dirname, '/');
if (slash != NULL) {
*slash = '\0';
dir_sync_path(dirname);
}
free(dirname);
#endif
}
/* TODO: Ideally we'd use openat() here, to avoid the path mangling, but
* it's not widely available yet, so this will do for now. */
static void
dir_file_sync(const char *dir, const char *filename)
{
char *path;
int fd;
path = str_fmt("%s/%s", dir, filename);
fd = open(path, O_WRONLY);
if (fd < 0)
ohshite(_("unable to open file '%s'"), path);
if (fsync(fd))
ohshite(_("unable to sync file '%s'"), path);
if (close(fd))
ohshite(_("unable to close file '%s'"), path);
free(path);
}
/**
* Sync to disk the contents and the directory specified.
*
* @param path The pathname to sync.
*/
void
dir_sync_contents(const char *path)
{
DIR *dir;
struct dirent *dent;
dir = opendir(path);
if (!dir)
ohshite(_("unable to open directory '%s'"), path);
while ((dent = readdir(dir)) != NULL) {
if (strcmp(dent->d_name, ".") == 0 ||
strcmp(dent->d_name, "..") == 0)
continue;
dir_file_sync(path, dent->d_name);
}
dir_sync(dir, path);
closedir(dir);
}
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