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Diffstat (limited to 'lib/dpkg/dir.c')
| -rw-r--r-- | lib/dpkg/dir.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/lib/dpkg/dir.c b/lib/dpkg/dir.c new file mode 100644 index 0000000..f03aabc --- /dev/null +++ b/lib/dpkg/dir.c @@ -0,0 +1,213 @@ +/* + * 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); +} |