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-rw-r--r--otautil/DirUtil.cpp256
-rw-r--r--otautil/DirUtil.h51
2 files changed, 95 insertions, 212 deletions
diff --git a/otautil/DirUtil.cpp b/otautil/DirUtil.cpp
index e08e360c0..fffc82219 100644
--- a/otautil/DirUtil.cpp
+++ b/otautil/DirUtil.cpp
@@ -16,203 +16,101 @@
#include "DirUtil.h"
+#include <dirent.h>
+#include <errno.h>
#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <sys/types.h>
#include <sys/stat.h>
+#include <sys/types.h>
#include <unistd.h>
-#include <errno.h>
-#include <dirent.h>
-#include <limits.h>
#include <string>
#include <selinux/label.h>
#include <selinux/selinux.h>
-typedef enum { DMISSING, DDIR, DILLEGAL } DirStatus;
+enum class DirStatus { DMISSING, DDIR, DILLEGAL };
-static DirStatus
-getPathDirStatus(const char *path)
-{
- struct stat st;
- int err;
-
- err = stat(path, &st);
- if (err == 0) {
- /* Something's there; make sure it's a directory.
- */
- if (S_ISDIR(st.st_mode)) {
- return DDIR;
- }
- errno = ENOTDIR;
- return DILLEGAL;
- } else if (errno != ENOENT) {
- /* Something went wrong, or something in the path
- * is bad. Can't do anything in this situation.
- */
- return DILLEGAL;
+static DirStatus dir_status(const std::string& path) {
+ struct stat sb;
+ if (stat(path.c_str(), &sb) == 0) {
+ // Something's there; make sure it's a directory.
+ if (S_ISDIR(sb.st_mode)) {
+ return DirStatus::DDIR;
}
- return DMISSING;
+ errno = ENOTDIR;
+ return DirStatus::DILLEGAL;
+ } else if (errno != ENOENT) {
+ // Something went wrong, or something in the path is bad. Can't do anything in this situation.
+ return DirStatus::DILLEGAL;
+ }
+ return DirStatus::DMISSING;
}
-int
-dirCreateHierarchy(const char *path, int mode,
- const struct utimbuf *timestamp, bool stripFileName,
- struct selabel_handle *sehnd)
-{
- DirStatus ds;
-
- /* Check for an empty string before we bother
- * making any syscalls.
- */
- if (path[0] == '\0') {
- errno = ENOENT;
- return -1;
- }
- // Allocate a path that we can modify; stick a slash on
- // the end to make things easier.
- std::string cpath = path;
- if (stripFileName) {
- // Strip everything after the last slash.
- size_t pos = cpath.rfind('/');
- if (pos == std::string::npos) {
- errno = ENOENT;
- return -1;
- }
- cpath.resize(pos + 1);
- } else {
- // Make sure that the path ends in a slash.
- cpath.push_back('/');
- }
-
- /* See if it already exists.
- */
- ds = getPathDirStatus(cpath.c_str());
- if (ds == DDIR) {
- return 0;
- } else if (ds == DILLEGAL) {
- return -1;
- }
-
- /* Walk up the path from the root and make each level.
- * If a directory already exists, no big deal.
- */
- const char *path_start = &cpath[0];
- char *p = &cpath[0];
- while (*p != '\0') {
- /* Skip any slashes, watching out for the end of the string.
- */
- while (*p != '\0' && *p == '/') {
- p++;
- }
- if (*p == '\0') {
- break;
- }
-
- /* Find the end of the next path component.
- * We know that we'll see a slash before the NUL,
- * because we added it, above.
- */
- while (*p != '/') {
- p++;
- }
- *p = '\0';
-
- /* Check this part of the path and make a new directory
- * if necessary.
- */
- ds = getPathDirStatus(path_start);
- if (ds == DILLEGAL) {
- /* Could happen if some other process/thread is
- * messing with the filesystem.
- */
- return -1;
- } else if (ds == DMISSING) {
- int err;
-
- char *secontext = NULL;
-
- if (sehnd) {
- selabel_lookup(sehnd, &secontext, path_start, mode);
- setfscreatecon(secontext);
- }
-
- err = mkdir(path_start, mode);
-
- if (secontext) {
- freecon(secontext);
- setfscreatecon(NULL);
- }
-
- if (err != 0) {
- return -1;
- }
- if (timestamp != NULL && utime(path_start, timestamp)) {
- return -1;
- }
- }
- // else, this directory already exists.
-
- // Repair the path and continue.
- *p = '/';
+int mkdir_recursively(const std::string& input_path, mode_t mode, bool strip_filename,
+ const selabel_handle* sehnd) {
+ // Check for an empty string before we bother making any syscalls.
+ if (input_path.empty()) {
+ errno = ENOENT;
+ return -1;
+ }
+
+ // Allocate a path that we can modify; stick a slash on the end to make things easier.
+ std::string path = input_path;
+ if (strip_filename) {
+ // Strip everything after the last slash.
+ size_t pos = path.rfind('/');
+ if (pos == std::string::npos) {
+ errno = ENOENT;
+ return -1;
}
+ path.resize(pos + 1);
+ } else {
+ // Make sure that the path ends in a slash.
+ path.push_back('/');
+ }
+
+ // See if it already exists.
+ DirStatus ds = dir_status(path);
+ if (ds == DirStatus::DDIR) {
return 0;
-}
-
-int
-dirUnlinkHierarchy(const char *path)
-{
- struct stat st;
- DIR *dir;
- struct dirent *de;
- int fail = 0;
-
- /* is it a file or directory? */
- if (lstat(path, &st) < 0) {
- return -1;
- }
-
- /* a file, so unlink it */
- if (!S_ISDIR(st.st_mode)) {
- return unlink(path);
+ } else if (ds == DirStatus::DILLEGAL) {
+ return -1;
+ }
+
+ // Walk up the path from the root and make each level.
+ size_t prev_end = 0;
+ while (prev_end < path.size()) {
+ size_t next_end = path.find('/', prev_end + 1);
+ if (next_end == std::string::npos) {
+ break;
}
-
- /* a directory, so open handle */
- dir = opendir(path);
- if (dir == NULL) {
+ std::string dir_path = path.substr(0, next_end);
+ // Check this part of the path and make a new directory if necessary.
+ switch (dir_status(dir_path)) {
+ case DirStatus::DILLEGAL:
+ // Could happen if some other process/thread is messing with the filesystem.
return -1;
- }
-
- /* recurse over components */
- errno = 0;
- while ((de = readdir(dir)) != NULL) {
- //TODO: don't blow the stack
- char dn[PATH_MAX];
- if (!strcmp(de->d_name, "..") || !strcmp(de->d_name, ".")) {
- continue;
+ case DirStatus::DMISSING: {
+ char* secontext = nullptr;
+ if (sehnd) {
+ selabel_lookup(const_cast<selabel_handle*>(sehnd), &secontext, dir_path.c_str(), mode);
+ setfscreatecon(secontext);
}
- snprintf(dn, sizeof(dn), "%s/%s", path, de->d_name);
- if (dirUnlinkHierarchy(dn) < 0) {
- fail = 1;
- break;
+ int err = mkdir(dir_path.c_str(), mode);
+ if (secontext) {
+ freecon(secontext);
+ setfscreatecon(nullptr);
}
- errno = 0;
- }
- /* in case readdir or unlink_recursive failed */
- if (fail || errno < 0) {
- int save = errno;
- closedir(dir);
- errno = save;
- return -1;
- }
-
- /* close directory handle */
- if (closedir(dir) < 0) {
- return -1;
+ if (err != 0) {
+ return -1;
+ }
+ break;
+ }
+ default:
+ // Already exists.
+ break;
}
-
- /* delete target directory */
- return rmdir(path);
+ prev_end = next_end;
+ }
+ return 0;
}
diff --git a/otautil/DirUtil.h b/otautil/DirUtil.h
index 85b83c387..85d6c16d1 100644
--- a/otautil/DirUtil.h
+++ b/otautil/DirUtil.h
@@ -14,41 +14,26 @@
* limitations under the License.
*/
-#ifndef MINZIP_DIRUTIL_H_
-#define MINZIP_DIRUTIL_H_
+#ifndef OTAUTIL_DIRUTIL_H_
+#define OTAUTIL_DIRUTIL_H_
-#include <stdbool.h>
-#include <utime.h>
+#include <sys/stat.h> // mode_t
-#ifdef __cplusplus
-extern "C" {
-#endif
+#include <string>
struct selabel_handle;
-/* Like "mkdir -p", try to guarantee that all directories
- * specified in path are present, creating as many directories
- * as necessary. The specified mode is passed to all mkdir
- * calls; no modifications are made to umask.
- *
- * If stripFileName is set, everything after the final '/'
- * is stripped before creating the directory hierarchy.
- *
- * If timestamp is non-NULL, new directories will be timestamped accordingly.
- *
- * Returns 0 on success; returns -1 (and sets errno) on failure
- * (usually if some element of path is not a directory).
- */
-int dirCreateHierarchy(const char *path, int mode,
- const struct utimbuf *timestamp, bool stripFileName,
- struct selabel_handle* sehnd);
-
-/* rm -rf <path>
- */
-int dirUnlinkHierarchy(const char *path);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif // MINZIP_DIRUTIL_H_
+// Like "mkdir -p", try to guarantee that all directories specified in path are present, creating as
+// many directories as necessary. The specified mode is passed to all mkdir calls; no modifications
+// are made to umask.
+//
+// If strip_filename is set, everything after the final '/' is stripped before creating the
+// directory
+// hierarchy.
+//
+// Returns 0 on success; returns -1 (and sets errno) on failure (usually if some element of path is
+// not a directory).
+int mkdir_recursively(const std::string& path, mode_t mode, bool strip_filename,
+ const struct selabel_handle* sehnd);
+
+#endif // OTAUTIL_DIRUTIL_H_
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-19 07:38:19 +0100