| Directory: | cvmfs/ |
|---|---|
| File: | cvmfs/util/fs_traversal.h |
| Date: | 2025-09-14 02:35:40 |
| Exec | Total | Coverage | |
|---|---|---|---|
| Lines: | 92 | 99 | 92.9% |
| Branches: | 127 | 245 | 51.8% |
| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /** | ||
| 2 | * This file is part of the CernVM File System. | ||
| 3 | * | ||
| 4 | * It provides a file system traversal framework to abstract the traversal | ||
| 5 | * of directories. | ||
| 6 | */ | ||
| 7 | |||
| 8 | #ifndef CVMFS_UTIL_FS_TRAVERSAL_H_ | ||
| 9 | #define CVMFS_UTIL_FS_TRAVERSAL_H_ | ||
| 10 | |||
| 11 | #include <dirent.h> | ||
| 12 | #include <errno.h> | ||
| 13 | #include <sys/stat.h> | ||
| 14 | |||
| 15 | #include <cassert> | ||
| 16 | #include <cstdlib> | ||
| 17 | #include <string> | ||
| 18 | |||
| 19 | #include "util/exception.h" | ||
| 20 | #include "util/logging.h" | ||
| 21 | #include "util/platform.h" | ||
| 22 | |||
| 23 | #ifdef CVMFS_NAMESPACE_GUARD | ||
| 24 | namespace CVMFS_NAMESPACE_GUARD { | ||
| 25 | #endif | ||
| 26 | |||
| 27 | /** | ||
| 28 | * @brief A simple recursion engine to abstract the recursion of directories. | ||
| 29 | * It provides several callback hooks to instrument and control the recursion. | ||
| 30 | * Hooks will be called on the provided delegate object of type T | ||
| 31 | * | ||
| 32 | * Callbacks are called for every directory entry found by the recursion engine. | ||
| 33 | * The recursion can be influenced by return values of these callbacks. | ||
| 34 | */ | ||
| 35 | template<class T> | ||
| 36 | class FileSystemTraversal { | ||
| 37 | public: | ||
| 38 | typedef void (T::*VoidCallback)(const std::string &relative_path, | ||
| 39 | const std::string &dir_name); | ||
| 40 | typedef bool (T::*BoolCallback)(const std::string &relative_path, | ||
| 41 | const std::string &dir_name); | ||
| 42 | |||
| 43 | |||
| 44 | VoidCallback fn_enter_dir; | ||
| 45 | VoidCallback fn_leave_dir; | ||
| 46 | VoidCallback fn_new_file; | ||
| 47 | VoidCallback fn_new_symlink; | ||
| 48 | VoidCallback fn_new_socket; | ||
| 49 | VoidCallback fn_new_block_dev; | ||
| 50 | VoidCallback fn_new_character_dev; | ||
| 51 | VoidCallback fn_new_fifo; | ||
| 52 | |||
| 53 | /** | ||
| 54 | * Optional callback for all files during recursion to decide | ||
| 55 | * whether to completely ignore the file. If this callback returns | ||
| 56 | * true then the file will not be processed (this is a replacement | ||
| 57 | * for the ignored_files set, and it allows to ignore based on names | ||
| 58 | * or something else). If the function is not specified, no files | ||
| 59 | * will be ignored (except for "." and ".."). | ||
| 60 | */ | ||
| 61 | BoolCallback fn_ignore_file; | ||
| 62 | |||
| 63 | /** | ||
| 64 | * Callback if a directory was found. Depending on the response of | ||
| 65 | * the callback, the recursion will continue in the found directory/ | ||
| 66 | * If this callback is not specified, it will recurse by default. | ||
| 67 | */ | ||
| 68 | BoolCallback fn_new_dir_prefix; | ||
| 69 | |||
| 70 | /** | ||
| 71 | * Callback for a found directory after it was already recursed | ||
| 72 | * e.g. for deletion of directories: first delete content, | ||
| 73 | * then the directory itself | ||
| 74 | */ | ||
| 75 | VoidCallback fn_new_dir_postfix; | ||
| 76 | |||
| 77 | |||
| 78 | /** | ||
| 79 | * Create a new recursion engine | ||
| 80 | * @param delegate The object that will receive the callbacks | ||
| 81 | * @param relative_to_directory The DirEntries will be created relative | ||
| 82 | * to this directory | ||
| 83 | * @param recurse Should the traversal engine recurse? (if not, | ||
| 84 | * it just traverses the given directory) | ||
| 85 | */ | ||
| 86 | 24745 | FileSystemTraversal(T *delegate, | |
| 87 | const std::string &relative_to_directory, | ||
| 88 | const bool recurse) | ||
| 89 | 24745 | : fn_enter_dir(NULL) | |
| 90 | 24745 | , fn_leave_dir(NULL) | |
| 91 | 24745 | , fn_new_file(NULL) | |
| 92 | 24745 | , fn_new_symlink(NULL) | |
| 93 | 24745 | , fn_new_socket(NULL) | |
| 94 | 24745 | , fn_new_block_dev(NULL) | |
| 95 | 24745 | , fn_new_character_dev(NULL) | |
| 96 | 24745 | , fn_new_fifo(NULL) | |
| 97 | 24745 | , fn_ignore_file(NULL) | |
| 98 | 24745 | , fn_new_dir_prefix(NULL) | |
| 99 | 24745 | , fn_new_dir_postfix(NULL) | |
| 100 | 24745 | , delegate_(delegate) | |
| 101 | 24745 | , relative_to_directory_(relative_to_directory) | |
| 102 | 24745 | , recurse_(recurse) { | |
| 103 | 24745 | Init(); | |
| 104 | 24745 | } | |
| 105 | |||
| 106 | /** | ||
| 107 | * Start the recursion. | ||
| 108 | * @param dir_path The directory to start the recursion at | ||
| 109 | */ | ||
| 110 | 24745 | void Recurse(const std::string &dir_path) const { | |
| 111 |
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24745 | assert(fn_enter_dir != NULL || fn_leave_dir != NULL || fn_new_file != NULL |
| 112 | || fn_new_symlink != NULL || fn_new_dir_prefix != NULL | ||
| 113 | || fn_new_block_dev != NULL || fn_new_character_dev != NULL | ||
| 114 | || fn_new_fifo != NULL || fn_new_socket != NULL); | ||
| 115 | |||
| 116 |
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24745 | assert(relative_to_directory_.length() == 0 |
| 117 | || dir_path.substr(0, relative_to_directory_.length()) | ||
| 118 | == relative_to_directory_); | ||
| 119 | |||
| 120 |
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24745 | DoRecursion(dir_path, ""); |
| 121 | 24745 | } | |
| 122 | |||
| 123 | private: | ||
| 124 | // The delegate all hooks are called on | ||
| 125 | T *delegate_; | ||
| 126 | |||
| 127 | /** dir_path in callbacks will be relative to this directory */ | ||
| 128 | std::string relative_to_directory_; | ||
| 129 | bool recurse_; | ||
| 130 | |||
| 131 | |||
| 132 | 24745 | void Init() { } | |
| 133 | |||
| 134 | 58116 | void DoRecursion(const std::string &parent_path, | |
| 135 | const std::string &dir_name) const { | ||
| 136 | DIR *dip; | ||
| 137 | platform_dirent64 *dit; | ||
| 138 |
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58116 | const std::string path = parent_path |
| 139 |
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116232 | + ((!dir_name.empty()) ? ("/" + dir_name) : ""); |
| 140 | |||
| 141 | // Change into directory and notify the user | ||
| 142 |
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58116 | LogCvmfs(kLogFsTraversal, kLogVerboseMsg, "entering %s (%s -- %s)", |
| 143 | path.c_str(), parent_path.c_str(), dir_name.c_str()); | ||
| 144 |
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58116 | dip = opendir(path.c_str()); |
| 145 |
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58116 | if (!dip) { |
| 146 | ✗ | PANIC(kLogStderr, | |
| 147 | "Failed to open %s (%d).\n" | ||
| 148 | "Please check directory permissions.", | ||
| 149 | path.c_str(), errno); | ||
| 150 | } | ||
| 151 |
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58116 | Notify(fn_enter_dir, parent_path, dir_name); |
| 152 | |||
| 153 | // Walk through the open directory notifying the user about contents | ||
| 154 |
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2335143 | while ((dit = platform_readdir(dip)) != NULL) { |
| 155 | // Check if file should be ignored | ||
| 156 |
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2277027 | if (std::string(dit->d_name) == "." || std::string(dit->d_name) == "..") { |
| 157 | 116862 | continue; | |
| 158 |
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2160795 | } else if (fn_ignore_file != NULL) { |
| 159 |
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17850 | if (Notify(fn_ignore_file, path, dit->d_name)) { |
| 160 |
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630 | LogCvmfs(kLogFsTraversal, kLogVerboseMsg, "ignoring %s/%s", |
| 161 | 630 | path.c_str(), dit->d_name); | |
| 162 | 630 | continue; | |
| 163 | } | ||
| 164 | } else { | ||
| 165 |
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2142945 | LogCvmfs(kLogFsTraversal, kLogVerboseMsg, |
| 166 | "not ignoring %s/%s (fn_ignore_file not set)", path.c_str(), | ||
| 167 | 2142945 | dit->d_name); | |
| 168 | } | ||
| 169 | |||
| 170 | // Notify user about found directory entry | ||
| 171 | platform_stat64 info; | ||
| 172 |
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2160165 | const int retval = platform_lstat((path + "/" + dit->d_name).c_str(), |
| 173 | &info); | ||
| 174 |
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2160165 | if (retval != 0) { |
| 175 | ✗ | PANIC(kLogStderr, "failed to lstat '%s' errno: %d", | |
| 176 | (path + "/" + dit->d_name).c_str(), errno); | ||
| 177 | } | ||
| 178 |
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2160165 | if (S_ISDIR(info.st_mode)) { |
| 179 |
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1969363 | LogCvmfs(kLogFsTraversal, kLogVerboseMsg, "passing directory %s/%s", |
| 180 | 1969363 | path.c_str(), dit->d_name); | |
| 181 |
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1969363 | if (Notify(fn_new_dir_prefix, path, dit->d_name) && recurse_) { |
| 182 |
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33371 | DoRecursion(path, dit->d_name); |
| 183 | } | ||
| 184 |
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1969363 | Notify(fn_new_dir_postfix, path, dit->d_name); |
| 185 |
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190802 | } else if (S_ISREG(info.st_mode)) { |
| 186 |
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97165 | LogCvmfs(kLogFsTraversal, kLogVerboseMsg, "passing regular file %s/%s", |
| 187 | 97165 | path.c_str(), dit->d_name); | |
| 188 |
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97165 | Notify(fn_new_file, path, dit->d_name); |
| 189 |
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93637 | } else if (S_ISLNK(info.st_mode)) { |
| 190 |
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80350 | LogCvmfs(kLogFsTraversal, kLogVerboseMsg, "passing symlink %s/%s", |
| 191 | 80350 | path.c_str(), dit->d_name); | |
| 192 |
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80350 | Notify(fn_new_symlink, path, dit->d_name); |
| 193 |
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13287 | } else if (S_ISSOCK(info.st_mode)) { |
| 194 |
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1457 | LogCvmfs(kLogFsTraversal, kLogVerboseMsg, "passing socket %s/%s", |
| 195 | 1457 | path.c_str(), dit->d_name); | |
| 196 |
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1457 | Notify(fn_new_socket, path, dit->d_name); |
| 197 |
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11830 | } else if (S_ISBLK(info.st_mode)) { |
| 198 |
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840 | LogCvmfs(kLogFsTraversal, kLogVerboseMsg, "passing block-device %s/%s", |
| 199 | 840 | path.c_str(), dit->d_name); | |
| 200 |
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840 | Notify(fn_new_block_dev, path, dit->d_name); |
| 201 |
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10990 | } else if (S_ISCHR(info.st_mode)) { |
| 202 |
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9520 | LogCvmfs(kLogFsTraversal, kLogVerboseMsg, |
| 203 | "passing character-device " | ||
| 204 | "%s/%s", | ||
| 205 | 9520 | path.c_str(), dit->d_name); | |
| 206 |
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9520 | Notify(fn_new_character_dev, path, dit->d_name); |
| 207 |
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1470 | } else if (S_ISFIFO(info.st_mode)) { |
| 208 |
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1470 | LogCvmfs(kLogFsTraversal, kLogVerboseMsg, "passing FIFO %s/%s", |
| 209 | 1470 | path.c_str(), dit->d_name); | |
| 210 |
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1470 | Notify(fn_new_fifo, path, dit->d_name); |
| 211 | } else { | ||
| 212 | ✗ | LogCvmfs(kLogFsTraversal, kLogVerboseMsg, "unknown file type %s/%s", | |
| 213 | ✗ | path.c_str(), dit->d_name); | |
| 214 | } | ||
| 215 | } | ||
| 216 | |||
| 217 | // Close directory and notify user | ||
| 218 |
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58116 | closedir(dip); |
| 219 |
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58116 | LogCvmfs(kLogFsTraversal, kLogVerboseMsg, "leaving %s", path.c_str()); |
| 220 |
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58116 | Notify(fn_leave_dir, parent_path, dir_name); |
| 221 | 58116 | } | |
| 222 | |||
| 223 | 1987213 | inline bool Notify(const BoolCallback callback, | |
| 224 | const std::string &parent_path, | ||
| 225 | const std::string &entry_name) const { | ||
| 226 |
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3699146 | return (callback == NULL) ? true |
| 227 |
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3699146 | : (delegate_->*callback)( |
| 228 |
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3974426 | GetRelativePath(parent_path), entry_name); |
| 229 | } | ||
| 230 | |||
| 231 | 2276397 | inline void Notify(const VoidCallback callback, | |
| 232 | const std::string &parent_path, | ||
| 233 | const std::string &entry_name) const { | ||
| 234 |
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2276397 | if (callback != NULL) { |
| 235 |
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245270 | (delegate_->*callback)(GetRelativePath(parent_path), entry_name); |
| 236 | } | ||
| 237 | 2276397 | } | |
| 238 | |||
| 239 | 1887939 | std::string GetRelativePath(const std::string &absolute_path) const { | |
| 240 | 1887939 | const unsigned int rel_dir_len = relative_to_directory_.length(); | |
| 241 |
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1887939 | if (rel_dir_len >= absolute_path.length()) { |
| 242 |
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10885 | return ""; |
| 243 |
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1877054 | } else if (rel_dir_len > 1) { |
| 244 | 18970 | return absolute_path.substr(rel_dir_len + 1); | |
| 245 |
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1858084 | } else if (rel_dir_len == 0) { |
| 246 | 1858084 | return absolute_path; | |
| 247 | ✗ | } else if (relative_to_directory_ == "/") { | |
| 248 | ✗ | return absolute_path.substr(1); | |
| 249 | } | ||
| 250 | |||
| 251 | ✗ | return ""; | |
| 252 | } | ||
| 253 | }; // FileSystemTraversal | ||
| 254 | |||
| 255 | #ifdef CVMFS_NAMESPACE_GUARD | ||
| 256 | } // namespace CVMFS_NAMESPACE_GUARD | ||
| 257 | #endif | ||
| 258 | |||
| 259 | #endif // CVMFS_UTIL_FS_TRAVERSAL_H_ | ||
| 260 |