GCC Code Coverage Report


Directory: cvmfs/
File: cvmfs/util/fs_traversal.h
Date: 2025-10-05 02:35:40
Exec Total Coverage
Lines: 92 99 92.9%
Branches: 127 245 51.8%

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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 17074 FileSystemTraversal(T *delegate,
87 const std::string &relative_to_directory,
88 const bool recurse)
89 17074 : fn_enter_dir(NULL)
90 17074 , fn_leave_dir(NULL)
91 17074 , fn_new_file(NULL)
92 17074 , fn_new_symlink(NULL)
93 17074 , fn_new_socket(NULL)
94 17074 , fn_new_block_dev(NULL)
95 17074 , fn_new_character_dev(NULL)
96 17074 , fn_new_fifo(NULL)
97 17074 , fn_ignore_file(NULL)
98 17074 , fn_new_dir_prefix(NULL)
99 17074 , fn_new_dir_postfix(NULL)
100 17074 , delegate_(delegate)
101 17074 , relative_to_directory_(relative_to_directory)
102 17074 , recurse_(recurse) {
103 17074 Init();
104 17074 }
105
106 /**
107 * Start the recursion.
108 * @param dir_path The directory to start the recursion at
109 */
110 17074 void Recurse(const std::string &dir_path) const {
111
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17074 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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17074 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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17074 DoRecursion(dir_path, "");
121 17074 }
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 17074 void Init() { }
133
134 37945 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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37945 const std::string path = parent_path
139
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75890 + ((!dir_name.empty()) ? ("/" + dir_name) : "");
140
141 // Change into directory and notify the user
142
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37945 LogCvmfs(kLogFsTraversal, kLogVerboseMsg, "entering %s (%s -- %s)",
143 path.c_str(), parent_path.c_str(), dir_name.c_str());
144
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37945 dip = opendir(path.c_str());
145
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37945 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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37945 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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940403 while ((dit = platform_readdir(dip)) != NULL) {
155 // Check if file should be ignored
156
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902458 if (std::string(dit->d_name) == "." || std::string(dit->d_name) == "..") {
157 76448 continue;
158
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826568 } else if (fn_ignore_file != NULL) {
159
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15810 if (Notify(fn_ignore_file, path, dit->d_name)) {
160
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558 LogCvmfs(kLogFsTraversal, kLogVerboseMsg, "ignoring %s/%s",
161 558 path.c_str(), dit->d_name);
162 558 continue;
163 }
164 } else {
165
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810758 LogCvmfs(kLogFsTraversal, kLogVerboseMsg,
166 "not ignoring %s/%s (fn_ignore_file not set)", path.c_str(),
167 810758 dit->d_name);
168 }
169
170 // Notify user about found directory entry
171 platform_stat64 info;
172
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826010 const int retval = platform_lstat((path + "/" + dit->d_name).c_str(),
173 &info);
174
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826010 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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826010 if (S_ISDIR(info.st_mode)) {
179
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676621 LogCvmfs(kLogFsTraversal, kLogVerboseMsg, "passing directory %s/%s",
180 676621 path.c_str(), dit->d_name);
181
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676621 if (Notify(fn_new_dir_prefix, path, dit->d_name) && recurse_) {
182
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20871 DoRecursion(path, dit->d_name);
183 }
184
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676621 Notify(fn_new_dir_postfix, path, dit->d_name);
185
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149389 } else if (S_ISREG(info.st_mode)) {
186
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59714 LogCvmfs(kLogFsTraversal, kLogVerboseMsg, "passing regular file %s/%s",
187 59714 path.c_str(), dit->d_name);
188
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59714 Notify(fn_new_file, path, dit->d_name);
189
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89675 } else if (S_ISLNK(info.st_mode)) {
190
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77767 LogCvmfs(kLogFsTraversal, kLogVerboseMsg, "passing symlink %s/%s",
191 77767 path.c_str(), dit->d_name);
192
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77767 Notify(fn_new_symlink, path, dit->d_name);
193
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11908 } else if (S_ISSOCK(info.st_mode)) {
194
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1430 LogCvmfs(kLogFsTraversal, kLogVerboseMsg, "passing socket %s/%s",
195 1430 path.c_str(), dit->d_name);
196
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1430 Notify(fn_new_socket, path, dit->d_name);
197
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10478 } else if (S_ISBLK(info.st_mode)) {
198
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744 LogCvmfs(kLogFsTraversal, kLogVerboseMsg, "passing block-device %s/%s",
199 744 path.c_str(), dit->d_name);
200
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744 Notify(fn_new_block_dev, path, dit->d_name);
201
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9734 } else if (S_ISCHR(info.st_mode)) {
202
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8432 LogCvmfs(kLogFsTraversal, kLogVerboseMsg,
203 "passing character-device "
204 "%s/%s",
205 8432 path.c_str(), dit->d_name);
206
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8432 Notify(fn_new_character_dev, path, dit->d_name);
207
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1302 } else if (S_ISFIFO(info.st_mode)) {
208
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1302 LogCvmfs(kLogFsTraversal, kLogVerboseMsg, "passing FIFO %s/%s",
209 1302 path.c_str(), dit->d_name);
210
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1302 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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37945 closedir(dip);
219
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37945 LogCvmfs(kLogFsTraversal, kLogVerboseMsg, "leaving %s", path.c_str());
220
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37945 Notify(fn_leave_dir, parent_path, dir_name);
221 37945 }
222
223 692431 inline bool Notify(const BoolCallback callback,
224 const std::string &parent_path,
225 const std::string &entry_name) const {
226
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1349174 return (callback == NULL) ? true
227
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1349174 : (delegate_->*callback)(
228
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1384862 GetRelativePath(parent_path), entry_name);
229 }
230
231 901900 inline void Notify(const VoidCallback callback,
232 const std::string &parent_path,
233 const std::string &entry_name) const {
234
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901900 if (callback != NULL) {
235
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191752 (delegate_->*callback)(GetRelativePath(parent_path), entry_name);
236 }
237 901900 }
238
239 783895 std::string GetRelativePath(const std::string &absolute_path) const {
240 783895 const unsigned int rel_dir_len = relative_to_directory_.length();
241
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783895 if (rel_dir_len >= absolute_path.length()) {
242
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9641 return "";
243
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774254 } else if (rel_dir_len > 1) {
244 16802 return absolute_path.substr(rel_dir_len + 1);
245
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757452 } else if (rel_dir_len == 0) {
246 757452 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