1 /* Recursively descend the filesystem and visit each file. */
22 static OutputStream *info_dump = NULL;
24 void scandir(const string& path);
26 /* Converts time to microseconds since the epoch. */
27 int64_t encode_time(time_t time)
29 return (int64_t)time * 1000000;
40 if ((stat_buf.st_mode & S_IFMT) != S_IFREG) {
41 printf("file is no longer a regular file!\n");
46 ssize_t res = read(fd, buf, sizeof(buf));
50 printf("Error while reading: %m\n");
52 } else if (res == 0) {
59 printf(" bytes=%Ld\n", size);
62 void scanfile(const string& path)
72 lstat(path.c_str(), &stat_buf);
74 printf("%s\n", path.c_str());
76 file_info["mode"] = encode_u16(stat_buf.st_mode & 07777);
77 file_info["atime"] = encode_u64(encode_time(stat_buf.st_atime));
78 file_info["ctime"] = encode_u64(encode_time(stat_buf.st_ctime));
79 file_info["mtime"] = encode_u64(encode_time(stat_buf.st_mtime));
80 file_info["user"] = encode_u32(stat_buf.st_uid);
81 file_info["group"] = encode_u32(stat_buf.st_gid);
85 switch (stat_buf.st_mode & S_IFMT) {
101 /* Use the reported file size to allocate a buffer large enough to read
102 * the symlink. Allocate slightly more space, so that we ask for more
103 * bytes than we expect and so check for truncation. */
104 buf = new char[stat_buf.st_size + 2];
105 len = readlink(path.c_str(), buf, stat_buf.st_size + 1);
107 printf("error reading symlink: %m\n");
108 } else if (len <= stat_buf.st_size) {
110 printf(" contents=%s\n", buf);
111 } else if (len > stat_buf.st_size) {
112 printf("error reading symlink: name truncated\n");
115 file_info["contents"] = buf;
122 /* Be paranoid when opening the file. We have no guarantee that the
123 * file was not replaced between the stat() call above and the open()
124 * call below, so we might not even be opening a regular file. That
125 * the file descriptor refers to a regular file is checked in
126 * dumpfile(). But we also supply flags to open to to guard against
127 * various conditions before we can perform that verification:
128 * - O_NOFOLLOW: in the event the file was replaced by a symlink
129 * - O_NONBLOCK: prevents open() from blocking if the file was
131 * We also add in O_NOATIME, since this may reduce disk writes (for
133 fd = open(path.c_str(), O_RDONLY|O_NOATIME|O_NOFOLLOW|O_NONBLOCK);
135 /* Drop the use of the O_NONBLOCK flag; we only wanted that for file
137 flags = fcntl(fd, F_GETFL);
138 fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
141 file_info["size"] = encode_u64(stat_buf.st_size);
151 fprintf(stderr, "Unknown inode type: mode=%x\n", stat_buf.st_mode);
155 file_info["type"] = string(1, inode_type);
157 info_dump->write_string(path);
158 info_dump->write_dictionary(file_info);
161 void scandir(const string& path)
163 DIR *dir = opendir(path.c_str());
166 printf("Error: %m\n");
171 vector<string> contents;
172 while ((ent = readdir(dir)) != NULL) {
173 string filename(ent->d_name);
174 if (filename == "." || filename == "..")
176 contents.push_back(filename);
179 sort(contents.begin(), contents.end());
181 for (vector<string>::iterator i = contents.begin();
182 i != contents.end(); ++i) {
183 const string& filename = *i;
184 scanfile(path + "/" + filename);
190 int main(int argc, char *argv[])
192 FILE *dump = fopen("fileinfo", "w");
194 fprintf(stderr, "Cannot open fileinfo: %m\n");
198 FileOutputStream os(dump);
203 } catch (IOException e) {
204 fprintf(stderr, "IOException: %s\n", e.getError().c_str());