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());
75 printf(" ino=%Ld, perm=%04o, uid=%d, gid=%d, nlink=%d, blksize=%d, size=%Ld\n",
76 (int64_t)stat_buf.st_ino, stat_buf.st_mode & 07777,
77 stat_buf.st_uid, stat_buf.st_gid, stat_buf.st_nlink,
78 (int)stat_buf.st_blksize, (int64_t)stat_buf.st_size);
80 file_info["mode"] = encode_u16(stat_buf.st_mode & 07777);
81 file_info["atime"] = encode_u64(encode_time(stat_buf.st_atime));
82 file_info["ctime"] = encode_u64(encode_time(stat_buf.st_ctime));
83 file_info["mtime"] = encode_u64(encode_time(stat_buf.st_mtime));
84 file_info["user"] = encode_u32(stat_buf.st_uid);
85 file_info["group"] = encode_u32(stat_buf.st_gid);
89 switch (stat_buf.st_mode & S_IFMT) {
99 printf(" character device\n");
103 printf(" block device\n");
107 printf(" symlink\n");
110 /* Use the reported file size to allocate a buffer large enough to read
111 * the symlink. Allocate slightly more space, so that we ask for more
112 * bytes than we expect and so check for truncation. */
113 buf = new char[stat_buf.st_size + 2];
114 len = readlink(path.c_str(), buf, stat_buf.st_size + 1);
116 printf("error reading symlink: %m\n");
117 } else if (len <= stat_buf.st_size) {
119 printf(" contents=%s\n", buf);
120 } else if (len > stat_buf.st_size) {
121 printf("error reading symlink: name truncated\n");
124 file_info["contents"] = buf;
129 printf(" regular file\n");
132 /* Be paranoid when opening the file. We have no guarantee that the
133 * file was not replaced between the stat() call above and the open()
134 * call below, so we might not even be opening a regular file. That
135 * the file descriptor refers to a regular file is checked in
136 * dumpfile(). But we also supply flags to open to to guard against
137 * various conditions before we can perform that verification:
138 * - O_NOFOLLOW: in the event the file was replaced by a symlink
139 * - O_NONBLOCK: prevents open() from blocking if the file was
141 * We also add in O_NOATIME, since this may reduce disk writes (for
143 fd = open(path.c_str(), O_RDONLY|O_NOATIME|O_NOFOLLOW|O_NONBLOCK);
145 /* Drop the use of the O_NONBLOCK flag; we only wanted that for file
147 flags = fcntl(fd, F_GETFL);
148 fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
151 file_info["size"] = encode_u64(stat_buf.st_size);
156 printf(" directory\n");
162 fprintf(stderr, "Unknown inode type: mode=%x\n", stat_buf.st_mode);
166 file_info["type"] = string(1, inode_type);
168 info_dump->write_string(path);
169 info_dump->write_dictionary(file_info);
172 void scandir(const string& path)
174 DIR *dir = opendir(path.c_str());
177 printf("Error: %m\n");
182 vector<string> contents;
183 while ((ent = readdir(dir)) != NULL) {
184 string filename(ent->d_name);
185 if (filename == "." || filename == "..")
187 contents.push_back(filename);
190 sort(contents.begin(), contents.end());
192 for (vector<string>::iterator i = contents.begin();
193 i != contents.end(); ++i) {
194 const string& filename = *i;
195 scanfile(path + "/" + filename);
201 int main(int argc, char *argv[])
203 FILE *dump = fopen("fileinfo", "w");
205 fprintf(stderr, "Cannot open fileinfo: %m\n");
209 FileOutputStream os(dump);
214 } catch (IOException e) {
215 fprintf(stderr, "IOException: %s\n", e.getError().c_str());