1 /* Recursively descend the filesystem and visit each file. */
23 static OutputStream *info_dump = NULL;
25 void scandir(const string& path);
27 /* Converts time to microseconds since the epoch. */
28 int64_t encode_time(time_t time)
30 return (int64_t)time * 1000000;
33 void dumpfile(int fd, dictionary &file_info)
41 if ((stat_buf.st_mode & S_IFMT) != S_IFREG) {
42 printf("file is no longer a regular file!\n");
48 ssize_t res = read(fd, buf, sizeof(buf));
52 printf("Error while reading: %m\n");
54 } else if (res == 0) {
57 hash.process(buf, res);
62 file_info["sha1"] = string((const char *)hash.checksum(),
63 hash.checksum_size());
66 void scanfile(const string& path)
76 lstat(path.c_str(), &stat_buf);
78 printf("%s\n", path.c_str());
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) {
105 /* Use the reported file size to allocate a buffer large enough to read
106 * the symlink. Allocate slightly more space, so that we ask for more
107 * bytes than we expect and so check for truncation. */
108 buf = new char[stat_buf.st_size + 2];
109 len = readlink(path.c_str(), buf, stat_buf.st_size + 1);
111 printf("error reading symlink: %m\n");
112 } else if (len <= stat_buf.st_size) {
114 printf(" contents=%s\n", buf);
115 } else if (len > stat_buf.st_size) {
116 printf("error reading symlink: name truncated\n");
119 file_info["contents"] = buf;
126 /* Be paranoid when opening the file. We have no guarantee that the
127 * file was not replaced between the stat() call above and the open()
128 * call below, so we might not even be opening a regular file. That
129 * the file descriptor refers to a regular file is checked in
130 * dumpfile(). But we also supply flags to open to to guard against
131 * various conditions before we can perform that verification:
132 * - O_NOFOLLOW: in the event the file was replaced by a symlink
133 * - O_NONBLOCK: prevents open() from blocking if the file was
135 * We also add in O_NOATIME, since this may reduce disk writes (for
137 fd = open(path.c_str(), O_RDONLY|O_NOATIME|O_NOFOLLOW|O_NONBLOCK);
139 /* Drop the use of the O_NONBLOCK flag; we only wanted that for file
141 flags = fcntl(fd, F_GETFL);
142 fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
144 file_info["size"] = encode_u64(stat_buf.st_size);
145 dumpfile(fd, file_info);
155 fprintf(stderr, "Unknown inode type: mode=%x\n", stat_buf.st_mode);
159 file_info["type"] = string(1, inode_type);
161 info_dump->write_string(path);
162 info_dump->write_dictionary(file_info);
165 void scandir(const string& path)
167 DIR *dir = opendir(path.c_str());
170 printf("Error: %m\n");
175 vector<string> contents;
176 while ((ent = readdir(dir)) != NULL) {
177 string filename(ent->d_name);
178 if (filename == "." || filename == "..")
180 contents.push_back(filename);
183 sort(contents.begin(), contents.end());
185 for (vector<string>::iterator i = contents.begin();
186 i != contents.end(); ++i) {
187 const string& filename = *i;
188 scanfile(path + "/" + filename);
194 int main(int argc, char *argv[])
196 FILE *dump = fopen("fileinfo", "w");
198 fprintf(stderr, "Cannot open fileinfo: %m\n");
202 FileOutputStream os(dump);
207 } catch (IOException e) {
208 fprintf(stderr, "IOException: %s\n", e.getError().c_str());