X-Git-Url: http://git.vrable.net/?a=blobdiff_plain;f=scandir.cc;h=98285aca0b700fbd0831261a2545fc7d2d66dec4;hb=08721c894385b530ed501498a02d824b8eba7228;hp=7e02f2708becbb1041a8dbb85ff306530b0a239b;hpb=ce15b42a3385cb50dab7f8a58bf310ba5a57958e;p=cumulus.git diff --git a/scandir.cc b/scandir.cc index 7e02f27..98285ac 100644 --- a/scandir.cc +++ b/scandir.cc @@ -4,50 +4,174 @@ #include #include #include +#include #include #include #include #include +#include #include +#include + +#include "store.h" +#include "sha1.h" using std::string; +using std::vector; + +static OutputStream *info_dump = NULL; void scandir(const string& path); +/* Converts time to microseconds since the epoch. */ +int64_t encode_time(time_t time) +{ + return (int64_t)time * 1000000; +} + +void dumpfile(int fd, dictionary &file_info) +{ + struct stat stat_buf; + fstat(fd, &stat_buf); + int64_t size = 0; + + char buf[4096]; + + if ((stat_buf.st_mode & S_IFMT) != S_IFREG) { + printf("file is no longer a regular file!\n"); + return; + } + + SHA1Checksum hash; + while (true) { + ssize_t res = read(fd, buf, sizeof(buf)); + if (res < 0) { + if (errno == EINTR) + continue; + printf("Error while reading: %m\n"); + return; + } else if (res == 0) { + break; + } else { + hash.process(buf, res); + size += res; + } + } + + file_info["sha1"] = string((const char *)hash.checksum(), + hash.checksum_size()); +} + void scanfile(const string& path) { + int fd; + long flags; struct stat stat_buf; + char *buf; + ssize_t len; + + // Set to true if the item is a directory and we should recursively scan + bool recurse = false; + + dictionary file_info; + lstat(path.c_str(), &stat_buf); - printf("%s:\n", path.c_str()); - printf(" ino=%Ld, perm=%04o, uid=%d, gid=%d, nlink=%d, blksize=%d, size=%Ld\n", - (int64_t)stat_buf.st_ino, stat_buf.st_mode & 07777, - stat_buf.st_uid, stat_buf.st_gid, stat_buf.st_nlink, - (int)stat_buf.st_blksize, (int64_t)stat_buf.st_size); + printf("%s\n", path.c_str()); + + file_info["mode"] = encode_u16(stat_buf.st_mode & 07777); + file_info["atime"] = encode_u64(encode_time(stat_buf.st_atime)); + file_info["ctime"] = encode_u64(encode_time(stat_buf.st_ctime)); + file_info["mtime"] = encode_u64(encode_time(stat_buf.st_mtime)); + file_info["user"] = encode_u32(stat_buf.st_uid); + file_info["group"] = encode_u32(stat_buf.st_gid); + + char inode_type; switch (stat_buf.st_mode & S_IFMT) { case S_IFIFO: + inode_type = 'p'; + break; case S_IFSOCK: + inode_type = 's'; + break; case S_IFCHR: + inode_type = 'c'; + break; case S_IFBLK: + inode_type = 'b'; + break; case S_IFLNK: - printf(" special file\n"); + inode_type = 'l'; + + /* Use the reported file size to allocate a buffer large enough to read + * the symlink. Allocate slightly more space, so that we ask for more + * bytes than we expect and so check for truncation. */ + buf = new char[stat_buf.st_size + 2]; + len = readlink(path.c_str(), buf, stat_buf.st_size + 1); + if (len < 0) { + printf("error reading symlink: %m\n"); + } else if (len <= stat_buf.st_size) { + buf[len] = '\0'; + printf(" contents=%s\n", buf); + } else if (len > stat_buf.st_size) { + printf("error reading symlink: name truncated\n"); + } + + file_info["contents"] = buf; + + delete[] buf; break; case S_IFREG: - printf(" regular file\n"); + inode_type = '-'; + + /* Be paranoid when opening the file. We have no guarantee that the + * file was not replaced between the stat() call above and the open() + * call below, so we might not even be opening a regular file. That + * the file descriptor refers to a regular file is checked in + * dumpfile(). But we also supply flags to open to to guard against + * various conditions before we can perform that verification: + * - O_NOFOLLOW: in the event the file was replaced by a symlink + * - O_NONBLOCK: prevents open() from blocking if the file was + * replaced by a fifo + * We also add in O_NOATIME, since this may reduce disk writes (for + * inode updates). */ + fd = open(path.c_str(), O_RDONLY|O_NOATIME|O_NOFOLLOW|O_NONBLOCK); + + /* Drop the use of the O_NONBLOCK flag; we only wanted that for file + * open. */ + flags = fcntl(fd, F_GETFL); + fcntl(fd, F_SETFL, flags & ~O_NONBLOCK); + + file_info["size"] = encode_u64(stat_buf.st_size); + dumpfile(fd, file_info); + close(fd); + break; case S_IFDIR: - printf(" directory\n"); - scandir(path); + inode_type = 'd'; + recurse = true; break; + + default: + fprintf(stderr, "Unknown inode type: mode=%x\n", stat_buf.st_mode); + return; } + + file_info["type"] = string(1, inode_type); + + info_dump->write_string(path); + info_dump->write_dictionary(file_info); + + // If we hit a directory, now that we've written the directory itself, + // recursively scan the directory. + if (recurse) + scandir(path); } void scandir(const string& path) { - printf("Scan directory: %s\n", path.c_str()); - DIR *dir = opendir(path.c_str()); if (dir == NULL) { @@ -56,11 +180,19 @@ void scandir(const string& path) } struct dirent *ent; + vector contents; while ((ent = readdir(dir)) != NULL) { string filename(ent->d_name); if (filename == "." || filename == "..") continue; - printf(" d_name = '%s'\n", filename.c_str()); + contents.push_back(filename); + } + + sort(contents.begin(), contents.end()); + + for (vector::iterator i = contents.begin(); + i != contents.end(); ++i) { + const string& filename = *i; scanfile(path + "/" + filename); } @@ -69,7 +201,25 @@ void scandir(const string& path) int main(int argc, char *argv[]) { - scandir("."); + struct uuid id = SegmentWriter::generate_uuid(); + string filename = SegmentWriter::format_uuid(id); + + printf("Backup UUID: %s\n", filename.c_str()); + FILE *dump = fopen(filename.c_str(), "w"); + if (dump == NULL) { + fprintf(stderr, "Cannot open file %s: %m\n", filename.c_str()); + return 1; + } + + FileOutputStream os(dump); + SegmentWriter sw(os, id); + info_dump = sw.new_object(); + + try { + scanfile("."); + } catch (IOException e) { + fprintf(stderr, "IOException: %s\n", e.getError().c_str()); + } return 0; }