#include <stdlib.h>
#include <stdint.h>
#include <dirent.h>
+#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
+#include <algorithm>
#include <string>
+#include <list>
+#include <vector>
+#include <iostream>
+#include <sstream>
+#include "format.h"
+#include "store.h"
+#include "sha1.h"
+
+using std::list;
using std::string;
+using std::vector;
+using std::ostream;
+
+static TarSegmentStore *tss = NULL;
+
+/* Buffer for holding a single block of data read from a file. */
+static const int LBS_BLOCK_SIZE = 1024 * 1024;
+static char *block_buf;
+
+void scandir(const string& path, std::ostream& metadata);
+
+/* Converts time to microseconds since the epoch. */
+int64_t encode_time(time_t time)
+{
+ return (int64_t)time * 1000000;
+}
+
+/* Read data from a file descriptor and return the amount of data read. A
+ * short read (less than the requested size) will only occur if end-of-file is
+ * hit. */
+size_t file_read(int fd, char *buf, size_t maxlen)
+{
+ size_t bytes_read = 0;
+
+ while (true) {
+ ssize_t res = read(fd, buf, maxlen);
+ if (res < 0) {
+ if (errno == EINTR)
+ continue;
+ throw IOException("file_read: error reading");
+ } else if (res == 0) {
+ break;
+ } else {
+ bytes_read += res;
+ buf += res;
+ maxlen -= res;
+ }
+ }
-void scandir(const string& path);
+ return bytes_read;
+}
-void scanfile(const string& path)
+/* Read the contents of a file (specified by an open file descriptor) and copy
+ * the data to the store. */
+void dumpfile(int fd, dictionary &file_info, ostream &metadata)
{
struct stat stat_buf;
+ fstat(fd, &stat_buf);
+ int64_t size = 0;
+ list<string> segment_list;
+
+ if ((stat_buf.st_mode & S_IFMT) != S_IFREG) {
+ printf("file is no longer a regular file!\n");
+ return;
+ }
+
+ /* The index data consists of a sequence of pointers to the data blocks
+ * that actually comprise the file data. This level of indirection is used
+ * so that the same data block can be used in multiple files, or multiple
+ * versions of the same file. */
+ SHA1Checksum hash;
+ while (true) {
+ size_t bytes = file_read(fd, block_buf, LBS_BLOCK_SIZE);
+ if (bytes == 0)
+ break;
+
+ hash.process(block_buf, bytes);
+
+ // tarstore processing
+ LbsObject *o = new LbsObject;
+ o->set_group("data");
+ o->set_data(block_buf, bytes);
+ o->write(tss);
+ segment_list.push_back(o->get_name());
+ delete o;
+
+ size += bytes;
+ }
+
+ file_info["checksum"] = hash.checksum_str();
+
+ /* For files that only need to be broken apart into a few objects, store
+ * the list of objects directly. For larger files, store the data
+ * out-of-line and provide a pointer to the indrect object. */
+ if (segment_list.size() < 8) {
+ string blocklist = "";
+ for (list<string>::iterator i = segment_list.begin();
+ i != segment_list.end(); ++i) {
+ if (i != segment_list.begin())
+ blocklist += " ";
+ blocklist += *i;
+ }
+ file_info["data"] = blocklist;
+ } else {
+ string blocklist = "";
+ for (list<string>::iterator i = segment_list.begin();
+ i != segment_list.end(); ++i) {
+ blocklist += *i + "\n";
+ }
+
+ LbsObject *i = new LbsObject;
+ i->set_group("indirect");
+ i->set_data(blocklist.data(), blocklist.size());
+ i->write(tss);
+ file_info["data"] = "@" + i->get_name();
+ delete i;
+ }
+}
+
+void scanfile(const string& path, ostream &metadata)
+{
+ int fd;
+ long flags;
+ struct stat stat_buf;
+ char *buf;
+ ssize_t len;
+ list<string> refs;
+
+ // 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());
+
+ metadata << "name: " << uri_encode(path) << "\n";
+
+ file_info["mode"] = encode_int(stat_buf.st_mode & 07777);
+ file_info["atime"] = encode_int(stat_buf.st_atime);
+ file_info["ctime"] = encode_int(stat_buf.st_ctime);
+ file_info["mtime"] = encode_int(stat_buf.st_mtime);
+ file_info["user"] = encode_int(stat_buf.st_uid);
+ file_info["group"] = encode_int(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"] = uri_encode(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_int(stat_buf.st_size);
+ dumpfile(fd, file_info, metadata);
+ 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);
+ metadata << "type: " << inode_type << "\n";
+
+ dict_output(metadata, file_info);
+ metadata << "\n";
+
+ // If we hit a directory, now that we've written the directory itself,
+ // recursively scan the directory.
+ if (recurse)
+ scandir(path, metadata);
}
-void scandir(const string& path)
+void scandir(const string& path, ostream &metadata)
{
- printf("Scan directory: %s\n", path.c_str());
-
DIR *dir = opendir(path.c_str());
if (dir == NULL) {
}
struct dirent *ent;
+ vector<string> contents;
while ((ent = readdir(dir)) != NULL) {
string filename(ent->d_name);
if (filename == "." || filename == "..")
continue;
- printf(" d_name = '%s'\n", filename.c_str());
- scanfile(path + "/" + filename);
+ contents.push_back(filename);
+ }
+
+ sort(contents.begin(), contents.end());
+
+ for (vector<string>::iterator i = contents.begin();
+ i != contents.end(); ++i) {
+ const string& filename = *i;
+ scanfile(path + "/" + filename, metadata);
}
closedir(dir);
int main(int argc, char *argv[])
{
- scandir(".");
+ block_buf = new char[LBS_BLOCK_SIZE];
+
+ if (argc > 1) {
+ tss = new TarSegmentStore(argv[1]);
+ } else {
+ tss = new TarSegmentStore(".");
+ }
+
+ std::ostringstream metadata;
+
+ try {
+ scanfile(".", metadata);
+ } catch (IOException e) {
+ fprintf(stderr, "IOException: %s\n", e.getError().c_str());
+ }
+
+ const string md = metadata.str();
+
+ LbsObject *r = new LbsObject;
+ r->set_group("root");
+ r->set_data(md.data(), md.size());
+ r->write(tss);
+ delete r;
+
+ tss->sync();
+ delete tss;
return 0;
}
projects / cumulus.git / blobdiff