#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 OutputStream *info_dump = NULL;
+static TarSegmentStore *tss = NULL;
-void scandir(const string& path);
+/* 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;
}
-void dumpfile(int fd, dictionary &file_info)
+/* 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;
+ }
+ }
+
+ return bytes_read;
+}
+
+/* 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;
-
- char buf[4096];
+ 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) {
- 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) {
+ size_t bytes = file_read(fd, block_buf, LBS_BLOCK_SIZE);
+ if (bytes == 0)
break;
- } else {
- hash.process(buf, res);
- size += res;
- }
+
+ 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["sha1"] = string((const char *)hash.checksum(),
- hash.checksum_size());
+ 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)
+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;
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);
+ 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;
printf("error reading symlink: name truncated\n");
}
- file_info["contents"] = buf;
+ file_info["contents"] = uri_encode(buf);
delete[] buf;
break;
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);
+ file_info["size"] = encode_int(stat_buf.st_size);
+ dumpfile(fd, file_info, metadata);
close(fd);
break;
}
file_info["type"] = string(1, inode_type);
+ metadata << "type: " << inode_type << "\n";
- info_dump->write_string(path);
- info_dump->write_dictionary(file_info);
+ 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);
+ scandir(path, metadata);
}
-void scandir(const string& path)
+void scandir(const string& path, ostream &metadata)
{
DIR *dir = opendir(path.c_str());
for (vector<string>::iterator i = contents.begin();
i != contents.end(); ++i) {
const string& filename = *i;
- scanfile(path + "/" + filename);
+ scanfile(path + "/" + filename, metadata);
}
closedir(dir);
int main(int argc, char *argv[])
{
- 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;
+ block_buf = new char[LBS_BLOCK_SIZE];
+
+ if (argc > 1) {
+ tss = new TarSegmentStore(argv[1]);
+ } else {
+ tss = new TarSegmentStore(".");
}
- FileOutputStream os(dump);
- SegmentWriter sw(os, id);
- info_dump = sw.new_object();
+ std::ostringstream metadata;
try {
- scanfile(".");
+ 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