#include <list>
#include <vector>
#include <iostream>
+#include <fstream>
#include <sstream>
+#include <set>
#include "format.h"
#include "store.h"
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 const size_t LBS_BLOCK_SIZE = 1024 * 1024;
static char *block_buf;
-void scandir(const string& path, std::ostream& metadata);
+static const size_t LBS_METADATA_BLOCK_SIZE = 65536;
-/* Converts time to microseconds since the epoch. */
-int64_t encode_time(time_t time)
+/* Contents of the root object. This will contain a set of indirect links to
+ * the metadata objects. */
+std::ostringstream metadata_root;
+
+/* Buffer for building up metadata. */
+std::ostringstream metadata;
+
+/* Keep track of all segments which are needed to reconstruct the snapshot. */
+std::set<string> segment_list;
+
+void scandir(const string& path);
+
+/* Ensure contents of metadata are flushed to an object. */
+void metadata_flush()
{
- return (int64_t)time * 1000000;
+ string m = metadata.str();
+ if (m.size() == 0)
+ return;
+
+ /* Write current metadata information to a new object. */
+ LbsObject *meta = new LbsObject;
+ meta->set_group("root");
+ meta->set_data(m.data(), m.size());
+ meta->write(tss);
+ meta->checksum();
+
+ /* Write a reference to this block in the root. */
+ ObjectReference ref = meta->get_ref();
+ metadata_root << "@" << ref.to_string() << "\n";
+ segment_list.insert(ref.get_segment());
+
+ delete meta;
+
+ metadata.str("");
}
/* Read data from a file descriptor and return the amount of data read. A
/* 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)
+void dumpfile(int fd, dictionary &file_info)
{
struct stat stat_buf;
fstat(fd, &stat_buf);
int64_t size = 0;
- list<string> segment_list;
+ list<string> object_list;
if ((stat_buf.st_mode & S_IFMT) != S_IFREG) {
- printf("file is no longer a regular file!\n");
+ fprintf(stderr, "file is no longer a regular file!\n");
return;
}
hash.process(block_buf, bytes);
// tarstore processing
- string blockid = tss->write_object(block_buf, bytes, "data");
- segment_list.push_back(blockid);
+ LbsObject *o = new LbsObject;
+ o->set_group("data");
+ o->set_data(block_buf, bytes);
+ o->write(tss);
+ object_list.push_back(o->get_name());
+ segment_list.insert(o->get_ref().get_segment());
+ delete o;
size += bytes;
}
/* 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) {
+ if (object_list.size() < 8) {
string blocklist = "";
- for (list<string>::iterator i = segment_list.begin();
- i != segment_list.end(); ++i) {
- if (i != segment_list.begin())
+ for (list<string>::iterator i = object_list.begin();
+ i != object_list.end(); ++i) {
+ if (i != object_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) {
+ for (list<string>::iterator i = object_list.begin();
+ i != object_list.end(); ++i) {
blocklist += *i + "\n";
}
- string indirect = tss->write_object(blocklist.data(), blocklist.size(),
- "indirect");
- file_info["data"] = "@" + indirect;
+
+ LbsObject *i = new LbsObject;
+ i->set_group("indirect");
+ i->set_data(blocklist.data(), blocklist.size());
+ i->write(tss);
+ file_info["data"] = "@" + i->get_name();
+ segment_list.insert(i->get_ref().get_segment());
+ delete i;
}
}
-void scanfile(const string& path, ostream &metadata)
+void scanfile(const string& path)
{
int fd;
long flags;
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");
+ fprintf(stderr, "error reading symlink: %m\n");
} else if (len <= stat_buf.st_size) {
buf[len] = '\0';
- printf(" contents=%s\n", buf);
+ file_info["contents"] = uri_encode(buf);
} else if (len > stat_buf.st_size) {
- printf("error reading symlink: name truncated\n");
+ fprintf(stderr, "error reading symlink: name truncated\n");
}
- file_info["contents"] = uri_encode(buf);
-
delete[] buf;
break;
case S_IFREG:
fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
file_info["size"] = encode_int(stat_buf.st_size);
- dumpfile(fd, file_info, metadata);
+ dumpfile(fd, file_info);
close(fd);
break;
}
file_info["type"] = string(1, inode_type);
- metadata << "type: " << inode_type << "\n";
dict_output(metadata, file_info);
metadata << "\n";
+ // Break apart metadata listing if it becomes too large.
+ if (metadata.str().size() > LBS_METADATA_BLOCK_SIZE)
+ metadata_flush();
+
// If we hit a directory, now that we've written the directory itself,
// recursively scan the directory.
if (recurse)
- scandir(path, metadata);
+ scandir(path);
}
-void scandir(const string& path, ostream &metadata)
+void scandir(const string& path)
{
DIR *dir = opendir(path.c_str());
if (dir == NULL) {
- printf("Error: %m\n");
+ fprintf(stderr, "Error: %m\n");
return;
}
for (vector<string>::iterator i = contents.begin();
i != contents.end(); ++i) {
const string& filename = *i;
- scanfile(path + "/" + filename, metadata);
+ scanfile(path + "/" + filename);
}
closedir(dir);
{
block_buf = new char[LBS_BLOCK_SIZE];
- tss = new TarSegmentStore(".");
+ string backup_dest = ".";
+
+ if (argc > 1)
+ backup_dest = argv[1];
- std::ostringstream metadata;
+ tss = new TarSegmentStore(backup_dest);
+
+ string desc_filename = backup_dest + "/snapshot.lbs";
+ std::ofstream descriptor(desc_filename.c_str());
try {
- scanfile(".", metadata);
+ scanfile(".");
} catch (IOException e) {
fprintf(stderr, "IOException: %s\n", e.getError().c_str());
}
- const string md = metadata.str();
- string root = tss->write_object(md.data(), md.size(), "root");
+ metadata_flush();
+ const string md = metadata_root.str();
+
+ LbsObject *root = new LbsObject;
+ root->set_group("root");
+ root->set_data(md.data(), md.size());
+ root->write(tss);
+ root->checksum();
+
+ segment_list.insert(root->get_ref().get_segment());
+ descriptor << "root: " << root->get_ref().to_string() << "\n\n";
+
+ delete root;
+
+ descriptor << "segments:\n";
+ for (std::set<string>::iterator i = segment_list.begin();
+ i != segment_list.end(); ++i) {
+ descriptor << " " << *i << "\n";
+ }
tss->sync();
delete tss;
projects / cumulus.git / blobdiff