/* Recursively descend the filesystem and visit each file. */
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdint.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
-#include <pwd.h>
+#include <getopt.h>
#include <grp.h>
-#include <sys/types.h>
+#include <pwd.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
#include <sys/stat.h>
+#include <sys/types.h>
#include <unistd.h>
#include <algorithm>
-#include <string>
-#include <list>
-#include <vector>
-#include <iostream>
#include <fstream>
-#include <sstream>
+#include <iostream>
+#include <list>
#include <set>
+#include <sstream>
+#include <string>
+#include <vector>
#include "format.h"
+#include "localdb.h"
#include "store.h"
#include "sha1.h"
static const size_t LBS_METADATA_BLOCK_SIZE = 65536;
+/* Local database, which tracks objects written in this and previous
+ * invocations to help in creating incremental snapshots. */
+LocalDb *db;
+
/* Contents of the root object. This will contain a set of indirect links to
* the metadata objects. */
std::ostringstream metadata_root;
void scandir(const string& path);
+/* Selection of files to include/exclude in the snapshot. */
+std::list<string> excludes;
+
/* Ensure contents of metadata are flushed to an object. */
void metadata_flush()
{
hash.process(block_buf, bytes);
- // tarstore processing
- 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;
+ // Either find a copy of this block in an already-existing segment, or
+ // index it so it can be re-used in the future
+ SHA1Checksum block_hash;
+ block_hash.process(block_buf, bytes);
+ string block_csum = block_hash.checksum_str();
+ ObjectReference ref = db->FindObject(block_csum, bytes);
+
+ // Store a copy of the object if one does not yet exist
+ if (ref.get_segment().size() == 0) {
+ LbsObject *o = new LbsObject;
+ o->set_group("data");
+ o->set_data(block_buf, bytes);
+ o->write(tss);
+ ref = o->get_ref();
+ db->StoreObject(ref, block_csum, bytes);
+ delete o;
+ }
+ object_list.push_back(ref.to_string());
+ segment_list.insert(ref.get_segment());
+ db->UseObject(ref);
size += bytes;
}
// Set to true if the item is a directory and we should recursively scan
bool recurse = false;
+ // Check this file against the include/exclude list to see if it should be
+ // considered
+ for (list<string>::iterator i = excludes.begin();
+ i != excludes.end(); ++i) {
+ if (path == *i) {
+ printf("Excluding %s\n", path.c_str());
+ return;
+ }
+ }
+
dictionary file_info;
lstat(path.c_str(), &stat_buf);
for (vector<string>::iterator i = contents.begin();
i != contents.end(); ++i) {
const string& filename = *i;
- scanfile(path + "/" + filename);
+ if (path == ".")
+ scanfile(filename);
+ else
+ scanfile(path + "/" + filename);
}
closedir(dir);
}
-int main(int argc, char *argv[])
+void usage(const char *program)
{
- block_buf = new char[LBS_BLOCK_SIZE];
+ fprintf(stderr,
+ "Usage: %s [OPTION]... SOURCE DEST\n"
+ "Produce backup snapshot of files in SOURCE and store to DEST.\n"
+ "\n"
+ "Options:\n"
+ " --exclude=PATH exclude files in PATH from snapshot\n"
+ " --localdb=PATH local backup metadata is stored in PATH\n",
+ program);
+}
+int main(int argc, char *argv[])
+{
+ string backup_source = ".";
string backup_dest = ".";
+ string localdb_dir = "";
+
+ while (1) {
+ static struct option long_options[] = {
+ {"localdb", 1, 0, 0}, // 0
+ {"exclude", 1, 0, 0}, // 1
+ {NULL, 0, 0, 0},
+ };
+
+ int long_index;
+ int c = getopt_long(argc, argv, "", long_options, &long_index);
- if (argc > 1)
- backup_dest = argv[1];
+ if (c == -1)
+ break;
+
+ if (c == 0) {
+ switch (long_index) {
+ case 0: // --localdb
+ localdb_dir = optarg;
+ break;
+ case 1: // --exclude
+ excludes.push_back(optarg);
+ break;
+ default:
+ fprintf(stderr, "Unhandled long option!\n");
+ return 1;
+ }
+ } else {
+ usage(argv[0]);
+ return 1;
+ }
+ }
+
+ if (argc < optind + 2) {
+ usage(argv[0]);
+ return 1;
+ }
+
+ backup_source = argv[optind];
+ backup_dest = argv[argc - 1];
+
+ if (localdb_dir == "") {
+ localdb_dir = backup_dest;
+ }
+
+ printf("Source: %s, Dest: %s\n",
+ backup_source.c_str(), backup_dest.c_str());
tss = new TarSegmentStore(backup_dest);
+ block_buf = new char[LBS_BLOCK_SIZE];
/* Write a backup descriptor file, which says which segments are needed and
* where to start to restore this snapshot. The filename is based on the
string desc_filename = backup_dest + "/" + desc_buf + ".lbs";
std::ofstream descriptor(desc_filename.c_str());
+ /* Open the local database which tracks all objects that are stored
+ * remotely, for efficient incrementals. Provide it with the name of this
+ * snapshot. */
+ string database_path = backup_dest + "/localdb.sqlite";
+ db = new LocalDb;
+ db->Open(database_path.c_str(), desc_buf);
+
try {
scanfile(".");
} catch (IOException e) {
descriptor << " " << *i << "\n";
}
+ db->Close();
+
tss->sync();
delete tss;
projects / cumulus.git / blobdiff