#include <string>
#include <vector>
+#include "store.h"
+#include "sha1.h"
+
using std::string;
using std::vector;
+static SegmentStore *segment_store;
+static OutputStream *info_dump = NULL;
+
+static SegmentPartitioner *index_segment, *data_segment;
+
+/* 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);
-void dumpfile(int fd)
+/* 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;
+ }
+ }
+
+ 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)
{
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;
}
+ /* 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. */
+ struct uuid segment_uuid;
+ int object_id;
+ OutputStream *index_data = index_segment->new_object(&segment_uuid,
+ &object_id);
+
+ 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) {
+ struct uuid block_segment_uuid;
+ int block_object_id;
+
+ size_t bytes = file_read(fd, block_buf, LBS_BLOCK_SIZE);
+ if (bytes == 0)
break;
- } else {
- size += res;
- }
+
+ hash.process(block_buf, bytes);
+ OutputStream *block = data_segment->new_object(&block_segment_uuid,
+ &block_object_id);
+ block->write(block_buf, bytes);
+ index_data->write_uuid(block_segment_uuid);
+ index_data->write_u32(block_object_id);
+
+ size += bytes;
}
- printf(" bytes=%Ld\n", size);
+ file_info["sha1"] = string((const char *)hash.checksum(),
+ hash.checksum_size());
+ file_info["data"] = encode_objref(segment_uuid, object_id);
}
void scanfile(const string& path)
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:
- printf(" special file\n");
+ inode_type = 'b';
break;
case S_IFLNK:
- printf(" symlink\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
} 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
flags = fcntl(fd, F_GETFL);
fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
- dumpfile(fd);
+ 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)
int main(int argc, char *argv[])
{
- scandir(".");
+ block_buf = new char[LBS_BLOCK_SIZE];
+
+ segment_store = new SegmentStore(".");
+ SegmentWriter *sw = segment_store->new_segment();
+ info_dump = sw->new_object(NULL);
+
+ index_segment = new SegmentPartitioner(segment_store);
+ data_segment = new SegmentPartitioner(segment_store);
+
+ string uuid = SegmentWriter::format_uuid(sw->get_uuid());
+ printf("Backup UUID: %s\n", uuid.c_str());
+
+ try {
+ scanfile(".");
+ } catch (IOException e) {
+ fprintf(stderr, "IOException: %s\n", e.getError().c_str());
+ }
+
+ delete index_segment;
+ delete data_segment;
+ delete sw;
return 0;
}
projects / cumulus.git / blobdiff