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/** |
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* This file is part of the CernVM File System. |
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* |
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* Process a set of input files and create appropriate graft files. |
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*/ |
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#include "swissknife_graft.h" |
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| 9 |
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#include <fcntl.h> |
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#include <unistd.h> |
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| 12 |
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#include <cstdio> |
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#include <vector> |
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#include "crypto/hash.h" |
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#include "util/fs_traversal.h" |
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#include "util/posix.h" |
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| 19 |
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✗ |
bool swissknife::CommandGraft::ChecksumFdWithChunks( |
| 20 |
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int fd, zlib::Compressor *compressor, uint64_t *file_size, |
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shash::Any *file_hash, std::vector<uint64_t> *chunk_offsets, |
| 22 |
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std::vector<shash::Any> *chunk_checksums) { |
| 23 |
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✗ |
if (!compressor || !file_size || !file_hash) { |
| 24 |
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✗ |
return false; |
| 25 |
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} |
| 26 |
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✗ |
*file_size = 0; |
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✗ |
shash::Any chunk_hash(hash_alg_); |
| 28 |
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ssize_t bytes_read; |
| 29 |
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unsigned char in_buf[zlib::kZChunk]; |
| 30 |
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✗ |
unsigned char *cur_in_buf = in_buf; |
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✗ |
size_t in_buf_size = zlib::kZChunk; |
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unsigned char out_buf[zlib::kZChunk]; |
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✗ |
size_t avail_in = 0; |
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| 35 |
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// Initialize the file and per-chunk checksums |
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✗ |
shash::ContextPtr file_hash_context(hash_alg_); |
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file_hash_context.buffer = alloca(file_hash_context.size); |
| 38 |
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✗ |
shash::Init(file_hash_context); |
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| 40 |
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shash::ContextPtr chunk_hash_context(hash_alg_); |
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chunk_hash_context.buffer = alloca(chunk_hash_context.size); |
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✗ |
shash::Init(chunk_hash_context); |
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| 44 |
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const bool do_chunk = chunk_size_ > 0; |
| 45 |
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✗ |
if (do_chunk) { |
| 46 |
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✗ |
if (!chunk_offsets || !chunk_checksums) { |
| 47 |
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return false; |
| 48 |
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} |
| 49 |
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✗ |
chunk_offsets->push_back(0); |
| 50 |
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} |
| 51 |
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| 52 |
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✗ |
bool flush = 0; |
| 53 |
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do { |
| 54 |
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bytes_read = read(fd, cur_in_buf + avail_in, in_buf_size); |
| 55 |
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✗ |
if (-1 == bytes_read) { |
| 56 |
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✗ |
if (errno == EINTR) { |
| 57 |
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continue; |
| 58 |
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} |
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LogCvmfs(kLogCvmfs, kLogStderr, "Failure when reading file: %s", |
| 60 |
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strerror(errno)); |
| 61 |
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✗ |
return false; |
| 62 |
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} |
| 63 |
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✗ |
*file_size += bytes_read; |
| 64 |
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✗ |
avail_in += bytes_read; |
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| 66 |
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flush = (static_cast<size_t>(bytes_read) < in_buf_size); |
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| 68 |
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// If possible, make progress on deflate. |
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unsigned char *cur_out_buf = out_buf; |
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size_t avail_out = zlib::kZChunk; |
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compressor->Deflate(flush, &cur_in_buf, &avail_in, &cur_out_buf, |
| 72 |
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&avail_out); |
| 73 |
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✗ |
if (do_chunk) { |
| 74 |
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shash::Update(out_buf, avail_out, chunk_hash_context); |
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✗ |
if (generate_bulk_hash_) |
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✗ |
shash::Update(out_buf, avail_out, file_hash_context); |
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} else { |
| 78 |
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shash::Update(out_buf, avail_out, file_hash_context); |
| 79 |
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} |
| 80 |
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| 81 |
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✗ |
if (!avail_in) { |
| 82 |
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// All bytes are consumed; set the buffer back to the beginning. |
| 83 |
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cur_in_buf = in_buf; |
| 84 |
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in_buf_size = zlib::kZChunk; |
| 85 |
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} else { |
| 86 |
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in_buf_size = zlib::kZChunk - (cur_in_buf - in_buf) - avail_in; |
| 87 |
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} |
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// Start a new hash if current one is above threshold |
| 90 |
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✗ |
if (do_chunk && (*file_size - chunk_offsets->back() >= chunk_size_)) { |
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✗ |
shash::Final(chunk_hash_context, &chunk_hash); |
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✗ |
chunk_offsets->push_back(*file_size); |
| 93 |
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✗ |
chunk_checksums->push_back(chunk_hash); |
| 94 |
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✗ |
shash::Init(chunk_hash_context); |
| 95 |
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} |
| 96 |
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✗ |
} while (!flush); |
| 97 |
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| 98 |
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✗ |
shash::Final(file_hash_context, file_hash); |
| 99 |
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✗ |
if (do_chunk) { |
| 100 |
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✗ |
shash::Final(chunk_hash_context, &chunk_hash); |
| 101 |
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chunk_checksums->push_back(chunk_hash); |
| 102 |
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} |
| 103 |
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| 104 |
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// Zero-size chunks are not allowed; except if there is only one chunk |
| 105 |
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if (do_chunk && (chunk_offsets->back() == *file_size) |
| 106 |
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&& (chunk_offsets->size() > 1)) { |
| 107 |
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chunk_offsets->pop_back(); |
| 108 |
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chunk_checksums->pop_back(); |
| 109 |
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} |
| 110 |
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| 111 |
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✗ |
if (do_chunk && !generate_bulk_hash_) |
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file_hash->SetNull(); |
| 113 |
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| 114 |
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// Do not chunk a file if it is under threshold. |
| 115 |
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✗ |
if (do_chunk && (chunk_offsets->size() == 1)) { |
| 116 |
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*file_hash = (*chunk_checksums)[0]; |
| 117 |
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chunk_offsets->clear(); |
| 118 |
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chunk_checksums->clear(); |
| 119 |
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} |
| 120 |
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✗ |
return true; |
| 121 |
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} |
| 122 |
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| 123 |
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bool swissknife::CommandGraft::DirCallback(const std::string &relative_path, |
| 124 |
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const std::string &dir_name) { |
| 125 |
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✗ |
if (!output_file_.size()) { |
| 126 |
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return true; |
| 127 |
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} |
| 128 |
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const std::string full_output_path = output_file_ + "/" |
| 129 |
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+ (relative_path.size() ? relative_path |
| 130 |
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: ".") |
| 131 |
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+ "/" + dir_name; |
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const std::string full_input_path = input_file_ + "/" |
| 133 |
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+ (relative_path.size() ? relative_path |
| 134 |
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: ".") |
| 135 |
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+ "/" + dir_name; |
| 136 |
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platform_stat64 sbuf; |
| 137 |
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✗ |
if (-1 == platform_stat(full_input_path.c_str(), &sbuf)) { |
| 138 |
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return false; |
| 139 |
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} |
| 140 |
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return MkdirDeep(full_output_path, sbuf.st_mode); |
| 141 |
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} |
| 142 |
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| 143 |
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✗ |
void swissknife::CommandGraft::FileCallback(const std::string &relative_path, |
| 144 |
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const std::string &file_name) { |
| 145 |
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✗ |
const std::string full_input_path = input_file_ + "/" |
| 146 |
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+ (relative_path.size() ? relative_path |
| 147 |
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: ".") |
| 148 |
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✗ |
+ "/" + file_name; |
| 149 |
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✗ |
std::string full_output_path; |
| 150 |
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✗ |
if (output_file_.size()) { |
| 151 |
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full_output_path = output_file_ + "/" |
| 152 |
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+ (relative_path.size() ? relative_path : ".") + "/" |
| 153 |
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+ file_name; |
| 154 |
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} |
| 155 |
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Publish(full_input_path, full_output_path, false, false); |
| 156 |
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} |
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| 158 |
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✗ |
int swissknife::CommandGraft::Main(const swissknife::ArgumentList &args) { |
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const std::string &input_file = *args.find('i')->second; |
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const std::string output_file = (args.find('o') == args.end()) |
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? "" |
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: *(args.find('o')->second); |
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verbose_ = args.find('v') != args.end(); |
| 164 |
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generate_bulk_hash_ = args.find('b') != args.end(); |
| 165 |
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✗ |
hash_alg_ = (args.find('a') == args.end()) |
| 166 |
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✗ |
? shash::kSha1 |
| 167 |
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: shash::ParseHashAlgorithm(*args.find('a')->second); |
| 168 |
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compression_alg_ = (args.find('Z') == args.end()) |
| 169 |
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✗ |
? zlib::kNoCompression |
| 170 |
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✗ |
: zlib::ParseCompressionAlgorithm( |
| 171 |
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*args.find('Z')->second); |
| 172 |
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| 173 |
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if (args.find('c') == args.end()) { |
| 174 |
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chunk_size_ = kDefaultChunkSize; |
| 175 |
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} else { |
| 176 |
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const std::string chunk_size = *args.find('c')->second; |
| 177 |
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✗ |
if (!String2Uint64Parse(chunk_size, &chunk_size_)) { |
| 178 |
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LogCvmfs(kLogCvmfs, kLogStderr, "Unable to parse chunk size: %s", |
| 179 |
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chunk_size.c_str()); |
| 180 |
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✗ |
return 1; |
| 181 |
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} |
| 182 |
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} |
| 183 |
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✗ |
chunk_size_ *= 1024 * 1024; // Convert to MB. |
| 184 |
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| 185 |
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platform_stat64 sbuf; |
| 186 |
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✗ |
const bool output_file_is_dir = output_file.size() |
| 187 |
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✗ |
&& (0 |
| 188 |
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✗ |
== platform_stat(output_file.c_str(), |
| 189 |
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&sbuf)) |
| 190 |
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✗ |
&& S_ISDIR(sbuf.st_mode); |
| 191 |
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✗ |
if (output_file_is_dir && (input_file == "-")) { |
| 192 |
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✗ |
LogCvmfs(kLogCvmfs, kLogStderr, "Output file (%s): Is a directory\n", |
| 193 |
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output_file.c_str()); |
| 194 |
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✗ |
return 1; |
| 195 |
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} |
| 196 |
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| 197 |
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✗ |
if (input_file != "-") { |
| 198 |
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const bool input_file_is_dir = (0 |
| 199 |
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✗ |
== platform_stat(input_file.c_str(), &sbuf)) |
| 200 |
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✗ |
&& S_ISDIR(sbuf.st_mode); |
| 201 |
|
✗ |
if (input_file_is_dir) { |
| 202 |
|
✗ |
if (!output_file_is_dir && output_file.size()) { |
| 203 |
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✗ |
LogCvmfs(kLogCvmfs, kLogStderr, |
| 204 |
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"Input (%s) is a directory but output" |
| 205 |
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" (%s) is not\n", |
| 206 |
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input_file.c_str(), output_file.c_str()); |
| 207 |
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✗ |
return 1; |
| 208 |
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} |
| 209 |
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✗ |
if (verbose_) { |
| 210 |
|
✗ |
LogCvmfs(kLogCvmfs, kLogStderr, "Recursing into directory %s\n", |
| 211 |
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input_file.c_str()); |
| 212 |
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} |
| 213 |
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✗ |
return Recurse(input_file, output_file); |
| 214 |
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} else { |
| 215 |
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✗ |
return Publish(input_file, output_file, output_file_is_dir, false); |
| 216 |
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} |
| 217 |
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} |
| 218 |
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✗ |
return Publish(input_file, output_file, output_file_is_dir, true); |
| 219 |
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} |
| 220 |
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| 221 |
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✗ |
int swissknife::CommandGraft::Publish(const std::string &input_file, |
| 222 |
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const std::string &output_file, |
| 223 |
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bool output_file_is_dir, |
| 224 |
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bool input_file_is_stdin) { |
| 225 |
|
✗ |
if (output_file.size() && verbose_) { |
| 226 |
|
✗ |
LogCvmfs(kLogCvmfs, kLogStdout, "Grafting %s to %s", input_file.c_str(), |
| 227 |
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output_file.c_str()); |
| 228 |
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✗ |
} else if (!output_file.size()) { |
| 229 |
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✗ |
LogCvmfs(kLogCvmfs, kLogStdout, "Grafting %s", input_file.c_str()); |
| 230 |
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} |
| 231 |
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int fd; |
| 232 |
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✗ |
if (input_file_is_stdin) { |
| 233 |
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✗ |
fd = 0; |
| 234 |
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} else { |
| 235 |
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✗ |
fd = open(input_file.c_str(), O_RDONLY); |
| 236 |
|
✗ |
if (fd < 0) { |
| 237 |
|
✗ |
const std::string errmsg = "Unable to open input file (" + input_file |
| 238 |
|
✗ |
+ ")"; |
| 239 |
|
✗ |
perror(errmsg.c_str()); |
| 240 |
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✗ |
return 1; |
| 241 |
|
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} |
| 242 |
|
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} |
| 243 |
|
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|
| 244 |
|
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// Get input file mode; output file will be set identically. |
| 245 |
|
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platform_stat64 sbuf; |
| 246 |
|
✗ |
if (-1 == platform_fstat(fd, &sbuf)) { |
| 247 |
|
✗ |
const std::string errmsg = "Unable to stat input file (" + input_file + ")"; |
| 248 |
|
✗ |
perror(errmsg.c_str()); |
| 249 |
|
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} |
| 250 |
|
✗ |
const mode_t input_file_mode = input_file_is_stdin ? 0644 : sbuf.st_mode; |
| 251 |
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|
| 252 |
|
✗ |
shash::Any file_hash(hash_alg_); |
| 253 |
|
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uint64_t processed_size; |
| 254 |
|
✗ |
std::vector<uint64_t> chunk_offsets; |
| 255 |
|
✗ |
std::vector<shash::Any> chunk_checksums; |
| 256 |
|
✗ |
zlib::Compressor *compressor = zlib::Compressor::Construct(compression_alg_); |
| 257 |
|
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|
| 258 |
|
✗ |
bool retval = ChecksumFdWithChunks(fd, compressor, &processed_size, |
| 259 |
|
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&file_hash, &chunk_offsets, |
| 260 |
|
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&chunk_checksums); |
| 261 |
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|
| 262 |
|
✗ |
if (!input_file_is_stdin) { |
| 263 |
|
✗ |
close(fd); |
| 264 |
|
|
} |
| 265 |
|
✗ |
if (!retval) { |
| 266 |
|
✗ |
const std::string errmsg = "Unable to checksum input file (" + input_file |
| 267 |
|
✗ |
+ ")"; |
| 268 |
|
✗ |
perror(errmsg.c_str()); |
| 269 |
|
✗ |
return 1; |
| 270 |
|
|
} |
| 271 |
|
|
|
| 272 |
|
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// Build the .cvmfsgraft-$filename |
| 273 |
|
✗ |
if (output_file.size()) { |
| 274 |
|
✗ |
std::string dirname, fname; |
| 275 |
|
✗ |
std::string graft_fname; |
| 276 |
|
✗ |
if (output_file_is_dir) { |
| 277 |
|
✗ |
SplitPath(input_file, &dirname, &fname); |
| 278 |
|
✗ |
graft_fname = output_file + "/.cvmfsgraft-" + fname; |
| 279 |
|
|
} else { |
| 280 |
|
✗ |
SplitPath(output_file, &dirname, &fname); |
| 281 |
|
✗ |
graft_fname = dirname + "/.cvmfsgraft-" + fname; |
| 282 |
|
|
} |
| 283 |
|
✗ |
fd = open(graft_fname.c_str(), O_CREAT | O_TRUNC | O_WRONLY, 0644); |
| 284 |
|
✗ |
if (fd < 0) { |
| 285 |
|
✗ |
const std::string errmsg = "Unable to open graft file (" + graft_fname |
| 286 |
|
✗ |
+ ")"; |
| 287 |
|
✗ |
perror(errmsg.c_str()); |
| 288 |
|
✗ |
return 1; |
| 289 |
|
|
} |
| 290 |
|
✗ |
} else { |
| 291 |
|
✗ |
fd = 1; |
| 292 |
|
|
} |
| 293 |
|
✗ |
const bool with_suffix = true; |
| 294 |
|
✗ |
std::string graft_contents = "size=" + StringifyInt(processed_size) + "\n" |
| 295 |
|
✗ |
+ "checksum=" + file_hash.ToString(with_suffix) |
| 296 |
|
✗ |
+ "\n" + "compression=" |
| 297 |
|
✗ |
+ zlib::AlgorithmName(compression_alg_) + "\n"; |
| 298 |
|
✗ |
if (!chunk_offsets.empty()) { |
| 299 |
|
✗ |
std::vector<std::string> chunk_off_str; |
| 300 |
|
✗ |
chunk_off_str.reserve(chunk_offsets.size()); |
| 301 |
|
✗ |
std::vector<std::string> chunk_ck_str; |
| 302 |
|
✗ |
chunk_ck_str.reserve(chunk_offsets.size()); |
| 303 |
|
✗ |
for (unsigned idx = 0; idx < chunk_offsets.size(); idx++) { |
| 304 |
|
✗ |
chunk_off_str.push_back(StringifyInt(chunk_offsets[idx])); |
| 305 |
|
✗ |
chunk_ck_str.push_back(chunk_checksums[idx].ToStringWithSuffix()); |
| 306 |
|
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} |
| 307 |
|
✗ |
graft_contents += "chunk_offsets=" + JoinStrings(chunk_off_str, ",") + "\n"; |
| 308 |
|
✗ |
graft_contents += "chunk_checksums=" + JoinStrings(chunk_ck_str, ",") |
| 309 |
|
✗ |
+ "\n"; |
| 310 |
|
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} |
| 311 |
|
✗ |
const size_t nbytes = graft_contents.size(); |
| 312 |
|
✗ |
const char *buf = graft_contents.c_str(); |
| 313 |
|
✗ |
retval = SafeWrite(fd, buf, nbytes); |
| 314 |
|
✗ |
if (!retval) { |
| 315 |
|
✗ |
perror("Failed writing to graft file"); |
| 316 |
|
✗ |
close(fd); |
| 317 |
|
✗ |
return 1; |
| 318 |
|
|
} |
| 319 |
|
✗ |
if (output_file.size()) { |
| 320 |
|
✗ |
close(fd); |
| 321 |
|
|
} else { |
| 322 |
|
✗ |
return 0; |
| 323 |
|
|
} |
| 324 |
|
|
|
| 325 |
|
|
// Create and truncate the output file. |
| 326 |
|
✗ |
std::string output_fname; |
| 327 |
|
✗ |
if (output_file_is_dir) { |
| 328 |
|
✗ |
output_fname = output_file + "/" + GetFileName(input_file); |
| 329 |
|
|
} else { |
| 330 |
|
✗ |
output_fname = output_file; |
| 331 |
|
|
} |
| 332 |
|
✗ |
fd = open(output_fname.c_str(), O_CREAT | O_TRUNC | O_WRONLY, |
| 333 |
|
|
input_file_mode); |
| 334 |
|
✗ |
if (fd < 0) { |
| 335 |
|
✗ |
const std::string errmsg = "Unable to open output file (" + output_file |
| 336 |
|
✗ |
+ ")"; |
| 337 |
|
✗ |
perror(errmsg.c_str()); |
| 338 |
|
✗ |
return 1; |
| 339 |
|
|
} |
| 340 |
|
✗ |
close(fd); |
| 341 |
|
|
|
| 342 |
|
✗ |
return 0; |
| 343 |
|
|
} |
| 344 |
|
|
|
| 345 |
|
✗ |
int swissknife::CommandGraft::Recurse(const std::string &input_file, |
| 346 |
|
|
const std::string &output_file) { |
| 347 |
|
✗ |
output_file_ = output_file; |
| 348 |
|
✗ |
input_file_ = input_file; |
| 349 |
|
|
|
| 350 |
|
✗ |
FileSystemTraversal<CommandGraft> traverser(this, input_file, true); |
| 351 |
|
✗ |
traverser.fn_new_file = &CommandGraft::FileCallback; |
| 352 |
|
✗ |
traverser.fn_new_dir_prefix = &CommandGraft::DirCallback; |
| 353 |
|
✗ |
traverser.Recurse(input_file); |
| 354 |
|
✗ |
return 0; |
| 355 |
|
|
} |
| 356 |
|
|
|