diff options
Diffstat (limited to 'libs/utils/backup_helper_file.cpp')
| -rw-r--r-- | libs/utils/backup_helper_file.cpp | 826 |
1 files changed, 826 insertions, 0 deletions
diff --git a/libs/utils/backup_helper_file.cpp b/libs/utils/backup_helper_file.cpp new file mode 100644 index 0000000..1fa6a0f --- /dev/null +++ b/libs/utils/backup_helper_file.cpp @@ -0,0 +1,826 @@ +/* + * Copyright (C) 2009 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#define LOG_TAG "file_backup_helper" + +#include <utils/backup_helpers.h> + +#include <utils/KeyedVector.h> +#include <utils/ByteOrder.h> +#include <utils/String8.h> + +#include <errno.h> +#include <sys/types.h> +#include <sys/uio.h> +#include <sys/stat.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <utime.h> +#include <fcntl.h> +#include <zlib.h> + +#include <cutils/log.h> + +namespace android { + +#define MAGIC0 0x70616e53 // Snap +#define MAGIC1 0x656c6946 // File + +#if TEST_BACKUP_HELPERS +#define LOGP(x...) printf(x) +#else +#define LOGP(x...) LOGD(x) +#endif + +struct SnapshotHeader { + int magic0; + int fileCount; + int magic1; + int totalSize; +}; + +struct FileState { + int modTime_sec; + int modTime_nsec; + int size; + int crc32; + int nameLen; +}; + +const static int ROUND_UP[4] = { 0, 3, 2, 1 }; + +static inline int +round_up(int n) +{ + return n + ROUND_UP[n % 4]; +} + +static int +read_snapshot_file(int fd, KeyedVector<String8,FileState>* snapshot) +{ + int bytesRead = 0; + int amt; + SnapshotHeader header; + + amt = read(fd, &header, sizeof(header)); + if (amt != sizeof(header)) { + return errno; + } + bytesRead += amt; + + if (header.magic0 != MAGIC0 || header.magic1 != MAGIC1) { + LOGW("read_snapshot_file header.magic0=0x%08x magic1=0x%08x", header.magic0, header.magic1); + return 1; + } + + for (int i=0; i<header.fileCount; i++) { + FileState file; + char filenameBuf[128]; + + amt = read(fd, &file, sizeof(file)); + if (amt != sizeof(file)) { + LOGW("read_snapshot_file FileState truncated/error with read at %d bytes\n", bytesRead); + return 1; + } + bytesRead += amt; + + // filename is not NULL terminated, but it is padded + int nameBufSize = round_up(file.nameLen); + char* filename = nameBufSize <= (int)sizeof(filenameBuf) + ? filenameBuf + : (char*)malloc(nameBufSize); + amt = read(fd, filename, nameBufSize); + if (amt == nameBufSize) { + snapshot->add(String8(filename, file.nameLen), file); + } + bytesRead += amt; + if (filename != filenameBuf) { + free(filename); + } + if (amt != nameBufSize) { + LOGW("read_snapshot_file filename truncated/error with read at %d bytes\n", bytesRead); + return 1; + } + } + + if (header.totalSize != bytesRead) { + LOGW("read_snapshot_file length mismatch: header.totalSize=%d bytesRead=%d\n", + header.totalSize, bytesRead); + return 1; + } + + return 0; +} + +static int +write_snapshot_file(int fd, const KeyedVector<String8,FileState>& snapshot) +{ + int bytesWritten = sizeof(SnapshotHeader); + // preflight size + const int N = snapshot.size(); + for (int i=0; i<N; i++) { + const String8& name = snapshot.keyAt(i); + bytesWritten += sizeof(FileState) + round_up(name.length()); + } + + LOGP("write_snapshot_file fd=%d\n", fd); + + int amt; + SnapshotHeader header = { MAGIC0, N, MAGIC1, bytesWritten }; + + amt = write(fd, &header, sizeof(header)); + if (amt != sizeof(header)) { + LOGW("write_snapshot_file error writing header %s", strerror(errno)); + return errno; + } + + for (int i=0; i<header.fileCount; i++) { + const String8& name = snapshot.keyAt(i); + FileState file = snapshot.valueAt(i); + int nameLen = file.nameLen = name.length(); + + amt = write(fd, &file, sizeof(file)); + if (amt != sizeof(file)) { + LOGW("write_snapshot_file error writing header %s", strerror(errno)); + return 1; + } + + // filename is not NULL terminated, but it is padded + amt = write(fd, name.string(), nameLen); + if (amt != nameLen) { + LOGW("write_snapshot_file error writing filename %s", strerror(errno)); + return 1; + } + int paddingLen = ROUND_UP[nameLen % 4]; + if (paddingLen != 0) { + int padding = 0xabababab; + amt = write(fd, &padding, paddingLen); + if (amt != paddingLen) { + LOGW("write_snapshot_file error writing %d bytes of filename padding %s", + paddingLen, strerror(errno)); + return 1; + } + } + } + + return 0; +} + +static int +write_delete_file(const String8& key) +{ + LOGP("write_delete_file %s\n", key.string()); + return 0; +} + +static int +write_update_file(const String8& realFilename, const String8& key) +{ + LOGP("write_update_file %s (%s)\n", realFilename.string(), key.string()); + return 0; +} + +static int +compute_crc32(const String8& filename) +{ + const int bufsize = 4*1024; + int amt; + + int fd = open(filename.string(), O_RDONLY); + if (fd == -1) { + return -1; + } + + char* buf = (char*)malloc(bufsize); + int crc = crc32(0L, Z_NULL, 0); + + while ((amt = read(fd, buf, bufsize)) != 0) { + crc = crc32(crc, (Bytef*)buf, amt); + } + + close(fd); + free(buf); + + return crc; +} + +int +back_up_files(int oldSnapshotFD, int oldDataStream, int newSnapshotFD, + char const* fileBase, char const* const* files, int fileCount) +{ + int err; + const String8 base(fileBase); + KeyedVector<String8,FileState> oldSnapshot; + KeyedVector<String8,FileState> newSnapshot; + + if (oldSnapshotFD != -1) { + err = read_snapshot_file(oldSnapshotFD, &oldSnapshot); + if (err != 0) { + // On an error, treat this as a full backup. + oldSnapshot.clear(); + } + } + + for (int i=0; i<fileCount; i++) { + String8 name(files[i]); + FileState s; + struct stat st; + String8 realFilename(base); + realFilename.appendPath(name); + + err = stat(realFilename.string(), &st); + if (err != 0) { + LOGW("Error stating file %s", realFilename.string()); + continue; + } + + s.modTime_sec = st.st_mtime; + s.modTime_nsec = 0; // workaround sim breakage + //s.modTime_nsec = st.st_mtime_nsec; + s.size = st.st_size; + s.crc32 = compute_crc32(realFilename); + + newSnapshot.add(name, s); + } + + int n = 0; + int N = oldSnapshot.size(); + int m = 0; + + while (n<N && m<fileCount) { + const String8& p = oldSnapshot.keyAt(n); + const String8& q = newSnapshot.keyAt(m); + int cmp = p.compare(q); + if (cmp > 0) { + // file added + String8 realFilename(base); + realFilename.appendPath(q); + LOGP("file added: %s\n", realFilename.string()); + write_update_file(realFilename, q); + m++; + } + else if (cmp < 0) { + // file removed + LOGP("file removed: %s\n", p.string()); + write_delete_file(p); + n++; + } + else { + // both files exist, check them + String8 realFilename(base); + realFilename.appendPath(q); + const FileState& f = oldSnapshot.valueAt(n); + const FileState& g = newSnapshot.valueAt(m); + + LOGP("%s\n", q.string()); + LOGP(" new: modTime=%d,%d size=%-3d crc32=0x%08x\n", + f.modTime_sec, f.modTime_nsec, f.size, f.crc32); + LOGP(" old: modTime=%d,%d size=%-3d crc32=0x%08x\n", + g.modTime_sec, g.modTime_nsec, g.size, g.crc32); + if (f.modTime_sec != g.modTime_sec || f.modTime_nsec != g.modTime_nsec + || f.size != g.size || f.crc32 != g.crc32) { + write_update_file(realFilename, p); + } + n++; + m++; + } + } + + // these were deleted + while (n<N) { + write_delete_file(oldSnapshot.keyAt(n)); + n++; + } + + // these were added + while (m<fileCount) { + const String8& q = newSnapshot.keyAt(m); + String8 realFilename(base); + realFilename.appendPath(q); + write_update_file(realFilename, q); + m++; + } + + err = write_snapshot_file(newSnapshotFD, newSnapshot); + + return 0; +} + +#if TEST_BACKUP_HELPERS + +#define SCRATCH_DIR "/data/backup_helper_test/" + +static int +write_text_file(const char* path, const char* data) +{ + int amt; + int fd; + int len; + + fd = creat(path, 0666); + if (fd == -1) { + fprintf(stderr, "creat %s failed\n", path); + return errno; + } + + len = strlen(data); + amt = write(fd, data, len); + if (amt != len) { + fprintf(stderr, "error (%s) writing to file %s\n", strerror(errno), path); + return errno; + } + + close(fd); + + return 0; +} + +static int +compare_file(const char* path, const unsigned char* data, int len) +{ + int fd; + int amt; + + fd = open(path, O_RDONLY); + if (fd == -1) { + fprintf(stderr, "compare_file error (%s) opening %s\n", strerror(errno), path); + return errno; + } + + unsigned char* contents = (unsigned char*)malloc(len); + if (contents == NULL) { + fprintf(stderr, "malloc(%d) failed\n", len); + return ENOMEM; + } + + bool sizesMatch = true; + amt = lseek(fd, 0, SEEK_END); + if (amt != len) { + fprintf(stderr, "compare_file file length should be %d, was %d\n", len, amt); + sizesMatch = false; + } + lseek(fd, 0, SEEK_SET); + + int readLen = amt < len ? amt : len; + amt = read(fd, contents, readLen); + if (amt != readLen) { + fprintf(stderr, "compare_file read expected %d bytes but got %d\n", len, amt); + } + + bool contentsMatch = true; + for (int i=0; i<readLen; i++) { + if (data[i] != contents[i]) { + if (contentsMatch) { + fprintf(stderr, "compare_file contents are different: (index, expected, actual)\n"); + contentsMatch = false; + } + fprintf(stderr, " [%-2d] %02x %02x\n", i, data[i], contents[i]); + } + } + + return contentsMatch && sizesMatch ? 0 : 1; +} + +int +backup_helper_test_empty() +{ + int err; + int fd; + KeyedVector<String8,FileState> snapshot; + const char* filename = SCRATCH_DIR "backup_helper_test_empty.snap"; + + system("rm -r " SCRATCH_DIR); + mkdir(SCRATCH_DIR, 0777); + + // write + fd = creat(filename, 0666); + if (fd == -1) { + fprintf(stderr, "error creating %s\n", filename); + return 1; + } + + err = write_snapshot_file(fd, snapshot); + + close(fd); + + if (err != 0) { + fprintf(stderr, "write_snapshot_file reported error %d (%s)\n", err, strerror(err)); + return err; + } + + static const unsigned char correct_data[] = { + 0x53, 0x6e, 0x61, 0x70, 0x00, 0x00, 0x00, 0x00, + 0x46, 0x69, 0x6c, 0x65, 0x10, 0x00, 0x00, 0x00 + }; + + err = compare_file(filename, correct_data, sizeof(correct_data)); + if (err != 0) { + return err; + } + + // read + fd = open(filename, O_RDONLY); + if (fd == -1) { + fprintf(stderr, "error opening for read %s\n", filename); + return 1; + } + + KeyedVector<String8,FileState> readSnapshot; + err = read_snapshot_file(fd, &readSnapshot); + if (err != 0) { + fprintf(stderr, "read_snapshot_file failed %d\n", err); + return err; + } + + if (readSnapshot.size() != 0) { + fprintf(stderr, "readSnapshot should be length 0\n"); + return 1; + } + + return 0; +} + +int +backup_helper_test_four() +{ + int err; + int fd; + KeyedVector<String8,FileState> snapshot; + const char* filename = SCRATCH_DIR "backup_helper_test_four.snap"; + + system("rm -r " SCRATCH_DIR); + mkdir(SCRATCH_DIR, 0777); + + // write + fd = creat(filename, 0666); + if (fd == -1) { + fprintf(stderr, "error opening %s\n", filename); + return 1; + } + + String8 filenames[4]; + FileState states[4]; + + states[0].modTime_sec = 0xfedcba98; + states[0].modTime_nsec = 0xdeadbeef; + states[0].size = 0xababbcbc; + states[0].crc32 = 0x12345678; + states[0].nameLen = -12; + filenames[0] = String8("bytes_of_padding"); + snapshot.add(filenames[0], states[0]); + + states[1].modTime_sec = 0x93400031; + states[1].modTime_nsec = 0xdeadbeef; + states[1].size = 0x88557766; + states[1].crc32 = 0x22334422; + states[1].nameLen = -1; + filenames[1] = String8("bytes_of_padding3"); + snapshot.add(filenames[1], states[1]); + + states[2].modTime_sec = 0x33221144; + states[2].modTime_nsec = 0xdeadbeef; + states[2].size = 0x11223344; + states[2].crc32 = 0x01122334; + states[2].nameLen = 0; + filenames[2] = String8("bytes_of_padding_2"); + snapshot.add(filenames[2], states[2]); + + states[3].modTime_sec = 0x33221144; + states[3].modTime_nsec = 0xdeadbeef; + states[3].size = 0x11223344; + states[3].crc32 = 0x01122334; + states[3].nameLen = 0; + filenames[3] = String8("bytes_of_padding__1"); + snapshot.add(filenames[3], states[3]); + + err = write_snapshot_file(fd, snapshot); + + close(fd); + + if (err != 0) { + fprintf(stderr, "write_snapshot_file reported error %d (%s)\n", err, strerror(err)); + return err; + } + + static const unsigned char correct_data[] = { + // header + 0x53, 0x6e, 0x61, 0x70, 0x04, 0x00, 0x00, 0x00, + 0x46, 0x69, 0x6c, 0x65, 0xac, 0x00, 0x00, 0x00, + + // bytes_of_padding + 0x98, 0xba, 0xdc, 0xfe, 0xef, 0xbe, 0xad, 0xde, + 0xbc, 0xbc, 0xab, 0xab, 0x78, 0x56, 0x34, 0x12, + 0x10, 0x00, 0x00, 0x00, 0x62, 0x79, 0x74, 0x65, + 0x73, 0x5f, 0x6f, 0x66, 0x5f, 0x70, 0x61, 0x64, + 0x64, 0x69, 0x6e, 0x67, + + // bytes_of_padding3 + 0x31, 0x00, 0x40, 0x93, 0xef, 0xbe, 0xad, 0xde, + 0x66, 0x77, 0x55, 0x88, 0x22, 0x44, 0x33, 0x22, + 0x11, 0x00, 0x00, 0x00, 0x62, 0x79, 0x74, 0x65, + 0x73, 0x5f, 0x6f, 0x66, 0x5f, 0x70, 0x61, 0x64, + 0x64, 0x69, 0x6e, 0x67, 0x33, 0xab, 0xab, 0xab, + + // bytes of padding2 + 0x44, 0x11, 0x22, 0x33, 0xef, 0xbe, 0xad, 0xde, + 0x44, 0x33, 0x22, 0x11, 0x34, 0x23, 0x12, 0x01, + 0x12, 0x00, 0x00, 0x00, 0x62, 0x79, 0x74, 0x65, + 0x73, 0x5f, 0x6f, 0x66, 0x5f, 0x70, 0x61, 0x64, + 0x64, 0x69, 0x6e, 0x67, 0x5f, 0x32, 0xab, 0xab, + + // bytes of padding3 + 0x44, 0x11, 0x22, 0x33, 0xef, 0xbe, 0xad, 0xde, + 0x44, 0x33, 0x22, 0x11, 0x34, 0x23, 0x12, 0x01, + 0x13, 0x00, 0x00, 0x00, 0x62, 0x79, 0x74, 0x65, + 0x73, 0x5f, 0x6f, 0x66, 0x5f, 0x70, 0x61, 0x64, + 0x64, 0x69, 0x6e, 0x67, 0x5f, 0x5f, 0x31, 0xab + }; + + err = compare_file(filename, correct_data, sizeof(correct_data)); + if (err != 0) { + return err; + } + + // read + fd = open(filename, O_RDONLY); + if (fd == -1) { + fprintf(stderr, "error opening for read %s\n", filename); + return 1; + } + + + KeyedVector<String8,FileState> readSnapshot; + err = read_snapshot_file(fd, &readSnapshot); + if (err != 0) { + fprintf(stderr, "read_snapshot_file failed %d\n", err); + return err; + } + + if (readSnapshot.size() != 4) { + fprintf(stderr, "readSnapshot should be length 4 is %d\n", readSnapshot.size()); + return 1; + } + + bool matched = true; + for (size_t i=0; i<readSnapshot.size(); i++) { + const String8& name = readSnapshot.keyAt(i); + const FileState state = readSnapshot.valueAt(i); + + if (name != filenames[i] || states[i].modTime_sec != state.modTime_sec + || states[i].modTime_nsec != state.modTime_nsec + || states[i].size != state.size || states[i].crc32 != states[i].crc32) { + fprintf(stderr, "state %d expected={%d/%d, 0x%08x, 0x%08x, %3d} '%s'\n" + " actual={%d/%d, 0x%08x, 0x%08x, %3d} '%s'\n", i, + states[i].modTime_sec, states[i].modTime_nsec, states[i].size, states[i].crc32, + name.length(), filenames[i].string(), + state.modTime_sec, state.modTime_nsec, state.size, state.crc32, state.nameLen, + name.string()); + matched = false; + } + } + + return matched ? 0 : 1; +} + +// hexdump -v -e '" " 8/1 " 0x%02x," "\n"' data_writer.data +const unsigned char DATA_GOLDEN_FILE[] = { + 0x41, 0x70, 0x70, 0x31, 0x0b, 0x00, 0x00, 0x00, + 0x6e, 0x6f, 0x5f, 0x70, 0x61, 0x64, 0x64, 0x69, + 0x6e, 0x67, 0x5f, 0x00, 0x44, 0x61, 0x74, 0x61, + 0x0b, 0x00, 0x00, 0x00, 0x0c, 0x00, 0x00, 0x00, + 0x6e, 0x6f, 0x5f, 0x70, 0x61, 0x64, 0x64, 0x69, + 0x6e, 0x67, 0x5f, 0x00, 0x6e, 0x6f, 0x5f, 0x70, + 0x61, 0x64, 0x64, 0x69, 0x6e, 0x67, 0x5f, 0x00, + 0x41, 0x70, 0x70, 0x31, 0x0c, 0x00, 0x00, 0x00, + 0x70, 0x61, 0x64, 0x64, 0x65, 0x64, 0x5f, 0x74, + 0x6f, 0x5f, 0x5f, 0x33, 0x00, 0xbc, 0xbc, 0xbc, + 0x44, 0x61, 0x74, 0x61, 0x0c, 0x00, 0x00, 0x00, + 0x0d, 0x00, 0x00, 0x00, 0x70, 0x61, 0x64, 0x64, + 0x65, 0x64, 0x5f, 0x74, 0x6f, 0x5f, 0x5f, 0x33, + 0x00, 0xbc, 0xbc, 0xbc, 0x70, 0x61, 0x64, 0x64, + 0x65, 0x64, 0x5f, 0x74, 0x6f, 0x5f, 0x5f, 0x33, + 0x00, 0xbc, 0xbc, 0xbc, 0x41, 0x70, 0x70, 0x31, + 0x0d, 0x00, 0x00, 0x00, 0x70, 0x61, 0x64, 0x64, + 0x65, 0x64, 0x5f, 0x74, 0x6f, 0x5f, 0x32, 0x5f, + 0x5f, 0x00, 0xbc, 0xbc, 0x44, 0x61, 0x74, 0x61, + 0x0d, 0x00, 0x00, 0x00, 0x0e, 0x00, 0x00, 0x00, + 0x70, 0x61, 0x64, 0x64, 0x65, 0x64, 0x5f, 0x74, + 0x6f, 0x5f, 0x32, 0x5f, 0x5f, 0x00, 0xbc, 0xbc, + 0x70, 0x61, 0x64, 0x64, 0x65, 0x64, 0x5f, 0x74, + 0x6f, 0x5f, 0x32, 0x5f, 0x5f, 0x00, 0xbc, 0xbc, + 0x41, 0x70, 0x70, 0x31, 0x0a, 0x00, 0x00, 0x00, + 0x70, 0x61, 0x64, 0x64, 0x65, 0x64, 0x5f, 0x74, + 0x6f, 0x31, 0x00, 0xbc, 0x44, 0x61, 0x74, 0x61, + 0x0a, 0x00, 0x00, 0x00, 0x0b, 0x00, 0x00, 0x00, + 0x70, 0x61, 0x64, 0x64, 0x65, 0x64, 0x5f, 0x74, + 0x6f, 0x31, 0x00, 0xbc, 0x70, 0x61, 0x64, 0x64, + 0x65, 0x64, 0x5f, 0x74, 0x6f, 0x31, 0x00, 0xbc, + 0x46, 0x6f, 0x6f, 0x74, 0x04, 0x00, 0x00, 0x00, +}; +const int DATA_GOLDEN_FILE_SIZE = sizeof(DATA_GOLDEN_FILE); + +static int +test_write_header_and_entity(BackupDataWriter& writer, const char* str) +{ + int err; + String8 text(str); + + err = writer.WriteAppHeader(text); + if (err != 0) { + fprintf(stderr, "WriteAppHeader failed with %s\n", strerror(err)); + return err; + } + + err = writer.WriteEntityHeader(text, text.length()+1); + if (err != 0) { + fprintf(stderr, "WriteEntityHeader failed with %s\n", strerror(err)); + return err; + } + + err = writer.WriteEntityData(text.string(), text.length()+1); + if (err != 0) { + fprintf(stderr, "write failed for data '%s'\n", text.string()); + return errno; + } + + return err; +} + +int +backup_helper_test_data_writer() +{ + int err; + int fd; + const char* filename = SCRATCH_DIR "data_writer.data"; + + system("rm -r " SCRATCH_DIR); + mkdir(SCRATCH_DIR, 0777); + mkdir(SCRATCH_DIR "data", 0777); + + fd = creat(filename, 0666); + if (fd == -1) { + fprintf(stderr, "error creating: %s\n", strerror(errno)); + return errno; + } + + BackupDataWriter writer(fd); + + err = 0; + err |= test_write_header_and_entity(writer, "no_padding_"); + err |= test_write_header_and_entity(writer, "padded_to__3"); + err |= test_write_header_and_entity(writer, "padded_to_2__"); + err |= test_write_header_and_entity(writer, "padded_to1"); + + writer.WriteAppFooter(); + + close(fd); + + err = compare_file(filename, DATA_GOLDEN_FILE, DATA_GOLDEN_FILE_SIZE); + if (err != 0) { + return err; + } + + return err; +} + +static int +get_mod_time(const char* filename, struct timeval times[2]) +{ + int err; + struct stat64 st; + err = stat64(filename, &st); + if (err != 0) { + fprintf(stderr, "stat '%s' failed: %s\n", filename, strerror(errno)); + return errno; + } + times[0].tv_sec = st.st_atime; + times[0].tv_usec = st.st_atime_nsec / 1000; + times[1].tv_sec = st.st_mtime; + times[1].tv_usec = st.st_mtime_nsec / 1000; + return 0; +} + +int +backup_helper_test_files() +{ + int err; + int oldSnapshotFD; + int dataStreamFD; + int newSnapshotFD; + + system("rm -r " SCRATCH_DIR); + mkdir(SCRATCH_DIR, 0777); + mkdir(SCRATCH_DIR "data", 0777); + + write_text_file(SCRATCH_DIR "data/b", "b\nbb\n"); + write_text_file(SCRATCH_DIR "data/c", "c\ncc\n"); + write_text_file(SCRATCH_DIR "data/d", "d\ndd\n"); + write_text_file(SCRATCH_DIR "data/e", "e\nee\n"); + write_text_file(SCRATCH_DIR "data/f", "f\nff\n"); + write_text_file(SCRATCH_DIR "data/h", "h\nhh\n"); + + char const* files_before[] = { + "data/b", + "data/c", + "data/d", + "data/e", + "data/f" + }; + + dataStreamFD = creat(SCRATCH_DIR "1.data", 0666); + if (dataStreamFD == -1) { + fprintf(stderr, "error creating: %s\n", strerror(errno)); + return errno; + } + + newSnapshotFD = creat(SCRATCH_DIR "before.snap", 0666); + if (newSnapshotFD == -1) { + fprintf(stderr, "error creating: %s\n", strerror(errno)); + return errno; + } + + err = back_up_files(-1, dataStreamFD, newSnapshotFD, SCRATCH_DIR, files_before, 5); + if (err != 0) { + return err; + } + + close(dataStreamFD); + close(newSnapshotFD); + + sleep(3); + + struct timeval d_times[2]; + struct timeval e_times[2]; + + err = get_mod_time(SCRATCH_DIR "data/d", d_times); + err |= get_mod_time(SCRATCH_DIR "data/e", e_times); + if (err != 0) { + return err; + } + + write_text_file(SCRATCH_DIR "data/a", "a\naa\n"); + unlink(SCRATCH_DIR "data/c"); + write_text_file(SCRATCH_DIR "data/c", "c\ncc\n"); + write_text_file(SCRATCH_DIR "data/d", "dd\ndd\n"); + utimes(SCRATCH_DIR "data/d", d_times); + write_text_file(SCRATCH_DIR "data/e", "z\nzz\n"); + utimes(SCRATCH_DIR "data/e", e_times); + write_text_file(SCRATCH_DIR "data/g", "g\ngg\n"); + unlink(SCRATCH_DIR "data/f"); + + char const* files_after[] = { + "data/a", // added + "data/b", // same + "data/c", // different mod time + "data/d", // different size (same mod time) + "data/e", // different contents (same mod time, same size) + "data/g" // added + }; + + oldSnapshotFD = open(SCRATCH_DIR "before.snap", O_RDONLY); + if (oldSnapshotFD == -1) { + fprintf(stderr, "error opening: %s\n", strerror(errno)); + return errno; + } + + dataStreamFD = creat(SCRATCH_DIR "2.data", 0666); + if (dataStreamFD == -1) { + fprintf(stderr, "error creating: %s\n", strerror(errno)); + return errno; + } + + newSnapshotFD = creat(SCRATCH_DIR "after.snap", 0666); + if (newSnapshotFD == -1) { + fprintf(stderr, "error creating: %s\n", strerror(errno)); + return errno; + } + + err = back_up_files(oldSnapshotFD, dataStreamFD, newSnapshotFD, SCRATCH_DIR, files_after, 6); + if (err != 0) { + return err; + } + + close(oldSnapshotFD); + close(dataStreamFD); + close(newSnapshotFD); + + return 0; +} + +#endif // TEST_BACKUP_HELPERS + +} |