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authorTao Bao <tbao@google.com>2019-09-23 19:28:54 +0200
committerTao Bao <tbao@google.com>2019-09-23 20:26:48 +0200
commit5234ad466c7006430fcd62f0f0ceeb768da5ec93 (patch)
treeb7ab0af76118d4227d58c098c5db7991ece384b9 /applypatch
parentapplypatch: Use static libs for libbrotli and libbz. (diff)
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Diffstat (limited to 'applypatch')
-rw-r--r--applypatch/applypatch.cpp16
-rw-r--r--applypatch/applypatch_modes.cpp2
-rw-r--r--applypatch/include/applypatch/applypatch.h7
3 files changed, 14 insertions, 11 deletions
diff --git a/applypatch/applypatch.cpp b/applypatch/applypatch.cpp
index 90d8e8604..336860cb9 100644
--- a/applypatch/applypatch.cpp
+++ b/applypatch/applypatch.cpp
@@ -47,7 +47,7 @@
using namespace std::string_literals;
static bool GenerateTarget(const Partition& target, const FileContents& source_file,
- const Value& patch, const Value* bonus_data);
+ const Value& patch, const Value* bonus_data, bool backup_source);
bool LoadFileContents(const std::string& filename, FileContents* file) {
// No longer allow loading contents from eMMC partitions.
@@ -266,7 +266,7 @@ int ShowLicenses() {
}
bool PatchPartition(const Partition& target, const Partition& source, const Value& patch,
- const Value* bonus) {
+ const Value* bonus, bool backup_source) {
LOG(INFO) << "Patching " << target.name;
// We try to load and check against the target hash first.
@@ -280,7 +280,7 @@ bool PatchPartition(const Partition& target, const Partition& source, const Valu
FileContents source_file;
if (ReadPartitionToBuffer(source, &source_file, true)) {
- return GenerateTarget(target, source_file, patch, bonus);
+ return GenerateTarget(target, source_file, patch, bonus, backup_source);
}
LOG(ERROR) << "Failed to find any match";
@@ -326,7 +326,7 @@ bool FlashPartition(const Partition& partition, const std::string& source_filena
}
static bool GenerateTarget(const Partition& target, const FileContents& source_file,
- const Value& patch, const Value* bonus_data) {
+ const Value& patch, const Value* bonus_data, bool backup_source) {
uint8_t expected_sha1[SHA_DIGEST_LENGTH];
if (ParseSha1(target.hash, expected_sha1) != 0) {
LOG(ERROR) << "Failed to parse target hash \"" << target.hash << "\"";
@@ -351,11 +351,11 @@ static bool GenerateTarget(const Partition& target, const FileContents& source_f
}
// We write the original source to cache, in case the partition write is interrupted.
- if (!CheckAndFreeSpaceOnCache(source_file.data.size())) {
+ if (backup_source && !CheckAndFreeSpaceOnCache(source_file.data.size())) {
LOG(ERROR) << "Not enough free space on /cache";
return false;
}
- if (!SaveFileContents(Paths::Get().cache_temp_source(), &source_file)) {
+ if (backup_source && !SaveFileContents(Paths::Get().cache_temp_source(), &source_file)) {
LOG(ERROR) << "Failed to back up source file";
return false;
}
@@ -415,7 +415,9 @@ static bool GenerateTarget(const Partition& target, const FileContents& source_f
}
// Delete the backup copy of the source.
- unlink(Paths::Get().cache_temp_source().c_str());
+ if (backup_source) {
+ unlink(Paths::Get().cache_temp_source().c_str());
+ }
// Success!
return true;
diff --git a/applypatch/applypatch_modes.cpp b/applypatch/applypatch_modes.cpp
index b46659808..bb5eeae9d 100644
--- a/applypatch/applypatch_modes.cpp
+++ b/applypatch/applypatch_modes.cpp
@@ -87,7 +87,7 @@ static int PatchMode(const std::string& target_emmc, const std::string& source_e
bonus = std::make_unique<Value>(Value::Type::BLOB, std::move(bonus_contents));
}
- return PatchPartition(target, source, patch, bonus.get()) ? 0 : 1;
+ return PatchPartition(target, source, patch, bonus.get(), false) ? 0 : 1;
}
static void Usage() {
diff --git a/applypatch/include/applypatch/applypatch.h b/applypatch/include/applypatch/applypatch.h
index 6fc6f0fc9..799f4b2d7 100644
--- a/applypatch/include/applypatch/applypatch.h
+++ b/applypatch/include/applypatch/applypatch.h
@@ -73,10 +73,11 @@ std::ostream& operator<<(std::ostream& os, const Partition& partition);
// the 'target' Partition. While patching, it will backup the data on the source partition to
// /cache, so that the patching could be resumed on interruption even if both of the source and
// target partitions refer to the same device. The function is idempotent if called multiple times.
-// An optional arg 'bonus' can be provided, if the patch was generated with a bonus output.
-// Returns the patching result.
+// 'bonus' can be provided if the patch was generated with a bonus output, or nullptr.
+// 'backup_source' indicates whether the source partition should be backed up prior to the update
+// (e.g. when doing in-place update). Returns the patching result.
bool PatchPartition(const Partition& target, const Partition& source, const Value& patch,
- const Value* bonus);
+ const Value* bonus, bool backup_source);
// Returns whether the contents of the eMMC target or the cached file match the embedded hash.
// It will look for the backup on /cache if the given partition doesn't match the checksum.