This PR defines the snapshotter protocol
```swift
///Mount a snapshot and all its previous layers
func prepare(_ snapshot: Snapshot) async throws -> Snapshot
/// Commit a snapshot, making it permanent.
func commit(_ snapshot: Snapshot) async throws -> Snapshot
/// Remove a snapshot from snapshot store
func remove(_ snapshot: Snapshot) async throws
```
It updates executors to work with this new protocol
This PR introduces the `Differ` with methods:
```swift
// Differ protocol
func diff(base: Snapshot?, target: Snapshot) async throws -> Descriptor
func apply(descriptor: Descriptor, to base: Snapshot?) async throws -> Snapshot
```
It also introduces `DiffKey`, which is a MerkeTree based key for fast
diff computations between two dirs
Remove the option token from the dockerfile tokenizer for the native
builder. This cleans up some of the logic around handling options
depending on if they're instruction options or user provided options to
a command.
Signed-off-by: Kathryn Baldauf <k_baldauf@apple.com>
This PR adds support for CMD and LABEL instructions in the native
builder's parser.
This also changes how options are tokenized. Options now include the raw
string so that when constructing a command for instructions like CMD and
RUN, we can use the exact user input without having to add logic in the
tokenizer to know when we're parsing a command verses other options,
etc.
Closes https://github.com/apple/container/issues/428 and
https://github.com/apple/container/issues/429
Signed-off-by: Kathryn Baldauf <k_baldauf@apple.com>
We're working on making a pure swift container image build system that
leverages containerization. This PR represents our initial design and
initial work towards this goal.
The native builder is still in active development and most of the
implementation has not been started or completed. We will be opening a
series of issues that represent various (but not necessarily all) pieces
of work that need to be done here.
There are docs included in this PR that describe the overall design of
each component and outline some of our goals. The easiest way to view
the docs by themselves (since this is a massive PR) is to look at the
docs commit in the `Commits` tab.
We'd love any feedback!
@wlan0
---------
Signed-off-by: Kathryn Baldauf <k_baldauf@apple.com>
Dmitry Kovba