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-/*
-Copyright 2015 Google Inc. All rights reserved.
-
-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.
-*/
-
-// Package repository contains helper methods for working with a Git repo.
-package repository
-
-// Note represents the contents of a git-note
-type Note []byte
-
-// CommitDetails represents the contents of a commit.
-type CommitDetails struct {
-	Author      string   `json:"author,omitempty"`
-	AuthorEmail string   `json:"authorEmail,omitempty"`
-	Tree        string   `json:"tree,omitempty"`
-	Time        string   `json:"time,omitempty"`
-	Parents     []string `json:"parents,omitempty"`
-	Summary     string   `json:"summary,omitempty"`
-}
-
-// Repo represents a source code repository.
-type Repo interface {
-	// GetPath returns the path to the repo.
-	GetPath() string
-
-	// GetRepoStateHash returns a hash which embodies the entire current state of a repository.
-	GetRepoStateHash() (string, error)
-
-	// GetUserEmail returns the email address that the user has used to configure git.
-	GetUserEmail() (string, error)
-
-	// GetUserSigningKey returns the key id the user has configured for
-	// sigining git artifacts.
-	GetUserSigningKey() (string, error)
-
-	// GetCoreEditor returns the name of the editor that the user has used to configure git.
-	GetCoreEditor() (string, error)
-
-	// GetSubmitStrategy returns the way in which a review is submitted
-	GetSubmitStrategy() (string, error)
-
-	// HasUncommittedChanges returns true if there are local, uncommitted changes.
-	HasUncommittedChanges() (bool, error)
-
-	// VerifyCommit verifies that the supplied hash points to a known commit.
-	VerifyCommit(hash string) error
-
-	// VerifyGitRef verifies that the supplied ref points to a known commit.
-	VerifyGitRef(ref string) error
-
-	// GetHeadRef returns the ref that is the current HEAD.
-	GetHeadRef() (string, error)
-
-	// GetCommitHash returns the hash of the commit pointed to by the given ref.
-	GetCommitHash(ref string) (string, error)
-
-	// ResolveRefCommit returns the commit pointed to by the given ref, which may be a remote ref.
-	//
-	// This differs from GetCommitHash which only works on exact matches, in that it will try to
-	// intelligently handle the scenario of a ref not existing locally, but being known to exist
-	// in a remote repo.
-	//
-	// This method should be used when a command may be performed by either the reviewer or the
-	// reviewee, while GetCommitHash should be used when the encompassing command should only be
-	// performed by the reviewee.
-	ResolveRefCommit(ref string) (string, error)
-
-	// GetCommitMessage returns the message stored in the commit pointed to by the given ref.
-	GetCommitMessage(ref string) (string, error)
-
-	// GetCommitTime returns the commit time of the commit pointed to by the given ref.
-	GetCommitTime(ref string) (string, error)
-
-	// GetLastParent returns the last parent of the given commit (as ordered by git).
-	GetLastParent(ref string) (string, error)
-
-	// GetCommitDetails returns the details of a commit's metadata.
-	GetCommitDetails(ref string) (*CommitDetails, error)
-
-	// MergeBase determines if the first commit that is an ancestor of the two arguments.
-	MergeBase(a, b string) (string, error)
-
-	// IsAncestor determines if the first argument points to a commit that is an ancestor of the second.
-	IsAncestor(ancestor, descendant string) (bool, error)
-
-	// Diff computes the diff between two given commits.
-	Diff(left, right string, diffArgs ...string) (string, error)
-
-	// Show returns the contents of the given file at the given commit.
-	Show(commit, path string) (string, error)
-
-	// SwitchToRef changes the currently-checked-out ref.
-	SwitchToRef(ref string) error
-
-	// ArchiveRef adds the current commit pointed to by the 'ref' argument
-	// under the ref specified in the 'archive' argument.
-	//
-	// Both the 'ref' and 'archive' arguments are expected to be the fully
-	// qualified names of git refs (e.g. 'refs/heads/my-change' or
-	// 'refs/archive/devtools').
-	//
-	// If the ref pointed to by the 'archive' argument does not exist
-	// yet, then it will be created.
-	ArchiveRef(ref, archive string) error
-
-	// MergeRef merges the given ref into the current one.
-	//
-	// The ref argument is the ref to merge, and fastForward indicates that the
-	// current ref should only move forward, as opposed to creating a bubble merge.
-	// The messages argument(s) provide text that should be included in the default
-	// merge commit message (separated by blank lines).
-	MergeRef(ref string, fastForward bool, messages ...string) error
-
-	// MergeAndSignRef merges the given ref into the current one and signs the
-	// merge.
-	//
-	// The ref argument is the ref to merge, and fastForward indicates that the
-	// current ref should only move forward, as opposed to creating a bubble merge.
-	// The messages argument(s) provide text that should be included in the default
-	// merge commit message (separated by blank lines).
-	MergeAndSignRef(ref string, fastForward bool, messages ...string) error
-
-	// RebaseRef rebases the current ref onto the given one.
-	RebaseRef(ref string) error
-
-	// RebaseAndSignRef rebases the current ref onto the given one and signs
-	// the result.
-	RebaseAndSignRef(ref string) error
-
-	// ListCommits returns the list of commits reachable from the given ref.
-	//
-	// The generated list is in chronological order (with the oldest commit first).
-	//
-	// If the specified ref does not exist, then this method returns an empty result.
-	ListCommits(ref string) []string
-
-	// ListCommitsBetween returns the list of commits between the two given revisions.
-	//
-	// The "from" parameter is the starting point (exclusive), and the "to"
-	// parameter is the ending point (inclusive).
-	//
-	// The "from" commit does not need to be an ancestor of the "to" commit. If it
-	// is not, then the merge base of the two is used as the starting point.
-	// Admittedly, this makes calling these the "between" commits is a bit of a
-	// misnomer, but it also makes the method easier to use when you want to
-	// generate the list of changes in a feature branch, as it eliminates the need
-	// to explicitly calculate the merge base. This also makes the semantics of the
-	// method compatible with git's built-in "rev-list" command.
-	//
-	// The generated list is in chronological order (with the oldest commit first).
-	ListCommitsBetween(from, to string) ([]string, error)
-
-	// GetNotes reads the notes from the given ref that annotate the given revision.
-	GetNotes(notesRef, revision string) []Note
-
-	// GetAllNotes reads the contents of the notes under the given ref for every commit.
-	//
-	// The returned value is a mapping from commit hash to the list of notes for that commit.
-	//
-	// This is the batch version of the corresponding GetNotes(...) method.
-	GetAllNotes(notesRef string) (map[string][]Note, error)
-
-	// AppendNote appends a note to a revision under the given ref.
-	AppendNote(ref, revision string, note Note) error
-
-	// ListNotedRevisions returns the collection of revisions that are annotated by notes in the given ref.
-	ListNotedRevisions(notesRef string) []string
-
-	// PushNotes pushes git notes to a remote repo.
-	PushNotes(remote, notesRefPattern string) error
-
-	// PullNotes fetches the contents of the given notes ref from a remote repo,
-	// and then merges them with the corresponding local notes using the
-	// "cat_sort_uniq" strategy.
-	PullNotes(remote, notesRefPattern string) error
-
-	// PushNotesAndArchive pushes the given notes and archive refs to a remote repo.
-	PushNotesAndArchive(remote, notesRefPattern, archiveRefPattern string) error
-
-	// PullNotesAndArchive fetches the contents of the notes and archives refs from
-	// a remote repo, and merges them with the corresponding local refs.
-	//
-	// For notes refs, we assume that every note can be automatically merged using
-	// the 'cat_sort_uniq' strategy (the git-appraise schemas fit that requirement),
-	// so we automatically merge the remote notes into the local notes.
-	//
-	// For "archive" refs, they are expected to be used solely for maintaining
-	// reachability of commits that are part of the history of any reviews,
-	// so we do not maintain any consistency with their tree objects. Instead,
-	// we merely ensure that their history graph includes every commit that we
-	// intend to keep.
-	PullNotesAndArchive(remote, notesRefPattern, archiveRefPattern string) error
-
-	// MergeNotes merges in the remote's state of the archives reference into
-	// the local repository's.
-	MergeNotes(remote, notesRefPattern string) error
-	// MergeArchives merges in the remote's state of the archives reference
-	// into the local repository's.
-	MergeArchives(remote, archiveRefPattern string) error
-
-	// FetchAndReturnNewReviewHashes fetches the notes "branches" and then
-	// susses out the IDs (the revision the review points to) of any new
-	// reviews, then returns that list of IDs.
-	//
-	// This is accomplished by determining which files in the notes tree have
-	// changed because the _names_ of these files correspond to the revisions
-	// they point to.
-	FetchAndReturnNewReviewHashes(remote, notesRefPattern, archiveRefPattern string) ([]string, error)
-}