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// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package pull
import (
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"bufio"
"bytes"
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"strings"
"time"
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"code.gitea.io/gitea/models"
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"code.gitea.io/gitea/modules/git"
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"code.gitea.io/gitea/modules/graceful"
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"code.gitea.io/gitea/modules/log"
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"code.gitea.io/gitea/modules/notification"
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"code.gitea.io/gitea/modules/setting"
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issue_service "code.gitea.io/gitea/services/issue"
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"github.com/unknwon/com"
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)
// NewPullRequest creates new pull request with labels for repository.
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func NewPullRequest ( repo * models . Repository , pull * models . Issue , labelIDs [ ] int64 , uuids [ ] string , pr * models . PullRequest , assigneeIDs [ ] int64 ) error {
if err := TestPatch ( pr ) ; err != nil {
return err
}
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divergence , err := GetDiverging ( pr )
if err != nil {
return err
}
pr . CommitsAhead = divergence . Ahead
pr . CommitsBehind = divergence . Behind
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if err := models . NewPullRequest ( repo , pull , labelIDs , uuids , pr ) ; err != nil {
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return err
}
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for _ , assigneeID := range assigneeIDs {
if err := issue_service . AddAssigneeIfNotAssigned ( pull , pull . Poster , assigneeID ) ; err != nil {
return err
}
}
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pr . Issue = pull
pull . PullRequest = pr
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if err := PushToBaseRepo ( pr ) ; err != nil {
return err
}
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notification . NotifyNewPullRequest ( pr )
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// add first push codes comment
baseGitRepo , err := git . OpenRepository ( pr . BaseRepo . RepoPath ( ) )
if err != nil {
return err
}
defer baseGitRepo . Close ( )
compareInfo , err := baseGitRepo . GetCompareInfo ( pr . BaseRepo . RepoPath ( ) ,
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git . BranchPrefix + pr . BaseBranch , pr . GetGitRefName ( ) )
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if err != nil {
return err
}
if compareInfo . Commits . Len ( ) > 0 {
data := models . PushActionContent { IsForcePush : false }
data . CommitIDs = make ( [ ] string , 0 , compareInfo . Commits . Len ( ) )
for e := compareInfo . Commits . Back ( ) ; e != nil ; e = e . Prev ( ) {
data . CommitIDs = append ( data . CommitIDs , e . Value . ( * git . Commit ) . ID . String ( ) )
}
dataJSON , err := json . Marshal ( data )
if err != nil {
return err
}
ops := & models . CreateCommentOptions {
Type : models . CommentTypePullPush ,
Doer : pull . Poster ,
Repo : repo ,
Issue : pr . Issue ,
IsForcePush : false ,
Content : string ( dataJSON ) ,
}
_ , _ = models . CreateComment ( ops )
}
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return nil
}
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// ChangeTargetBranch changes the target branch of this pull request, as the given user.
func ChangeTargetBranch ( pr * models . PullRequest , doer * models . User , targetBranch string ) ( err error ) {
// Current target branch is already the same
if pr . BaseBranch == targetBranch {
return nil
}
if pr . Issue . IsClosed {
return models . ErrIssueIsClosed {
ID : pr . Issue . ID ,
RepoID : pr . Issue . RepoID ,
Index : pr . Issue . Index ,
}
}
if pr . HasMerged {
return models . ErrPullRequestHasMerged {
ID : pr . ID ,
IssueID : pr . Index ,
HeadRepoID : pr . HeadRepoID ,
BaseRepoID : pr . BaseRepoID ,
HeadBranch : pr . HeadBranch ,
BaseBranch : pr . BaseBranch ,
}
}
// Check if branches are equal
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branchesEqual , err := IsHeadEqualWithBranch ( pr , targetBranch )
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if err != nil {
return err
}
if branchesEqual {
return models . ErrBranchesEqual {
HeadBranchName : pr . HeadBranch ,
BaseBranchName : targetBranch ,
}
}
// Check if pull request for the new target branch already exists
existingPr , err := models . GetUnmergedPullRequest ( pr . HeadRepoID , pr . BaseRepoID , pr . HeadBranch , targetBranch )
if existingPr != nil {
return models . ErrPullRequestAlreadyExists {
ID : existingPr . ID ,
IssueID : existingPr . Index ,
HeadRepoID : existingPr . HeadRepoID ,
BaseRepoID : existingPr . BaseRepoID ,
HeadBranch : existingPr . HeadBranch ,
BaseBranch : existingPr . BaseBranch ,
}
}
if err != nil && ! models . IsErrPullRequestNotExist ( err ) {
return err
}
// Set new target branch
oldBranch := pr . BaseBranch
pr . BaseBranch = targetBranch
// Refresh patch
if err := TestPatch ( pr ) ; err != nil {
return err
}
// Update target branch, PR diff and status
// This is the same as checkAndUpdateStatus in check service, but also updates base_branch
if pr . Status == models . PullRequestStatusChecking {
pr . Status = models . PullRequestStatusMergeable
}
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// Update Commit Divergence
divergence , err := GetDiverging ( pr )
if err != nil {
return err
}
pr . CommitsAhead = divergence . Ahead
pr . CommitsBehind = divergence . Behind
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if err := pr . UpdateColsIfNotMerged ( "merge_base" , "status" , "conflicted_files" , "changed_protected_files" , "base_branch" , "commits_ahead" , "commits_behind" ) ; err != nil {
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return err
}
// Create comment
options := & models . CreateCommentOptions {
Type : models . CommentTypeChangeTargetBranch ,
Doer : doer ,
Repo : pr . Issue . Repo ,
Issue : pr . Issue ,
OldRef : oldBranch ,
NewRef : targetBranch ,
}
if _ , err = models . CreateComment ( options ) ; err != nil {
return fmt . Errorf ( "CreateChangeTargetBranchComment: %v" , err )
}
return nil
}
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func checkForInvalidation ( requests models . PullRequestList , repoID int64 , doer * models . User , branch string ) error {
repo , err := models . GetRepositoryByID ( repoID )
if err != nil {
return fmt . Errorf ( "GetRepositoryByID: %v" , err )
}
gitRepo , err := git . OpenRepository ( repo . RepoPath ( ) )
if err != nil {
return fmt . Errorf ( "git.OpenRepository: %v" , err )
}
go func ( ) {
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// FIXME: graceful: We need to tell the manager we're doing something...
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err := requests . InvalidateCodeComments ( doer , gitRepo , branch )
if err != nil {
log . Error ( "PullRequestList.InvalidateCodeComments: %v" , err )
}
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gitRepo . Close ( )
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} ( )
return nil
}
// AddTestPullRequestTask adds new test tasks by given head/base repository and head/base branch,
// and generate new patch for testing as needed.
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func AddTestPullRequestTask ( doer * models . User , repoID int64 , branch string , isSync bool , oldCommitID , newCommitID string ) {
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log . Trace ( "AddTestPullRequestTask [head_repo_id: %d, head_branch: %s]: finding pull requests" , repoID , branch )
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graceful . GetManager ( ) . RunWithShutdownContext ( func ( ctx context . Context ) {
// There is no sensible way to shut this down ":-("
// If you don't let it run all the way then you will lose data
// FIXME: graceful: AddTestPullRequestTask needs to become a queue!
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prs , err := models . GetUnmergedPullRequestsByHeadInfo ( repoID , branch )
if err != nil {
log . Error ( "Find pull requests [head_repo_id: %d, head_branch: %s]: %v" , repoID , branch , err )
return
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}
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if isSync {
requests := models . PullRequestList ( prs )
if err = requests . LoadAttributes ( ) ; err != nil {
log . Error ( "PullRequestList.LoadAttributes: %v" , err )
}
if invalidationErr := checkForInvalidation ( requests , repoID , doer , branch ) ; invalidationErr != nil {
log . Error ( "checkForInvalidation: %v" , invalidationErr )
}
if err == nil {
for _ , pr := range prs {
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if newCommitID != "" && newCommitID != git . EmptySHA {
changed , err := checkIfPRContentChanged ( pr , oldCommitID , newCommitID )
if err != nil {
log . Error ( "checkIfPRContentChanged: %v" , err )
}
if changed {
// Mark old reviews as stale if diff to mergebase has changed
if err := models . MarkReviewsAsStale ( pr . IssueID ) ; err != nil {
log . Error ( "MarkReviewsAsStale: %v" , err )
}
}
if err := models . MarkReviewsAsNotStale ( pr . IssueID , newCommitID ) ; err != nil {
log . Error ( "MarkReviewsAsNotStale: %v" , err )
}
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divergence , err := GetDiverging ( pr )
if err != nil {
log . Error ( "GetDiverging: %v" , err )
} else {
err = pr . UpdateCommitDivergence ( divergence . Ahead , divergence . Behind )
if err != nil {
log . Error ( "UpdateCommitDivergence: %v" , err )
}
}
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}
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pr . Issue . PullRequest = pr
notification . NotifyPullRequestSynchronized ( doer , pr )
}
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}
}
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for _ , pr := range prs {
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log . Trace ( "Updating PR[%d]: composing new test task" , pr . ID )
if err := PushToBaseRepo ( pr ) ; err != nil {
log . Error ( "PushToBaseRepo: %v" , err )
continue
}
AddToTaskQueue ( pr )
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comment , err := models . CreatePushPullComment ( doer , pr , oldCommitID , newCommitID )
if err == nil && comment != nil {
notification . NotifyPullRequestPushCommits ( doer , pr , comment )
}
}
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log . Trace ( "AddTestPullRequestTask [base_repo_id: %d, base_branch: %s]: finding pull requests" , repoID , branch )
prs , err = models . GetUnmergedPullRequestsByBaseInfo ( repoID , branch )
if err != nil {
log . Error ( "Find pull requests [base_repo_id: %d, base_branch: %s]: %v" , repoID , branch , err )
return
}
for _ , pr := range prs {
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divergence , err := GetDiverging ( pr )
if err != nil {
log . Error ( "GetDiverging: %v" , err )
} else {
err = pr . UpdateCommitDivergence ( divergence . Ahead , divergence . Behind )
if err != nil {
log . Error ( "UpdateCommitDivergence: %v" , err )
}
}
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AddToTaskQueue ( pr )
}
} )
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}
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// checkIfPRContentChanged checks if diff to target branch has changed by push
// A commit can be considered to leave the PR untouched if the patch/diff with its merge base is unchanged
func checkIfPRContentChanged ( pr * models . PullRequest , oldCommitID , newCommitID string ) ( hasChanged bool , err error ) {
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if err = pr . LoadHeadRepo ( ) ; err != nil {
return false , fmt . Errorf ( "LoadHeadRepo: %v" , err )
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} else if pr . HeadRepo == nil {
// corrupt data assumed changed
return true , nil
}
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if err = pr . LoadBaseRepo ( ) ; err != nil {
return false , fmt . Errorf ( "LoadBaseRepo: %v" , err )
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}
headGitRepo , err := git . OpenRepository ( pr . HeadRepo . RepoPath ( ) )
if err != nil {
return false , fmt . Errorf ( "OpenRepository: %v" , err )
}
defer headGitRepo . Close ( )
// Add a temporary remote.
tmpRemote := "checkIfPRContentChanged-" + com . ToStr ( time . Now ( ) . UnixNano ( ) )
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if err = headGitRepo . AddRemote ( tmpRemote , pr . BaseRepo . RepoPath ( ) , true ) ; err != nil {
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return false , fmt . Errorf ( "AddRemote: %s/%s-%s: %v" , pr . HeadRepo . OwnerName , pr . HeadRepo . Name , tmpRemote , err )
}
defer func ( ) {
if err := headGitRepo . RemoveRemote ( tmpRemote ) ; err != nil {
log . Error ( "checkIfPRContentChanged: RemoveRemote: %s/%s-%s: %v" , pr . HeadRepo . OwnerName , pr . HeadRepo . Name , tmpRemote , err )
}
} ( )
// To synchronize repo and get a base ref
_ , base , err := headGitRepo . GetMergeBase ( tmpRemote , pr . BaseBranch , pr . HeadBranch )
if err != nil {
return false , fmt . Errorf ( "GetMergeBase: %v" , err )
}
diffBefore := & bytes . Buffer { }
diffAfter := & bytes . Buffer { }
if err := headGitRepo . GetDiffFromMergeBase ( base , oldCommitID , diffBefore ) ; err != nil {
// If old commit not found, assume changed.
log . Debug ( "GetDiffFromMergeBase: %v" , err )
return true , nil
}
if err := headGitRepo . GetDiffFromMergeBase ( base , newCommitID , diffAfter ) ; err != nil {
// New commit should be found
return false , fmt . Errorf ( "GetDiffFromMergeBase: %v" , err )
}
diffBeforeLines := bufio . NewScanner ( diffBefore )
diffAfterLines := bufio . NewScanner ( diffAfter )
for diffBeforeLines . Scan ( ) && diffAfterLines . Scan ( ) {
if strings . HasPrefix ( diffBeforeLines . Text ( ) , "index" ) && strings . HasPrefix ( diffAfterLines . Text ( ) , "index" ) {
// file hashes can change without the diff changing
continue
} else if strings . HasPrefix ( diffBeforeLines . Text ( ) , "@@" ) && strings . HasPrefix ( diffAfterLines . Text ( ) , "@@" ) {
// the location of the difference may change
continue
} else if ! bytes . Equal ( diffBeforeLines . Bytes ( ) , diffAfterLines . Bytes ( ) ) {
return true , nil
}
}
if diffBeforeLines . Scan ( ) || diffAfterLines . Scan ( ) {
// Diffs not of equal length
return true , nil
}
return false , nil
}
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// PushToBaseRepo pushes commits from branches of head repository to
// corresponding branches of base repository.
// FIXME: Only push branches that are actually updates?
func PushToBaseRepo ( pr * models . PullRequest ) ( err error ) {
log . Trace ( "PushToBaseRepo[%d]: pushing commits to base repo '%s'" , pr . BaseRepoID , pr . GetGitRefName ( ) )
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if err := pr . LoadHeadRepo ( ) ; err != nil {
log . Error ( "Unable to load head repository for PR[%d] Error: %v" , pr . ID , err )
return err
}
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headRepoPath := pr . HeadRepo . RepoPath ( )
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if err := pr . LoadBaseRepo ( ) ; err != nil {
log . Error ( "Unable to load base repository for PR[%d] Error: %v" , pr . ID , err )
return err
}
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baseRepoPath := pr . BaseRepo . RepoPath ( )
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if err = pr . LoadIssue ( ) ; err != nil {
return fmt . Errorf ( "unable to load issue %d for pr %d: %v" , pr . IssueID , pr . ID , err )
}
if err = pr . Issue . LoadPoster ( ) ; err != nil {
return fmt . Errorf ( "unable to load poster %d for pr %d: %v" , pr . Issue . PosterID , pr . ID , err )
}
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gitRefName := pr . GetGitRefName ( )
if err := git . Push ( headRepoPath , git . PushOptions {
Remote : baseRepoPath ,
Branch : pr . HeadBranch + ":" + gitRefName ,
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Force : true ,
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// Use InternalPushingEnvironment here because we know that pre-receive and post-receive do not run on a refs/pulls/...
Env : models . InternalPushingEnvironment ( pr . Issue . Poster , pr . BaseRepo ) ,
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} ) ; err != nil {
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if git . IsErrPushOutOfDate ( err ) {
// This should not happen as we're using force!
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log . Error ( "Unable to push PR head for %s#%d (%-v:%s) due to ErrPushOfDate: %v" , pr . BaseRepo . FullName ( ) , pr . Index , pr . BaseRepo , gitRefName , err )
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return err
} else if git . IsErrPushRejected ( err ) {
rejectErr := err . ( * git . ErrPushRejected )
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log . Info ( "Unable to push PR head for %s#%d (%-v:%s) due to rejection:\nStdout: %s\nStderr: %s\nError: %v" , pr . BaseRepo . FullName ( ) , pr . Index , pr . BaseRepo , gitRefName , rejectErr . StdOut , rejectErr . StdErr , rejectErr . Err )
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return err
}
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log . Error ( "Unable to push PR head for %s#%d (%-v:%s) due to Error: %v" , pr . BaseRepo . FullName ( ) , pr . Index , pr . BaseRepo , gitRefName , err )
return fmt . Errorf ( "Push: %s:%s %s:%s %v" , pr . HeadRepo . FullName ( ) , pr . HeadBranch , pr . BaseRepo . FullName ( ) , gitRefName , err )
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}
return nil
}
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type errlist [ ] error
func ( errs errlist ) Error ( ) string {
if len ( errs ) > 0 {
var buf strings . Builder
for i , err := range errs {
if i > 0 {
buf . WriteString ( ", " )
}
buf . WriteString ( err . Error ( ) )
}
return buf . String ( )
}
return ""
}
// CloseBranchPulls close all the pull requests who's head branch is the branch
func CloseBranchPulls ( doer * models . User , repoID int64 , branch string ) error {
prs , err := models . GetUnmergedPullRequestsByHeadInfo ( repoID , branch )
if err != nil {
return err
}
prs2 , err := models . GetUnmergedPullRequestsByBaseInfo ( repoID , branch )
if err != nil {
return err
}
prs = append ( prs , prs2 ... )
if err := models . PullRequestList ( prs ) . LoadAttributes ( ) ; err != nil {
return err
}
var errs errlist
for _ , pr := range prs {
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if err = issue_service . ChangeStatus ( pr . Issue , doer , true ) ; err != nil && ! models . IsErrPullWasClosed ( err ) {
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errs = append ( errs , err )
}
}
if len ( errs ) > 0 {
return errs
}
return nil
}
// CloseRepoBranchesPulls close all pull requests which head branches are in the given repository
func CloseRepoBranchesPulls ( doer * models . User , repo * models . Repository ) error {
branches , err := git . GetBranchesByPath ( repo . RepoPath ( ) )
if err != nil {
return err
}
var errs errlist
for _ , branch := range branches {
prs , err := models . GetUnmergedPullRequestsByHeadInfo ( repo . ID , branch . Name )
if err != nil {
return err
}
if err = models . PullRequestList ( prs ) . LoadAttributes ( ) ; err != nil {
return err
}
for _ , pr := range prs {
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if err = issue_service . ChangeStatus ( pr . Issue , doer , true ) ; err != nil && ! models . IsErrPullWasClosed ( err ) {
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errs = append ( errs , err )
}
}
}
if len ( errs ) > 0 {
return errs
}
return nil
}
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// GetCommitMessages returns the commit messages between head and merge base (if there is one)
func GetCommitMessages ( pr * models . PullRequest ) string {
if err := pr . LoadIssue ( ) ; err != nil {
log . Error ( "Cannot load issue %d for PR id %d: Error: %v" , pr . IssueID , pr . ID , err )
return ""
}
if err := pr . Issue . LoadPoster ( ) ; err != nil {
log . Error ( "Cannot load poster %d for pr id %d, index %d Error: %v" , pr . Issue . PosterID , pr . ID , pr . Index , err )
return ""
}
if pr . HeadRepo == nil {
var err error
pr . HeadRepo , err = models . GetRepositoryByID ( pr . HeadRepoID )
if err != nil {
log . Error ( "GetRepositoryById[%d]: %v" , pr . HeadRepoID , err )
return ""
}
}
gitRepo , err := git . OpenRepository ( pr . HeadRepo . RepoPath ( ) )
if err != nil {
log . Error ( "Unable to open head repository: Error: %v" , err )
return ""
}
defer gitRepo . Close ( )
headCommit , err := gitRepo . GetBranchCommit ( pr . HeadBranch )
if err != nil {
log . Error ( "Unable to get head commit: %s Error: %v" , pr . HeadBranch , err )
return ""
}
mergeBase , err := gitRepo . GetCommit ( pr . MergeBase )
if err != nil {
log . Error ( "Unable to get merge base commit: %s Error: %v" , pr . MergeBase , err )
return ""
}
limit := setting . Repository . PullRequest . DefaultMergeMessageCommitsLimit
list , err := gitRepo . CommitsBetweenLimit ( headCommit , mergeBase , limit , 0 )
if err != nil {
log . Error ( "Unable to get commits between: %s %s Error: %v" , pr . HeadBranch , pr . MergeBase , err )
return ""
}
maxSize := setting . Repository . PullRequest . DefaultMergeMessageSize
posterSig := pr . Issue . Poster . NewGitSig ( ) . String ( )
authorsMap := map [ string ] bool { }
authors := make ( [ ] string , 0 , list . Len ( ) )
stringBuilder := strings . Builder { }
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// commits list is in reverse chronological order
element := list . Back ( )
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for element != nil {
commit := element . Value . ( * git . Commit )
if maxSize < 0 || stringBuilder . Len ( ) < maxSize {
toWrite := [ ] byte ( commit . CommitMessage )
if len ( toWrite ) > maxSize - stringBuilder . Len ( ) && maxSize > - 1 {
toWrite = append ( toWrite [ : maxSize - stringBuilder . Len ( ) ] , "..." ... )
}
if _ , err := stringBuilder . Write ( toWrite ) ; err != nil {
log . Error ( "Unable to write commit message Error: %v" , err )
return ""
}
if _ , err := stringBuilder . WriteRune ( '\n' ) ; err != nil {
log . Error ( "Unable to write commit message Error: %v" , err )
return ""
}
}
authorString := commit . Author . String ( )
if ! authorsMap [ authorString ] && authorString != posterSig {
authors = append ( authors , authorString )
authorsMap [ authorString ] = true
}
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element = element . Prev ( )
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}
// Consider collecting the remaining authors
if limit >= 0 && setting . Repository . PullRequest . DefaultMergeMessageAllAuthors {
skip := limit
limit = 30
for {
list , err := gitRepo . CommitsBetweenLimit ( headCommit , mergeBase , limit , skip )
if err != nil {
log . Error ( "Unable to get commits between: %s %s Error: %v" , pr . HeadBranch , pr . MergeBase , err )
return ""
}
if list . Len ( ) == 0 {
break
}
element := list . Front ( )
for element != nil {
commit := element . Value . ( * git . Commit )
authorString := commit . Author . String ( )
if ! authorsMap [ authorString ] && authorString != posterSig {
authors = append ( authors , authorString )
authorsMap [ authorString ] = true
}
element = element . Next ( )
}
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skip += limit
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}
}
if len ( authors ) > 0 {
if _ , err := stringBuilder . WriteRune ( '\n' ) ; err != nil {
log . Error ( "Unable to write to string builder Error: %v" , err )
return ""
}
}
for _ , author := range authors {
if _ , err := stringBuilder . Write ( [ ] byte ( "Co-authored-by: " ) ) ; err != nil {
log . Error ( "Unable to write to string builder Error: %v" , err )
return ""
}
if _ , err := stringBuilder . Write ( [ ] byte ( author ) ) ; err != nil {
log . Error ( "Unable to write to string builder Error: %v" , err )
return ""
}
if _ , err := stringBuilder . WriteRune ( '\n' ) ; err != nil {
log . Error ( "Unable to write to string builder Error: %v" , err )
return ""
}
}
return stringBuilder . String ( )
}
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// GetLastCommitStatus returns list of commit statuses for latest commit on this pull request.
func GetLastCommitStatus ( pr * models . PullRequest ) ( status [ ] * models . CommitStatus , err error ) {
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if err = pr . LoadBaseRepo ( ) ; err != nil {
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return nil , err
}
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gitRepo , err := git . OpenRepository ( pr . BaseRepo . RepoPath ( ) )
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if err != nil {
return nil , err
}
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defer gitRepo . Close ( )
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compareInfo , err := gitRepo . GetCompareInfo ( pr . BaseRepo . RepoPath ( ) , pr . MergeBase , pr . GetGitRefName ( ) )
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if err != nil {
return nil , err
}
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if compareInfo . Commits . Len ( ) == 0 {
return nil , errors . New ( "pull request has no commits" )
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}
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sha := compareInfo . Commits . Front ( ) . Value . ( * git . Commit ) . ID . String ( )
statusList , err := models . GetLatestCommitStatus ( pr . BaseRepo . ID , sha , models . ListOptions { } )
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if err != nil {
return nil , err
}
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return statusList , nil
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}
// IsHeadEqualWithBranch returns if the commits of branchName are available in pull request head
func IsHeadEqualWithBranch ( pr * models . PullRequest , branchName string ) ( bool , error ) {
var err error
if err = pr . LoadBaseRepo ( ) ; err != nil {
return false , err
}
baseGitRepo , err := git . OpenRepository ( pr . BaseRepo . RepoPath ( ) )
if err != nil {
return false , err
}
baseCommit , err := baseGitRepo . GetBranchCommit ( branchName )
if err != nil {
return false , err
}
if err = pr . LoadHeadRepo ( ) ; err != nil {
return false , err
}
headGitRepo , err := git . OpenRepository ( pr . HeadRepo . RepoPath ( ) )
if err != nil {
return false , err
}
headCommit , err := headGitRepo . GetBranchCommit ( pr . HeadBranch )
if err != nil {
return false , err
}
return baseCommit . HasPreviousCommit ( headCommit . ID )
}