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Abort merge if head has been updated before pressing merge (#18032)

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* Abort merge if head has been updated before pressing merge

It is possible that a PR head may be pushed to between the merge page being shown
and the merge button being pressed. Pass the current expected head in as a parameter
and cancel the merge if it has changed.

Fix #18028

Signed-off-by: Andrew Thornton <art27@cantab.net>

* adjust swagger

Signed-off-by: Andrew Thornton <art27@cantab.net>

* fix test

Signed-off-by: Andrew Thornton <art27@cantab.net>

* placate lint

Signed-off-by: Andrew Thornton <art27@cantab.net>
This commit is contained in:
zeripath 2021-12-20 00:32:54 +00:00 committed by GitHub
parent b24a965b81
commit e4e411821d
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GPG key ID: 4AEE18F83AFDEB23
9 changed files with 42 additions and 9 deletions
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6
integrations/pull_merge_test.go
View file

@ -241,11 +241,11 @@ func TestCantMergeConflict(t *testing.T) {
gitRepo, err := git.OpenRepository(repo_model.RepoPath(user1.Name, repo1.Name))
assert.NoError(t, err)
err = pull.Merge(pr, user1, gitRepo, repo_model.MergeStyleMerge, "CONFLICT")
err = pull.Merge(pr, user1, gitRepo, repo_model.MergeStyleMerge, "", "CONFLICT")
assert.Error(t, err, "Merge should return an error due to conflict")
assert.True(t, models.IsErrMergeConflicts(err), "Merge error is not a conflict error")
err = pull.Merge(pr, user1, gitRepo, repo_model.MergeStyleRebase, "CONFLICT")
err = pull.Merge(pr, user1, gitRepo, repo_model.MergeStyleRebase, "", "CONFLICT")
assert.Error(t, err, "Merge should return an error due to conflict")
assert.True(t, models.IsErrRebaseConflicts(err), "Merge error is not a conflict error")
gitRepo.Close()
@ -329,7 +329,7 @@ func TestCantMergeUnrelated(t *testing.T) {
BaseBranch: "base",
}).(*models.PullRequest)
err = pull.Merge(pr, user1, gitRepo, repo_model.MergeStyleMerge, "UNRELATED")
err = pull.Merge(pr, user1, gitRepo, repo_model.MergeStyleMerge, "", "UNRELATED")
assert.Error(t, err, "Merge should return an error due to unrelated")
assert.True(t, models.IsErrMergeUnrelatedHistories(err), "Merge error is not a unrelated histories error")
gitRepo.Close()

1
options/locale/locale_en-US.ini
View file

@ -1506,6 +1506,7 @@ pulls.rebase_conflict_summary = Error Message
; </summary><code>%[2]s<br>%[3]s</code></details>
pulls.unrelated_histories = Merge Failed: The merge head and base do not share a common history. Hint: Try a different strategy
pulls.merge_out_of_date = Merge Failed: Whilst generating the merge, the base was updated. Hint: Try again.
pulls.head_out_of_date = Merge Failed: Whilst generating the merge, the head was updated. Hint: Try again.
pulls.push_rejected = Merge Failed: The push was rejected. Review the githooks for this repository.
pulls.push_rejected_summary = Full Rejection Message
pulls.push_rejected_no_message = Merge Failed: The push was rejected but there was no remote message.<br>Review the githooks for this repository

5
routers/api/v1/repo/pull.go
View file

@ -838,7 +838,7 @@ func MergePullRequest(ctx *context.APIContext) {
message += "\n\n" + form.MergeMessageField
}
if err := pull_service.Merge(pr, ctx.User, ctx.Repo.GitRepo, repo_model.MergeStyle(form.Do), message); err != nil {
if err := pull_service.Merge(pr, ctx.User, ctx.Repo.GitRepo, repo_model.MergeStyle(form.Do), form.HeadCommitID, message); err != nil {
if models.IsErrInvalidMergeStyle(err) {
ctx.Error(http.StatusMethodNotAllowed, "Invalid merge style", fmt.Errorf("%s is not allowed an allowed merge style for this repository", repo_model.MergeStyle(form.Do)))
return
@ -854,6 +854,9 @@ func MergePullRequest(ctx *context.APIContext) {
} else if git.IsErrPushOutOfDate(err) {
ctx.Error(http.StatusConflict, "Merge", "merge push out of date")
return
} else if models.IsErrSHADoesNotMatch(err) {
ctx.Error(http.StatusConflict, "Merge", "head out of date")
return
} else if git.IsErrPushRejected(err) {
errPushRej := err.(*git.ErrPushRejected)
if len(errPushRej.Message) == 0 {

7
routers/web/repo/pull.go
View file

@ -933,7 +933,7 @@ func MergePullRequest(ctx *context.Context) {
return
}
if err = pull_service.Merge(pr, ctx.User, ctx.Repo.GitRepo, repo_model.MergeStyle(form.Do), message); err != nil {
if err = pull_service.Merge(pr, ctx.User, ctx.Repo.GitRepo, repo_model.MergeStyle(form.Do), form.HeadCommitID, message); err != nil {
if models.IsErrInvalidMergeStyle(err) {
ctx.Flash.Error(ctx.Tr("repo.pulls.invalid_merge_option"))
ctx.Redirect(issue.Link())
@ -976,6 +976,11 @@ func MergePullRequest(ctx *context.Context) {
ctx.Flash.Error(ctx.Tr("repo.pulls.merge_out_of_date"))
ctx.Redirect(issue.Link())
return
} else if models.IsErrSHADoesNotMatch(err) {
log.Debug("MergeHeadOutOfDate error: %v", err)
ctx.Flash.Error(ctx.Tr("repo.pulls.head_out_of_date"))
ctx.Redirect(issue.Link())
return
} else if git.IsErrPushRejected(err) {
log.Debug("MergePushRejected error: %v", err)
pushrejErr := err.(*git.ErrPushRejected)

1
services/forms/repo_form.go
View file

@ -571,6 +571,7 @@ type MergePullRequestForm struct {
MergeTitleField string
MergeMessageField string
MergeCommitID string // only used for manually-merged
HeadCommitID string `json:"head_commit_id,omitempty"`
ForceMerge *bool `json:"force_merge,omitempty"`
DeleteBranchAfterMerge bool `json:"delete_branch_after_merge,omitempty"`
}

20
services/pull/merge.go
View file

@ -34,7 +34,7 @@ import (
// Merge merges pull request to base repository.
// Caller should check PR is ready to be merged (review and status checks)
// FIXME: add repoWorkingPull make sure two merges does not happen at same time.
func Merge(pr *models.PullRequest, doer *user_model.User, baseGitRepo *git.Repository, mergeStyle repo_model.MergeStyle, message string) (err error) {
func Merge(pr *models.PullRequest, doer *user_model.User, baseGitRepo *git.Repository, mergeStyle repo_model.MergeStyle, expectedHeadCommitID, message string) (err error) {
if err = pr.LoadHeadRepo(); err != nil {
log.Error("LoadHeadRepo: %v", err)
return fmt.Errorf("LoadHeadRepo: %v", err)
@ -59,7 +59,7 @@ func Merge(pr *models.PullRequest, doer *user_model.User, baseGitRepo *git.Repos
go AddTestPullRequestTask(doer, pr.BaseRepo.ID, pr.BaseBranch, false, "", "")
}()
pr.MergedCommitID, err = rawMerge(pr, doer, mergeStyle, message)
pr.MergedCommitID, err = rawMerge(pr, doer, mergeStyle, expectedHeadCommitID, message)
if err != nil {
return err
}
@ -114,7 +114,7 @@ func Merge(pr *models.PullRequest, doer *user_model.User, baseGitRepo *git.Repos
}
// rawMerge perform the merge operation without changing any pull information in database
func rawMerge(pr *models.PullRequest, doer *user_model.User, mergeStyle repo_model.MergeStyle, message string) (string, error) {
func rawMerge(pr *models.PullRequest, doer *user_model.User, mergeStyle repo_model.MergeStyle, expectedHeadCommitID, message string) (string, error) {
err := git.LoadGitVersion()
if err != nil {
log.Error("git.LoadGitVersion: %v", err)
@ -137,6 +137,20 @@ func rawMerge(pr *models.PullRequest, doer *user_model.User, mergeStyle repo_mod
trackingBranch := "tracking"
stagingBranch := "staging"
if expectedHeadCommitID != "" {
trackingCommitID, err := git.NewCommand("show-ref", "--hash", git.BranchPrefix+trackingBranch).RunInDir(tmpBasePath)
if err != nil {
log.Error("show-ref[%s] --hash refs/heads/trackingn: %v", tmpBasePath, git.BranchPrefix+trackingBranch, err)
return "", fmt.Errorf("getDiffTree: %v", err)
}
if strings.TrimSpace(trackingCommitID) != expectedHeadCommitID {
return "", models.ErrSHADoesNotMatch{
GivenSHA: expectedHeadCommitID,
CurrentSHA: trackingCommitID,
}
}
}
var outbuf, errbuf strings.Builder
// Enable sparse-checkout

2
services/pull/update.go
View file

@ -55,7 +55,7 @@ func Update(pull *models.PullRequest, doer *user_model.User, message string, reb
return fmt.Errorf("HeadBranch of PR %d is up to date", pull.Index)
}
_, err = rawMerge(pr, doer, style, message)
_, err = rawMerge(pr, doer, style, "", message)
defer func() {
if rebase {

5
templates/repo/issue/view_content/pull.tmpl
View file

@ -327,6 +327,7 @@
<div class="ui form merge-fields" style="display: none">
<form action="{{.Link}}/merge" method="post">
{{.CsrfTokenHtml}}
<input type="hidden" name="head_commit_id" value="{{.PullHeadCommitID}}">
<div class="field">
<input type="text" name="merge_title_field" value="{{.Issue.PullRequest.GetDefaultMergeMessage}}">
</div>
@ -352,6 +353,7 @@
<div class="ui form rebase-fields" style="display: none">
<form action="{{.Link}}/merge" method="post">
{{.CsrfTokenHtml}}
<input type="hidden" name="head_commit_id" value="{{.PullHeadCommitID}}">
<button class="ui green button" type="submit" name="do" value="rebase">
{{$.i18n.Tr "repo.pulls.rebase_merge_pull_request"}}
</button>
@ -371,6 +373,7 @@
<div class="ui form rebase-merge-fields" style="display: none">
<form action="{{.Link}}/merge" method="post">
{{.CsrfTokenHtml}}
<input type="hidden" name="head_commit_id" value="{{.PullHeadCommitID}}">
<div class="field">
<input type="text" name="merge_title_field" value="{{.Issue.PullRequest.GetDefaultMergeMessage}}">
</div>
@ -396,6 +399,7 @@
<div class="ui form squash-fields" style="display: none">
<form action="{{.Link}}/merge" method="post">
{{.CsrfTokenHtml}}
<input type="hidden" name="head_commit_id" value="{{.PullHeadCommitID}}">
<div class="field">
<input type="text" name="merge_title_field" value="{{.Issue.PullRequest.GetDefaultSquashMessage}}">
</div>
@ -421,6 +425,7 @@
<div class="ui form manually-merged-fields" style="display: none">
<form action="{{.Link}}/merge" method="post">
{{.CsrfTokenHtml}}
<input type="hidden" name="head_commit_id" value="{{.PullHeadCommitID}}">
<div class="field">
<input type="text" name="merge_commit_id" placeholder="{{$.i18n.Tr "repo.pulls.merge_commit_id"}}">
</div>

4
templates/swagger/v1_json.tmpl
View file

@ -15674,6 +15674,10 @@
"force_merge": {
"type": "boolean",
"x-go-name": "ForceMerge"
},
"head_commit_id": {
"type": "string",
"x-go-name": "HeadCommitID"
}
},
"x-go-name": "MergePullRequestForm",