[stable15] Use a tmp file for swift writes

[backportbot-nextcloud]

backport of #14424

[MorrisJobke]

Code makes sense 👍

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 16829: failure

TESTS=acceptance, TESTS-ACCEPTANCE=app-comments

• tests/acceptance/features/app-comments.feature:10

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 Scenario: open the comments for a different file # /drone/src/github.com/nextcloud/server/tests/acceptance/features/app-comments.feature:10
Given I am logged in # LoginPageContext::iAmLoggedIn()
And I create a new folder named "Folder" # FileListContext::iCreateANewFolderNamed()
And I open the details view for "welcome.txt" # FileListContext::iOpenTheDetailsViewFor()
And I open the "Comments" tab in the details view # FilesAppContext::iOpenTheTabInTheDetailsView()
And I create a new comment with "Hello world" as message # CommentsAppContext::iCreateANewCommentWithAsMessage()
And I see a comment with "Hello world" as message # CommentsAppContext::iSeeACommentWithAsMessage()
Comment with text "Hello world" in details view in Files app could not be found after 100 seconds (NoSuchElementException)
When I open the details view for "Folder" # FileListContext::iOpenTheDetailsViewFor()
Then I see that there are no comments # CommentsAppContext::iSeeThatThereAreNoComments()

TESTS=acceptance, TESTS-ACCEPTANCE=app-files

• tests/acceptance/features/app-files.feature:126
• tests/acceptance/features/app-files.feature:133
• tests/acceptance/features/app-files.feature:206

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 Scenario: show deleted files # /drone/src/github.com/nextcloud/server/tests/acceptance/features/app-files.feature:126
Given I am logged in # LoginPageContext::iAmLoggedIn()
And I delete "welcome.txt" # FileListContext::iDelete()
When I open the "Deleted files" section # AppNavigationContext::iOpenTheSection()
Then I see that the current section is "Deleted files" # AppNavigationContext::iSeeThatTheCurrentSectionIs()
Then I see that the file list contains a file named "welcome.txt" # FileListContext::iSeeThatTheFileListContainsAFileNamed()
Row for file welcome.txt in file list could not be found after 100 seconds (NoSuchElementException)
Scenario: show deleted files for a second time # /drone/src/github.com/nextcloud/server/tests/acceptance/features/app-files.feature:133
Given I am logged in # LoginPageContext::iAmLoggedIn()
And I open the "Deleted files" section # AppNavigationContext::iOpenTheSection()
And I see that the current section is "Deleted files" # AppNavigationContext::iSeeThatTheCurrentSectionIs()
And I open the "All files" section # AppNavigationContext::iOpenTheSection()
And I see that the current section is "All files" # AppNavigationContext::iSeeThatTheCurrentSectionIs()
And I delete "welcome.txt" # FileListContext::iDelete()
When I open the "Deleted files" section # AppNavigationContext::iOpenTheSection()
Then I see that the current section is "Deleted files" # AppNavigationContext::iSeeThatTheCurrentSectionIs()
Then I see that the file list contains a file named "welcome.txt" # FileListContext::iSeeThatTheFileListContainsAFileNamed()
Row for file welcome.txt in file list could not be found after 100 seconds (NoSuchElementException)
Scenario: rename a file with the details view open # /drone/src/github.com/nextcloud/server/tests/acceptance/features/app-files.feature:206
Given I am logged in # LoginPageContext::iAmLoggedIn()
And I open the details view for "welcome.txt" # FileListContext::iOpenTheDetailsViewFor()
When I rename "welcome.txt" to "farewell.txt" # FileListContext::iRenameTo()
Then I see that the file list contains a file named "farewell.txt" # FileListContext::iSeeThatTheFileListContainsAFileNamed()
Row for file farewell.txt in file list could not be found after 100 seconds (NoSuchElementException)
And I see that the file name shown in the details view is "farewell.txt" # FilesAppContext::iSeeThatTheFileNameShownInTheDetailsViewIs()

TESTS=acceptance, TESTS-ACCEPTANCE=app-files-sharing

• cancelled - typically means that the tests took longer than the drone CI allows them to run

TESTS=acceptance, TESTS-ACCEPTANCE=login

• tests/acceptance/features/login.feature:15

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 Scenario: log in with valid user and invalid password once fixed by admin # /drone/src/github.com/nextcloud/server/tests/acceptance/features/login.feature:15
Given I act as John # ActorContext::iActAs()
And I can not log in with user user0 and password 654231 # LoginPageContext::iCanNotLogInWithUserAndPassword()
When I act as Jane # ActorContext::iActAs()
And I am logged in as the admin # LoginPageContext::iAmLoggedInAsTheAdmin()
And I open the User settings # SettingsMenuContext::iOpenTheUserSettings()
And I set the password for user0 to 654321 # UsersSettingsContext::iSetTheFieldForUserTo()
And I act as John # ActorContext::iActAs()
And I log in with user user0 and password 654321 # LoginPageContext::iLogInWithUserAndPassword()
Then I see that the current page is the Files app # FilesAppContext::iSeeThatTheCurrentPageIsTheFilesApp()
Failed asserting that 'http://acceptance-login/index.php/login?user=user0' starts with "http://acceptance-login/index.php/apps/files/".

TESTS=acceptance, TESTS-ACCEPTANCE=users

• cancelled - typically means that the tests took longer than the drone CI allows them to run

[mzamot]

With the latest commit in stable15 I still get a similar error: "Unable to seek to stream position 0 with whence 0" in files bigger than 10mb.