ioutil has been deprecated since go 1.16, this fixes all of the
deprecated functions we are using:
ioutil.ReadFile -> os.ReadFile
ioutil.ReadAll -> io.ReadAll
ioutil.WriteFile -> os.WriteFile
ioutil.TempFile -> os.CreateTemp
ioutil.TempDir -> os.MkdirTemp
All of the above are a simple name change, the function arguments and
results are exactly the same as before.
ioutil.ReadDir -> os.ReadDir
now returns a os.DirEntry but the IsDir and Name functions work the
same. The difference is that the FileInfo must be retrieved with the
Info() function which can also return an error.
These were identified by running:
golangci-lint run --build-tags=integration ./...
%#v was my bad understanding of Go's error formatting. Let's use the standard
%v that gives saner and human-readable error messages.
Signed-off-by: Ondřej Budai <ondrej@budai.cz>
More specifically only those that are needed in
/cmd/osbuild-image/tests.
This patch can be merged with the previous one if we want to make sure
every commit can be built, but I'm going to keep it like this for now so
that we can easily see the changes.
