os: os.Create & os.OpenFile both not creating .json file

[samjtro]

Go version

1.22.3

OS

Debian 12.0

Output of go env in your module/workspace:

GO111MODULE=''
GOARCH='amd64'
GOBIN=''
GOCACHE='/home/sam/.cache/go-build'
GOENV='/home/sam/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/home/sam/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/home/sam/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.22.3'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/home/sam/repos/github.com/samjtro/go-trade/go.mod'

What did you do?

Attempted to use os.Create to create a JSON file.

f, err := os.Create("~/.foo/bar.json")
utils.Check(err)

Also attempted to use os.OpenFile directly with the os.O_CREATE flag.

f, err := os.OpenFile("~/.foo/bar.json", os.O_CREATE, 0644) // I tried 0666, 0777 for this as well as the below implementation
utils.Check(err)

Also attempted to use os.WriteFile, another wrapper for os.OpenFile.

err = os.WriteFile("~/.foo/bar.json", tokensJson, 0777)
utils.Check(err)

What did you see happen?

I received the following error, and the file was not created.

2024/05/28 13:03:53 open ~/.foo/bar.json: no such file or directory

What did you expect to see?

Ideally, I would have expected to see no error and the file created.

[samjtro]

I attempted to trace this back, but the furthest I got before giving up was openFileNolog() in file_unix.go.

Not even sure this is correct though.

[j178]

Does the ~/.foo directory exist?

[samjtro]

~/.foo exists. I am utilizing it for loading in a config.env file earlier in the process, which works fine.

[samjtro]

I reproduced this in a separate project, receiving the same error when attempting to save directly to the home directory as well (I also changed ~ to $HOME, which resulted in the same error).

[neild]

Conversion of ~ or $HOME to the location of your home directory is performed by your shell.

The os package does not perform shell expansion, so os.Create("~/.foo/bar.json") is attempting to create a file in the directory with the literal name "~". This directory presumably does not exist.

[j178]

You need to expand ～ or $HOME before calling OpenFile.

[samjtro]

Thank you for catching my mistake! I knew I was doing something silly. Closing.