英文:
Go "Permission Denied" when trying to create a new backup config file inside /etc
问题
我正在使用功能来保存配置文件的备份的API。以下是您要翻译的代码部分：
func (s *saver) Save(path string, updated []byte) error {
backupContents, openErr := os.ReadFile(path)
if openErr == nil {
t := time.Now()
backupPath := path + "." + t.Format("2006-01-02") + ".bk"
err := os.WriteFile(backupPath, backupContents, 0777)
if err != nil {
return err
}
}
if openErr == nil || errors.Is(openErr, os.ErrNotExist) {
file, err := os.Create(path)
if err != nil {
return err
}
defer file.Close()
if _, err := file.Write(updated); err != nil { //update file
return err
}
} else if openErr != nil {
return openErr
}
return nil
}
然而，我遇到了错误open /etc/dhcpcd.conf.2022-03-24.bk: permission denied。
我可以成功地将文件写入/etc/dhcpcd.conf，因为我的API二进制文件以root权限运行，为什么在/etc中创建新文件会出现权限错误？我考虑过umask，但我认为这不是问题，我的默认umask是0022，但我将其设置为0000进行尝试，但仍然出现相同的权限错误。我还尝试将os.WriteFile替换为os.OpenFile（使用os.O_RDWR|os.O_CREATE标志）或os.Create，但仍然出现权限被拒绝的错误。
这是/etc文件夹的权限：
drwxr-xr-x 115 root root 4096 Mar 24 10:56
请帮忙看看，非常感谢~~
英文:
I am writing APIs with functionalities to save backups of config files inside /etc.
backupContents, openErr := os.ReadFile(path)
if openErr == nil {
t := time.Now()
backupPath := path + "." + t.Format("2006-01-02") + ".bk"
err := os.WriteFile(backupPath, backupContents, 0777)
if err != nil {
return err
}
}
if openErr == nil || errors.Is(openErr, os.ErrNotExist) {
file, err := os.Create(path)
if err != nil {
return err
}
defer file.Close()
if _, err := file.Write(updated); err != nil { //update file
return err
}
} else if openErr != nil {
return openErr
}
return nil
}
However, I get the error open /etc/dhcpcd.conf.2022-03-24.bk: permission denied"
I can write to /etc/dhcpcd.conf successfully in the same function as my API binaries run with root access, how come creating a new file in /etc has permission errors? I thought of umask though I think it is not the issue, my default umask was 0022 but I set it to 0000 instead to try, but got the same permission errors. I also tried to replace os.WriteFile with os.OpenFile (with os.O_RDWR|os.O_CREATE flags) or os.Create but get the same permission denied errors.
Here is the permission of the /etc folder:
drwxr-xr-x 115 root root 4096 Mar 24 10:56
Please help, thanks a lot~~
答案1
得分: 1
你可能是以非root用户身份运行脚本。
尝试以root用户或使用sudo运行脚本。
在/etc目录中创建/删除/编辑文件需要root权限。
英文:
you are probably running the script with a user that is not root user.
try running the script with root user or with sudo.
/etc dir requires root permissions for creating/removing/editing files
答案2
得分: 1
你需要 root 权限，在运行脚本之前使用 sudo 命令，或者在 bash 中使用 sudo su 获取 root 访问权限。
英文:
You need root permission, run with sudo before the command to run the script or sudo su in bash to get root access.
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