英文:
Which combination of os.FileMode's corresponds to `a` in fopen, with respect to the permissions on the created file?
问题
考虑以下在Golang中的简短程序，它尝试写入一个文件。
package main
import "io/ioutil"
import "os"
func main() {
ioutil.WriteFile("/tmp/FooBar", []byte("Hello World"), os.ModeAppend)
}
运行该程序后，我得到了一个具有以下权限的文件。
---------- 1 merlin sudo 5 Oct 12 15:02 /tmp/FooBar
这些权限基本上是无法使用的。
如果我运行等效的C程序。
#include <stdio.h>
int main(){
FILE* foo = fopen("/tmp/BarFoo", "a");
fprintf(foo, "Hello World");
fclose(foo);
}
那么我得到的文件看起来像这样，这更加理想。
-rw-r--r-- 1 merlin sudo 11 Oct 12 15:10 /tmp/BarFoo
在Golang程序中，正确的标志组合是什么，以产生与C程序相同权限的文件？
我查看了FileMode文档，但没有找到合适的候选项。
英文:
Consider the following short program in Golang, which simply attempts to write a file.
package main
import "io/ioutil"
import "os"
func main() {
ioutil.WriteFile("/tmp/FooBar", []byte("Hello World"), os.ModeAppend)
}
After running this program, I get a file with the following permissions.
---------- 1 merlin sudo 5 Oct 12 15:02 /tmp/FooBar
The permissions are essentially unuseable.
If I run the equivalent C program.
#include <stdio.h>
int main(){
FILE* foo = fopen("/tmp/BarFoo", "a");
fprintf(foo, "Hello World");
fclose(foo);
}
Then I get a file that looks like this, which is much more desirable.
-rw-r--r-- 1 merlin sudo 11 Oct 12 15:10 /tmp/BarFoo
What is the correct combination of flags in the Golang program to produce a file with the same permissions as the C program?
I have looked at the FileMode documentation but did not see any good candidates.
答案1
得分: 4
FileMode包括了新创建文件的权限位，因此你需要提供这些权限位：
ioutil.WriteFile("/tmp/FooBar", []byte("Hello World"), os.ModeAppend | 0644)
英文:
As FileMode includes permission bits for newly-created files, you’ll need to provide those:
ioutil.WriteFile("/tmp/FooBar", []byte("Hello World"), os.ModeAppend | 0644)
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