英文:
How can I get the error message into my Go program using Go's os/exec library?
问题
我正在运行执行"psql"的代码。它应该返回一些错误代码，因为数据库没有启动。
它应该返回以下内容：
psql: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/tmp/.s.PGSQL.5432"?
然而，它返回的是标准错误信息：
2013/11/21 15:06:19 exit status 2
exit status 1
以下是代码：
package main
import (
"fmt"
"log"
"os/exec"
)
func main() {
out, err := exec.Command("psql").Output()
if err != nil {
log.Fatal(err)
}
fmt.Printf("%s\n",out)
}
英文:
I am running code that executes "psql". It should return some error code, because the database is not up.
It should return
psql: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/tmp/.s.PGSQL.5432"?
However it returning the standard error of
2013/11/21 15:06:19 exit status 2
exit status 1
Here is the code
package main
import (
"fmt"
"log"
"os/exec"
)
func main() {
out, err := exec.Command("psql").Output()
if err != nil {
log.Fatal(err)
}
fmt.Printf("%s\n",out)
}
答案1
得分: 2
因为输出只返回来自STDOUT的数据，而psql错误是在STDERR流上打印该数据。
您需要读取STDERR：
func (c *Cmd) StderrPipe() (io.ReadCloser, error)
英文:
Because output only returns data from the STDOUT, while the psql error is printing that data on the STDERR stream
You need to read the STDERR:
func (c *Cmd) StderrPipe() (io.ReadCloser, error)
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