65 lines
1.6 KiB
Go
65 lines
1.6 KiB
Go
package cli
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import (
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"bytes"
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"io"
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"os"
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)
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// RunWithArgs executes the given command with the specified command line args
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// and environmental variables set. It returns any error returned from cmd.Execute()
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func RunWithArgs(cmd Executable, args []string, env map[string]string) error {
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oargs := os.Args
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oenv := map[string]string{}
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// defer returns the environment back to normal
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defer func() {
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os.Args = oargs
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for k, v := range oenv {
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os.Setenv(k, v)
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}
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}()
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// set the args and env how we want them
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os.Args = args
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for k, v := range env {
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// backup old value if there, to restore at end
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oenv[k] = os.Getenv(k)
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err := os.Setenv(k, v)
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if err != nil {
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return err
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}
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}
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// and finally run the command
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return cmd.Execute()
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}
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// RunCaptureWithArgs executes the given command with the specified command line args
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// and environmental variables set. It returns whatever was writen to
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// stdout along with any error returned from cmd.Execute()
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func RunCaptureWithArgs(cmd Executable, args []string, env map[string]string) (output string, err error) {
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old := os.Stdout // keep backup of the real stdout
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r, w, _ := os.Pipe()
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os.Stdout = w
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defer func() {
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os.Stdout = old // restoring the real stdout
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}()
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outC := make(chan string)
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// copy the output in a separate goroutine so printing can't block indefinitely
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go func() {
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var buf bytes.Buffer
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// io.Copy will end when we call w.Close() below
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io.Copy(&buf, r)
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outC <- buf.String()
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}()
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// now run the command
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err = RunWithArgs(cmd, args, env)
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// and grab the stdout to return
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w.Close()
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output = <-outC
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return output, err
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}
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