47 lines
1.0 KiB
Go
47 lines
1.0 KiB
Go
package main
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import (
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"bufio"
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"fmt"
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"io"
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"os"
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"strings"
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)
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// These are the environmental variables that determine if we log, and if
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// we log whether or not the log should go to a file.
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const EnvLog = "PACKER_LOG" //Set to True
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const EnvLogFile = "PACKER_LOG_PATH" //Set to a file
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// logOutput determines where we should send logs (if anywhere).
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func logOutput() (logOutput io.Writer, err error) {
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logOutput = nil
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if os.Getenv(EnvLog) != "" && os.Getenv(EnvLog) != "0" {
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logOutput = os.Stderr
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if logPath := os.Getenv(EnvLogFile); logPath != "" {
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var err error
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logOutput, err = os.Create(logPath)
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if err != nil {
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return nil, err
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}
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} else {
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// no path; do a little light filtering to avoid double-dipping UI
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// calls.
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r, w := io.Pipe()
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scanner := bufio.NewScanner(r)
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go func(scanner *bufio.Scanner) {
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for scanner.Scan() {
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if strings.Contains(scanner.Text(), "ui:") {
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continue
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}
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os.Stderr.WriteString(fmt.Sprint(scanner.Text() + "\n"))
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}
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}(scanner)
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logOutput = w
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}
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}
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return
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}
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