mirror of https://github.com/kubernetes/kops.git
36 lines
1.4 KiB
Go
36 lines
1.4 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package exec
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import "strings"
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// WithTee returns the command to run the command while piping output to both the log file and stdout/stderr
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func WithTee(cmd string, args []string, logfile string) []string {
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// exec so we don't have a shell that doesn't pass signals to the real process
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execCmd := "exec " + cmd + " " + strings.Join(args, " ")
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// NOTE: tee & mkfifo is in /usr/bin in the kube-proxy image, but /bin in other images
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// Bash supports something like this, but dash and other limited shells don't
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// shCmd := "exec &> >(/usr/bin/tee -a " + logfile + "); " + execCmd
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// Instead we create the pipe manually and wire up the tee:
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shCmd := "mkfifo /tmp/pipe; (tee -a " + logfile + " < /tmp/pipe & ) ; " + execCmd + " > /tmp/pipe 2>&1"
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// Execute shell command
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return []string{"/bin/sh", "-c", shCmd}
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}
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