54 lines
1.8 KiB
Go
54 lines
1.8 KiB
Go
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package googlecompute
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import (
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"encoding/base64"
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"fmt"
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)
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const StartupScriptStartLog string = "Packer startup script starting."
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const StartupScriptDoneLog string = "Packer startup script done."
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const StartupScriptKey string = "startup-script"
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const StartupWrappedScriptKey string = "packer-wrapped-startup-script"
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// We have to encode StartupScriptDoneLog because we use it as a sentinel value to indicate
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// that the user-provided startup script is done. If we pass StartupScriptDoneLog as-is, it
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// will be printed early in the instance console log (before the startup script even runs;
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// we print out instance creation metadata which contains this wrapper script).
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var StartupScriptDoneLogBase64 string = base64.StdEncoding.EncodeToString([]byte(StartupScriptDoneLog))
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var StartupScript string = fmt.Sprintf(`#!/bin/bash
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echo %s
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RETVAL=0
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GetMetadata () {
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echo "$(curl -f -H "Metadata-Flavor: Google" http://metadata/computeMetadata/v1/instance/attributes/$1 2> /dev/null)"
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}
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STARTUPSCRIPT=$(GetMetadata %s)
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STARTUPSCRIPTPATH=/packer-wrapped-startup-script
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if [ -f "/var/log/startupscript.log" ]; then
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STARTUPSCRIPTLOGPATH=/var/log/startupscript.log
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else
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STARTUPSCRIPTLOGPATH=/var/log/daemon.log
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fi
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STARTUPSCRIPTLOGDEST=$(GetMetadata startup-script-log-dest)
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if [[ ! -z $STARTUPSCRIPT ]]; then
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echo "Executing user-provided startup script..."
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echo "${STARTUPSCRIPT}" > ${STARTUPSCRIPTPATH}
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chmod +x ${STARTUPSCRIPTPATH}
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${STARTUPSCRIPTPATH}
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RETVAL=$?
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if [[ ! -z $STARTUPSCRIPTLOGDEST ]]; then
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echo "Uploading user-provided startup script log to ${STARTUPSCRIPTLOGDEST}..."
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gsutil -h "Content-Type:text/plain" cp ${STARTUPSCRIPTLOGPATH} ${STARTUPSCRIPTLOGDEST}
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fi
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rm ${STARTUPSCRIPTPATH}
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fi
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echo $(echo %s | base64 --decode)
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exit $RETVAL
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`, StartupScriptStartLog, StartupWrappedScriptKey, StartupScriptDoneLogBase64)
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