45 lines
1.1 KiB
Go
45 lines
1.1 KiB
Go
package envoy
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import (
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"errors"
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"os/exec"
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"regexp"
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)
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const (
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envoyVersionFlag = "--version"
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)
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// execCommand lets us mock out the exec.Command function
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var execCommand = exec.Command
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func execEnvoyVersion(binary string) (string, error) {
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cmd := execCommand(binary, envoyVersionFlag)
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output, err := cmd.Output()
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if err != nil {
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return "", err
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}
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version, err := parseEnvoyVersionNumber(string(output))
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if err != nil {
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return "", err
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}
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return version, nil
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}
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func parseEnvoyVersionNumber(fullVersion string) (string, error) {
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// Use a regular expression to match the major.minor.patch version string in the fullVersion
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// Example input:
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// `envoy version: 69958e4fe32da561376d8b1d367b5e6942dfba24/1.24.1/Distribution/RELEASE/BoringSSL`
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re := regexp.MustCompile(`(\d+\.\d+\.\d+)`)
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matches := re.FindStringSubmatch(fullVersion)
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// If no matches were found, return an error
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if len(matches) == 0 {
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return "", errors.New("unable to parse Envoy version from output")
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}
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// Return the first match (the major.minor.patch version string)
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return matches[0], nil
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}
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