ebcb7d6b40
Use strongly typed errors to set HTTP status codes. Error interfaces are defined in the api/errors package and errors returned from controllers are checked against these interfaces. Errors can be wraeped in a pkg/errors.Causer, as long as somewhere in the line of causes one of the interfaces is implemented. The special error interfaces take precedence over Causer, meaning if both Causer and one of the new error interfaces are implemented, the Causer is not traversed. Signed-off-by: Brian Goff <cpuguy83@gmail.com>
48 lines
1.1 KiB
Go
48 lines
1.1 KiB
Go
package opts
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import (
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"fmt"
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"os"
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"runtime"
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"strings"
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"github.com/pkg/errors"
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)
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// ValidateEnv validates an environment variable and returns it.
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// If no value is specified, it returns the current value using os.Getenv.
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//
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// As on ParseEnvFile and related to #16585, environment variable names
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// are not validate what so ever, it's up to application inside docker
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// to validate them or not.
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//
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// The only validation here is to check if name is empty, per #25099
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func ValidateEnv(val string) (string, error) {
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arr := strings.Split(val, "=")
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if arr[0] == "" {
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return "", errors.Errorf("invalid environment variable: %s", val)
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}
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if len(arr) > 1 {
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return val, nil
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}
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if !doesEnvExist(val) {
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return val, nil
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}
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return fmt.Sprintf("%s=%s", val, os.Getenv(val)), nil
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}
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func doesEnvExist(name string) bool {
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for _, entry := range os.Environ() {
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parts := strings.SplitN(entry, "=", 2)
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if runtime.GOOS == "windows" {
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// Environment variable are case-insensitive on Windows. PaTh, path and PATH are equivalent.
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if strings.EqualFold(parts[0], name) {
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return true
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}
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}
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if parts[0] == name {
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return true
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}
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}
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return false
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}
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