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package opts
import (
"fmt"
"os"
"strconv"
"strings"
"github.com/docker/docker/api/types/container"
)
// ReadKVStrings reads a file of line terminated key=value pairs, and overrides any keys
// present in the file with additional pairs specified in the override parameter
func ReadKVStrings(files []string, override []string) ([]string, error) {
return readKVStrings(files, override, nil)
}
// ReadKVEnvStrings reads a file of line terminated key=value pairs, and overrides any keys
// present in the file with additional pairs specified in the override parameter.
// If a key has no value, it will get the value from the environment.
func ReadKVEnvStrings(files []string, override []string) ([]string, error) {
return readKVStrings(files, override, os.LookupEnv)
}
func readKVStrings(files []string, override []string, emptyFn func(string) (string, bool)) ([]string, error) {
var variables []string
for _, ef := range files {
parsedVars, err := parseKeyValueFile(ef, emptyFn)
if err != nil {
return nil, err
}
variables = append(variables, parsedVars...)
}
// parse the '-e' and '--env' after, to allow override
variables = append(variables, override...)
return variables, nil
}
// ConvertKVStringsToMap converts ["key=value"] to {"key":"value"}
func ConvertKVStringsToMap(values []string) map[string]string {
result := make(map[string]string, len(values))
for _, value := range values {
k, v, _ := strings.Cut(value, "=")
result[k] = v
}
return result
}
// ConvertKVStringsToMapWithNil converts ["key=value"] to {"key":"value"}
// but set unset keys to nil - meaning the ones with no "=" in them.
// We use this in cases where we need to distinguish between
//
// FOO= and FOO
//
// where the latter case just means FOO was mentioned but not given a value
func ConvertKVStringsToMapWithNil(values []string) map[string]*string {
result := make(map[string]*string, len(values))
for _, value := range values {
k, v, ok := strings.Cut(value, "=")
if !ok {
result[k] = nil
} else {
result[k] = &v
}
}
return result
}
// ParseRestartPolicy returns the parsed policy or an error indicating what is incorrect
func ParseRestartPolicy(policy string) (container.RestartPolicy, error) {
if policy == "" {
// for backward-compatibility, we don't set the default ("no")
// policy here, because older versions of the engine may not
// support it.
return container.RestartPolicy{}, nil
}
p := container.RestartPolicy{}
k, v, ok := strings.Cut(policy, ":")
if ok && k == "" {
return container.RestartPolicy{}, fmt.Errorf("invalid restart policy format: no policy provided before colon")
}
if v != "" {
count, err := strconv.Atoi(v)
if err != nil {
return container.RestartPolicy{}, fmt.Errorf("invalid restart policy format: maximum retry count must be an integer")
}
p.MaximumRetryCount = count
}
p.Name = container.RestartPolicyMode(k)
return p, nil
}
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