Allow setting the delimiter used for setting config via OS env, e.g. HUGO_

Fixes #7829
This commit is contained in:
Bjørn Erik Pedersen 2020-11-24 14:11:42 +01:00
parent 8a6e706053
commit 7e223b3baa
4 changed files with 53 additions and 24 deletions

View file

@ -84,7 +84,7 @@ func GetNestedParam(keyStr, separator string, candidates ...Params) (interface{}
}
func GetNestedParamFn(keyStr, separator string, lookupFn func(key string) interface{}) (interface{}, string, map[string]interface{}, error) {
keySegments := strings.Split(strings.ToLower(keyStr), separator)
keySegments := strings.Split(keyStr, separator)
if len(keySegments) == 0 {
return nil, "", nil, nil
}

View file

@ -427,6 +427,8 @@ Names must be prefixed with `HUGO_` and the configuration key must be set in upp
To set config params, prefix the name with `HUGO_PARAMS_`
{{% /note %}}
{{< new-in "0.79.0" >}} If you are using snake_cased variable names, the above will not work, so since Hugo 0.79.0 Hugo determines the delimiter to use by the first character after `HUGO`. This allows you to define environment variables on the form `HUGOxPARAMSxAPI_KEY=abcdefgh`, using any [allowed](https://stackoverflow.com/questions/2821043/allowed-characters-in-linux-environment-variable-names#:~:text=So%20names%20may%20contain%20any,not%20begin%20with%20a%20digit.) delimiter.
{{< todo >}}
Test and document setting params via JSON env var.
{{< /todo >}}

View file

@ -18,6 +18,8 @@ import (
"path/filepath"
"strings"
"github.com/gohugoio/hugo/common/types"
"github.com/gobwas/glob"
hglob "github.com/gohugoio/hugo/hugofs/glob"
@ -166,45 +168,59 @@ func LoadConfig(d ConfigSourceDescriptor, doWithConfig ...func(cfg config.Provid
}
}
const delim = "__env__delim"
// Apply environment overrides
if len(d.Environ) > 0 {
// Extract all that start with the HUGO_ prefix
const hugoEnvPrefix = "HUGO_"
var hugoEnv []string
// Extract all that start with the HUGO prefix.
// The delimiter is the following rune, usually "_".
const hugoEnvPrefix = "HUGO"
var hugoEnv []types.KeyValueStr
for _, v := range d.Environ {
key, val := config.SplitEnvVar(v)
if strings.HasPrefix(key, hugoEnvPrefix) {
hugoEnv = append(hugoEnv, strings.ToLower(strings.TrimPrefix(key, hugoEnvPrefix)), val)
delimiterAndKey := strings.TrimPrefix(key, hugoEnvPrefix)
if len(delimiterAndKey) < 2 {
continue
}
// Allow delimiters to be case sensitive.
// It turns out there isn't that many allowed special
// chars in environment variables when used in Bash and similar,
// so variables on the form HUGOxPARAMSxFOO=bar is one option.
key := strings.ReplaceAll(delimiterAndKey[1:], delimiterAndKey[:1], delim)
key = strings.ToLower(key)
hugoEnv = append(hugoEnv, types.KeyValueStr{
Key: key,
Value: val,
})
}
}
if len(hugoEnv) > 0 {
for i := 0; i < len(hugoEnv); i += 2 {
key, valStr := strings.ToLower(hugoEnv[i]), hugoEnv[i+1]
for _, env := range hugoEnv {
existing, nestedKey, owner, err := maps.GetNestedParamFn(env.Key, delim, v.Get)
if err != nil {
return v, configFiles, err
}
existing, nestedKey, owner, err := maps.GetNestedParamFn(key, "_", v.Get)
if existing != nil {
val, err := metadecoders.Default.UnmarshalStringTo(env.Value, existing)
if err != nil {
return v, configFiles, err
continue
}
if existing != nil {
val, err := metadecoders.Default.UnmarshalStringTo(valStr, existing)
if err != nil {
continue
}
if owner != nil {
owner[nestedKey] = val
} else {
v.Set(key, val)
}
} else if nestedKey != "" {
owner[nestedKey] = valStr
if owner != nil {
owner[nestedKey] = val
} else {
v.Set(key, valStr)
v.Set(env.Key, val)
}
} else if nestedKey != "" {
owner[nestedKey] = env.Value
} else {
v.Set(env.Key, env.Value)
}
}
}
// We made this a Glob pattern in Hugo 0.75, we don't need both.

View file

@ -492,6 +492,11 @@ intSlice = [5,7,9]
floatSlice = [3.14, 5.19]
stringSlice = ["a", "b"]
[params]
[params.api_config]
api_key="default_key"
another_key="default another_key"
[imaging]
anchor = "smart"
quality = 75
@ -508,6 +513,10 @@ quality = 75
"HUGO_STRINGSLICE", `["c", "d"]`,
"HUGO_INTSLICE", `[5, 8, 9]`,
"HUGO_FLOATSLICE", `[5.32]`,
// https://github.com/gohugoio/hugo/issues/7829
"HUGOxPARAMSxAPI_CONFIGxAPI_KEY", "new_key",
// Delimiters are case sensitive.
"HUGOxPARAMSxAPI_CONFIGXANOTHER_KEY", "another_key",
)
b.Build(BuildCfg{})
@ -523,5 +532,7 @@ quality = 75
c.Assert(cfg.Get("stringSlice"), qt.DeepEquals, []interface{}{"c", "d"})
c.Assert(cfg.Get("floatSlice"), qt.DeepEquals, []interface{}{5.32})
c.Assert(cfg.Get("intSlice"), qt.DeepEquals, []interface{}{5, 8, 9})
c.Assert(cfg.Get("params.api_config.api_key"), qt.Equals, "new_key")
c.Assert(cfg.Get("params.api_config.another_key"), qt.Equals, "default another_key")
}