Go 1.18 and up now provides a strings.Cut() which is better suited for
splitting key/value pairs (and similar constructs), and performs better:
```go
func BenchmarkSplit(b *testing.B) {
b.ReportAllocs()
data := []string{"12hello=world", "12hello=", "12=hello", "12hello"}
for i := 0; i < b.N; i++ {
for _, s := range data {
_ = strings.SplitN(s, "=", 2)[0]
}
}
}
func BenchmarkCut(b *testing.B) {
b.ReportAllocs()
data := []string{"12hello=world", "12hello=", "12=hello", "12hello"}
for i := 0; i < b.N; i++ {
for _, s := range data {
_, _, _ = strings.Cut(s, "=")
}
}
}
```
BenchmarkSplit
BenchmarkSplit-10 8244206 128.0 ns/op 128 B/op 4 allocs/op
BenchmarkCut
BenchmarkCut-10 54411998 21.80 ns/op 0 B/op 0 allocs/op
While looking at occurrences of `strings.Split()`, I also updated some for alternatives,
or added some constraints;
- for cases where an specific number of items is expected, I used `strings.SplitN()`
with a suitable limit. This prevents (theoretical) unlimited splits.
- in some cases it we were using `strings.Split()`, but _actually_ were trying to match
a prefix; for those I replaced the code to just match (and/or strip) the prefix.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Without this, the log message for the user indicates a problem with the
yaml file, so identifying the actual error is hard. This change fixes
the output so that the incorrect environment variable is easy to spot.
Fixes#3653
Signed-off-by: James Hewitt <james.hewitt@uk.ibm.com>
If you set an env var with non-yaml content but accidentally collides with a possible configuration env var,...
The current error is
```configuration error: error parsing /etc/docker/registry/config.yml: yaml: unmarshal errors:
line 1: cannot unmarshal !!str `tcp://1...` into configuration.Parameters```
With this change we can see at least which is the problematic env var.
Some orchestrators such as docker-compose set env vars on top on user env vars, so debugging can be tricky if you are not passing vars, and the error is pointing you to a problably valid config file.
Signed-off-by: Rober Morales-Chaparro <rober@rstor.io>
Signed-off-by: Rober Morales-Chaparro <rober.morales@ebury.com>
If the overwriteStruct() finds an uninitialized pointer, it tries to initialize it,
but does it incorrectly. It tries to assign a pointer to pointer, instead of pointer.
Signed-off-by: Gladkov Alexey <agladkov@redhat.com>
Overriding configuration parameters with environment variables used to
work by walking the configuration structure and checking for a
corresponding environment variable for each item. This was very limiting
because only variables corresponding to items that already existed in
the configuration structure would be checked. For example, an
environment variable corresponding to nested maps would only be noticed
if the outer map's key already existed.
This commit changes environment variable overriding to iterate over the
environment instead. For environment variables beginning with the
REGISTRY_ prefix, it splits the rest of their names on "_", and
interprets that as a path to the variable to unmarshal into. Map keys
are created as necessary. If we encounter an empty interface partway
through following the path, it becomes an implicit
map[string]interface{}.
With the new unit tests added here, parser.go now has 89.2% test
coverage.
TestParseWithExtraneousEnvStorageParams was removed, because the limit
of one storage driver is no longer enforced while parsing environment
variables. Now, Storage.Type will panic if multiple drivers are
specified.
Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
