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create: improve interface when attempting to create docker driver

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Previously, the help information for buildx indicated that users could
create a new instance of the docker driver - which is explicitly
something we don't support, driver of this form are automatically
derived from the available list of docker contexts.

This patch ensures that don't have AllowsInstance set will not appear in
the help text, and additionally provide a new more specific error
message instead of the generic "failed to find driver". This should help
point users in the correct direction.

Signed-off-by: Justin Chadwell <me@jedevc.com>
This commit is contained in:
Justin Chadwell
2022-08-16 10:58:23 +01:00
parent fb5e1393a4
commit 17d4369866
4 changed files with 17 additions and 13 deletions
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17
driver/manager.go
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@ -92,16 +92,16 @@ func GetDefaultFactory(ctx context.Context, ep string, c dockerclient.APIClient,
return dd[0].f, nil
}
func GetFactory(name string, instanceRequired bool) Factory {
func GetFactory(name string, instanceRequired bool) (Factory, error) {
for _, f := range drivers {
if instanceRequired && !f.AllowsInstances() {
continue
}
if f.Name() == name {
return f
if instanceRequired && !f.AllowsInstances() {
return nil, errors.Errorf("additional instances of driver %q cannot be created", name)
}
return f, nil
}
}
return nil
return nil, errors.Errorf("failed to find driver %q", name)
}
func GetDriver(ctx context.Context, name string, f Factory, endpointAddr string, api dockerclient.APIClient, auth Auth, kcc KubeClientConfig, flags []string, files map[string][]byte, do map[string]string, platforms []specs.Platform, contextPathHash string) (Driver, error) {
@ -131,9 +131,12 @@ func GetDriver(ctx context.Context, name string, f Factory, endpointAddr string,
return &cachedDriver{Driver: d}, nil
}
func GetFactories() []Factory {
func GetFactories(instanceRequired bool) []Factory {
ds := make([]Factory, 0, len(drivers))
for _, d := range drivers {
if instanceRequired && !d.AllowsInstances() {
continue
}
ds = append(ds, d)
}
sort.Slice(ds, func(i, j int) bool {