mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-05 06:30:41 +01:00
57dc742c76
Bumps [github.com/KimMachineGun/automemlimit](https://github.com/KimMachineGun/automemlimit) from 0.2.4 to 0.2.5. - [Release notes](https://github.com/KimMachineGun/automemlimit/releases) - [Commits](https://github.com/KimMachineGun/automemlimit/compare/v0.2.4...v0.2.5) --- updated-dependencies: - dependency-name: github.com/KimMachineGun/automemlimit dependency-type: direct:production update-type: version-update:semver-patch ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
101 lines
2.5 KiB
Go
101 lines
2.5 KiB
Go
package internal
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"sync"
|
|
)
|
|
|
|
// ErrNotSupported indicates that a feature is not supported by the current kernel.
|
|
var ErrNotSupported = errors.New("not supported")
|
|
|
|
// UnsupportedFeatureError is returned by FeatureTest() functions.
|
|
type UnsupportedFeatureError struct {
|
|
// The minimum Linux mainline version required for this feature.
|
|
// Used for the error string, and for sanity checking during testing.
|
|
MinimumVersion Version
|
|
|
|
// The name of the feature that isn't supported.
|
|
Name string
|
|
}
|
|
|
|
func (ufe *UnsupportedFeatureError) Error() string {
|
|
if ufe.MinimumVersion.Unspecified() {
|
|
return fmt.Sprintf("%s not supported", ufe.Name)
|
|
}
|
|
return fmt.Sprintf("%s not supported (requires >= %s)", ufe.Name, ufe.MinimumVersion)
|
|
}
|
|
|
|
// Is indicates that UnsupportedFeatureError is ErrNotSupported.
|
|
func (ufe *UnsupportedFeatureError) Is(target error) bool {
|
|
return target == ErrNotSupported
|
|
}
|
|
|
|
type featureTest struct {
|
|
sync.RWMutex
|
|
successful bool
|
|
result error
|
|
}
|
|
|
|
// FeatureTestFn is used to determine whether the kernel supports
|
|
// a certain feature.
|
|
//
|
|
// The return values have the following semantics:
|
|
//
|
|
// err == ErrNotSupported: the feature is not available
|
|
// err == nil: the feature is available
|
|
// err != nil: the test couldn't be executed
|
|
type FeatureTestFn func() error
|
|
|
|
// FeatureTest wraps a function so that it is run at most once.
|
|
//
|
|
// name should identify the tested feature, while version must be in the
|
|
// form Major.Minor[.Patch].
|
|
//
|
|
// Returns an error wrapping ErrNotSupported if the feature is not supported.
|
|
func FeatureTest(name, version string, fn FeatureTestFn) func() error {
|
|
ft := new(featureTest)
|
|
return func() error {
|
|
ft.RLock()
|
|
if ft.successful {
|
|
defer ft.RUnlock()
|
|
return ft.result
|
|
}
|
|
ft.RUnlock()
|
|
ft.Lock()
|
|
defer ft.Unlock()
|
|
// check one more time on the off
|
|
// chance that two go routines
|
|
// were able to call into the write
|
|
// lock
|
|
if ft.successful {
|
|
return ft.result
|
|
}
|
|
err := fn()
|
|
switch {
|
|
case errors.Is(err, ErrNotSupported):
|
|
v, err := NewVersion(version)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
ft.result = &UnsupportedFeatureError{
|
|
MinimumVersion: v,
|
|
Name: name,
|
|
}
|
|
fallthrough
|
|
|
|
case err == nil:
|
|
ft.successful = true
|
|
|
|
default:
|
|
// We couldn't execute the feature test to a point
|
|
// where it could make a determination.
|
|
// Don't cache the result, just return it.
|
|
return fmt.Errorf("detect support for %s: %w", name, err)
|
|
}
|
|
|
|
return ft.result
|
|
}
|
|
}
|