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daemon: read-copy-update the daemon config

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Ensure data-race-free access to the daemon configuration without
locking by mutating a deep copy of the config and atomically storing
a pointer to the copy into the daemon-wide configStore value. Any
operations which need to read from the daemon config must capture the
configStore value only once and pass it around to guarantee a consistent
view of the config.

Signed-off-by: Cory Snider <csnider@mirantis.com>
This commit is contained in:
Cory Snider
2022-08-17 17:13:49 -04:00
parent 742ac6e275
commit 0b592467d9
62 changed files with 1819 additions and 568 deletions
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3
daemon/daemon_test.go
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@@ -8,6 +8,7 @@ import (
containertypes "github.com/docker/docker/api/types/container"
"github.com/docker/docker/container"
"github.com/docker/docker/daemon/config"
"github.com/docker/docker/errdefs"
"github.com/docker/docker/libnetwork"
"github.com/docker/docker/pkg/idtools"
@@ -300,7 +301,7 @@ func TestMerge(t *testing.T) {
func TestValidateContainerIsolation(t *testing.T) {
d := Daemon{}
_, err := d.verifyContainerSettings(&containertypes.HostConfig{Isolation: containertypes.Isolation("invalid")}, nil, false)
_, err := d.verifyContainerSettings(&config.Config{}, &containertypes.HostConfig{Isolation: containertypes.Isolation("invalid")}, nil, false)
assert.Check(t, is.Error(err, "invalid isolation 'invalid' on "+runtime.GOOS))
}