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* Implement mount info gatherer * Test the gatherer * Add gatherer to list of standard gatherers
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53 changes: 53 additions & 0 deletions
53
internal/factsengine/gatherers/mocks/MountParserInterface.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| package gatherers | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "strings" | ||
|
|
||
| "github.com/hashicorp/go-envparse" | ||
| "github.com/moby/sys/mountinfo" | ||
| log "github.com/sirupsen/logrus" | ||
| "github.com/trento-project/agent/pkg/factsengine/entities" | ||
| "github.com/trento-project/agent/pkg/utils" | ||
| ) | ||
|
|
||
| const ( | ||
| MountInfoGathererName = "mount_info" | ||
| ) | ||
|
|
||
| // nolint:gochecknoglobals | ||
| var ( | ||
| MountInfoParsingError = entities.FactGatheringError{ | ||
| Type: "mount-info-parsing-error", | ||
| Message: "error parsing mount information", | ||
| } | ||
|
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| MountInfoMissingArgumentError = entities.FactGatheringError{ | ||
| Type: "mount-info-missing-argument", | ||
| Message: "missing required argument", | ||
| } | ||
|
|
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| MountInfoDecodingError = entities.FactGatheringError{ | ||
| Type: "mount-info-decoding-error", | ||
| Message: "error decoding mount information", | ||
| } | ||
| ) | ||
|
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| //go:generate mockery --name=MountParserInterface | ||
| type MountParserInterface interface { | ||
| GetMounts(f mountinfo.FilterFunc) ([]*mountinfo.Info, error) | ||
| } | ||
|
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| type MountParser struct{} | ||
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| func (x *MountParser) GetMounts(f mountinfo.FilterFunc) ([]*mountinfo.Info, error) { | ||
| return mountinfo.GetMounts(f) | ||
| } | ||
|
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| type MountInfoGatherer struct { | ||
| mInfo MountParserInterface | ||
| executor utils.CommandExecutor | ||
| } | ||
|
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| type MountInfoResult struct { | ||
| BlockUUID string `json:"block_uuid"` | ||
| FSType string `json:"fs_type"` | ||
| MountPoint string `json:"mount_point"` | ||
| Options string `json:"options"` | ||
| Source string `json:"source"` | ||
| } | ||
|
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| func NewDefaultMountInfoGatherer() *MountInfoGatherer { | ||
| return NewMountInfoGatherer(&MountParser{}, utils.Executor{}) | ||
| } | ||
|
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| func NewMountInfoGatherer(mInfo MountParserInterface, executor utils.CommandExecutor) *MountInfoGatherer { | ||
| return &MountInfoGatherer{mInfo: mInfo, executor: executor} | ||
| } | ||
|
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| func (g *MountInfoGatherer) Gather(factsRequests []entities.FactRequest) ([]entities.Fact, error) { | ||
| facts := []entities.Fact{} | ||
| log.Infof("Starting %s facts gathering process", MountInfoGathererName) | ||
| mounts, err := g.mInfo.GetMounts(nil) | ||
| if err != nil { | ||
| return nil, MountInfoParsingError.Wrap(err.Error()) | ||
| } | ||
|
|
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| for _, requestedFact := range factsRequests { | ||
| if requestedFact.Argument == "" { | ||
| log.Errorf("could not gather facts for %s gatherer, missing argument", MountInfoGathererName) | ||
| facts = append(facts, entities.NewFactGatheredWithError(requestedFact, &MountInfoMissingArgumentError)) | ||
| continue | ||
| } | ||
|
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| var foundMountInfoResult = MountInfoResult{} | ||
|
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| for _, mount := range mounts { | ||
| if mount.Mountpoint == requestedFact.Argument { | ||
| foundMountInfoResult = MountInfoResult{ | ||
| MountPoint: mount.Mountpoint, | ||
| Source: mount.Source, | ||
| FSType: mount.FSType, | ||
| Options: mount.Options, | ||
| } | ||
|
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| if blkidOuptut, err := g.executor.Exec("blkid", foundMountInfoResult.Source, "-o", "export"); err != nil { | ||
| log.Warnf("blkid command failed for source %s: %s", foundMountInfoResult.Source, err) | ||
| } else if fields, err := envparse.Parse(strings.NewReader(string(blkidOuptut))); err != nil { | ||
| log.Warnf("error parsing the blkid output: %s", err) | ||
| } else { | ||
| foundMountInfoResult.BlockUUID = fields["UUID"] | ||
| } | ||
|
|
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| continue | ||
| } | ||
| } | ||
|
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| factValue, err := mountInfoResultToFactValue(foundMountInfoResult) | ||
| if err != nil { | ||
| facts = append(facts, entities.NewFactGatheredWithError(requestedFact, MountInfoDecodingError.Wrap(err.Error()))) | ||
| continue | ||
| } | ||
| facts = append(facts, entities.NewFactGatheredWithRequest(requestedFact, factValue)) | ||
| } | ||
|
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| log.Infof("Requested %s facts gathered", MountInfoGathererName) | ||
| return facts, nil | ||
| } | ||
|
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| func mountInfoResultToFactValue(result MountInfoResult) (entities.FactValue, error) { | ||
| marshalled, err := json.Marshal(&result) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| var unmarshalled interface{} | ||
| err = json.Unmarshal(marshalled, &unmarshalled) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| return entities.NewFactValue(unmarshalled) | ||
| } |
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