github.com/niedbalski/juju@v0.0.0-20190215020005-8ff100488e47/environs/tools/validation.go (about)

     1  // Copyright 2013 Canonical Ltd.
     2  // Licensed under the AGPLv3, see LICENCE file for details.
     3  
     4  package tools
     5  
     6  import (
     7  	"fmt"
     8  
     9  	"github.com/juju/version"
    10  
    11  	"github.com/juju/juju/environs/simplestreams"
    12  	jujuversion "github.com/juju/juju/version"
    13  )
    14  
    15  // ToolsMetadataLookupParams is used to query metadata for matching tools.
    16  type ToolsMetadataLookupParams struct {
    17  	simplestreams.MetadataLookupParams
    18  	Version string
    19  	Major   int
    20  	Minor   int
    21  }
    22  
    23  // ValidateToolsMetadata attempts to load tools metadata for the specified cloud attributes and returns
    24  // any tools versions found, or an error if the metadata could not be loaded.
    25  func ValidateToolsMetadata(params *ToolsMetadataLookupParams) ([]string, *simplestreams.ResolveInfo, error) {
    26  	if len(params.Sources) == 0 {
    27  		return nil, nil, fmt.Errorf("required parameter sources not specified")
    28  	}
    29  	if params.Version == "" && params.Major == 0 {
    30  		params.Version = jujuversion.Current.String()
    31  	}
    32  	var toolsConstraint *ToolsConstraint
    33  	if params.Version == "" {
    34  		toolsConstraint = NewGeneralToolsConstraint(params.Major, params.Minor, simplestreams.LookupParams{
    35  			CloudSpec: simplestreams.CloudSpec{
    36  				Region:   params.Region,
    37  				Endpoint: params.Endpoint,
    38  			},
    39  			Stream: params.Stream,
    40  			Series: []string{params.Series},
    41  			Arches: params.Architectures,
    42  		})
    43  	} else {
    44  		versNum, err := version.Parse(params.Version)
    45  		if err != nil {
    46  			return nil, nil, err
    47  		}
    48  		toolsConstraint = NewVersionedToolsConstraint(versNum, simplestreams.LookupParams{
    49  			CloudSpec: simplestreams.CloudSpec{
    50  				Region:   params.Region,
    51  				Endpoint: params.Endpoint,
    52  			},
    53  			Stream: params.Stream,
    54  			Series: []string{params.Series},
    55  			Arches: params.Architectures,
    56  		})
    57  	}
    58  	matchingTools, resolveInfo, err := Fetch(params.Sources, toolsConstraint)
    59  	if err != nil {
    60  		return nil, resolveInfo, err
    61  	}
    62  	if len(matchingTools) == 0 {
    63  		return nil, resolveInfo, fmt.Errorf("no matching agent binaries found for constraint %+v", toolsConstraint)
    64  	}
    65  	versions := make([]string, len(matchingTools))
    66  	for i, tm := range matchingTools {
    67  		vers := version.Binary{
    68  			Number: version.MustParse(tm.Version),
    69  			Series: tm.Release,
    70  			Arch:   tm.Arch,
    71  		}
    72  		versions[i] = vers.String()
    73  	}
    74  	return versions, resolveInfo, nil
    75  }