github.com/mwhudson/juju@v0.0.0-20160512215208-90ff01f3497f/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.Architectures) == 0 {
    27  		return nil, nil, fmt.Errorf("required parameter arches not specified")
    28  	}
    29  	if len(params.Sources) == 0 {
    30  		return nil, nil, fmt.Errorf("required parameter sources not specified")
    31  	}
    32  	if params.Version == "" && params.Major == 0 {
    33  		params.Version = jujuversion.Current.String()
    34  	}
    35  	var toolsConstraint *ToolsConstraint
    36  	if params.Version == "" {
    37  		toolsConstraint = NewGeneralToolsConstraint(params.Major, params.Minor, simplestreams.LookupParams{
    38  			CloudSpec: simplestreams.CloudSpec{
    39  				Region:   params.Region,
    40  				Endpoint: params.Endpoint,
    41  			},
    42  			Stream: params.Stream,
    43  			Series: []string{params.Series},
    44  			Arches: params.Architectures,
    45  		})
    46  	} else {
    47  		versNum, err := version.Parse(params.Version)
    48  		if err != nil {
    49  			return nil, nil, err
    50  		}
    51  		toolsConstraint = NewVersionedToolsConstraint(versNum, simplestreams.LookupParams{
    52  			CloudSpec: simplestreams.CloudSpec{
    53  				Region:   params.Region,
    54  				Endpoint: params.Endpoint,
    55  			},
    56  			Stream: params.Stream,
    57  			Series: []string{params.Series},
    58  			Arches: params.Architectures,
    59  		})
    60  	}
    61  	matchingTools, resolveInfo, err := Fetch(params.Sources, toolsConstraint)
    62  	if err != nil {
    63  		return nil, resolveInfo, err
    64  	}
    65  	if len(matchingTools) == 0 {
    66  		return nil, resolveInfo, fmt.Errorf("no matching tools found for constraint %+v", toolsConstraint)
    67  	}
    68  	versions := make([]string, len(matchingTools))
    69  	for i, tm := range matchingTools {
    70  		vers := version.Binary{
    71  			Number: version.MustParse(tm.Version),
    72  			Series: tm.Release,
    73  			Arch:   tm.Arch,
    74  		}
    75  		versions[i] = vers.String()
    76  	}
    77  	return versions, resolveInfo, nil
    78  }