// This is essentially the same as tools.MergeAndWriteMetadata, but also
// resolves metadata for existing tools by fetching them and computing
// size/sha256 locally.
func mergeAndWriteMetadata(stor storage.Storage, toolsList coretools.List, writeMirrors envtools.ShouldWriteMirrors) error {
existing, err := envtools.ReadMetadata(stor)
if err != nil {
return err
}
metadata := envtools.MetadataFromTools(toolsList)
if metadata, err = envtools.MergeMetadata(metadata, existing); err != nil {
return err
}
if err = envtools.ResolveMetadata(stor, metadata); err != nil {
return err
}
return envtools.WriteMetadata(stor, metadata, writeMirrors)
}
func (*metadataHelperSuite) TestMergeMetadata(c *gc.C) {
md1 := &tools.ToolsMetadata{
Release: "precise",
Version: "1.2.3",
Arch: "amd64",
Path: "path1",
}
md2 := &tools.ToolsMetadata{
Release: "precise",
Version: "1.2.3",
Arch: "amd64",
Path: "path2",
}
md3 := &tools.ToolsMetadata{
Release: "raring",
Version: "1.2.3",
Arch: "amd64",
Path: "path3",
}
withSize := func(md *tools.ToolsMetadata, size int64) *tools.ToolsMetadata {
clone := *md
clone.Size = size
return &clone
}
withSHA256 := func(md *tools.ToolsMetadata, sha256 string) *tools.ToolsMetadata {
clone := *md
clone.SHA256 = sha256
return &clone
}
type mdlist []*tools.ToolsMetadata
type test struct {
name string
lhs, rhs, merged []*tools.ToolsMetadata
err string
}
tests := []test{{
name: "non-empty lhs, empty rhs",
lhs: mdlist{md1},
rhs: nil,
merged: mdlist{md1},
}, {
name: "empty lhs, non-empty rhs",
lhs: nil,
rhs: mdlist{md2},
merged: mdlist{md2},
}, {
name: "identical lhs, rhs",
lhs: mdlist{md1},
rhs: mdlist{md1},
merged: mdlist{md1},
}, {
name: "same tools in lhs and rhs, neither have size: prefer lhs",
lhs: mdlist{md1},
rhs: mdlist{md2},
merged: mdlist{md1},
}, {
name: "same tools in lhs and rhs, only lhs has a size: prefer lhs",
lhs: mdlist{withSize(md1, 123)},
rhs: mdlist{md2},
merged: mdlist{withSize(md1, 123)},
}, {
name: "same tools in lhs and rhs, only rhs has a size: prefer rhs",
lhs: mdlist{md1},
rhs: mdlist{withSize(md2, 123)},
merged: mdlist{withSize(md2, 123)},
}, {
name: "same tools in lhs and rhs, both have the same size: prefer lhs",
lhs: mdlist{withSize(md1, 123)},
rhs: mdlist{withSize(md2, 123)},
merged: mdlist{withSize(md1, 123)},
}, {
name: "same tools in lhs and rhs, both have different sizes: error",
lhs: mdlist{withSize(md1, 123)},
rhs: mdlist{withSize(md2, 456)},
err: "metadata mismatch for 1\\.2\\.3-precise-amd64: sizes=\\(123,456\\) sha256=\\(,\\)",
}, {
name: "same tools in lhs and rhs, both have same size but different sha256: error",
lhs: mdlist{withSHA256(withSize(md1, 123), "a")},
rhs: mdlist{withSHA256(withSize(md2, 123), "b")},
err: "metadata mismatch for 1\\.2\\.3-precise-amd64: sizes=\\(123,123\\) sha256=\\(a,b\\)",
}, {
name: "lhs is a proper superset of rhs: union of lhs and rhs",
lhs: mdlist{md1, md3},
rhs: mdlist{md1},
merged: mdlist{md1, md3},
}, {
name: "rhs is a proper superset of lhs: union of lhs and rhs",
lhs: mdlist{md1},
rhs: mdlist{md1, md3},
merged: mdlist{md1, md3},
}}
for i, test := range tests {
c.Logf("test %d: %s", i, test.name)
merged, err := tools.MergeMetadata(test.lhs, test.rhs)
if test.err == "" {
c.Assert(err, gc.IsNil)
c.Assert(merged, gc.DeepEquals, test.merged)
} else {
c.Assert(err, gc.ErrorMatches, test.err)
c.Assert(merged, gc.IsNil)
}
}
}