pm/installed.go

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package pm
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import (
"errors"
"fmt"
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"sort"
"strings"
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)
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// Installed tracks installed packages.
type Installed map[Name]Meta
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// Traverse returns a chan of Meta that will be sanely sorted.
func (i Installed) Traverse() <-chan Meta {
r := make(chan Meta)
go func() {
names := Names{}
for n := range i {
names = append(names, n)
}
sort.Sort(names)
for _, n := range names {
r <- i[n]
}
close(r)
}()
return r
}
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// Removable calculates if the packages requested in "in" can all be removed.
func (i Installed) Removable(names []string) (Metas, error) {
inm := map[Name]bool{}
// XXX (sm): here we simply check if the package exists; eventually we'll
// have to check transitive dependencies, and deal with explicitly and
// implicitly installed packages.
found := map[Name]Meta{}
for _, name := range names {
n := Name(name)
inm[n] = true
if m, ok := i[n]; ok {
found[n] = m
}
}
if len(found) > len(inm) {
return nil, errors.New("should not have been able to find more than asked for, but did; internals are inconsistent.")
} else if len(inm) > len(found) {
// user asked for something that isn't installed.
missing := []string{}
for _, name := range names {
if _, ok := found[Name(name)]; !ok {
missing = append(missing, name)
}
}
return nil, fmt.Errorf("packages not installed: %v", strings.Join(missing, ", "))
}
if len(found) != len(inm) {
return nil, fmt.Errorf("escapes logic")
}
// XXX (sm): the ordering here will also eventually depend on transitive
// dependencies.
r := Metas{}
for _, m := range found {
r = append(r, m)
}
return r, nil
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}