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refactor(*): rework cloudconfig for better extensibility and consistency

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This change creates a few simple interfaces for coreos-specific
configuration options and moves things to them wherever possible; so if
an option needs to write a file, or create a unit, it is acted on
exactly the same way as every other file/unit that needs to be written
during the cloud configuration process.
This commit is contained in:
Jonathan Boulle
2014-05-09 20:33:34 -07:00
parent e814b37839
commit 31cfad91e3
12 changed files with 341 additions and 230 deletions
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15
system/systemd.go
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@@ -17,12 +17,17 @@ import (
// never be used as a true MachineID
const fakeMachineID = "42000000000000000000000000000042"
// Name for drop-in service configuration files created by cloudconfig
const cloudConfigDropIn = "20-cloudinit.conf"
type Unit struct {
Name string
Mask bool
Enable bool
Runtime bool
Content string
Command string
DropIn bool // drop-in configuration? if so, a cloudinit.conf will be generated
}
func (u *Unit) Type() string {
@@ -42,8 +47,8 @@ func (u *Unit) Group() (group string) {
type Script []byte
// UnitDestination builds the appropriate absolte file path for
// the given unit. The root argument indicates the effective base
// UnitDestination builds the appropriate absolute file path for
// the given Unit. The root argument indicates the effective base
// directory of the system (similar to a chroot).
func UnitDestination(u *Unit, root string) string {
dir := "etc"
@@ -51,7 +56,11 @@ func UnitDestination(u *Unit, root string) string {
dir = "run"
}
return path.Join(root, dir, "systemd", u.Group(), u.Name)
if u.DropIn {
return path.Join(root, dir, "systemd", u.Group(), fmt.Sprintf("%s.d", u.Name), cloudConfigDropIn)
} else {
return path.Join(root, dir, "systemd", u.Group(), u.Name)
}
}
// PlaceUnit writes a unit file at the provided destination, creating