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package system
import (
"errors"
"fmt"
"os"
)
// Ensure ensures the existence of a directory.
func (sys *I) Ensure(name string, perm os.FileMode) *I {
sys.ops = append(sys.ops, &mkdirOp{User, name, perm, false})
return sys
}
// Ephemeral ensures the existence of a directory until its [Enablement] is no longer satisfied.
func (sys *I) Ephemeral(et Enablement, name string, perm os.FileMode) *I {
sys.ops = append(sys.ops, &mkdirOp{et, name, perm, true})
return sys
}
// mkdirOp implements [I.Ensure] and [I.Ephemeral].
type mkdirOp struct {
et Enablement
path string
perm os.FileMode
ephemeral bool
}
func (m *mkdirOp) Type() Enablement { return m.et }
func (m *mkdirOp) apply(sys *I) error {
sys.verbose("ensuring directory", m)
if err := sys.mkdir(m.path, m.perm); err != nil {
if !errors.Is(err, os.ErrExist) {
return newOpError("mkdir", err, false)
}
// directory exists, ensure mode
return newOpError("mkdir", sys.chmod(m.path, m.perm), false)
} else {
return nil
}
}
func (m *mkdirOp) revert(sys *I, ec *Criteria) error {
if !m.ephemeral {
// skip non-ephemeral dir and do not log anything
return nil
}
if ec.hasType(m.Type()) {
sys.verbose("destroying ephemeral directory", m)
return newOpError("mkdir", sys.remove(m.path), true)
} else {
sys.verbose("skipping ephemeral directory", m)
return nil
}
}
func (m *mkdirOp) Is(o Op) bool {
target, ok := o.(*mkdirOp)
return ok && m != nil && target != nil && *m == *target
}
func (m *mkdirOp) Path() string { return m.path }
func (m *mkdirOp) String() string {
t := "ensure"
if m.ephemeral {
t = TypeString(m.Type())
}
return fmt.Sprintf("mode: %s type: %s path: %q", m.perm.String(), t, m.path)
}
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