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builder: fix duplicate mount release 

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
This commit is contained in:
Tonis Tiigi 2018-10-22 17:24:20 -07:00
parent f7e5154f37
commit 2732fe527f
1 changed files with 14 additions and 4 deletions
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18
builder/builder-next/adapters/snapshot/snapshot.go
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@ -426,10 +426,11 @@ func (s *snapshotter) Close() error {
}
type mountable struct {
mu sync.Mutex
mounts []mount.Mount
acquire func() ([]mount.Mount, error)
release func() error
mu sync.Mutex
mounts []mount.Mount
acquire func() ([]mount.Mount, error)
release func() error
refCount int
}
func (m *mountable) Mount() ([]mount.Mount, error) {
@ -437,6 +438,7 @@ func (m *mountable) Mount() ([]mount.Mount, error) {
defer m.mu.Unlock()
if m.mounts != nil {
m.refCount++
return m.mounts, nil
}
@ -445,6 +447,7 @@ func (m *mountable) Mount() ([]mount.Mount, error) {
return nil, err
}
m.mounts = mounts
m.refCount = 1
return m.mounts, nil
}
@ -452,6 +455,13 @@ func (m *mountable) Mount() ([]mount.Mount, error) {
func (m *mountable) Release() error {
m.mu.Lock()
defer m.mu.Unlock()
if m.refCount > 1 {
m.refCount--
return nil
}
m.refCount = 0
if m.release == nil {
return nil
}