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https://github.com/docker/cli.git
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John Howard
2a282eed74
Signed-off-by: John Howard <John.Howard@microsoft.com> Upstream-commit: 5a5f9e93e9134378ffb5d0294577875a0d8c1937 Component: engine
70 lines
1.8 KiB
Go
70 lines
1.8 KiB
Go
package hcsshim
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import (
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"fmt"
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"syscall"
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"unsafe"
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"github.com/Sirupsen/logrus"
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)
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// CreateLayer creates a new, empty, read-only layer on the filesystem based on
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// the parent layer provided.
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func CreateLayer(info DriverInfo, id, parent string) error {
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title := "hcsshim::CreateLayer "
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logrus.Debugf(title+"Flavour %s ID %s parent %s", info.Flavour, id, parent)
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// Load the DLL and get a handle to the procedure we need
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dll, proc, err := loadAndFind(procCreateLayer)
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if dll != nil {
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defer dll.Release()
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}
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if err != nil {
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return err
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}
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// Convert id to uint16 pointer for calling the procedure
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idp, err := syscall.UTF16PtrFromString(id)
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if err != nil {
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err = fmt.Errorf(title+" - Failed conversion of id %s to pointer %s", id, err)
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logrus.Error(err)
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return err
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}
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// Convert parent to uint16 pointer for calling the procedure
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parentp, err := syscall.UTF16PtrFromString(parent)
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if err != nil {
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err = fmt.Errorf(title+" - Failed conversion of parent %s to pointer %s", parent, err)
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logrus.Error(err)
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return err
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}
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// Convert info to API calling convention
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infop, err := convertDriverInfo(info)
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if err != nil {
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err = fmt.Errorf(title+" - Failed conversion info struct %s", parent, err)
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logrus.Error(err)
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return err
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}
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// Call the procedure itself.
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r1, _, _ := proc.Call(
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uintptr(unsafe.Pointer(&infop)),
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uintptr(unsafe.Pointer(idp)),
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uintptr(unsafe.Pointer(parentp)))
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use(unsafe.Pointer(&infop))
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use(unsafe.Pointer(idp))
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use(unsafe.Pointer(parentp))
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if r1 != 0 {
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err = fmt.Errorf(title+" - Win32 API call returned error r1=%d err=%s id=%s parent=%s flavour=%d",
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r1, syscall.Errno(r1), id, parent, info.Flavour)
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logrus.Error(err)
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return err
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}
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logrus.Debugf(title+" - succeeded id=%s parent=%s flavour=%d", id, parent, info.Flavour)
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return nil
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}
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