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authorMatthew Heon <matthew.heon@gmail.com>2017-11-01 11:24:59 -0400
committerMatthew Heon <matthew.heon@gmail.com>2017-11-01 11:24:59 -0400
commita031b83a09a8628435317a03f199cdc18b78262f (patch)
treebc017a96769ce6de33745b8b0b1304ccf38e9df0 /vendor/github.com/Microsoft/hcsshim/getlayermountpath.go
parent2b74391cd5281f6fdf391ff8ad50fd1490f6bf89 (diff)
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Initial checkin from CRI-O repo
Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
Diffstat (limited to 'vendor/github.com/Microsoft/hcsshim/getlayermountpath.go')
-rw-r--r--vendor/github.com/Microsoft/hcsshim/getlayermountpath.go55
1 files changed, 55 insertions, 0 deletions
diff --git a/vendor/github.com/Microsoft/hcsshim/getlayermountpath.go b/vendor/github.com/Microsoft/hcsshim/getlayermountpath.go
new file mode 100644
index 000000000..89f8079d0
--- /dev/null
+++ b/vendor/github.com/Microsoft/hcsshim/getlayermountpath.go
@@ -0,0 +1,55 @@
+package hcsshim
+
+import (
+ "syscall"
+
+ "github.com/sirupsen/logrus"
+)
+
+// GetLayerMountPath will look for a mounted layer with the given id and return
+// the path at which that layer can be accessed. This path may be a volume path
+// if the layer is a mounted read-write layer, otherwise it is expected to be the
+// folder path at which the layer is stored.
+func GetLayerMountPath(info DriverInfo, id string) (string, error) {
+ title := "hcsshim::GetLayerMountPath "
+ logrus.Debugf(title+"Flavour %d ID %s", info.Flavour, id)
+
+ // Convert info to API calling convention
+ infop, err := convertDriverInfo(info)
+ if err != nil {
+ logrus.Error(err)
+ return "", err
+ }
+
+ var mountPathLength uintptr
+ mountPathLength = 0
+
+ // Call the procedure itself.
+ logrus.Debugf("Calling proc (1)")
+ err = getLayerMountPath(&infop, id, &mountPathLength, nil)
+ if err != nil {
+ err = makeErrorf(err, title, "(first call) id=%s flavour=%d", id, info.Flavour)
+ logrus.Error(err)
+ return "", err
+ }
+
+ // Allocate a mount path of the returned length.
+ if mountPathLength == 0 {
+ return "", nil
+ }
+ mountPathp := make([]uint16, mountPathLength)
+ mountPathp[0] = 0
+
+ // Call the procedure again
+ logrus.Debugf("Calling proc (2)")
+ err = getLayerMountPath(&infop, id, &mountPathLength, &mountPathp[0])
+ if err != nil {
+ err = makeErrorf(err, title, "(second call) id=%s flavour=%d", id, info.Flavour)
+ logrus.Error(err)
+ return "", err
+ }
+
+ path := syscall.UTF16ToString(mountPathp[0:])
+ logrus.Debugf(title+"succeeded flavour=%d id=%s path=%s", info.Flavour, id, path)
+ return path, nil
+}