func (s *Snap) Install(targetPath, mountDir string) error {
// ensure mount-point and blob target dir.
for _, dir := range []string{mountDir, filepath.Dir(targetPath)} {
if err := os.MkdirAll(dir, 0755); err != nil {
return err
}
}
// This is required so that the tests can simulate a mounted
// snap when we "install" a squashfs snap in the tests.
// We can not mount it for real in the tests, so we just unpack
// it to the location which is good enough for the tests.
if os.Getenv("SNAPPY_SQUASHFS_UNPACK_FOR_TESTS") != "" {
if err := s.Unpack("*", mountDir); err != nil {
return err
}
}
// nothing to do, happens on e.g. first-boot when we already
// booted with the OS snap but its also in the seed.yaml
if s.path == targetPath || osutil.FilesAreEqual(s.path, targetPath) {
return nil
}
// FIXME: cp.CopyFile() has no preserve attribute flag yet
return runCommand("cp", "-a", s.path, targetPath)
}
func (s *Snap) Install(targetPath, mountDir string) error {
// ensure mount-point and blob target dir.
for _, dir := range []string{mountDir, filepath.Dir(targetPath)} {
if err := os.MkdirAll(dir, 0755); err != nil {
return err
}
}
// This is required so that the tests can simulate a mounted
// snap when we "install" a squashfs snap in the tests.
// We can not mount it for real in the tests, so we just unpack
// it to the location which is good enough for the tests.
if os.Getenv("SNAPPY_SQUASHFS_UNPACK_FOR_TESTS") != "" {
if err := s.Unpack("*", mountDir); err != nil {
return err
}
}
// nothing to do, happens on e.g. first-boot when we already
// booted with the OS snap but its also in the seed.yaml
if s.path == targetPath || osutil.FilesAreEqual(s.path, targetPath) {
return nil
}
// try to (hard)link the file, but go on to trying to copy it
// if it fails for whatever reason
//
// link(2) returns EPERM on filesystems that don't support
// hard links (like vfat), so checking the error here doesn't
// make sense vs just trying to copy it.
if err := os.Link(s.path, targetPath); err == nil {
return nil
}
return osutil.CopyFile(s.path, targetPath, osutil.CopyFlagPreserveAll|osutil.CopyFlagSync)
}