Merge pull request #214 from NyaaaWhatsUpDoc/improvement/update-storage-library

add git.iim.gay/grufwub/go-store for storage backend, replacing blob.Storage

1 files changed, 48 insertions, 0 deletions

diff --git a/vendor/git.iim.gay/grufwub/go-store/storage/fs.go b/vendor/git.iim.gay/grufwub/go-store/storage/fs.go
new file mode 100644
index 000000000..2d6c44caf
--- /dev/null
+++ b/vendor/git.iim.gay/grufwub/go-store/storage/fs.go
@@ -0,0 +1,48 @@
+package storage
+
+import (
+	"os"
+	"syscall"
+
+	"git.iim.gay/grufwub/go-store/util"
+)
+
+const (
+	defaultDirPerms      = 0755
+	defaultFilePerms     = 0644
+	defaultFileROFlags   = syscall.O_RDONLY
+	defaultFileRWFlags   = syscall.O_CREAT | syscall.O_RDWR
+	defaultFileLockFlags = syscall.O_RDONLY | syscall.O_EXCL | syscall.O_CREAT
+)
+
+// NOTE:
+// These functions are for opening storage files,
+// not necessarily for e.g. initial setup (OpenFile)
+
+// open should not be called directly
+func open(path string, flags int) (*os.File, error) {
+	var fd int
+	err := util.RetryOnEINTR(func() (err error) {
+		fd, err = syscall.Open(path, flags, defaultFilePerms)
+		return
+	})
+	if err != nil {
+		return nil, err
+	}
+	return os.NewFile(uintptr(fd), path), nil
+}
+
+// stat checks for a file on disk
+func stat(path string) (bool, error) {
+	var stat syscall.Stat_t
+	err := util.RetryOnEINTR(func() error {
+		return syscall.Stat(path, &stat)
+	})
+	if err != nil {
+		if err == syscall.ENOENT {
+			err = nil
+		}
+		return false, err
+	}
+	return true, nil
+}