[filecache] Add IsCacheMiss (#283)

mikeland73 · web-flow · commit 580a51617953 · 2024-04-01T15:59:09.000-07:00
## Summary In response to: https://github.com/jetpack-io/devbox/blob/main/internal/nix/search.go#L175-L175 ## How was it tested?
diff --git a/filecache/filecache.go b/filecache/filecache.go
@@ -90,3 +90,7 @@ func (c *cache) filename(key string) string {
 	_ = os.MkdirAll(dir, 0755)
 	return filepath.Join(dir, key)
 }
+
+func IsCacheMiss(err error) bool {
+	return errors.Is(err, NotFound) || errors.Is(err, Expired)
+}

Original file line number	Diff line number	Diff line change
`@@ -90,3 +90,7 @@ func (c *cache) filename(key string) string {`
`90`	`90`	`_ = os.MkdirAll(dir, 0755)`
`91`	`91`	`return filepath.Join(dir, key)`
`92`	`92`	`}`
	`93`	`+`
	`94`	`+func IsCacheMiss(err error) bool {`
	`95`	`+ return errors.Is(err, NotFound) \|\| errors.Is(err, Expired)`
	`96`	`+}`