Create shared fn to read a lockfile

action/install.go

diff --git a/action/install.go b/action/install.go
index 3deb9d2..bf17caa 100644
--- a/action/install.go
+++ b/action/install.go
@@ -1,7 +1,6 @@
 package action
 
 import (
-	"io/ioutil"
 	"path/filepath"
 
 	"github.com/Masterminds/glide/cache"
@@ -31,10 +30,17 @@
 		return
 	}
 	// Load lockfile
-	lock, err := LoadLockfile(base, conf)
+	lock, err := cfg.ReadLockFile(filepath.Join(base, gpath.LockFile))
 	if err != nil {
 		msg.Die("Could not load lockfile.")
 	}
+	// Verify lockfile hasn't changed
+	hash, err := conf.Hash()
+	if err != nil {
+		msg.Die("Could not load lockfile.")
+	} else if hash != lock.Hash {
+		msg.Warn("Lock file may be out of date. Hash check of YAML failed. You may need to run 'update'")
+	}
 
 	// Delete unused packages
 	if installer.DeleteUnused {
@@ -77,28 +83,3 @@
 		}
 	}
 }
-
-// LoadLockfile loads the contents of a glide.lock file.
-//
-// TODO: This should go in another package.
-func LoadLockfile(base string, conf *cfg.Config) (*cfg.Lockfile, error) {
-	yml, err := ioutil.ReadFile(filepath.Join(base, gpath.LockFile))
-	if err != nil {
-		return nil, err
-	}
-	lock, err := cfg.LockfileFromYaml(yml)
-	if err != nil {
-		return nil, err
-	}
-
-	hash, err := conf.Hash()
-	if err != nil {
-		return nil, err
-	}
-
-	if hash != lock.Hash {
-		msg.Warn("Lock file may be out of date. Hash check of YAML failed. You may need to run 'update'")
-	}
-
-	return lock, nil
-}

cfg/lock.go

diff --git a/cfg/lock.go b/cfg/lock.go
index 3a157d0..215483c 100644
--- a/cfg/lock.go
+++ b/cfg/lock.go
@@ -72,6 +72,19 @@
 	return sha256.Sum256(yml), nil
 }
 
+// ReadLockFile loads the contents of a glide.lock file.
+func ReadLockFile(lockpath string) (*Lockfile, error) {
+	yml, err := ioutil.ReadFile(lockpath)
+	if err != nil {
+		return nil, err
+	}
+	lock, err := LockfileFromYaml(yml)
+	if err != nil {
+		return nil, err
+	}
+	return lock, nil
+}
+
 // Locks is a slice of locked dependencies.
 type Locks []*Lock