From d03908eb8e25fced05693522fc00e2ba66ce2464 Mon Sep 17 00:00:00 2001
From: Eric Phillips <eric@ewpt3ch.com>
Date: Thu, 21 May 2026 22:34:58 -0600
Subject: [PATCH] create_map test ready

---
 internal/repomaint/create_map.go     | 11 +++++
 internal/repomaint/repomaint.go      | 43 +++++++++++++++++
 internal/repomaint/repomaint_test.go | 70 ++++++++++++++++++++++++++++
 3 files changed, 124 insertions(+)
 create mode 100644 internal/repomaint/create_map.go
 create mode 100644 internal/repomaint/repomaint.go
 create mode 100644 internal/repomaint/repomaint_test.go

diff --git a/internal/repomaint/create_map.go b/internal/repomaint/create_map.go
new file mode 100644
index 0000000..32d69ee
--- /dev/null
+++ b/internal/repomaint/create_map.go
@@ -0,0 +1,11 @@
+package repomaint
+
+func (r *RepoSync) createMap(repo string) (map[string]string, error) {
+	// create slice all filenames in repo
+	// open db file
+	// for file in slice
+	// find in db
+	// insert into map as map[packagename] = filename
+	// return map
+	return nil, nil
+}
diff --git a/internal/repomaint/repomaint.go b/internal/repomaint/repomaint.go
new file mode 100644
index 0000000..b5a2a7a
--- /dev/null
+++ b/internal/repomaint/repomaint.go
@@ -0,0 +1,43 @@
+package repomaint
+
+import (
+	"os"
+
+	"github.com/ewpt3ch/pkgstash/internal/cache"
+)
+
+type CacheClient interface {
+	FetchDB() error
+	Fetch(relpath string) (*cache.CacheFile, error)
+}
+
+type RepoSync struct {
+	c     CacheClient
+	root  *os.Root
+	repos []string
+}
+
+func NewRepoSync(c CacheClient, path string, repos []string) (*RepoSync, error) {
+	root, err := os.OpenRoot(path)
+	if err != nil {
+		return nil, err
+	}
+	rs := RepoSync{
+		c:     c,
+		root:  root,
+		repos: repos,
+	}
+	return &rs, nil
+}
+
+func (r *RepoSync) Sync() error {
+	// create map of pkgname to filenames from current db
+	// call cache db fetch
+	if err := r.c.FetchDB(); err != nil {
+		return err
+	}
+	// create map from pkgnames in new db
+	// compare and fetch
+	// call cache cleanup
+	return nil
+}
diff --git a/internal/repomaint/repomaint_test.go b/internal/repomaint/repomaint_test.go
new file mode 100644
index 0000000..49a1c02
--- /dev/null
+++ b/internal/repomaint/repomaint_test.go
@@ -0,0 +1,70 @@
+package repomaint
+
+import (
+	"io"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/ewpt3ch/pkgstash/internal/cache"
+	"github.com/stretchr/testify/assert"
+)
+
+// create a CacheClient to mock cache.Fetch and cache.FetchDB to fulfill
+// expected interface in RepoSync struct
+type mockCache struct {
+	fetched []string
+}
+
+func (m *mockCache) FetchDB() error { return nil }
+func (m *mockCache) Fetch(relPath string) (*cache.CacheFile, error) {
+	m.fetched = append(m.fetched, relPath)
+	return nil, nil
+}
+
+func TestSyncMapBuild(t *testing.T) {
+	testFiles := make(map[string]string)
+	testFiles["linux"] = "linux-7.0.9.arch1-1-x86_64.pkg.tar.zst"
+	testFiles["linux-api-headers"] = "linux-api-headers-6.19-1-x86_64.pkg.tar.zst"
+	testFiles["gcc-rust"] = "gcc-rust-16.1.1+r12+g301eb08fa2c5-1-x86_64.pkg.tar.zst"
+
+	t.Run("build map from real db file", func(t *testing.T) {
+		// create test structs
+		c := &mockCache{
+			fetched: make([]string, 5),
+		}
+		rs, err := NewRepoSync(c, t.TempDir(), []string{"core"})
+		if err != nil {
+			t.Fatalf("failed to create RepoMaint: %v", err)
+		}
+		repoPath := filepath.Join(rs.repos[0], "os/x86_64")
+		rs.root.MkdirAll(repoPath, 0750)
+		for _, f := range testFiles {
+			rs.root.WriteFile(filepath.Join(repoPath, f), []byte{}, 0644)
+		}
+		src, err := os.Open(filepath.Join("testdata", "pre.core.db.tar.gz"))
+		if err != nil {
+			t.Fatalf("unable to open src db for copy: %v", err)
+		}
+		defer src.Close()
+		dst, err := rs.root.Create(filepath.Join(repoPath, "core.db.tar.gz"))
+		if err != nil {
+			t.Fatalf("unable to open dst db for copy: %s", err)
+		}
+		defer dst.Close()
+		if _, err := io.Copy(dst, src); err != nil {
+			t.Fatalf("failed to copy db: %v", err)
+		}
+
+		// run tests
+
+		pkgMap, err := rs.createMap(rs.repos[0])
+		if err != nil {
+			t.Fatalf("failed to create map: %v", err)
+		}
+		for key, val := range testFiles {
+			assert.Equal(t, val, pkgMap[key])
+		}
+	})
+
+}