smarter and faster mtime logic

1 files changed, 70 insertions, 0 deletions

diff --git a/age.go b/age.go
new file mode 100644
index 0000000..d70c863
--- /dev/null
+++ b/age.go
@@ -0,0 +1,70 @@
+package gitpb
+
+// functions that check the ages of files
+// and track if the repo needs to be re-scanned
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+	"time"
+
+	"go.wit.com/log"
+)
+
+func (repo *Repo) LastGitPull() (time.Time, error) {
+	return repo.oldMtime(".git/FETCH_HEAD")
+}
+
+func (repo *Repo) GoSumAge() (time.Duration, error) {
+	var mtime time.Time
+	var err error
+	mtime, err = repo.oldMtime("go.sum")
+	if err == nil {
+		return time.Since(mtime), nil
+	}
+	mtime, err = repo.oldMtime("go.mod")
+	if err == nil {
+		return time.Since(mtime), nil
+	}
+	now := time.Now()
+	return time.Since(now), errors.New(repo.GoPath + " go.mod missing")
+}
+
+func (repo *Repo) GitChanged() bool {
+	fullfile := filepath.Join(repo.FullPath, ".git/FETCH_HEAD")
+	lasttime, err := repo.LastGitPull()
+	if err == nil {
+		// if error, something is wrong, assume true
+		log.Info("gitpb:", fullfile, "changed")
+		return true
+	}
+	newtime := repo.LastPull.AsTime()
+
+	if lasttime == newtime {
+		return false
+	}
+	log.Info("gitpb:", fullfile, "changed")
+	return true
+}
+
+func (repo *Repo) GitPullAge() time.Duration {
+	lastpull, err := repo.LastGitPull()
+	if err == nil {
+		// if error, something is wrong, assume true
+		ltime := repo.LastPull.AsTime()
+		return time.Since(ltime)
+	}
+
+	return time.Since(lastpull)
+}
+
+func (repo *Repo) oldMtime(filename string) (time.Time, error) {
+	pathf := filepath.Join(repo.FullPath, filename)
+	statf, err := os.Stat(pathf)
+	if err == nil {
+		return statf.ModTime(), nil
+	}
+	log.Log(GITPBWARN, "Mtime() os.Stat() error", pathf, err)
+	return time.Now(), err
+}