diff --git a/admin/sync/exercice_files.go b/admin/sync/exercice_files.go
index 73b564e3..5a93f894 100644
--- a/admin/sync/exercice_files.go
+++ b/admin/sync/exercice_files.go
@@ -18,7 +18,7 @@ import (
 
 func BuildFilesListInto(i Importer, exercice *fic.Exercice, into string) (files []string, digests map[string][]byte, errs []error) {
 	// If no files directory, don't display error
-	if !i.exists(path.Join(exercice.Path, into)) {
+	if !i.Exists(path.Join(exercice.Path, into)) {
 		return
 	}
 
@@ -80,7 +80,7 @@ func CheckExerciceFilesPresence(i Importer, exercice *fic.Exercice) (files []str
 	errs = append(errs, berrs...)
 
 	for _, fname := range flist {
-		if !i.exists(path.Join(exercice.Path, "files", fname)) {
+		if !i.Exists(path.Join(exercice.Path, "files", fname)) {
 			errs = append(errs, NewFileError(exercice, fname, fmt.Errorf("No such file or directory")))
 		} else if _, ok := digests[fname]; !ok {
 			errs = append(errs, NewFileError(exercice, fname, fmt.Errorf("unable to import file: No digest given")))
@@ -90,7 +90,7 @@ func CheckExerciceFilesPresence(i Importer, exercice *fic.Exercice) (files []str
 	}
 
 	for fname := range digests {
-		if !i.exists(path.Join(exercice.Path, "files", fname)) {
+		if !i.Exists(path.Join(exercice.Path, "files", fname)) {
 			errs = append(errs, NewFileError(exercice, fname, fmt.Errorf("unable to read file: No such file or directory. Check your DIGESTS.txt for legacy entries.")))
 		}
 	}
diff --git a/admin/sync/exercice_hints.go b/admin/sync/exercice_hints.go
index 5f342f68..c810245d 100644
--- a/admin/sync/exercice_hints.go
+++ b/admin/sync/exercice_hints.go
@@ -47,7 +47,7 @@ func buildExerciceHints(i Importer, exercice *fic.Exercice, exceptions *CheckExc
 			if hint.Content != "" {
 				errs = append(errs, NewHintError(exercice, h, n, fmt.Errorf("content and filename can't be filled at the same time")))
 				continue
-			} else if !i.exists(path.Join(exercice.Path, "hints", hint.Filename)) {
+			} else if !i.Exists(path.Join(exercice.Path, "hints", hint.Filename)) {
 				errs = append(errs, NewHintError(exercice, h, n, fmt.Errorf("%q: File not found", hint.Filename)))
 				continue
 			} else {
diff --git a/admin/sync/exercices.go b/admin/sync/exercices.go
index e3005131..92e109e9 100644
--- a/admin/sync/exercices.go
+++ b/admin/sync/exercices.go
@@ -139,9 +139,9 @@ func BuildExercice(i Importer, theme *fic.Theme, epath string, dmap *map[int64]*
 	e.Title = fixnbsp(e.Title)
 
 	// Texts to format using Markdown
-	if i.exists(path.Join(epath, "overview.txt")) {
+	if i.Exists(path.Join(epath, "overview.txt")) {
 		e.Overview, err = GetFileContent(i, path.Join(epath, "overview.txt"))
-	} else if i.exists(path.Join(epath, "overview.md")) {
+	} else if i.Exists(path.Join(epath, "overview.md")) {
 		e.Overview, err = GetFileContent(i, path.Join(epath, "overview.md"))
 	} else {
 		err = fmt.Errorf("Unable to find overview.txt nor overview.md")
@@ -171,9 +171,9 @@ func BuildExercice(i Importer, theme *fic.Theme, epath string, dmap *map[int64]*
 		}
 	}
 
-	if i.exists(path.Join(epath, "statement.txt")) {
+	if i.Exists(path.Join(epath, "statement.txt")) {
 		e.Statement, err = GetFileContent(i, path.Join(epath, "statement.txt"))
-	} else if i.exists(path.Join(epath, "statement.md")) {
+	} else if i.Exists(path.Join(epath, "statement.md")) {
 		e.Statement, err = GetFileContent(i, path.Join(epath, "statement.md"))
 	} else {
 		err = fmt.Errorf("Unable to find statement.txt nor statement.md")
@@ -193,9 +193,9 @@ func BuildExercice(i Importer, theme *fic.Theme, epath string, dmap *map[int64]*
 		}
 	}
 
-	if i.exists(path.Join(epath, "finished.txt")) {
+	if i.Exists(path.Join(epath, "finished.txt")) {
 		e.Finished, err = GetFileContent(i, path.Join(epath, "finished.txt"))
-	} else if i.exists(path.Join(epath, "finished.md")) {
+	} else if i.Exists(path.Join(epath, "finished.md")) {
 		e.Finished, err = GetFileContent(i, path.Join(epath, "finished.md"))
 	}
 	if err != nil {
@@ -274,7 +274,7 @@ func BuildExercice(i Importer, theme *fic.Theme, epath string, dmap *map[int64]*
 	resolutionFound := false
 
 	e.VideoURI = path.Join(epath, "resolution.mp4")
-	if !i.exists(e.VideoURI) {
+	if !i.Exists(e.VideoURI) {
 		e.VideoURI = ""
 	} else if size, err := GetFileSize(i, e.VideoURI); err != nil {
 		errs = append(errs, NewExerciceError(e, fmt.Errorf("resolution.mp4: %w", err), theme))
@@ -288,11 +288,11 @@ func BuildExercice(i Importer, theme *fic.Theme, epath string, dmap *map[int64]*
 	}
 
 	writeup := path.Join(epath, "resolution.md")
-	if !i.exists(writeup) {
+	if !i.Exists(writeup) {
 		writeup = path.Join(epath, "resolution.txt")
 	}
 
-	if i.exists(writeup) {
+	if i.Exists(writeup) {
 		if size, err := GetFileSize(i, writeup); err != nil {
 			errs = append(errs, NewExerciceError(e, fmt.Errorf("resolution.md: %w", err), theme))
 		} else if size == 0 {
diff --git a/admin/sync/file.go b/admin/sync/file.go
index d70f5cac..4ba5ff10 100644
--- a/admin/sync/file.go
+++ b/admin/sync/file.go
@@ -26,8 +26,8 @@ type Importer interface {
 	Init() error
 	// sync tries to pull the latest modification of the underlying storage.
 	Sync() error
-	// exists checks if the given location exists from the Importer point of view.
-	exists(filename string) bool
+	// Exists checks if the given location exists from the Importer point of view.
+	Exists(filename string) bool
 	// toURL gets the full path/URL to the given file, the Importer will look internaly (used for debuging purpose).
 	toURL(filename string) string
 	// importFile imports the file at the given URI, inside the global FILES/ directory.
@@ -64,7 +64,7 @@ var GlobalImporter Importer
 
 // GetFileSize returns the size.
 func GetFileSize(i Importer, URI string) (size int64, err error) {
-	if i.exists(URI) {
+	if i.Exists(URI) {
 		if fi, err := i.stat(URI); err != nil {
 			return 0, err
 		} else {
@@ -73,7 +73,7 @@ func GetFileSize(i Importer, URI string) (size int64, err error) {
 	}
 
 	dirname := path.Dir(URI)
-	if i.exists(dirname) {
+	if i.Exists(dirname) {
 		filename := path.Base(URI)
 		if files, err := i.listDir(dirname); err != nil {
 			return size, err
@@ -104,7 +104,7 @@ func GetFileSize(i Importer, URI string) (size int64, err error) {
 // GetFile helps to manage huge file transfert by concatenating splitted (with split(1)) files.
 func GetFile(i Importer, URI string) (io.Reader, func(), error) {
 	// Import file if it exists
-	if i.exists(URI) {
+	if i.Exists(URI) {
 		fd, err := i.getFile(URI)
 		return fd, func() {
 			if fdc, ok := fd.(io.ReadCloser); ok {
@@ -115,7 +115,7 @@ func GetFile(i Importer, URI string) (io.Reader, func(), error) {
 
 	// Try to find file parts
 	dirname := path.Dir(URI)
-	if i.exists(dirname) {
+	if i.Exists(dirname) {
 		filename := path.Base(URI)
 		if files, err := i.listDir(dirname); err != nil {
 			return nil, nil, err
diff --git a/admin/sync/importer_cloud.go b/admin/sync/importer_cloud.go
index bac5ce8c..1bb03ce9 100644
--- a/admin/sync/importer_cloud.go
+++ b/admin/sync/importer_cloud.go
@@ -50,7 +50,7 @@ func (i CloudImporter) Sync() error {
 	return nil
 }
 
-func (i CloudImporter) exists(filename string) bool {
+func (i CloudImporter) Exists(filename string) bool {
 	fullURL := i.baseDAV
 	fullURL.Path = path.Join(fullURL.Path, filename)
 
diff --git a/admin/sync/importer_git_common.go b/admin/sync/importer_git_common.go
index 3f1a1c48..6782c075 100644
--- a/admin/sync/importer_git_common.go
+++ b/admin/sync/importer_git_common.go
@@ -18,8 +18,8 @@ func countFileInDir(dirname string) (int, error) {
 	return len(files), nil
 }
 
-func (i GitImporter) exists(filename string) bool {
-	return i.li.exists(filename)
+func (i GitImporter) Exists(filename string) bool {
+	return i.li.Exists(filename)
 }
 
 func (i GitImporter) toURL(filename string) string {
diff --git a/admin/sync/importer_localfs.go b/admin/sync/importer_localfs.go
index 2f5e5421..cf8b0f33 100644
--- a/admin/sync/importer_localfs.go
+++ b/admin/sync/importer_localfs.go
@@ -47,7 +47,7 @@ func (i LocalImporter) Sync() error {
 	return nil
 }
 
-func (i LocalImporter) exists(filename string) bool {
+func (i LocalImporter) Exists(filename string) bool {
 	_, err := os.Stat(i.toURL(filename))
 	return !os.IsNotExist(err)
 }
@@ -68,7 +68,7 @@ func (i LocalImporter) importFile(URI string, next func(string, string) (interfa
 			return nil, err
 		}
 
-		if i.exists(URI) {
+		if i.Exists(URI) {
 			os.Symlink(i.toURL(URI), dest)
 			return next(dest, URI)
 		} else {
diff --git a/admin/sync/themes.go b/admin/sync/themes.go
index 994a6d28..537e4609 100644
--- a/admin/sync/themes.go
+++ b/admin/sync/themes.go
@@ -142,9 +142,9 @@ func BuildTheme(i Importer, tdir string) (th *fic.Theme, exceptions *CheckExcept
 
 	var intro string
 	var err error
-	if i.exists(path.Join(tdir, "overview.txt")) {
+	if i.Exists(path.Join(tdir, "overview.txt")) {
 		intro, err = GetFileContent(i, path.Join(tdir, "overview.txt"))
-	} else if i.exists(path.Join(tdir, "overview.md")) {
+	} else if i.Exists(path.Join(tdir, "overview.md")) {
 		intro, err = GetFileContent(i, path.Join(tdir, "overview.md"))
 	} else {
 		err = fmt.Errorf("unable to find overview.txt nor overview.md")
@@ -180,21 +180,21 @@ func BuildTheme(i Importer, tdir string) (th *fic.Theme, exceptions *CheckExcept
 		}
 	}
 
-	if i.exists(path.Join(tdir, "heading.jpg")) {
+	if i.Exists(path.Join(tdir, "heading.jpg")) {
 		th.Image = path.Join(tdir, "heading.jpg")
-	} else if i.exists(path.Join(tdir, "heading.png")) {
+	} else if i.Exists(path.Join(tdir, "heading.png")) {
 		th.Image = path.Join(tdir, "heading.png")
 	} else {
 		errs = append(errs, NewThemeError(th, fmt.Errorf("heading.jpg: No such file")))
 	}
 
-	if i.exists(path.Join(tdir, "partner.jpg")) {
+	if i.Exists(path.Join(tdir, "partner.jpg")) {
 		th.PartnerImage = path.Join(tdir, "partner.jpg")
-	} else if i.exists(path.Join(tdir, "partner.png")) {
+	} else if i.Exists(path.Join(tdir, "partner.png")) {
 		th.PartnerImage = path.Join(tdir, "partner.png")
 	}
 
-	if i.exists(path.Join(tdir, "partner.txt")) {
+	if i.Exists(path.Join(tdir, "partner.txt")) {
 		if txt, err := GetFileContent(i, path.Join(tdir, "partner.txt")); err != nil {
 			errs = append(errs, NewThemeError(th, fmt.Errorf("unable to get partner's text: %w", err)))
 		} else {