Answer a submodule path with the submodule

The tree page read the gitlink's commit as a blob, which outside the
repository is a bad object id and inside it is the commit's raw text.

3 files changed, 43 insertions, 14 deletions

diff --git a/source/ui-shared.c b/source/ui-shared.cindex e346cbd..c3eee0b 100644--- a/source/ui-shared.c+++ b/source/ui-shared.c@@ -1522,24 +1522,21 @@ static void print_docstart(void) 		html_include(ctx.cfg.header); } -void cgit_print_error_page(int code, const char *msg, const char *fmt, ...)+/*+ * Start the page an error is printed into, and answer whether it started.+ * Once the status line is out the error can only join the body under way,+ * and the page that hit it carries on to its own end.+ */+static int start_error_page(int code, const char *msg) {-	va_list ap;- 	// An error page describes a condition that may not outlast the slot 	// holding it. A request naming a commit not yet pushed would cache its 	// 404 under the never-expiring static ttl and keep serving it after 	// the push, so the error is rendered straight to the visitor instead. 	html_flush(); 	cache_abandon_fill();-	va_start(ap, fmt);-	// Once the status line is out the error can only join the body under-	// way, and the page that hit it carries on to its own end.-	if (ctx.page.headers_sent) {-		vprint_error(fmt, ap);-		va_end(ap);-		return;-	}+	if (ctx.page.headers_sent)+		return 0; 	ctx.page.status = code; 	ctx.page.statusmsg = msg; 	// The error stands where a page would name itself, ahead of the@@ -1554,9 +1551,30 @@ void cgit_print_error_page(int code, const char *msg, const char *fmt, ...) 	ctx.page.charset = PAGE_ENCODING; 	ctx.page.filename = NULL; 	cgit_print_layout_start();+	return 1;+}++void cgit_print_error_page(int code, const char *msg, const char *fmt, ...)+{+	int started = start_error_page(code, msg);+	va_list ap;++	va_start(ap, fmt); 	vprint_error(fmt, ap); 	va_end(ap);-	cgit_print_layout_end();+	if (started)+		cgit_print_layout_end();+}++void cgit_print_submodule_page(char *path, const char *rev)+{+	int started = start_error_page(404, "Not Found");++	html("<div class='error'>This path is a submodule: ");+	cgit_submodule_link("ls-mod", path, rev);+	html("</div>\n");+	if (started)+		cgit_print_layout_end(); }  void cgit_print_blob_too_large(size_t size)
diff --git a/source/ui-shared.c b/source/ui-shared.c
index e346cbd..c3eee0b 100644
--- a/source/ui-shared.c
+++ b/source/ui-shared.c
@@ -1522,24 +1522,21 @@ static void print_docstart(void)
 		html_include(ctx.cfg.header);
 }
 
-void cgit_print_error_page(int code, const char *msg, const char *fmt, ...)
+/*
+ * Start the page an error is printed into, and answer whether it started.
+ * Once the status line is out the error can only join the body under way,
+ * and the page that hit it carries on to its own end.
+ */
+static int start_error_page(int code, const char *msg)
 {
-	va_list ap;
-
 	// An error page describes a condition that may not outlast the slot
 	// holding it. A request naming a commit not yet pushed would cache its
 	// 404 under the never-expiring static ttl and keep serving it after
 	// the push, so the error is rendered straight to the visitor instead.
 	html_flush();
 	cache_abandon_fill();
-	va_start(ap, fmt);
-	// Once the status line is out the error can only join the body under
-	// way, and the page that hit it carries on to its own end.
-	if (ctx.page.headers_sent) {
-		vprint_error(fmt, ap);
-		va_end(ap);
-		return;
-	}
+	if (ctx.page.headers_sent)
+		return 0;
 	ctx.page.status = code;
 	ctx.page.statusmsg = msg;
 	// The error stands where a page would name itself, ahead of the
@@ -1554,9 +1551,30 @@ void cgit_print_error_page(int code, const char *msg, const char *fmt, ...)
 	ctx.page.charset = PAGE_ENCODING;
 	ctx.page.filename = NULL;
 	cgit_print_layout_start();
+	return 1;
+}
+
+void cgit_print_error_page(int code, const char *msg, const char *fmt, ...)
+{
+	int started = start_error_page(code, msg);
+	va_list ap;
+
+	va_start(ap, fmt);
 	vprint_error(fmt, ap);
 	va_end(ap);
-	cgit_print_layout_end();
+	if (started)
+		cgit_print_layout_end();
+}
+
+void cgit_print_submodule_page(char *path, const char *rev)
+{
+	int started = start_error_page(404, "Not Found");
+
+	html("<div class='error'>This path is a submodule: ");
+	cgit_submodule_link("ls-mod", path, rev);
+	html("</div>\n");
+	if (started)
+		cgit_print_layout_end();
 }
 
 void cgit_print_blob_too_large(size_t size)
diff --git a/source/ui-shared.h b/source/ui-shared.hindex fa73c83..e52a3ae 100644--- a/source/ui-shared.h+++ b/source/ui-shared.h@@ -143,6 +143,12 @@ extern void cgit_print_error_page(int code, const char *msg, const char *fmt, .. extern void cgit_print_blob_too_large(size_t size);  /*+ * Answer with the 404 page for a path naming a submodule, whose commit rev+ * lives in another repository, linking it the way a tree listing does.+ */+extern void cgit_print_submodule_page(char *path, const char *rev);++/*  * Resolve rev to the parsed commit it names, peeling a tag, with oid set to  * what rev itself names. Returns NULL once the 404 page naming rev is out.  */
diff --git a/source/ui-shared.h b/source/ui-shared.h
index fa73c83..e52a3ae 100644
--- a/source/ui-shared.h
+++ b/source/ui-shared.h
@@ -143,6 +143,12 @@ extern void cgit_print_error_page(int code, const char *msg, const char *fmt, ..
 extern void cgit_print_blob_too_large(size_t size);
 
 /*
+ * Answer with the 404 page for a path naming a submodule, whose commit rev
+ * lives in another repository, linking it the way a tree listing does.
+ */
+extern void cgit_print_submodule_page(char *path, const char *rev);
+
+/*
  * Resolve rev to the parsed commit it names, peeling a tag, with oid set to
  * what rev itself names. Returns NULL once the 404 page naming rev is out.
  */
diff --git a/source/ui-tree.c b/source/ui-tree.cindex 63b8984..f1b995a 100644--- a/source/ui-tree.c+++ b/source/ui-tree.c@@ -470,6 +470,11 @@ static int walk_tree(const struct object_id *oid, struct strbuf *base, 			strbuf_release(&fullpath); 			ls_head(); 			return READ_TREE_RECURSIVE;+		} else if (S_ISGITLINK(mode)) {+			cgit_print_submodule_page(fullpath.buf, oid_to_hex(oid));+			walk->state = WALK_ERROR_SHOWN;+			strbuf_release(&fullpath);+			return 0; 		} else { 			bool shown = print_object(oid, mode, fullpath.buf, pathname, walk->rev); @@ -524,6 +529,6 @@ void cgit_print_tree(const char *rev, char *path) 	} else if (walk.state == WALK_LOOKING) { 		cgit_print_error_page(404, "Not Found", "Path not found"); 	}-	// WALK_ERROR_SHOWN is left alone, since the error page print_object-	// put out is already complete.+	// WALK_ERROR_SHOWN is left alone, since the error page the walk put+	// out is already complete. }
diff --git a/source/ui-tree.c b/source/ui-tree.c
index 63b8984..f1b995a 100644
--- a/source/ui-tree.c
+++ b/source/ui-tree.c
@@ -470,6 +470,11 @@ static int walk_tree(const struct object_id *oid, struct strbuf *base,
 			strbuf_release(&fullpath);
 			ls_head();
 			return READ_TREE_RECURSIVE;
+		} else if (S_ISGITLINK(mode)) {
+			cgit_print_submodule_page(fullpath.buf, oid_to_hex(oid));
+			walk->state = WALK_ERROR_SHOWN;
+			strbuf_release(&fullpath);
+			return 0;
 		} else {
 			bool shown = print_object(oid, mode, fullpath.buf, pathname, walk->rev);
 
@@ -524,6 +529,6 @@ void cgit_print_tree(const char *rev, char *path)
 	} else if (walk.state == WALK_LOOKING) {
 		cgit_print_error_page(404, "Not Found", "Path not found");
 	}
-	// WALK_ERROR_SHOWN is left alone, since the error page print_object
-	// put out is already complete.
+	// WALK_ERROR_SHOWN is left alone, since the error page the walk put
+	// out is already complete.
 }