Commit 67a39a4c99

@@ -352,8 +352,9 @@ Error cache_hit(CacheHash *ch, Buf *out_digest) {
         // if the mtime matches we can trust the digest
         OsFile this_file;
         if ((err = os_file_open_r(chf->path, &this_file))) {
+            fprintf(stderr, "Unable to open %s\n: %s", buf_ptr(chf->path), err_str(err));
             os_file_close(ch->manifest_file);
-            return err;
+            return ErrorCacheUnavailable;
         }
         OsTimeStamp actual_mtime;
         if ((err = os_file_mtime(this_file, &actual_mtime))) {
@@ -392,8 +393,9 @@ Error cache_hit(CacheHash *ch, Buf *out_digest) {
         for (; file_i < input_file_count; file_i += 1) {
             CacheHashFile *chf = &ch->files.at(file_i);
             if ((err = populate_file_hash(ch, chf, nullptr))) {
+                fprintf(stderr, "Unable to hash %s: %s\n", buf_ptr(chf->path), err_str(err));
                 os_file_close(ch->manifest_file);
-                return err;
+                return ErrorCacheUnavailable;
             }
         }
         return ErrorNone;

@@ -129,6 +129,11 @@ CodeGen *codegen_create(Buf *root_src_path, const ZigTarget *target, OutType out
         Buf *src_dir = buf_alloc();
         os_path_split(root_src_path, src_dir, src_basename);
 
+        if (buf_len(src_basename) == 0) {
+            fprintf(stderr, "Invalid root source path: %s\n", buf_ptr(root_src_path));
+            exit(1);
+        }
+
         g->root_package = new_package(buf_ptr(src_dir), buf_ptr(src_basename));
         g->std_package = new_package(buf_ptr(g->zig_std_dir), "index.zig");
         g->root_package->package_table.put(buf_create_from_str("std"), g->std_package);
@@ -8178,7 +8183,11 @@ void codegen_build_and_link(CodeGen *g) {
         os_path_join(stage1_dir, buf_create_from_str("build"), manifest_dir);
 
         if ((err = check_cache(g, manifest_dir, &digest))) {
-            fprintf(stderr, "Unable to check cache: %s\n", err_str(err));
+            if (err == ErrorCacheUnavailable) {
+                // message already printed
+            } else {
+                fprintf(stderr, "Unable to check cache: %s\n", err_str(err));
+            }
             exit(1);
         }
 

@@ -33,6 +33,7 @@ const char *err_str(Error err) {
         case ErrorSharingViolation: return "sharing violation";
         case ErrorPipeBusy: return "pipe busy";
         case ErrorPrimitiveTypeNotFound: return "primitive type not found";
+        case ErrorCacheUnavailable: return "cache unavailable";
     }
     return "(invalid error)";
 }

@@ -35,6 +35,7 @@ enum Error {
     ErrorSharingViolation,
     ErrorPipeBusy,
     ErrorPrimitiveTypeNotFound,
+    ErrorCacheUnavailable,
 };
 
 const char *err_str(Error err);

@@ -188,14 +188,20 @@ void os_path_split(Buf *full_path, Buf *out_dirname, Buf *out_basename) {
     size_t len = buf_len(full_path);
     if (len != 0) {
         size_t last_index = len - 1;
-        if (os_is_sep(buf_ptr(full_path)[last_index])) {
+        char last_char = buf_ptr(full_path)[last_index];
+        if (os_is_sep(last_char)) {
+            if (last_index == 0) {
+                if (out_dirname) buf_init_from_mem(out_dirname, &last_char, 1);
+                if (out_basename) buf_init_from_str(out_basename, "");
+                return;
+            }
             last_index -= 1;
         }
         for (size_t i = last_index;;) {
             uint8_t c = buf_ptr(full_path)[i];
             if (os_is_sep(c)) {
                 if (out_dirname) {
-                    buf_init_from_mem(out_dirname, buf_ptr(full_path), i);
+                    buf_init_from_mem(out_dirname, buf_ptr(full_path), (i == 0) ? 1 : i);
                 }
                 if (out_basename) {
                     buf_init_from_mem(out_basename, buf_ptr(full_path) + i + 1, buf_len(full_path) - (i + 1));