new: cleaning up functions, base implementation of install function

src/package/package.c

@@ -2,9 +2,12 @@
 #include "../../include/error.h"
 #include "../../include/types.h"
 #include "../../include/mptp.h"
+#include "../../include/util.h"
 
+#include <errno.h>
 #include <strings.h>
 #include <stdlib.h>
+#include <unistd.h>
 
 lm_pkg_t *lm_package_new(){
   lm_pkg_t *pkg = malloc(sizeof(lm_pkg_t));
@@ -16,6 +19,34 @@ void lm_package_init(lm_pkg_t *pkg){
   bzero(pkg, sizeof(lm_pkg_t));
 }
 
+bool lm_package_downloaded(lm_pkg_t *pkg){
+  if(lm_package_path_is_empty(pkg)){
+    lm_error_set(LM_ERR_PkgPathsEmpty);
+    return false;
+  }
+
+  if(!exists(pkg->paths.archive) || !exists(pkg->paths.signature)){
+    lm_error_set(LM_ERR_PkgNotDownloaded);
+    return false;
+  }
+
+  return true;
+}
+
+bool lm_package_remove_download(lm_pkg_t *pkg){
+  if(unlink(pkg->paths.archive) < 0 && errno != ENOENT){
+    lm_error_set(LM_ERR_PkgRemoveDownloadFail);
+    return false;
+  }
+
+  if(unlink(pkg->paths.signature) < 0 && errno != ENOENT){
+    lm_error_set(LM_ERR_PkgRemoveDownloadFail);
+    return false;
+  }
+
+  return true;
+}
+
 void lm_package_free(lm_pkg_t *pkg){
   lm_package_data_free(pkg);
   bzero(pkg, sizeof(lm_pkg_t));

src/package/verify.c

@@ -11,10 +11,9 @@ bool lm_package_verify(lm_pkg_t *pkg){
     return false;
   }
 
-  if(lm_package_path_is_empty(pkg)){
-    lm_error_set(LM_ERR_PkgPathsEmpty);
+  // error set by function
+  if(!lm_package_downloaded(pkg))
     return false;
-  }
 
   gpgme_data_t          sig = NULL, text = NULL;
   gpgme_ctx_t           ctx = NULL;