Added route to request desc file; updated builder for new route (fixes #118)

src/build/build.v

@@ -93,7 +93,7 @@ fn build(conf Config) ? {
 			'source PKGBUILD',
 			// The build container checks whether the package is already
 			// present on the server
-			'curl --head --fail $conf.address/$repo.repo/$build_arch/\$pkgname-\$pkgver-\$pkgrel-${build_arch}.pkg.tar.zst && exit 0',
+			'curl --head --fail $conf.address/$repo.repo/$build_arch/\$pkgname-\$pkgver-\$pkgrel && exit 0',
 			'MAKEFLAGS="-j\$(nproc)" makepkg -s --noconfirm --needed && for pkg in \$(ls -1 *.pkg*); do curl -XPOST -T "\$pkg" -H "X-API-KEY: \$API_KEY" $conf.address/$repo.repo/publish; done',
 		]
 

src/server/routes.v

@@ -22,7 +22,9 @@ fn (mut app App) get_repo_file(repo string, arch string, filename string) web.Re
 
 	db_exts := ['.db', '.files', '.db.tar.gz', '.files.tar.gz']
 
-	if db_exts.any(filename.ends_with(it)) {
+	// There's no point in having the ability to serve db archives with wrong
+	// filenames
+	if db_exts.any(filename == '$repo$it') {
 		full_path = os.join_path(app.repo.repos_dir, repo, arch, filename)
 
 		// repo-add does this using symlinks, but we just change the requested
@@ -30,8 +32,14 @@ fn (mut app App) get_repo_file(repo string, arch string, filename string) web.Re
 		if !full_path.ends_with('.tar.gz') {
 			full_path += '.tar.gz'
 		}
-	} else {
+	} else if filename.contains('.pkg') {
 		full_path = os.join_path_single(app.repo.pkg_dir, filename)
+
+	// Default behavior is to return the desc file for the package, if present.
+	// This can then also be used by the build system to properly check whether
+	// a package is present in an arch-repo.
+	} else {
+		full_path = os.join_path(app.repo.repos_dir, repo, arch, filename, 'desc')
 	}
 
 	// Scuffed way to respond to HEAD requests