backport trivial commit d94715c to allow building with nix 0.20

coreos-installer-fix-metadata.diff

@@ -0,0 +1,11 @@
+--- coreos-installer-0.7.2/Cargo.toml	2020-10-22T04:20:12+00:00
++++ coreos-installer-0.7.2/Cargo.toml	2021-03-01T19:05:35.070629+00:00
+@@ -74,7 +74,7 @@
+ version = "^0.2"
+ 
+ [dependencies.nix]
+-version = ">= 0.17, < 0.20"
++version = ">= 0.17, < 0.21"
+ 
+ [dependencies.openat-ext]
+ version = "^0.1.4"

rust-coreos-installer.spec

@@ -1,4 +1,4 @@
-# Generated by rust2rpm 13
+# Generated by rust2rpm 16
 %bcond_without check
 %global __cargo_skip_build 0
 # The library is for internal code reuse and is not a public API
@@ -8,14 +8,16 @@
 
 Name:           rust-%{crate}
 Version:        0.7.2
-Release:        4%{?dist}
+Release:        5%{?dist}
 Summary:        Installer for Fedora CoreOS and RHEL CoreOS
 
 # Upstream license specification: Apache-2.0
 License:        ASL 2.0
 URL:            https://crates.io/crates/coreos-installer
 Source:         %{crates_source}
-
+# Initial patched metadata
+# * allow nix 0.20: https://github.com/coreos/coreos-installer/commit/d94715c
+Patch0:         coreos-installer-fix-metadata.diff
 
 ExclusiveArch:  %{rust_arches}
 
@@ -128,6 +130,9 @@ RHEL CoreOS.  It is not needed on other platforms.
 %endif
 
 %changelog
+* Mon Mar 01 2021 Fabio Valentini <decathorpe@gmail.com> - 0.7.2-5
+- Backport trivial commit d94715c to allow building with nix 0.20.
+
 * Wed Jan 27 2021 Fedora Release Engineering <releng@fedoraproject.org> - 0.7.2-4
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild