Backport a patch to avoid writing to parent repo

This fixes installing via flatpak system helper on systems where the
host fs supports reflinks.

https://github.com/ostreedev/ostree/pull/1524

0001-Don-t-write-to-parent-repo.patch

@@ -0,0 +1,35 @@
+From 28c7bc6d0e153a0b07bdb82d25473a490765067f Mon Sep 17 00:00:00 2001
+From: Alexander Larsson <alexl@redhat.com>
+Date: Thu, 29 Mar 2018 15:19:33 +0200
+Subject: [PATCH] Don't write to parent repo
+
+In _try_clone_from_payload_link, don't try to do the clone in the
+parent repo, because we don't want to modify that. parent repos are
+typically used when you want a shared, immutable base.
+
+For example in flatpak, the parent repo is the system repo which you
+don't have write access to, so any modification to it will fail with
+EACCES, making it impossible to install via the system helper.
+
+Closes: #1524
+Approved by: cgwalters
+---
+ src/libostree/ostree-repo-commit.c | 2 --
+ 1 file changed, 2 deletions(-)
+
+diff --git a/src/libostree/ostree-repo-commit.c b/src/libostree/ostree-repo-commit.c
+index 12c4103dc1d9..7eb5ca93492c 100644
+--- a/src/libostree/ostree-repo-commit.c
++++ b/src/libostree/ostree-repo-commit.c
+@@ -777,8 +777,6 @@ _try_clone_from_payload_link (OstreeRepo   *self,
+           return TRUE;
+         }
+     }
+-  if (self->parent_repo)
+-    return _try_clone_from_payload_link (self->parent_repo, payload_checksum, file_info, tmpf, cancellable, error);
+ 
+   return TRUE;
+ }
+-- 
+2.16.2
+

ostree.spec

@@ -1,8 +1,10 @@
 Summary: Tool for managing bootable, immutable filesystem trees
 Name: ostree
 Version: 2018.3
-Release: 1%{?dist}
+Release: 2%{?dist}
 Source0: https://github.com/ostreedev/%{name}/releases/download/v%{version}/libostree-%{version}.tar.xz
+# Backported from upstream
+Patch0: 0001-Don-t-write-to-parent-repo.patch
 License: LGPLv2+
 URL: https://ostree.readthedocs.io/en/latest/
 
@@ -153,6 +155,9 @@ find %{buildroot} -name '*.la' -delete
 %{_libexecdir}/libostree/ostree-trivial-httpd
 
 %changelog
+* Tue Apr 03 2018 Kalev Lember <klember@redhat.com> - 2018.3-2
+- Backport a patch to avoid writing to parent repo
+
 * Wed Mar 21 2018 Colin Walters <walters@verbum.org> - 2018.3-1
 - https://github.com/ostreedev/ostree/releases/tag/v2018.3