libpriv/core: teach core to use deployment for yum repos

Add a function in the core that knows how to take a deployment and point
its passwd dir and libdnf's repos dir to it. We call it the
"configuration deployment", because those are configuration files which
should be inherited from the config merge, not the origin merge.

Prep for `makecache`.

src/daemon/rpmostree-sysroot-upgrader.c

@@ -774,27 +774,9 @@ prepare_context_for_assembly (RpmOstreeSysrootUpgrader *self,
                               GCancellable             *cancellable,
                               GError                  **error)
 {
-  DnfContext *hifctx = rpmostree_context_get_hif (self->ctx);
-
-  const char *sysroot_path =
-    gs_file_get_path_cached (ostree_sysroot_get_path (self->sysroot));
-  g_autofree char *merge_deployment_dirpath =
-    ostree_sysroot_get_deployment_dirpath (self->sysroot,
-                                           self->cfg_merge_deployment);
-  g_autofree char *merge_deployment_root =
-    g_build_filename (sysroot_path, merge_deployment_dirpath, NULL);
-
-  g_autofree char *reposdir = g_build_filename (merge_deployment_root,
-                                                "etc/yum.repos.d", NULL);
-  g_autofree char *passwddir = g_build_filename (merge_deployment_root,
-                                                 "etc", NULL);
-
-  /* point libhif to the yum.repos.d and os-release of the merge deployment */
-  dnf_context_set_repo_dir (hifctx, reposdir);
-  dnf_context_set_source_root (hifctx, tmprootfs);
-
-  /* point the core to the passwd & group of the merge deployment */
-  rpmostree_context_set_passwd_dir (self->ctx, passwddir);
+  /* make sure yum repos and passwd used are from our cfg merge */
+  rpmostree_context_configure_from_deployment (self->ctx, self->sysroot,
+                                               self->cfg_merge_deployment);
 
   /* load the sepolicy to use during import */
   glnx_unref_object OstreeSePolicy *sepolicy = NULL;

src/libpriv/rpmostree-core.c

@@ -403,6 +403,28 @@ rpmostree_context_ensure_tmpdir (RpmOstreeContext *self,
   return TRUE;
 }
 
+/* Pick up repos dir and passwd from @cfg_deployment. */
+void
+rpmostree_context_configure_from_deployment (RpmOstreeContext *self,
+                                             OstreeSysroot    *sysroot,
+                                             OstreeDeployment *cfg_deployment)
+{
+  const char *sysroot_path = gs_file_get_path_cached (ostree_sysroot_get_path (sysroot));
+  g_autofree char *cfg_deployment_dirpath =
+    ostree_sysroot_get_deployment_dirpath (sysroot, cfg_deployment);
+  g_autofree char *cfg_deployment_root =
+    g_build_filename (sysroot_path, cfg_deployment_dirpath, NULL);
+
+  g_autofree char *reposdir = g_build_filename (cfg_deployment_root, "etc/yum.repos.d", NULL);
+
+  /* point libhif to the yum.repos.d and os-release of the merge deployment */
+  dnf_context_set_repo_dir (self->hifctx, reposdir);
+
+  /* point the core to the passwd & group of the merge deployment */
+  g_assert (!self->passwd_dir);
+  self->passwd_dir = g_build_filename (cfg_deployment_root, "etc", NULL);
+}
+
 /* Use this if no packages will be installed, and we just want a "dummy" run.
  */
 void
@@ -438,14 +460,6 @@ rpmostree_context_set_sepolicy (RpmOstreeContext *self,
   g_set_object (&self->sepolicy, sepolicy);
 }
 
-void
-rpmostree_context_set_passwd_dir (RpmOstreeContext *self,
-                                  const char *passwd_dir)
-{
-  g_clear_pointer (&self->passwd_dir, g_free);
-  self->passwd_dir = g_strdup (passwd_dir);
-}
-
 DnfContext *
 rpmostree_context_get_hif (RpmOstreeContext *self)
 {

src/libpriv/rpmostree-core.h

@@ -60,15 +60,18 @@ gboolean rpmostree_context_setup (RpmOstreeContext     *self,
                                   GCancellable  *cancellable,
                                   GError       **error);
 
+void
+rpmostree_context_configure_from_deployment (RpmOstreeContext *self,
+                                             OstreeSysroot    *sysroot,
+                                             OstreeDeployment *cfg_deployment);
+
 void rpmostree_context_set_is_empty (RpmOstreeContext *self);
 
 void rpmostree_context_set_repos (RpmOstreeContext *self,
                                   OstreeRepo       *base_repo,
                                   OstreeRepo       *pkgcache_repo);
 void rpmostree_context_set_sepolicy (RpmOstreeContext *self,
                                      OstreeSePolicy   *sepolicy);
-void rpmostree_context_set_passwd_dir (RpmOstreeContext *self,
-                                       const char *passwd_dir);
 
 void rpmostree_dnf_add_checksum_goal (GChecksum *checksum, HyGoal goal);
 char *rpmostree_context_get_state_sha512 (RpmOstreeContext *self);