[ostree] repo: Check for OSTREE_REPO in ostree_repo_new_default()

[Matthew Barnes <mbarnes src gnome org>]

commit 5aa0d51d7a55c48aa986ddbacbeb74e224c2be72
Author: Matthew Barnes <mbarnes redhat com>
Date:   Thu Feb 19 10:30:25 2015 -0500

    repo: Check for OSTREE_REPO in ostree_repo_new_default()
    
    Convenience feature to avoid having to pass --repo options repeatedly.
    
    Before falling back to the default system repository path, check for a
    repository path defined by the OSTREE_REPO environment variable.

 doc/ostree.repo.xml         |    6 ++++--
 src/libostree/ostree-repo.c |   14 +++++++++++---
 2 files changed, 15 insertions(+), 5 deletions(-)
---
diff --git a/doc/ostree.repo.xml b/doc/ostree.repo.xml
index eb9e329..b8ad405 100644
--- a/doc/ostree.repo.xml
+++ b/doc/ostree.repo.xml
@@ -70,8 +70,10 @@
                <para>
                  There is a system repository located at
                  <filename>/ostree/repo</filename>.  If no repository
-                 is specified, the <command>ostree</command> as well
-                 as many API calls will use it by default.
+                 is specified -- either by a command-line option or the
+                 <envar>OSTREE_REPO</envar> environment variable --
+                 the <command>ostree</command> as well as many API
+                 calls will use it by default.
                </para>
         </refsect1>
 
diff --git a/src/libostree/ostree-repo.c b/src/libostree/ostree-repo.c
index 85792d8..62fff9e 100644
--- a/src/libostree/ostree-repo.c
+++ b/src/libostree/ostree-repo.c
@@ -511,7 +511,8 @@ get_default_repo_path (void)
  *
  * If the current working directory appears to be an OSTree
  * repository, create a new #OstreeRepo object for accessing it.
- * Otherwise, use the default system repository located at
+ * Otherwise use the path in the OSTREE_REPO environment variable
+ * (if defined) or else the default system repository located at
  * /ostree/repo.
  *
  * Returns: (transfer full): An accessor object for an OSTree repository located at /ostree/repo
@@ -527,8 +528,15 @@ ostree_repo_new_default (void)
     }
   else
     {
-      gs_unref_object GFile *default_repo_path = get_default_repo_path ();
-      return ostree_repo_new (default_repo_path);
+      const char *envvar = g_getenv ("OSTREE_REPO");
+      gs_unref_object GFile *repo_path = NULL;
+
+      if (envvar == NULL || *envvar == '\0')
+        repo_path = get_default_repo_path ();
+      else
+        repo_path = g_file_new_for_path (envvar);
+
+      return ostree_repo_new (repo_path);
     }
 }