The commit graph feature is controlled by the new core.commitgraph config
setting. This defaults to 0, so the feature is opt-in.

The intention of core.commitgraph is that a user can always stop checking
for or parsing commit graph files if core.commitgraph=0.

Signed-off-by: Derrick Stolee <dsto...@microsoft.com>
---
 Documentation/config.txt | 3 +++
 cache.h                  | 1 +
 config.c                 | 5 +++++
 environment.c            | 1 +
 4 files changed, 10 insertions(+)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 0e25b2c92b..5b63559a2b 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -898,6 +898,9 @@ core.notesRef::
 This setting defaults to "refs/notes/commits", and it can be overridden by
 the `GIT_NOTES_REF` environment variable.  See linkgit:git-notes[1].
 
+core.commitgraph::
+       Enable git commit graph feature. Allows reading from .graph files.
+
 core.sparseCheckout::
        Enable "sparse checkout" feature. See section "Sparse checkout" in
        linkgit:git-read-tree[1] for more information.
diff --git a/cache.h b/cache.h
index d8b975a571..e50e447a4f 100644
--- a/cache.h
+++ b/cache.h
@@ -825,6 +825,7 @@ extern char *git_replace_ref_base;
 extern int fsync_object_files;
 extern int core_preload_index;
 extern int core_apply_sparse_checkout;
+extern int core_commitgraph;
 extern int precomposed_unicode;
 extern int protect_hfs;
 extern int protect_ntfs;
diff --git a/config.c b/config.c
index e617c2018d..99153fcfdb 100644
--- a/config.c
+++ b/config.c
@@ -1223,6 +1223,11 @@ static int git_default_core_config(const char *var, 
const char *value)
                return 0;
        }
 
+       if (!strcmp(var, "core.commitgraph")) {
+               core_commitgraph = git_config_bool(var, value);
+               return 0;
+       }
+
        if (!strcmp(var, "core.sparsecheckout")) {
                core_apply_sparse_checkout = git_config_bool(var, value);
                return 0;
diff --git a/environment.c b/environment.c
index 63ac38a46f..faa4323cc5 100644
--- a/environment.c
+++ b/environment.c
@@ -61,6 +61,7 @@ enum object_creation_mode object_creation_mode = 
OBJECT_CREATION_MODE;
 char *notes_ref_name;
 int grafts_replace_parents = 1;
 int core_apply_sparse_checkout;
+int core_commitgraph;
 int merge_log_config = -1;
 int precomposed_unicode = -1; /* see probe_utf8_pathname_composition() */
 unsigned long pack_size_limit_cfg;
-- 
2.16.0.15.g9c3cf44.dirty

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