On 10/14/2018 10:19 PM, brian m. carlson wrote:
Since the commit-graph code wants to serialize the hash algorithm into
the data store, specify a version number for each supported algorithm.
Note that we don't use the values of the constants themselves, as they
are internal and could change in the future.

Signed-off-by: brian m. carlson <sand...@crustytoothpaste.net>
---
  commit-graph.c | 9 ++++++++-
  1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/commit-graph.c b/commit-graph.c
index 7a28fbb03f..e587c21bb6 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -45,7 +45,14 @@ char *get_commit_graph_filename(const char *obj_dir)
static uint8_t oid_version(void)
  {
-       return 1;
+       switch (hash_algo_by_ptr(the_hash_algo)) {
+               case GIT_HASH_SHA1:
+                       return 1;
+               case GIT_HASH_SHA256:
+                       return 2;
+               default:
+                       BUG("unknown hash algorithm");
+       }
  }
static struct commit_graph *alloc_commit_graph(void)
Simple and easy!

Thanks,
-Stolee

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