> Teach Git to write a commit graph file by checking all packed objects
> to see if they are commits, then store the file in the given pack
> directory.
I'm afraid that scanning all packed objects is a bit of a roundabout
way to approach this.
In my git repo, with 9 pack files at the moment, i.e. not that big a
repo and not that many pack files:
$ time ./git commit-graph --write --update-head
4df41a3d1cc408b7ad34bea87b51ec4ccbf4b803
real 0m27.550s
user 0m27.113s
sys 0m0.376s
In comparison, performing a good old revision walk to gather all the
info that is written into the graph file:
$ time git log --all --topo-order --format='%H %T %P %cd' |wc -l
52954
real 0m0.903s
user 0m0.972s
sys 0m0.058s
> +char* get_commit_graph_filename_hash(const char *pack_dir,
> + struct object_id *hash)
> +{
> + size_t len;
> + struct strbuf head_path = STRBUF_INIT;
> + strbuf_addstr(&head_path, pack_dir);
> + strbuf_addstr(&head_path, "/graph-");
> + strbuf_addstr(&head_path, oid_to_hex(hash));
> + strbuf_addstr(&head_path, ".graph");
Nit: this is assembling the path of a graph file, not that of a
graph-head, so the strbuf should be renamed accordingly.
> +
> + return strbuf_detach(&head_path, &len);
> +}
