From: Derrick Stolee <dstolee@microsoft.com>
Date: Tue, 10 Apr 2018 12:56:07 +0000 (-0400)
Subject: commit-graph: build graph from starting commits
X-Git-Tag: v2.18.0-rc0~99^2~1
X-Git-Url: https://git.lorimer.id.au/gitweb.git/diff_plain/3d5df01b5e42416a59e857135e932bbdd8cc3ba0?ds=inline;hp=3d5df01b5e42416a59e857135e932bbdd8cc3ba0

commit-graph: build graph from starting commits

Teach git-commit-graph to read commits from stdin when the
--stdin-commits flag is specified. Commits reachable from these
commits are added to the graph. This is a much faster way to construct
the graph than inspecting all packed objects, but is restricted to
known tips.

For the Linux repository, 700,000+ commits were added to the graph
file starting from 'master' in 7-9 seconds, depending on the number
of packfiles in the repo (1, 24, or 120).

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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