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builtin/commit-graph.c: introduce split strategy 'no-merge'

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In the previous commit, we laid the groundwork for supporting different
splitting strategies. In this commit, we introduce the first splitting
strategy: 'no-merge'.

Passing '--split=no-merge' is useful for callers which wish to write a
new incremental commit-graph, but do not want to spend effort condensing
the incremental chain [1]. Previously, this was possible by passing
'--size-multiple=0', but this no longer the case following 63020f175f
(commit-graph: prefer default size_mult when given zero, 2020-01-02).

When '--split=no-merge' is given, the commit-graph machinery will never
condense an existing chain, and it will always write a new incremental.

[1]: This might occur when, for example, a server administrator running
some program after each push may want to ensure that each job runs
proportional in time to the size of the push, and does not "jump" when
the commit-graph machinery decides to trigger a merge.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau
2020-04-13 22:04:12 -06:00
committed by Junio C Hamano
parent 4f027355f6
commit fdbde82fe5
5 changed files with 36 additions and 9 deletions
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7
builtin/commit-graph.c
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@ -118,11 +118,16 @@ static struct split_commit_graph_opts split_opts;
static int write_option_parse_split(const struct option *opt, const char *arg,
int unset)
{
enum commit_graph_split_flags *flags = opt->value;
opts.split = 1;
if (!arg)
return 0;
die(_("unrecognized --split argument, %s"), arg);
if (!strcmp(arg, "no-merge"))
*flags = COMMIT_GRAPH_SPLIT_MERGE_PROHIBITED;
else
die(_("unrecognized --split argument, %s"), arg);
return 0;
}