On Thu, Mar 31, 2016 at 10:43:48AM -0700, Junio C Hamano wrote:
>Xiaolong Ye <xiaolong.ye@xxxxxxxxx> writes:
>
>> Introduce --base=auto to record the base commit info automatically, the base_commit
>> will be the merge base of tip commit of the upstream branch and revision-range
>> specified in cmdline.
>
>This line is probably a bit too long.
How about simplifying it to "the base_commit is the merge base of upstream and
specified revision-range."?
>
>>
>> Helped-by: Junio C Hamano <gitster@xxxxxxxxx>
>> Helped-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
>> Signed-off-by: Xiaolong Ye <xiaolong.ye@xxxxxxxxx>
>> ---
>> Documentation/git-format-patch.txt | 4 ++++
>> builtin/log.c | 31 +++++++++++++++++++++++++++----
>> 2 files changed, 31 insertions(+), 4 deletions(-)
>>
>> diff --git a/Documentation/git-format-patch.txt b/Documentation/git-format-patch.txt
>> index 067d562..d8fe651 100644
>> --- a/Documentation/git-format-patch.txt
>> +++ b/Documentation/git-format-patch.txt
>> @@ -290,6 +290,10 @@ you can use `--suffix=-patch` to get `0001-description-of-my-change-patch`.
>> patches for A, B and C, and the identifiers for P, X, Y, Z are appended
>> at the end of the _first_ message.
>>
>> + If set '--base=auto' in cmdline, it will track base commit automatically,
>> + the base commit will be the merge base of tip commit of the remote-tracking
>> + branch and revision-range specified in cmdline.
>> +
>> --root::
>> Treat the revision argument as a <revision range>, even if it
>> is just a single commit (that would normally be treated as a
>> diff --git a/builtin/log.c b/builtin/log.c
>> index 03cbab0..c5efe73 100644
>> --- a/builtin/log.c
>> +++ b/builtin/log.c
>> @@ -1200,6 +1200,9 @@ static void prepare_bases(struct base_tree_info *bases,
>> struct rev_info revs;
>> struct diff_options diffopt;
>> struct object_id *patch_id;
>> + struct branch *curr_branch;
>> + struct commit_list *base_list;
>> + const char *upstream;
>> unsigned char sha1[20];
>> int i;
>>
>> @@ -1207,10 +1210,30 @@ static void prepare_bases(struct base_tree_info *bases,
>> DIFF_OPT_SET(&diffopt, RECURSIVE);
>> diff_setup_done(&diffopt);
>>
>> - base = lookup_commit_reference_by_name(base_commit);
>> - if (!base)
>> - die(_("Unknown commit %s"), base_commit);
>> - oidcpy(&bases->base_commit, &base->object.oid);
>> + if (!strcmp(base_commit, "auto")) {
>> + curr_branch = branch_get(NULL);
>
>Can branch_get() return NULL? Which ...
>
>> + upstream = branch_get_upstream(curr_branch, NULL);
>
>... would cause branch_get_upstream() to give you an error (which
>you ignore)? I guess that is OK because upstream will safely be set
>to NULL in that case.
>
Yes, branch_get_upstream(curr_branch, NULL) will safely return NULL if curr_branch
is NULL, so I think there is no need to add error handling for branch_get().
>> + if (upstream) {
>> + if (get_sha1(upstream, sha1))
>> + die(_("Failed to resolve '%s' as a valid ref."), upstream);
>> + commit = lookup_commit_or_die(sha1, "upstream base");
>> + base_list = get_merge_bases_many(commit, total, list);
>> + if (!bases)
>> + die(_("Could not find merge base."));
>> + base = base_list->item;
>> + free_commit_list(base_list);
>
>What should happen when there are multiple merge bases? The code
>picks one at random and ignores the remainder, if I am reading this
>correctly.
If there is more than one merge base, commits in base_list should be sorted by date,
if I am understanding it correctly, so base_list->item should be the lastest
merge base commit, it should be enough for us to used as base commit.
Thanks,
Xiaolong.
>
>> + oidcpy(&bases->base_commit, &base->object.oid);
>> + } else {
>> + die(_("Failed to get upstream, if you want to record base commit automatically,\n"
>> + "please use git branch --set-upstream-to to track a remote branch.\n"
>> + "Or you could specify base commit by --base=<base-commit-id> manually."));
>> + }
>> + } else {
>> + base = lookup_commit_reference_by_name(base_commit);
>> + if (!base)
>> + die(_("Unknown commit %s"), base_commit);
>> + oidcpy(&bases->base_commit, &base->object.oid);
>> + }
>>
>> init_revisions(&revs, NULL);
>> revs.max_parents = 1;
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