merge-base --independent to print reduced parent list in a merge
While show-branch --independent does not support more than MAX_REVS revs, git internally supports more with a different algorithm. Expose that functionality as "git merge-base --independent". This should help scripts to catch up with builtin merge in supporting dodecapus. Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
parent
aa8f98c1bf
commit
a1e0ad78b7
@ -8,7 +8,9 @@ git-merge-base - Find as good common ancestors as possible for a merge
|
||||
|
||||
SYNOPSIS
|
||||
--------
|
||||
[verse]
|
||||
'git merge-base' [-a|--all] [--octopus] <commit> <commit>...
|
||||
'git merge-base' --independent <commit>...
|
||||
|
||||
DESCRIPTION
|
||||
-----------
|
||||
@ -42,6 +44,13 @@ OPTIONS
|
||||
in preparation for an n-way merge. This mimics the behavior
|
||||
of 'git show-branch --merge-base'.
|
||||
|
||||
--independent::
|
||||
Instead of printing merge bases, print a minimal subset of
|
||||
the supplied commits with the same ancestors. In other words,
|
||||
among the commits given, list those which cannot be reached
|
||||
from any other. This mimics the behavior of 'git show-branch
|
||||
--independent'.
|
||||
|
||||
DISCUSSION
|
||||
----------
|
||||
|
||||
|
@ -24,6 +24,7 @@ static int show_merge_base(struct commit **rev, int rev_nr, int show_all)
|
||||
|
||||
static const char * const merge_base_usage[] = {
|
||||
"git merge-base [-a|--all] [--octopus] <commit> <commit>...",
|
||||
"git merge-base --independent <commit>...",
|
||||
NULL
|
||||
};
|
||||
|
||||
@ -41,15 +42,19 @@ static struct commit *get_commit_reference(const char *arg)
|
||||
return r;
|
||||
}
|
||||
|
||||
static int show_octopus_merge_bases(int count, const char **args, int show_all)
|
||||
static int handle_octopus(int count, const char **args, int reduce, int show_all)
|
||||
{
|
||||
struct commit_list *revs = NULL;
|
||||
struct commit_list *result;
|
||||
int i;
|
||||
|
||||
for (i = count - 1; i >= 0; i++)
|
||||
if (reduce)
|
||||
show_all = 1;
|
||||
|
||||
for (i = count - 1; i >= 0; i--)
|
||||
commit_list_insert(get_commit_reference(args[i]), &revs);
|
||||
result = get_octopus_merge_bases(revs);
|
||||
|
||||
result = reduce ? reduce_heads(revs) : get_octopus_merge_bases(revs);
|
||||
|
||||
if (!result)
|
||||
return 1;
|
||||
@ -70,20 +75,24 @@ int cmd_merge_base(int argc, const char **argv, const char *prefix)
|
||||
int rev_nr = 0;
|
||||
int show_all = 0;
|
||||
int octopus = 0;
|
||||
int reduce = 0;
|
||||
|
||||
struct option options[] = {
|
||||
OPT_BOOLEAN('a', "all", &show_all, "output all common ancestors"),
|
||||
OPT_BOOLEAN(0, "octopus", &octopus, "find ancestors for a single n-way merge"),
|
||||
OPT_BOOLEAN(0, "independent", &reduce, "list revs not reachable from others"),
|
||||
OPT_END()
|
||||
};
|
||||
|
||||
git_config(git_default_config, NULL);
|
||||
argc = parse_options(argc, argv, prefix, options, merge_base_usage, 0);
|
||||
if (!octopus && argc < 2)
|
||||
if (!octopus && !reduce && argc < 2)
|
||||
usage_with_options(merge_base_usage, options);
|
||||
if (reduce && (show_all || octopus))
|
||||
die("--independent cannot be used with other options");
|
||||
|
||||
if (octopus)
|
||||
return show_octopus_merge_bases(argc, argv, show_all);
|
||||
if (octopus || reduce)
|
||||
return handle_octopus(argc, argv, reduce, show_all);
|
||||
|
||||
rev = xmalloc(argc * sizeof(*rev));
|
||||
while (argc-- > 0)
|
||||
|
@ -3,7 +3,7 @@
|
||||
# Copyright (c) 2005 Junio C Hamano
|
||||
#
|
||||
|
||||
test_description='Merge base computation.
|
||||
test_description='Merge base and parent list computation.
|
||||
'
|
||||
|
||||
. ./test-lib.sh
|
||||
@ -75,6 +75,26 @@ test_expect_success 'merge-base G H' '
|
||||
test_cmp expected actual.sb
|
||||
'
|
||||
|
||||
test_expect_success 'merge-base/show-branch --independent' '
|
||||
git name-rev "$H" >expected1 &&
|
||||
git name-rev "$H" "$G" >expected2 &&
|
||||
|
||||
parents=$(git merge-base --independent H) &&
|
||||
git name-rev $parents >actual1.mb &&
|
||||
parents=$(git merge-base --independent A H G) &&
|
||||
git name-rev $parents >actual2.mb &&
|
||||
|
||||
parents=$(git show-branch --independent H) &&
|
||||
git name-rev $parents >actual1.sb &&
|
||||
parents=$(git show-branch --independent A H G) &&
|
||||
git name-rev $parents >actual2.sb &&
|
||||
|
||||
test_cmp expected1 actual1.mb &&
|
||||
test_cmp expected2 actual2.mb &&
|
||||
test_cmp expected1 actual1.sb &&
|
||||
test_cmp expected2 actual2.sb
|
||||
'
|
||||
|
||||
test_expect_success 'unsynchronized clocks' '
|
||||
# This test is to demonstrate that relying on timestamps in a distributed
|
||||
# SCM to provide a _consistent_ partial ordering of commits leads to
|
||||
@ -125,6 +145,23 @@ test_expect_success 'unsynchronized clocks' '
|
||||
test_cmp expected actual.all
|
||||
'
|
||||
|
||||
test_expect_success '--independent with unsynchronized clocks' '
|
||||
IB=$(doit 0 IB) &&
|
||||
I1=$(doit -10 I1 $IB) &&
|
||||
I2=$(doit -9 I2 $I1) &&
|
||||
I3=$(doit -8 I3 $I2) &&
|
||||
I4=$(doit -7 I4 $I3) &&
|
||||
I5=$(doit -6 I5 $I4) &&
|
||||
I6=$(doit -5 I6 $I5) &&
|
||||
I7=$(doit -4 I7 $I6) &&
|
||||
I8=$(doit -3 I8 $I7) &&
|
||||
IH=$(doit -2 IH $I8) &&
|
||||
|
||||
echo $IH >expected &&
|
||||
git merge-base --independent IB IH >actual &&
|
||||
test_cmp expected actual
|
||||
'
|
||||
|
||||
test_expect_success 'merge-base for octopus-step (setup)' '
|
||||
# Another set to demonstrate base between one commit and a merge
|
||||
# in the documentation.
|
||||
|
Loading…
Reference in New Issue
Block a user