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git notes merge: Add automatic conflict resolvers (ours, theirs, union)

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The new -s/--strategy command-line option to 'git notes merge' allow the user
to choose how notes merge conflicts should be resolved. There are four valid
strategies to choose from:

1. "manual" (the default): This will let the user manually resolve conflicts.
   This option currently fails with an error message. It will be implemented
   properly in future patches.

2. "ours": This automatically chooses the local version of a conflict, and
   discards the remote version.

3. "theirs": This automatically chooses the remote version of a conflict, and
   discards the local version.

4. "union": This automatically resolves the conflict by appending the remote
   version to the local version.

The strategies are implemented using the combine_notes_* functions from the
notes.h API.

The patch also includes testcases verifying the correct implementation of
these strategies.

This patch has been improved by the following contributions:
- Jonathan Nieder: Future-proof by always checking add_note() return value
- Stephen Boyd: Use test_commit
- Stephen Boyd: Use correct option name

Thanks-to: Jonathan Nieder <jrnieder@gmail.com>
Thanks-to: Stephen Boyd <bebarino@gmail.com>
Signed-off-by: Johan Herland <johan@herland.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johan Herland
2010-11-15 00:55:12 +01:00
committed by Junio C Hamano
parent 2085b16aef
commit 3228e67120
4 changed files with 559 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
builtin/notes.c
View File

@ -26,7 +26,7 @@ static const char * const git_notes_usage[] = {
"git notes [--ref <notes_ref>] append [-m <msg> | -F <file> | (-c | -C) <object>] [<object>]",
"git notes [--ref <notes_ref>] edit [<object>]",
"git notes [--ref <notes_ref>] show [<object>]",
"git notes [--ref <notes_ref>] merge [-v | -q] <notes_ref>",
"git notes [--ref <notes_ref>] merge [-v | -q] [-s <strategy> ] <notes_ref>",
"git notes [--ref <notes_ref>] remove [<object>]",
"git notes [--ref <notes_ref>] prune [-n | -v]",
NULL
@ -768,8 +768,12 @@ static int merge(int argc, const char **argv, const char *prefix)
struct notes_tree *t;
struct notes_merge_options o;
int verbosity = 0, result;
const char *strategy = NULL;
struct option options[] = {
OPT__VERBOSITY(&verbosity),
OPT_STRING('s', "strategy", &strategy, "strategy",
"resolve notes conflicts using the given "
"strategy (manual/ours/theirs/union)"),
OPT_END()
};
@ -789,6 +793,21 @@ static int merge(int argc, const char **argv, const char *prefix)
expand_notes_ref(&remote_ref);
o.remote_ref = remote_ref.buf;
if (strategy) {
if (!strcmp(strategy, "manual"))
o.strategy = NOTES_MERGE_RESOLVE_MANUAL;
else if (!strcmp(strategy, "ours"))
o.strategy = NOTES_MERGE_RESOLVE_OURS;
else if (!strcmp(strategy, "theirs"))
o.strategy = NOTES_MERGE_RESOLVE_THEIRS;
else if (!strcmp(strategy, "union"))
o.strategy = NOTES_MERGE_RESOLVE_UNION;
else {
error("Unknown -s/--strategy: %s", strategy);
usage_with_options(git_notes_merge_usage, options);
}
}
t = init_notes_check("merge");
strbuf_addf(&msg, "notes: Merged notes from %s into %s",