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merge-ort: handle directory/file conflicts that remain

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When a directory/file conflict remains, we can leave the directory where
it is, but need to move the information about the file to a different
pathname.  After moving the file to a different pathname, we allow
subsequent process_entry() logic to handle any additional details that
might be relevant.

This depends on a new helper function, unique_path(), that dies with an
unimplemented error currently but will be implemented in a subsequent
commit.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Elijah Newren 2021-01-01 02:34:40 +00:00 committed by Junio C Hamano
parent 0ccfa4e5d8
commit 23366d2aa9
1 changed files with 84 additions and 2 deletions
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86
merge-ort.c
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@ -343,6 +343,13 @@ static void path_msg(struct merge_options *opt,
strbuf_addch(sb, '\n');
}
static char *unique_path(struct strmap *existing_paths,
const char *path,
const char *branch)
{
die("Not yet implemented.");
}
/*** Function Grouping: functions related to collect_merge_info() ***/
static void setup_path_info(struct merge_options *opt,
@ -962,6 +969,8 @@ static void process_entry(struct merge_options *opt,
struct conflict_info *ci,
struct directory_versions *dir_metadata)
{
int df_file_index = 0;
VERIFY_CI(ci);
assert(ci->filemask >= 0 && ci->filemask <= 7);
/* ci->match_mask == 7 was handled in collect_merge_info_callback() */
@ -998,13 +1007,86 @@ static void process_entry(struct merge_options *opt,
oidcpy(&ci->stages[i].oid, &null_oid);
}
} else if (ci->df_conflict && ci->merged.result.mode != 0) {
die("Not yet implemented.");
/*
* This started out as a D/F conflict, and the entries in
* the competing directory were not removed by the merge as
* evidenced by write_completed_directory() writing a value
* to ci->merged.result.mode.
*/
struct conflict_info *new_ci;
const char *branch;
const char *old_path = path;
int i;
assert(ci->merged.result.mode == S_IFDIR);
/*
* If filemask is 1, we can just ignore the file as having
* been deleted on both sides. We do not want to overwrite
* ci->merged.result, since it stores the tree for all the
* files under it.
*/
if (ci->filemask == 1) {
ci->filemask = 0;
return;
}
/*
* This file still exists on at least one side, and we want
* the directory to remain here, so we need to move this
* path to some new location.
*/
new_ci = xcalloc(1, sizeof(*new_ci));
/* We don't really want new_ci->merged.result copied, but it'll
* be overwritten below so it doesn't matter. We also don't
* want any directory mode/oid values copied, but we'll zero
* those out immediately. We do want the rest of ci copied.
*/
memcpy(new_ci, ci, sizeof(*ci));
new_ci->match_mask = (new_ci->match_mask & ~new_ci->dirmask);
new_ci->dirmask = 0;
for (i = MERGE_BASE; i <= MERGE_SIDE2; i++) {
if (new_ci->filemask & (1 << i))
continue;
/* zero out any entries related to directories */
new_ci->stages[i].mode = 0;
oidcpy(&new_ci->stages[i].oid, &null_oid);
}
/*
* Find out which side this file came from; note that we
* cannot just use ci->filemask, because renames could cause
* the filemask to go back to 7. So we use dirmask, then
* pick the opposite side's index.
*/
df_file_index = (ci->dirmask & (1 << 1)) ? 2 : 1;
branch = (df_file_index == 1) ? opt->branch1 : opt->branch2;
path = unique_path(&opt->priv->paths, path, branch);
strmap_put(&opt->priv->paths, path, new_ci);
path_msg(opt, path, 0,
_("CONFLICT (file/directory): directory in the way "
"of %s from %s; moving it to %s instead."),
old_path, branch, path);
/*
* Zero out the filemask for the old ci. At this point, ci
* was just an entry for a directory, so we don't need to
* do anything more with it.
*/
ci->filemask = 0;
/*
* Now note that we're working on the new entry (path was
* updated above.
*/
ci = new_ci;
}
/*
* NOTE: Below there is a long switch-like if-elseif-elseif... block
* which the code goes through even for the df_conflict cases
* above. Well, it will once we don't die-not-implemented above.
* above.
*/
if (ci->match_mask) {
ci->merged.clean = 1;