Explain the internals of rerere as in-code comments, while
sprinkling "NEEDSWORK" comment to highlight iffy bits and
questionable assumptions.
This covers the codepath that implements "rerere forget".
Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
---
rerere.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/rerere.c b/rerere.c
index 3d9c33b..3782be6 100644
--- a/rerere.c
+++ b/rerere.c
@@ -413,6 +413,10 @@ static int handle_cache(const char *path, unsigned char *sha1, const char *outpu
strbuf_init(&io.input, 0);
strbuf_attach(&io.input, result.ptr, result.size, result.size);
+ /*
+ * Grab the conflict ID and optionally write the original
+ * contents with conflict markers out.
+ */
hunk_no = handle_path(sha1, (struct rerere_io *)&io, marker_size);
strbuf_release(&io.input);
if (io.io.output)
@@ -777,9 +781,15 @@ static int rerere_forget_one_path(const char *path, struct string_list *rr)
int ret;
struct string_list_item *item;
+ /*
+ * Recreate the original conflict from the stages in the
+ * index and compute the conflict ID
+ */
ret = handle_cache(path, sha1, NULL);
if (ret < 1)
return error("Could not parse conflict hunks in '%s'", path);
+
+ /* Nuke the recorded resolution for the conflict */
hex = xstrdup(sha1_to_hex(sha1));
filename = rerere_path(hex, "postimage");
if (unlink(filename))
@@ -787,9 +797,18 @@ static int rerere_forget_one_path(const char *path, struct string_list *rr)
? error("no remembered resolution for %s", path)
: error("cannot unlink %s: %s", filename, strerror(errno)));
+ /*
+ * Update the preimage so that the user can resolve the
+ * conflict in the working tree, run us again to record
+ * the postimage.
+ */
handle_cache(path, sha1, rerere_path(hex, "preimage"));
fprintf(stderr, "Updated preimage for '%s'\n", path);
+ /*
+ * And remember that we can record resolution for this
+ * conflict when the user is done.
+ */
item = string_list_insert(rr, path);
free(item->util);
item->util = hex;
@@ -808,6 +827,11 @@ int rerere_forget(struct pathspec *pathspec)
fd = setup_rerere(&merge_rr, RERERE_NOAUTOUPDATE);
+ /*
+ * The paths may have been resolved (incorrectly);
+ * recover the original conflicted state and then
+ * find the conflicted paths.
+ */
unmerge_cache(pathspec);
find_conflict(&conflict);
for (i = 0; i < conflict.nr; i++) {
--
2.5.0-rc2-340-g0cccc16
--
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