From: Elijah Newren <newren@xxxxxxxxx>
Since some callers may want to send warning messages to somewhere other
than stdout/stderr, stop printing "warning: Cannot merge binary files"
from ll-merge and instead modify the return status of ll_merge() to
indicate when a merge of binary files has occurred. Message printing
probably does not belong in a "low-level merge" anyway.
This commit continues printing the message as-is, just from the callers
instead of within ll_merge(). Future changes will start handling the
message differently in the merge-ort codepath.
There was one special case here: the callers in rerere.c do NOT check
for and print such a message; since those code paths explicitly skip
over binary files, there is no reason to check for a return status of
LL_MERGE_BINARY_CONFLICT or print the related message.
Note that my methodology included first modifying ll_merge() to return
a struct, so that the compiler would catch all the callers for me and
ensure I had modified all of them. After modifying all of them, I then
changed the struct to an enum.
Signed-off-by: Elijah Newren <newren@xxxxxxxxx>
---
apply.c | 5 ++++-
builtin/checkout.c | 12 ++++++++----
ll-merge.c | 40 ++++++++++++++++++++++------------------
ll-merge.h | 9 ++++++++-
merge-blobs.c | 5 ++++-
merge-ort.c | 5 ++++-
merge-recursive.c | 5 ++++-
notes-merge.c | 5 ++++-
rerere.c | 9 +++++----
9 files changed, 63 insertions(+), 32 deletions(-)
diff --git a/apply.c b/apply.c
index 43a0aebf4ee..8079395755f 100644
--- a/apply.c
+++ b/apply.c
@@ -3492,7 +3492,7 @@ static int three_way_merge(struct apply_state *state,
{
mmfile_t base_file, our_file, their_file;
mmbuffer_t result = { NULL };
- int status;
+ enum ll_merge_result status;
/* resolve trivial cases first */
if (oideq(base, ours))
@@ -3509,6 +3509,9 @@ static int three_way_merge(struct apply_state *state,
&their_file, "theirs",
state->repo->index,
NULL);
+ if (status == LL_MERGE_BINARY_CONFLICT)
+ warning("Cannot merge binary files: %s (%s vs. %s)",
+ path, "ours", "theirs");
free(base_file.ptr);
free(our_file.ptr);
free(their_file.ptr);
diff --git a/builtin/checkout.c b/builtin/checkout.c
index cbf73b8c9f6..3a559d69303 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -237,6 +237,7 @@ static int checkout_merged(int pos, const struct checkout *state,
struct cache_entry *ce = active_cache[pos];
const char *path = ce->name;
mmfile_t ancestor, ours, theirs;
+ enum ll_merge_result merge_status;
int status;
struct object_id oid;
mmbuffer_t result_buf;
@@ -267,13 +268,16 @@ static int checkout_merged(int pos, const struct checkout *state,
memset(&ll_opts, 0, sizeof(ll_opts));
git_config_get_bool("merge.renormalize", &renormalize);
ll_opts.renormalize = renormalize;
- status = ll_merge(&result_buf, path, &ancestor, "base",
- &ours, "ours", &theirs, "theirs",
- state->istate, &ll_opts);
+ merge_status = ll_merge(&result_buf, path, &ancestor, "base",
+ &ours, "ours", &theirs, "theirs",
+ state->istate, &ll_opts);
free(ancestor.ptr);
free(ours.ptr);
free(theirs.ptr);
- if (status < 0 || !result_buf.ptr) {
+ if (merge_status == LL_MERGE_BINARY_CONFLICT)
+ warning("Cannot merge binary files: %s (%s vs. %s)",
+ path, "ours", "theirs");
+ if (merge_status < 0 || !result_buf.ptr) {
free(result_buf.ptr);
return error(_("path '%s': cannot merge"), path);
}
diff --git a/ll-merge.c b/ll-merge.c
index 261657578c7..a937cec59a6 100644
--- a/ll-merge.c
+++ b/ll-merge.c
@@ -14,7 +14,7 @@
struct ll_merge_driver;
-typedef int (*ll_merge_fn)(const struct ll_merge_driver *,
+typedef enum ll_merge_result (*ll_merge_fn)(const struct ll_merge_driver *,
mmbuffer_t *result,
const char *path,
mmfile_t *orig, const char *orig_name,
@@ -49,7 +49,7 @@ void reset_merge_attributes(void)
/*
* Built-in low-levels
*/
-static int ll_binary_merge(const struct ll_merge_driver *drv_unused,
+static enum ll_merge_result ll_binary_merge(const struct ll_merge_driver *drv_unused,
mmbuffer_t *result,
const char *path,
mmfile_t *orig, const char *orig_name,
@@ -58,6 +58,7 @@ static int ll_binary_merge(const struct ll_merge_driver *drv_unused,
const struct ll_merge_options *opts,
int marker_size)
{
+ enum ll_merge_result ret;
mmfile_t *stolen;
assert(opts);
@@ -68,16 +69,19 @@ static int ll_binary_merge(const struct ll_merge_driver *drv_unused,
*/
if (opts->virtual_ancestor) {
stolen = orig;
+ ret = LL_MERGE_OK;
} else {
switch (opts->variant) {
default:
- warning("Cannot merge binary files: %s (%s vs. %s)",
- path, name1, name2);
- /* fallthru */
+ ret = LL_MERGE_BINARY_CONFLICT;
+ stolen = src1;
+ break;
case XDL_MERGE_FAVOR_OURS:
+ ret = LL_MERGE_OK;
stolen = src1;
break;
case XDL_MERGE_FAVOR_THEIRS:
+ ret = LL_MERGE_OK;
stolen = src2;
break;
}
@@ -87,16 +91,10 @@ static int ll_binary_merge(const struct ll_merge_driver *drv_unused,
result->size = stolen->size;
stolen->ptr = NULL;
- /*
- * With -Xtheirs or -Xours, we have cleanly merged;
- * otherwise we got a conflict.
- */
- return opts->variant == XDL_MERGE_FAVOR_OURS ||
- opts->variant == XDL_MERGE_FAVOR_THEIRS ?
- 0 : 1;
+ return ret;
}
-static int ll_xdl_merge(const struct ll_merge_driver *drv_unused,
+static enum ll_merge_result ll_xdl_merge(const struct ll_merge_driver *drv_unused,
mmbuffer_t *result,
const char *path,
mmfile_t *orig, const char *orig_name,
@@ -105,7 +103,9 @@ static int ll_xdl_merge(const struct ll_merge_driver *drv_unused,
const struct ll_merge_options *opts,
int marker_size)
{
+ enum ll_merge_result ret;
xmparam_t xmp;
+ int status;
assert(opts);
if (orig->size > MAX_XDIFF_SIZE ||
@@ -133,10 +133,12 @@ static int ll_xdl_merge(const struct ll_merge_driver *drv_unused,
xmp.ancestor = orig_name;
xmp.file1 = name1;
xmp.file2 = name2;
- return xdl_merge(orig, src1, src2, &xmp, result);
+ status = xdl_merge(orig, src1, src2, &xmp, result);
+ ret = (status > 0) ? LL_MERGE_CONFLICT : status;
+ return ret;
}
-static int ll_union_merge(const struct ll_merge_driver *drv_unused,
+static enum ll_merge_result ll_union_merge(const struct ll_merge_driver *drv_unused,
mmbuffer_t *result,
const char *path,
mmfile_t *orig, const char *orig_name,
@@ -178,7 +180,7 @@ static void create_temp(mmfile_t *src, char *path, size_t len)
/*
* User defined low-level merge driver support.
*/
-static int ll_ext_merge(const struct ll_merge_driver *fn,
+static enum ll_merge_result ll_ext_merge(const struct ll_merge_driver *fn,
mmbuffer_t *result,
const char *path,
mmfile_t *orig, const char *orig_name,
@@ -194,6 +196,7 @@ static int ll_ext_merge(const struct ll_merge_driver *fn,
const char *args[] = { NULL, NULL };
int status, fd, i;
struct stat st;
+ enum ll_merge_result ret;
assert(opts);
sq_quote_buf(&path_sq, path);
@@ -236,7 +239,8 @@ static int ll_ext_merge(const struct ll_merge_driver *fn,
unlink_or_warn(temp[i]);
strbuf_release(&cmd);
strbuf_release(&path_sq);
- return status;
+ ret = (status > 0) ? LL_MERGE_CONFLICT : status;
+ return ret;
}
/*
@@ -362,7 +366,7 @@ static void normalize_file(mmfile_t *mm, const char *path, struct index_state *i
}
}
-int ll_merge(mmbuffer_t *result_buf,
+enum ll_merge_result ll_merge(mmbuffer_t *result_buf,
const char *path,
mmfile_t *ancestor, const char *ancestor_label,
mmfile_t *ours, const char *our_label,
diff --git a/ll-merge.h b/ll-merge.h
index aceb1b24132..e4a20e81a3a 100644
--- a/ll-merge.h
+++ b/ll-merge.h
@@ -82,13 +82,20 @@ struct ll_merge_options {
long xdl_opts;
};
+enum ll_merge_result {
+ LL_MERGE_ERROR = -1,
+ LL_MERGE_OK = 0,
+ LL_MERGE_CONFLICT,
+ LL_MERGE_BINARY_CONFLICT,
+};
+
/**
* Perform a three-way single-file merge in core. This is a thin wrapper
* around `xdl_merge` that takes the path and any merge backend specified in
* `.gitattributes` or `.git/info/attributes` into account.
* Returns 0 for a clean merge.
*/
-int ll_merge(mmbuffer_t *result_buf,
+enum ll_merge_result ll_merge(mmbuffer_t *result_buf,
const char *path,
mmfile_t *ancestor, const char *ancestor_label,
mmfile_t *ours, const char *our_label,
diff --git a/merge-blobs.c b/merge-blobs.c
index ee0a0e90c94..8138090f81c 100644
--- a/merge-blobs.c
+++ b/merge-blobs.c
@@ -36,7 +36,7 @@ static void *three_way_filemerge(struct index_state *istate,
mmfile_t *their,
unsigned long *size)
{
- int merge_status;
+ enum ll_merge_result merge_status;
mmbuffer_t res;
/*
@@ -50,6 +50,9 @@ static void *three_way_filemerge(struct index_state *istate,
istate, NULL);
if (merge_status < 0)
return NULL;
+ if (merge_status == LL_MERGE_BINARY_CONFLICT)
+ warning("Cannot merge binary files: %s (%s vs. %s)",
+ path, ".our", ".their");
*size = res.size;
return res.ptr;
diff --git a/merge-ort.c b/merge-ort.c
index 0342f104836..c24da2ba3cb 100644
--- a/merge-ort.c
+++ b/merge-ort.c
@@ -1743,7 +1743,7 @@ static int merge_3way(struct merge_options *opt,
mmfile_t orig, src1, src2;
struct ll_merge_options ll_opts = {0};
char *base, *name1, *name2;
- int merge_status;
+ enum ll_merge_result merge_status;
if (!opt->priv->attr_index.initialized)
initialize_attr_index(opt);
@@ -1787,6 +1787,9 @@ static int merge_3way(struct merge_options *opt,
merge_status = ll_merge(result_buf, path, &orig, base,
&src1, name1, &src2, name2,
&opt->priv->attr_index, &ll_opts);
+ if (merge_status == LL_MERGE_BINARY_CONFLICT)
+ warning("Cannot merge binary files: %s (%s vs. %s)",
+ path, name1, name2);
free(base);
free(name1);
diff --git a/merge-recursive.c b/merge-recursive.c
index d9457797dbb..bc73c52dd84 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -1044,7 +1044,7 @@ static int merge_3way(struct merge_options *opt,
mmfile_t orig, src1, src2;
struct ll_merge_options ll_opts = {0};
char *base, *name1, *name2;
- int merge_status;
+ enum ll_merge_result merge_status;
ll_opts.renormalize = opt->renormalize;
ll_opts.extra_marker_size = extra_marker_size;
@@ -1090,6 +1090,9 @@ static int merge_3way(struct merge_options *opt,
merge_status = ll_merge(result_buf, a->path, &orig, base,
&src1, name1, &src2, name2,
opt->repo->index, &ll_opts);
+ if (merge_status == LL_MERGE_BINARY_CONFLICT)
+ warning("Cannot merge binary files: %s (%s vs. %s)",
+ a->path, name1, name2);
free(base);
free(name1);
diff --git a/notes-merge.c b/notes-merge.c
index b4a3a903e86..01d596920ea 100644
--- a/notes-merge.c
+++ b/notes-merge.c
@@ -344,7 +344,7 @@ static int ll_merge_in_worktree(struct notes_merge_options *o,
{
mmbuffer_t result_buf;
mmfile_t base, local, remote;
- int status;
+ enum ll_merge_result status;
read_mmblob(&base, &p->base);
read_mmblob(&local, &p->local);
@@ -358,6 +358,9 @@ static int ll_merge_in_worktree(struct notes_merge_options *o,
free(local.ptr);
free(remote.ptr);
+ if (status == LL_MERGE_BINARY_CONFLICT)
+ warning("Cannot merge binary files: %s (%s vs. %s)",
+ oid_to_hex(&p->obj), o->local_ref, o->remote_ref);
if ((status < 0) || !result_buf.ptr)
die("Failed to execute internal merge");
diff --git a/rerere.c b/rerere.c
index d83d58df4fb..d26627c5932 100644
--- a/rerere.c
+++ b/rerere.c
@@ -609,19 +609,20 @@ static int try_merge(struct index_state *istate,
const struct rerere_id *id, const char *path,
mmfile_t *cur, mmbuffer_t *result)
{
- int ret;
+ enum ll_merge_result ret;
mmfile_t base = {NULL, 0}, other = {NULL, 0};
if (read_mmfile(&base, rerere_path(id, "preimage")) ||
- read_mmfile(&other, rerere_path(id, "postimage")))
- ret = 1;
- else
+ read_mmfile(&other, rerere_path(id, "postimage"))) {
+ ret = LL_MERGE_CONFLICT;
+ } else {
/*
* A three-way merge. Note that this honors user-customizable
* low-level merge driver settings.
*/
ret = ll_merge(result, path, &base, NULL, cur, "", &other, "",
istate, NULL);
+ }
free(base.ptr);
free(other.ptr);
--
gitgitgadget
