read-tree --debug-unpack

A debugging patch.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-read-tree.c b/builtin-read-tree.c
index 2a3a32cbfe83a0e0366d04a99bb49606f647f594..0c1f40d10d1846bb187f691ad16d6ed24cc7aa8d 100644 (file)
--- a/builtin-read-tree.c
+++ b/builtin-read-tree.c
@@ -64,6 +64,34 @@ static int exclude_per_directory_cb(const struct option *opt, const char *arg,
        return 0;
 }
 
+static void debug_stage(const char *label, struct cache_entry *ce,
+                       struct unpack_trees_options *o)
+{
+       printf("%s ", label);
+       if (!ce)
+               printf("(missing)\n");
+       else if (ce == o->df_conflict_entry)
+               printf("(conflict)\n");
+       else
+               printf("%06o #%d %s %.8s\n",
+                      ce->ce_mode, ce_stage(ce), ce->name,
+                      sha1_to_hex(ce->sha1));
+}
+
+static int debug_merge(struct cache_entry **stages, struct unpack_trees_options *o)
+{
+       int i;
+
+       printf("* %d-way merge\n", o->merge_size);
+       debug_stage("index", stages[0], o);
+       for (i = 1; i <= o->merge_size; i++) {
+               char buf[24];
+               sprintf(buf, "ent#%d", i);
+               debug_stage(buf, stages[i], o);
+       }
+       return 0;
+}
+
 static struct lock_file lock_file;
 
 int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
@@ -98,6 +126,8 @@ int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
                  PARSE_OPT_NONEG, exclude_per_directory_cb },
                OPT_SET_INT('i', NULL, &opts.index_only,
                            "don't check the working tree after merging", 1),
+               OPT_SET_INT(0, "debug-unpack", &opts.debug_unpack,
+                           "debug unpack-trees", 1),
                OPT_END()
        };
 
@@ -165,6 +195,9 @@ int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
                        opts.head_idx = 1;
        }
 
+       if (opts.debug_unpack)
+               opts.fn = debug_merge;
+
        cache_tree_free(&active_cache_tree);
        for (i = 0; i < nr_trees; i++) {
                struct tree *tree = trees[i];
@@ -174,6 +207,9 @@ int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
        if (unpack_trees(nr_trees, t, &opts))
                return 128;
 
+       if (opts.debug_unpack)
+               return 0; /* do not write the index out */
+
        /*
         * When reading only one tree (either the most basic form,
         * "-m ent" or "--reset ent" form), we can obtain a fully

diff --git a/unpack-trees.c b/unpack-trees.c
index 74cabc36ff09255819558c38b25a38a4e6871418..10e8871a747b0a9519b2397f150517ec671e7ee6 100644 (file)
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -501,6 +501,38 @@ static struct cache_entry *find_cache_entry(struct traverse_info *info,
                return NULL;
 }
 
+static void debug_path(struct traverse_info *info)
+{
+       if (info->prev) {
+               debug_path(info->prev);
+               if (*info->prev->name.path)
+                       putchar('/');
+       }
+       printf("%s", info->name.path);
+}
+
+static void debug_name_entry(int i, struct name_entry *n)
+{
+       printf("ent#%d %06o %s\n", i,
+              n->path ? n->mode : 0,
+              n->path ? n->path : "(missing)");
+}
+
+static void debug_unpack_callback(int n,
+                                 unsigned long mask,
+                                 unsigned long dirmask,
+                                 struct name_entry *names,
+                                 struct traverse_info *info)
+{
+       int i;
+       printf("* unpack mask %lu, dirmask %lu, cnt %d ",
+              mask, dirmask, n);
+       debug_path(info);
+       putchar('\n');
+       for (i = 0; i < n; i++)
+               debug_name_entry(i, names + i);
+}
+
 static int unpack_callback(int n, unsigned long mask, unsigned long dirmask, struct name_entry *names, struct traverse_info *info)
 {
        struct cache_entry *src[MAX_UNPACK_TREES + 1] = { NULL, };
@@ -511,6 +543,9 @@ static int unpack_callback(int n, unsigned long mask, unsigned long dirmask, str
        while (!p->mode)
                p++;
 
+       if (o->debug_unpack)
+               debug_unpack_callback(n, mask, dirmask, names, info);
+
        /* Are we supposed to look at the index too? */
        if (o->merge) {
                while (1) {

diff --git a/unpack-trees.h b/unpack-trees.h
index 9a0733ea8545efd33e1d608255612080afc670e7..701dca59a8e828cae78c394783ff8d6f8404a5f1 100644 (file)
--- a/unpack-trees.h
+++ b/unpack-trees.h
@@ -28,6 +28,7 @@ struct unpack_trees_options {
                     skip_unmerged,
                     initial_checkout,
                     diff_index_cached,
+                    debug_unpack,
                     gently;
        const char *prefix;
        int cache_bottom;