mergetools/diffmerge: support DiffMerge as a git mergetool

diff --git a/read-cache.c b/read-cache.c
index 44145c223435f4617e9b3f2730fb79599db66bbf..6bbe1b1fb3435247e1114cbf496cd9d7640f3def 100644 (file)
--- a/read-cache.c
+++ b/read-cache.c
@@ -1114,7 +1114,8 @@ static void show_file(const char * fmt, const char * name, int in_porcelain,
        printf(fmt, name);
 }
 
-int refresh_index(struct index_state *istate, unsigned int flags, const char **pathspec,
+int refresh_index(struct index_state *istate, unsigned int flags,
+                 const struct pathspec *pathspec,
                  char *seen, const char *header_msg)
 {
        int i;
@@ -1149,7 +1150,7 @@ int refresh_index(struct index_state *istate, unsigned int flags, const char **p
                        continue;
 
                if (pathspec &&
-                   !match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, seen))
+                   !match_pathspec_depth(pathspec, ce->name, ce_namelen(ce), 0, seen))
                        filtered = 1;
 
                if (ce_stage(ce)) {
@@ -1817,8 +1818,17 @@ int write_index(struct index_state *istate, int newfd)
                        continue;
                if (!ce_uptodate(ce) && is_racy_timestamp(istate, ce))
                        ce_smudge_racily_clean_entry(ce);
-               if (is_null_sha1(ce->sha1))
-                       return error("cache entry has null sha1: %s", ce->name);
+               if (is_null_sha1(ce->sha1)) {
+                       static const char msg[] = "cache entry has null sha1: %s";
+                       static int allow = -1;
+
+                       if (allow < 0)
+                               allow = git_env_bool("GIT_ALLOW_NULL_SHA1", 0);
+                       if (allow)
+                               warning(msg, ce->name);
+                       else
+                               return error(msg, ce->name);
+               }
                if (ce_write_entry(&c, newfd, ce, previous_name) < 0)
                        return -1;
        }