branch: fix segfault when resolving an invalid HEAD

diff --git a/diff.c b/diff.c
index 8f7a7d110857f2dcfcdb577da08df8deaf720cf7..b28933f870d7dd11596fd3715280e1488ac2430f 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -1364,6 +1364,32 @@ static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
        return e;
 }
 
+static int populate_from_stdin(struct diff_filespec *s)
+{
+#define INCREMENT 1024
+       char *buf;
+       unsigned long size;
+       int got;
+
+       size = 0;
+       buf = NULL;
+       while (1) {
+               buf = xrealloc(buf, size + INCREMENT);
+               got = xread(0, buf + size, INCREMENT);
+               if (!got)
+                       break; /* EOF */
+               if (got < 0)
+                       return error("error while reading from stdin %s",
+                                    strerror(errno));
+               size += got;
+       }
+       s->should_munmap = 0;
+       s->data = buf;
+       s->size = size;
+       s->should_free = 1;
+       return 0;
+}
+
 /*
  * While doing rename detection and pickaxe operation, we may need to
  * grab the data for the blob (or file) for our own in-core comparison.
@@ -1389,6 +1415,9 @@ int diff_populate_filespec(struct diff_filespec *s, int size_only)
                char *buf;
                unsigned long size;
 
+               if (!strcmp(s->path, "-"))
+                       return populate_from_stdin(s);
+
                if (lstat(s->path, &st) < 0) {
                        if (errno == ENOENT) {
                        err_empty:
@@ -1439,14 +1468,15 @@ int diff_populate_filespec(struct diff_filespec *s, int size_only)
                enum object_type type;
                struct sha1_size_cache *e;
 
+               if (size_only && use_size_cache &&
+                   (e = locate_size_cache(s->sha1, 1, 0)) != NULL) {
+                       s->size = e->size;
+                       return 0;
+               }
+
                if (size_only) {
-                       e = locate_size_cache(s->sha1, 1, 0);
-                       if (e) {
-                               s->size = e->size;
-                               return 0;
-                       }
                        type = sha1_object_info(s->sha1, &s->size);
-                       if (type < 0)
+                       if (use_size_cache && 0 < type)
                                locate_size_cache(s->sha1, 0, s->size);
                }
                else {
@@ -1690,6 +1720,10 @@ static void diff_fill_sha1_info(struct diff_filespec *one)
        if (DIFF_FILE_VALID(one)) {
                if (!one->sha1_valid) {
                        struct stat st;
+                       if (!strcmp(one->path, "-")) {
+                               hashcpy(one->sha1, null_sha1);
+                               return;
+                       }
                        if (lstat(one->path, &st) < 0)
                                die("stat %s", one->path);
                        if (index_path(one->sha1, one->path, &st, 0))
@@ -1925,6 +1959,23 @@ int diff_setup_done(struct diff_options *options)
        if (options->abbrev <= 0 || 40 < options->abbrev)
                options->abbrev = 40; /* full */
 
+       /*
+        * It does not make sense to show the first hit we happened
+        * to have found.  It does not make sense not to return with
+        * exit code in such a case either.
+        */
+       if (options->quiet) {
+               options->output_format = DIFF_FORMAT_NO_OUTPUT;
+               options->exit_with_status = 1;
+       }
+
+       /*
+        * If we postprocess in diffcore, we cannot simply return
+        * upon the first hit.  We need to run diff as usual.
+        */
+       if (options->pickaxe || options->filter)
+               options->quiet = 0;
+
        return 0;
 }
 
@@ -2101,6 +2152,10 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
                options->color_diff = options->color_diff_words = 1;
        else if (!strcmp(arg, "--no-renames"))
                options->detect_rename = 0;
+       else if (!strcmp(arg, "--exit-code"))
+               options->exit_with_status = 1;
+       else if (!strcmp(arg, "--quiet"))
+               options->quiet = 1;
        else
                return 0;
        return 1;
@@ -2865,6 +2920,8 @@ static void diffcore_apply_filter(const char *filter)
 
 void diffcore_std(struct diff_options *options)
 {
+       if (options->quiet)
+               return;
        if (options->break_opt != -1)
                diffcore_break(options->break_opt);
        if (options->detect_rename)
@@ -2877,18 +2934,11 @@ void diffcore_std(struct diff_options *options)
                diffcore_order(options->orderfile);
        diff_resolve_rename_copy();
        diffcore_apply_filter(options->filter);
-}
-
 
-void diffcore_std_no_resolve(struct diff_options *options)
-{
-       if (options->pickaxe)
-               diffcore_pickaxe(options->pickaxe, options->pickaxe_opts);
-       if (options->orderfile)
-               diffcore_order(options->orderfile);
-       diffcore_apply_filter(options->filter);
+       options->has_changes = !!diff_queued_diff.nr;
 }
 
+
 void diff_addremove(struct diff_options *options,
                    int addremove, unsigned mode,
                    const unsigned char *sha1,
@@ -2924,6 +2974,7 @@ void diff_addremove(struct diff_options *options,
                fill_filespec(two, sha1, mode);
 
        diff_queue(&diff_queued_diff, one, two);
+       options->has_changes = 1;
 }
 
 void diff_change(struct diff_options *options,
@@ -2949,6 +3000,7 @@ void diff_change(struct diff_options *options,
        fill_filespec(two, new_sha1, new_mode);
 
        diff_queue(&diff_queued_diff, one, two);
+       options->has_changes = 1;
 }
 
 void diff_unmerge(struct diff_options *options,