Merge fixes up to GIT 1.0.5

10 files changed, 136 insertions, 22 deletions

diff --git a/commit.c b/commit.c
index e867b86e6..edd4dedcd 100644
--- a/commit.c
+++ b/commit.c
@@ -560,6 +560,9 @@ void sort_in_topological_order(struct commit_list ** list)
 		next = next->next;
 		count++;
 	}
+	
+	if (!count)
+		return;
 	/* allocate an array to help sort the list */
 	nodes = xcalloc(count, sizeof(*nodes));
 	/* link the list to the array */
diff --git a/diff.c b/diff.c
index c8159183d..66057e5d6 100644
--- a/diff.c
+++ b/diff.c
@@ -504,9 +504,9 @@ static void prepare_temp_file(const char *name,
 		}
 		if (S_ISLNK(st.st_mode)) {
 			int ret;
-			char *buf, buf_[1024];
-			buf = ((sizeof(buf_) < st.st_size) ?
-			       xmalloc(st.st_size) : buf_);
+			char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
+			if (sizeof(buf) <= st.st_size)
+				die("symlink too long: %s", name);
 			ret = readlink(name, buf, st.st_size);
 			if (ret < 0)
 				die("readlink(%s)", name);
@@ -650,7 +650,7 @@ static void diff_fill_sha1_info(struct diff_filespec *one)
 	if (DIFF_FILE_VALID(one)) {
 		if (!one->sha1_valid) {
 			struct stat st;
-			if (stat(one->path, &st) < 0)
+			if (lstat(one->path, &st) < 0)
 				die("stat %s", one->path);
 			if (index_path(one->sha1, one->path, &st, 0))
 				die("cannot hash %s\n", one->path);
diff --git a/diffcore-order.c b/diffcore-order.c
index b38122361..0bc2b22f8 100644
--- a/diffcore-order.c
+++ b/diffcore-order.c
@@ -105,9 +105,13 @@ static int compare_pair_order(const void *a_, const void *b_)
 void diffcore_order(const char *orderfile)
 {
 	struct diff_queue_struct *q = &diff_queued_diff;
-	struct pair_order *o = xmalloc(sizeof(*o) * q->nr);
+	struct pair_order *o;
 	int i;
 
+	if (!q->nr)
+		return;
+
+	o = xmalloc(sizeof(*o) * q->nr);
 	prepare_order(orderfile);
 	for (i = 0; i < q->nr; i++) {
 		o[i].pair = q->queue[i];
diff --git a/diffcore-pathspec.c b/diffcore-pathspec.c
index 68fe00913..139fe882f 100644
--- a/diffcore-pathspec.c
+++ b/diffcore-pathspec.c
@@ -48,6 +48,9 @@ void diffcore_pathspec(const char **pathspec)
 	for (i = 0; pathspec[i]; i++)
 		;
 	speccnt = i;
+	if (!speccnt)
+		return;
+
 	spec = xmalloc(sizeof(*spec) * speccnt);
 	for (i = 0; pathspec[i]; i++) {
 		spec[i].spec = pathspec[i];
diff --git a/diffcore-rename.c b/diffcore-rename.c
index dba965c0b..39d9126cb 100644
--- a/diffcore-rename.c
+++ b/diffcore-rename.c
@@ -282,7 +282,7 @@ void diffcore_rename(struct diff_options *options)
 		else if (detect_rename == DIFF_DETECT_COPY)
 			register_rename_src(p->one, 1);
 	}
-	if (rename_dst_nr == 0 ||
+	if (rename_dst_nr == 0 || rename_src_nr == 0 ||
 	    (0 < rename_limit && rename_limit < rename_dst_nr))
 		goto cleanup; /* nothing to do */
 
diff --git a/index-pack.c b/index-pack.c
index d4ce3af58..541d7bc1c 100644
--- a/index-pack.c
+++ b/index-pack.c
@@ -352,18 +352,24 @@ static int sha1_compare(const void *_a, const void *_b)
 static void write_index_file(const char *index_name, unsigned char *sha1)
 {
 	struct sha1file *f;
-	struct object_entry **sorted_by_sha =
-		xcalloc(nr_objects, sizeof(struct object_entry *));
-	struct object_entry **list = sorted_by_sha;
-	struct object_entry **last = sorted_by_sha + nr_objects;
+	struct object_entry **sorted_by_sha, **list, **last;
 	unsigned int array[256];
 	int i;
 	SHA_CTX ctx;
 
-	for (i = 0; i < nr_objects; ++i)
-		sorted_by_sha[i] = &objects[i];
-	qsort(sorted_by_sha, nr_objects, sizeof(sorted_by_sha[0]),
-	      sha1_compare);
+	if (nr_objects) {
+		sorted_by_sha =
+			xcalloc(nr_objects, sizeof(struct object_entry *));
+		list = sorted_by_sha;
+		last = sorted_by_sha + nr_objects;
+		for (i = 0; i < nr_objects; ++i)
+			sorted_by_sha[i] = &objects[i];
+		qsort(sorted_by_sha, nr_objects, sizeof(sorted_by_sha[0]),
+		      sha1_compare);
+
+	}
+	else
+		sorted_by_sha = list = last = NULL;
 
 	unlink(index_name);
 	f = sha1create("%s", index_name);
diff --git a/read-tree.c b/read-tree.c
index e3b9c0d9f..a46c6fe2f 100644
--- a/read-tree.c
+++ b/read-tree.c
@@ -294,17 +294,20 @@ static int unpack_trees(merge_fn_t fn)
 {
 	int indpos = 0;
 	unsigned len = object_list_length(trees);
-	struct tree_entry_list **posns = 
-		xmalloc(len * sizeof(struct tree_entry_list *));
+	struct tree_entry_list **posns;
 	int i;
 	struct object_list *posn = trees;
 	merge_size = len;
-	for (i = 0; i < len; i++) {
-		posns[i] = ((struct tree *) posn->item)->entries;
-		posn = posn->next;
+
+	if (len) {
+		posns = xmalloc(len * sizeof(struct tree_entry_list *));
+		for (i = 0; i < len; i++) {
+			posns[i] = ((struct tree *) posn->item)->entries;
+			posn = posn->next;
+		}
+		if (unpack_trees_rec(posns, len, "", fn, &indpos))
+			return -1;
 	}
-	if (unpack_trees_rec(posns, len, "", fn, &indpos))
-		return -1;
 
 	if (trivial_merges_only && nontrivial_merge)
 		die("Merge requires file-level merging");
diff --git a/t/t4011-diff-symlink.sh b/t/t4011-diff-symlink.sh
new file mode 100755
index 000000000..e3ebf382e
--- /dev/null
+++ b/t/t4011-diff-symlink.sh
@@ -0,0 +1,85 @@
+#!/bin/sh
+#
+# Copyright (c) 2005 Johannes Schindelin
+#
+
+test_description='Test diff of symlinks.
+
+'
+. ./test-lib.sh
+. ../diff-lib.sh
+
+cat > expected << EOF
+diff --git a/frotz b/frotz
+new file mode 120000
+index 0000000..7c465af
+--- /dev/null
++++ b/frotz
+@@ -0,0 +1 @@
++xyzzy
+\ No newline at end of file
+EOF
+
+test_expect_success \
+    'diff new symlink' \
+    'ln -s xyzzy frotz &&
+    git-update-index &&
+    tree=$(git-write-tree) &&
+    git-update-index --add frotz &&
+    GIT_DIFF_OPTS=--unified=0 git-diff-index -M -p $tree > current &&
+    compare_diff_patch current expected'
+
+test_expect_success \
+    'diff unchanged symlink' \
+    'tree=$(git-write-tree) &&
+    git-update-index frotz &&
+    test -z "$(git-diff-index --name-only $tree)"'
+
+cat > expected << EOF
+diff --git a/frotz b/frotz
+deleted file mode 120000
+index 7c465af..0000000
+--- a/frotz
++++ /dev/null
+@@ -1 +0,0 @@
+-xyzzy
+\ No newline at end of file
+EOF
+
+test_expect_success \
+    'diff removed symlink' \
+    'rm frotz &&
+    git-diff-index -M -p $tree > current &&
+    compare_diff_patch current expected'
+
+cat > expected << EOF
+diff --git a/frotz b/frotz
+EOF
+
+test_expect_success \
+    'diff identical, but newly created symlink' \
+    'sleep 1 &&
+    ln -s xyzzy frotz &&
+    git-diff-index -M -p $tree > current &&
+    compare_diff_patch current expected'
+
+cat > expected << EOF
+diff --git a/frotz b/frotz
+index 7c465af..df1db54 120000
+--- a/frotz
++++ b/frotz
+@@ -1 +1 @@
+-xyzzy
+\ No newline at end of file
++yxyyz
+\ No newline at end of file
+EOF
+
+test_expect_success \
+    'diff different symlink' \
+    'rm frotz &&
+    ln -s yxyyz frotz &&
+    git-diff-index -M -p $tree > current &&
+    compare_diff_patch current expected'
+
+test_done
diff --git a/t/t5300-pack-object.sh b/t/t5300-pack-object.sh
index 7dfb1ab77..1510ea9fc 100755
--- a/t/t5300-pack-object.sh
+++ b/t/t5300-pack-object.sh
@@ -142,6 +142,7 @@ test_expect_success \
      else :;
      fi &&
 
+     : PACK_SIGNATURE &&
      cp test-1-${packname_1}.pack test-3.pack &&
      dd if=/dev/zero of=test-3.pack count=1 bs=1 conv=notrunc seek=2 &&
      if git-verify-pack test-3.idx
@@ -149,6 +150,7 @@ test_expect_success \
      else :;
      fi &&
 
+     : PACK_VERSION &&
      cp test-1-${packname_1}.pack test-3.pack &&
      dd if=/dev/zero of=test-3.pack count=1 bs=1 conv=notrunc seek=7 &&
      if git-verify-pack test-3.idx
@@ -156,6 +158,7 @@ test_expect_success \
      else :;
      fi &&
 
+     : TYPE/SIZE byte of the first packed object data &&
      cp test-1-${packname_1}.pack test-3.pack &&
      dd if=/dev/zero of=test-3.pack count=1 bs=1 conv=notrunc seek=12 &&
      if git-verify-pack test-3.idx
@@ -163,8 +166,11 @@ test_expect_success \
      else :;
      fi &&
 
+     : sum of the index file itself &&
+     l=`wc -c <test-3.idx` &&
+     l=`expr "$l" - 20` &&
      cp test-1-${packname_1}.pack test-3.pack &&
-     dd if=/dev/zero of=test-3.idx count=1 bs=1 conv=notrunc seek=1200 &&
+     dd if=/dev/zero of=test-3.idx count=20 bs=1 conv=notrunc seek=$l &&
      if git-verify-pack test-3.pack
      then false
      else :;
diff --git a/tree-diff.c b/tree-diff.c
index 0ef06a9e3..382092bce 100644
--- a/tree-diff.c
+++ b/tree-diff.c
@@ -263,6 +263,10 @@ void diff_tree_setup_paths(const char **p)
 
 		paths = p;
 		nr_paths = count_paths(paths);
+		if (nr_paths == 0) {
+			pathlens = NULL;
+			return;
+		}
 		pathlens = xmalloc(nr_paths * sizeof(int));
 		for (i=0; i<nr_paths; i++)
 			pathlens[i] = strlen(paths[i]);