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-rw-r--r--Documentation/git-log.txt2
-rwxr-xr-xt/t4205-log-follow-harder-copies.sh56
-rw-r--r--tree-diff.c2
3 files changed, 58 insertions, 2 deletions
diff --git a/Documentation/git-log.txt b/Documentation/git-log.txt
index fb184ba186..0727818bb1 100644
--- a/Documentation/git-log.txt
+++ b/Documentation/git-log.txt
@@ -56,7 +56,7 @@ include::diff-options.txt[]
commits, and doesn't limit diff for those commits.
--follow::
- Continue listing the history of a file beyond renames.
+ Continue listing the history of a file beyond renames/copies.
--log-size::
Before the log message print out its size in bytes. Intended
diff --git a/t/t4205-log-follow-harder-copies.sh b/t/t4205-log-follow-harder-copies.sh
new file mode 100755
index 0000000000..ad29e65fcb
--- /dev/null
+++ b/t/t4205-log-follow-harder-copies.sh
@@ -0,0 +1,56 @@
+#!/bin/sh
+#
+# Copyright (c) 2010 Bo Yang
+#
+
+test_description='Test --follow should always find copies hard in git log.
+
+'
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/diff-lib.sh
+
+echo >path0 'Line 1
+Line 2
+Line 3
+'
+
+test_expect_success \
+ 'add a file path0 and commit.' \
+ 'git add path0 &&
+ git commit -m "Add path0"'
+
+echo >path0 'New line 1
+New line 2
+New line 3
+'
+test_expect_success \
+ 'Change path0.' \
+ 'git add path0 &&
+ git commit -m "Change path0"'
+
+cat <path0 >path1
+test_expect_success \
+ 'copy path0 to path1.' \
+ 'git add path1 &&
+ git commit -m "Copy path1 from path0"'
+
+test_expect_success \
+ 'find the copy path0 -> path1 harder' \
+ 'git log --follow --name-status --pretty="format:%s" path1 > current'
+
+cat >expected <<\EOF
+Copy path1 from path0
+C100 path0 path1
+
+Change path0
+M path0
+
+Add path0
+A path0
+EOF
+
+test_expect_success \
+ 'validate the output.' \
+ 'compare_diff_patch current expected'
+
+test_done
diff --git a/tree-diff.c b/tree-diff.c
index fe9f52c479..1fb3e94614 100644
--- a/tree-diff.c
+++ b/tree-diff.c
@@ -346,7 +346,7 @@ static void try_to_follow_renames(struct tree_desc *t1, struct tree_desc *t2, co
diff_setup(&diff_opts);
DIFF_OPT_SET(&diff_opts, RECURSIVE);
- diff_opts.detect_rename = DIFF_DETECT_RENAME;
+ DIFF_OPT_SET(&diff_opts, FIND_COPIES_HARDER);
diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
diff_opts.single_follow = opt->paths[0];
diff_opts.break_opt = opt->break_opt;