difftool: add various git-difftool tests

[git.git] / diff.c

diff --git a/diff.c b/diff.c
index 75d9fab8f87033ba86f687fbc92c5d4ee4c68d7b..e0fa78c84d99387227048008a3276d410c5a71c8 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -1757,7 +1757,8 @@ static int reuse_worktree_file(const char *name, const unsigned char *sha1, int
        struct stat st;
        int pos, len;
 
-       /* We do not read the cache ourselves here, because the
+       /*
+        * We do not read the cache ourselves here, because the
         * benchmark with my previous version that always reads cache
         * shows that it makes things worse for diff-tree comparing
         * two linux-2.6 kernel trees in an already checked out work
@@ -1797,6 +1798,13 @@ static int reuse_worktree_file(const char *name, const unsigned char *sha1, int
        if (hashcmp(sha1, ce->sha1) || !S_ISREG(ce->ce_mode))
                return 0;
 
+       /*
+        * If ce is marked as "assume unchanged", there is no
+        * guarantee that work tree matches what we are looking for.
+        */
+       if (ce->ce_flags & CE_VALID)
+               return 0;
+
        /*
         * If ce matches the file in the work tree, we can reuse it.
         */
@@ -1946,17 +1954,23 @@ void diff_free_filespec_data(struct diff_filespec *s)
        s->cnt_data = NULL;
 }
 
-static void prep_temp_blob(struct diff_tempfile *temp,
+static void prep_temp_blob(const char *path, struct diff_tempfile *temp,
                           void *blob,
                           unsigned long size,
                           const unsigned char *sha1,
                           int mode)
 {
        int fd;
+       struct strbuf buf = STRBUF_INIT;
 
        fd = git_mkstemp(temp->tmp_path, PATH_MAX, ".diff_XXXXXX");
        if (fd < 0)
                die("unable to create temp-file: %s", strerror(errno));
+       if (convert_to_working_tree(path,
+                       (const char *)blob, (size_t)size, &buf)) {
+               blob = buf.buf;
+               size = buf.len;
+       }
        if (write_in_full(fd, blob, size) != size)
                die("unable to write temp-file");
        close(fd);
@@ -1964,6 +1978,7 @@ static void prep_temp_blob(struct diff_tempfile *temp,
        strcpy(temp->hex, sha1_to_hex(sha1));
        temp->hex[40] = 0;
        sprintf(temp->mode, "%06o", mode);
+       strbuf_release(&buf);
 }
 
 static struct diff_tempfile *prepare_temp_file(const char *name,
@@ -2004,7 +2019,7 @@ static struct diff_tempfile *prepare_temp_file(const char *name,
                                die("readlink(%s)", name);
                        if (ret == sizeof(buf))
                                die("symlink too long: %s", name);
-                       prep_temp_blob(temp, buf, ret,
+                       prep_temp_blob(name, temp, buf, ret,
                                       (one->sha1_valid ?
                                        one->sha1 : null_sha1),
                                       (one->sha1_valid ?
@@ -2030,7 +2045,7 @@ static struct diff_tempfile *prepare_temp_file(const char *name,
        else {
                if (diff_populate_filespec(one, 0))
                        die("cannot read data blob for %s", one->path);
-               prep_temp_blob(temp, one->data, one->size,
+               prep_temp_blob(name, temp, one->data, one->size,
                               one->sha1, one->mode);
        }
        return temp;