tree-diff: rework diff_tree interface to be sha1 based

diff --git a/entry.c b/entry.c
index 63c52edf600b5fd966e24cc5758bdab7dbeaf41b..7b7aa8167adade20f38cfb2709e02b3ed31f11a4 100644 (file)
--- a/entry.c
+++ b/entry.c
@@ -79,7 +79,7 @@ static int create_file(const char *path, unsigned int mode)
        return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
 }
 
-static void *read_blob_entry(struct cache_entry *ce, unsigned long *size)
+static void *read_blob_entry(const struct cache_entry *ce, unsigned long *size)
 {
        enum object_type type;
        void *new = read_sha1_file(ce->sha1, &type, size);
@@ -92,7 +92,7 @@ static void *read_blob_entry(struct cache_entry *ce, unsigned long *size)
        return NULL;
 }
 
-static int open_output_fd(char *path, struct cache_entry *ce, int to_tempfile)
+static int open_output_fd(char *path, const struct cache_entry *ce, int to_tempfile)
 {
        int symlink = (ce->ce_mode & S_IFMT) != S_IFREG;
        if (to_tempfile) {
@@ -115,26 +115,29 @@ static int fstat_output(int fd, const struct checkout *state, struct stat *st)
        return 0;
 }
 
-static int streaming_write_entry(struct cache_entry *ce, char *path,
+static int streaming_write_entry(const struct cache_entry *ce, char *path,
                                 struct stream_filter *filter,
                                 const struct checkout *state, int to_tempfile,
                                 int *fstat_done, struct stat *statbuf)
 {
-       int result = -1;
+       int result = 0;
        int fd;
 
        fd = open_output_fd(path, ce, to_tempfile);
-       if (0 <= fd) {
-               result = stream_blob_to_fd(fd, ce->sha1, filter, 1);
-               *fstat_done = fstat_output(fd, state, statbuf);
-               result = close(fd);
-       }
-       if (result && 0 <= fd)
+       if (fd < 0)
+               return -1;
+
+       result |= stream_blob_to_fd(fd, ce->sha1, filter, 1);
+       *fstat_done = fstat_output(fd, state, statbuf);
+       result |= close(fd);
+
+       if (result)
                unlink(path);
        return result;
 }
 
-static int write_entry(struct cache_entry *ce, char *path, const struct checkout *state, int to_tempfile)
+static int write_entry(struct cache_entry *ce,
+                      char *path, const struct checkout *state, int to_tempfile)
 {
        unsigned int ce_mode_s_ifmt = ce->ce_mode & S_IFMT;
        int fd, ret, fstat_done = 0;
@@ -197,9 +200,9 @@ static int write_entry(struct cache_entry *ce, char *path, const struct checkout
                break;
        case S_IFGITLINK:
                if (to_tempfile)
-                       return error("cannot create temporary subproject %s", path);
+                       return error("cannot create temporary submodule %s", path);
                if (mkdir(path, 0777) < 0)
-                       return error("cannot create subproject directory %s", path);
+                       return error("cannot create submodule directory %s", path);
                break;
        default:
                return error("unknown file mode for %s in index", path);
@@ -231,18 +234,30 @@ static int check_path(const char *path, int len, struct stat *st, int skiplen)
        return lstat(path, st);
 }
 
-int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath)
+/*
+ * Write the contents from ce out to the working tree.
+ *
+ * When topath[] is not NULL, instead of writing to the working tree
+ * file named by ce, a temporary file is created by this function and
+ * its name is returned in topath[], which must be able to hold at
+ * least TEMPORARY_FILENAME_LENGTH bytes long.
+ */
+int checkout_entry(struct cache_entry *ce,
+                  const struct checkout *state, char *topath)
 {
-       static char path[PATH_MAX + 1];
+       static struct strbuf path_buf = STRBUF_INIT;
+       char *path;
        struct stat st;
-       int len = state->base_dir_len;
+       int len;
 
        if (topath)
                return write_entry(ce, topath, state, 1);
 
-       memcpy(path, state->base_dir, len);
-       strcpy(path + len, ce->name);
-       len += ce_namelen(ce);
+       strbuf_reset(&path_buf);
+       strbuf_add(&path_buf, state->base_dir, state->base_dir_len);
+       strbuf_add(&path_buf, ce->name, ce_namelen(ce));
+       path = path_buf.buf;
+       len = path_buf.len;
 
        if (!check_path(path, len, &st, state->base_dir_len)) {
                unsigned changed = ce_match_stat(ce, &st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE);