[PATCH v14 27/41] builtin/apply: make create_one_file() return -1 on error

[Christian Couder]

To libify `git apply` functionality we have to signal errors to the
caller instead of exit()ing.

To do that in a compatible manner with the rest of the error handling
in "builtin/apply.c", create_one_file() should return -1 instead of
calling exit().

Signed-off-by: Christian Couder <chrisc...@tuxfamily.org>
---
 builtin/apply.c | 36 +++++++++++++++++++++---------------
 1 file changed, 21 insertions(+), 15 deletions(-)

diff --git a/builtin/apply.c b/builtin/apply.c
index 3145e03..5cd7fd8 100644
--- a/builtin/apply.c
+++ b/builtin/apply.c
@@ -4198,32 +4198,36 @@ static int try_create_file(const char *path, unsigned 
int mode, const char *buf,
  * We optimistically assume that the directories exist,
  * which is true 99% of the time anyway. If they don't,
  * we create them and try again.
+ *
+ * Returns:
+ *   -1 on error
+ *   0 otherwise
  */
-static void create_one_file(struct apply_state *state,
-                           char *path,
-                           unsigned mode,
-                           const char *buf,
-                           unsigned long size)
+static int create_one_file(struct apply_state *state,
+                          char *path,
+                          unsigned mode,
+                          const char *buf,
+                          unsigned long size)
 {
        int res;
 
        if (state->cached)
-               return;
+               return 0;
 
        res = try_create_file(path, mode, buf, size);
        if (res < 0)
-               exit(128);
+               return -1;
        if (!res)
-               return;
+               return 0;
 
        if (errno == ENOENT) {
                if (safe_create_leading_directories(path))
-                       return;
+                       return 0;
                res = try_create_file(path, mode, buf, size);
                if (res < 0)
-                       exit(128);
+                       return -1;
                if (!res)
-                       return;
+                       return 0;
        }
 
        if (errno == EEXIST || errno == EACCES) {
@@ -4243,10 +4247,10 @@ static void create_one_file(struct apply_state *state,
                        mksnpath(newpath, sizeof(newpath), "%s~%u", path, nr);
                        res = try_create_file(newpath, mode, buf, size);
                        if (res < 0)
-                               exit(128);
+                               return -1;
                        if (!res) {
                                if (!rename(newpath, path))
-                                       return;
+                                       return 0;
                                unlink_or_warn(newpath);
                                break;
                        }
@@ -4255,7 +4259,8 @@ static void create_one_file(struct apply_state *state,
                        ++nr;
                }
        }
-       die_errno(_("unable to write file '%s' mode %o"), path, mode);
+       return error_errno(_("unable to write file '%s' mode %o"),
+                          path, mode);
 }
 
 static int add_conflicted_stages_file(struct apply_state *state,
@@ -4300,7 +4305,8 @@ static int create_file(struct apply_state *state, struct 
patch *patch)
 
        if (!mode)
                mode = S_IFREG | 0644;
-       create_one_file(state, path, mode, buf, size);
+       if (create_one_file(state, path, mode, buf, size))
+               return -1;
 
        if (patch->conflicted_threeway)
                return add_conflicted_stages_file(state, patch);
-- 
2.10.0.41.g9df52c3