[libglnx] Port most code (except fdio) to new style

[Colin Walters <walters src gnome org>]

commit 47fafa97e97eb4fcf32bf73db0cb3752e510b8f3
Author: Colin Walters <walters verbum org>
Date:   Tue Apr 25 10:30:05 2017 -0400

    Port most code (except fdio) to new style
    
    There's a lot more fdio code, starting with some of the easier ones.

 glnx-dirfd.c    |   12 ++------
 glnx-lockfile.c |   23 +++++-----------
 glnx-shutil.c   |   76 +++++++++++++++---------------------------------------
 3 files changed, 31 insertions(+), 80 deletions(-)
---
diff --git a/glnx-dirfd.c b/glnx-dirfd.c
index 8c43720..12b983c 100644
--- a/glnx-dirfd.c
+++ b/glnx-dirfd.c
@@ -209,13 +209,12 @@ glnx_dirfd_iterator_next_dent_ensure_dtype (GLnxDirFdIterator  *dfd_iter,
                                             GCancellable       *cancellable,
                                             GError            **error)
 {
-  gboolean ret = FALSE;
   struct dirent *ret_dent;
 
   g_return_val_if_fail (out_dent, FALSE);
 
   if (!glnx_dirfd_iterator_next_dent (dfd_iter, out_dent, cancellable, error))
-    goto out;
+    return FALSE;
 
   ret_dent = *out_dent;
 
@@ -226,17 +225,12 @@ glnx_dirfd_iterator_next_dent_ensure_dtype (GLnxDirFdIterator  *dfd_iter,
         {
           struct stat stbuf;
           if (TEMP_FAILURE_RETRY (fstatat (dfd_iter->fd, ret_dent->d_name, &stbuf, AT_SYMLINK_NOFOLLOW)) != 
0)
-            {
-              glnx_set_error_from_errno (error);
-              goto out;
-            }
+            return glnx_throw_errno (error);
           ret_dent->d_type = IFTODT (stbuf.st_mode);
         }
     }
 
-  ret = TRUE;
- out:
-  return ret;
+  return TRUE;
 }
 
 /**
diff --git a/glnx-lockfile.c b/glnx-lockfile.c
index 7dd69e9..c1cfc6b 100644
--- a/glnx-lockfile.c
+++ b/glnx-lockfile.c
@@ -61,7 +61,6 @@
  */
 gboolean
 glnx_make_lock_file(int dfd, const char *p, int operation, GLnxLockFile *out_lock, GError **error) {
-        gboolean ret = FALSE;
         glnx_fd_close int fd = -1;
         g_autofree char *t = NULL;
         int r;
@@ -89,10 +88,8 @@ glnx_make_lock_file(int dfd, const char *p, int operation, GLnxLockFile *out_loc
                 struct stat st;
 
                 fd = openat(dfd, p, O_CREAT|O_RDWR|O_NOFOLLOW|O_CLOEXEC|O_NOCTTY, 0600);
-                if (fd < 0) {
-                        glnx_set_error_from_errno(error);
-                        goto out;
-                }
+                if (fd < 0)
+                        return glnx_throw_errno(error);
 
                 /* Unfortunately, new locks are not in RHEL 7.1 glibc */
 #ifdef F_OFD_SETLK
@@ -107,10 +104,8 @@ glnx_make_lock_file(int dfd, const char *p, int operation, GLnxLockFile *out_loc
                         if (errno == EINVAL)
                                 r = flock(fd, operation);
 
-                        if (r < 0) {
-                                glnx_set_error_from_errno(error);
-                                goto out;
-                        }
+                        if (r < 0)
+                                return glnx_throw_errno(error);
                 }
 
                 /* If we acquired the lock, let's check if the file
@@ -120,10 +115,8 @@ glnx_make_lock_file(int dfd, const char *p, int operation, GLnxLockFile *out_loc
                  * hence try again. */
 
                 r = fstat(fd, &st);
-                if (r < 0) {
-                        glnx_set_error_from_errno(error);
-                        goto out;
-                }
+                if (r < 0)
+                        return glnx_throw_errno(error);
                 if (st.st_nlink > 0)
                         break;
 
@@ -142,9 +135,7 @@ glnx_make_lock_file(int dfd, const char *p, int operation, GLnxLockFile *out_loc
         fd = -1;
         t = NULL;
 
-        ret = TRUE;
- out:
-        return ret;
+        return TRUE;
 }
 
 void glnx_release_lock_file(GLnxLockFile *f) {
diff --git a/glnx-shutil.c b/glnx-shutil.c
index 4c62ba2..6a1cdd4 100644
--- a/glnx-shutil.c
+++ b/glnx-shutil.c
@@ -31,14 +31,12 @@ glnx_shutil_rm_rf_children (GLnxDirFdIterator    *dfd_iter,
                             GCancellable       *cancellable,
                             GError            **error)
 {
-  gboolean ret = FALSE;
   struct dirent *dent;
 
   while (TRUE)
     {
       if (!glnx_dirfd_iterator_next_dent_ensure_dtype (dfd_iter, &dent, cancellable, error))
-        goto out;
-
+        return FALSE;
       if (dent == NULL)
         break;
 
@@ -48,33 +46,25 @@ glnx_shutil_rm_rf_children (GLnxDirFdIterator    *dfd_iter,
 
           if (!glnx_dirfd_iterator_init_at (dfd_iter->fd, dent->d_name, FALSE,
                                             &child_dfd_iter, error))
-            goto out;
+            return FALSE;
 
           if (!glnx_shutil_rm_rf_children (&child_dfd_iter, cancellable, error))
-            goto out;
+            return FALSE;
 
           if (unlinkat (dfd_iter->fd, dent->d_name, AT_REMOVEDIR) == -1)
-            {
-              glnx_set_error_from_errno (error);
-              goto out;
-            }
+            return glnx_throw_errno_prefix (error, "unlinkat");
         }
       else
         {
           if (unlinkat (dfd_iter->fd, dent->d_name, 0) == -1)
             {
               if (errno != ENOENT)
-                {
-                  glnx_set_error_from_errno (error);
-                  goto out;
-                }
+                return glnx_throw_errno_prefix (error, "unlinkat");
             }
         }
     }
 
-  ret = TRUE;
- out:
-  return ret;
+  return TRUE;
 }
 
 /**
@@ -94,7 +84,6 @@ glnx_shutil_rm_rf_at (int                   dfd,
                       GCancellable         *cancellable,
                       GError              **error)
 {
-  gboolean ret = FALSE;
   glnx_fd_close int target_dfd = -1;
   g_auto(GLnxDirFdIterator) dfd_iter = { 0, };
 
@@ -114,40 +103,28 @@ glnx_shutil_rm_rf_at (int                   dfd,
       else if (errsv == ENOTDIR || errsv == ELOOP)
         {
           if (unlinkat (dfd, path, 0) != 0)
-            {
-              glnx_set_error_from_errno (error);
-              goto out;
-            }
+            return glnx_throw_errno_prefix (error, "unlinkat");
         }
       else
-        {
-          glnx_set_error_from_errno (error);
-          goto out;
-        }
+        return glnx_throw_errno_prefix (error, "open(%s)", path);
     }
   else
     {
       if (!glnx_dirfd_iterator_init_take_fd (target_dfd, &dfd_iter, error))
-        goto out;
+        return FALSE;
       target_dfd = -1;
 
       if (!glnx_shutil_rm_rf_children (&dfd_iter, cancellable, error))
-        goto out;
+        return FALSE;
 
       if (unlinkat (dfd, path, AT_REMOVEDIR) == -1)
         {
-          int errsv = errno;
-          if (errsv != ENOENT)
-            {
-              glnx_set_error_from_errno (error);
-              goto out;
-            }
+          if (errno != ENOENT)
+            return glnx_throw_errno_prefix (error, "unlinkat");
         }
     }
 
-  ret = TRUE;
- out:
-  return ret;
+  return TRUE;
 }
 
 static gboolean
@@ -157,11 +134,10 @@ mkdir_p_at_internal (int              dfd,
                      GCancellable    *cancellable,
                      GError         **error)
 {
-  gboolean ret = FALSE;
   gboolean did_recurse = FALSE;
 
   if (g_cancellable_set_error_if_cancelled (cancellable, error))
-    goto out;
+    return FALSE;
 
  again:
   if (mkdirat (dfd, path, mode) == -1)
@@ -179,7 +155,7 @@ mkdir_p_at_internal (int              dfd,
 
           if (!glnx_shutil_mkdir_p_at (dfd, path, mode,
                                        cancellable, error))
-            goto out;
+            return FALSE;
 
           /* Now restore it for another mkdir attempt */
           *lastslash = '/';
@@ -194,15 +170,10 @@ mkdir_p_at_internal (int              dfd,
            */
         }
       else
-        {
-          glnx_set_error_from_errno (error);
-          goto out;
-        }
+        return glnx_throw_errno_prefix (error, "mkdir(%s)", path);
     }
 
-  ret = TRUE;
- out:
-  return ret;
+  return TRUE;
 }
 
 /**
@@ -223,28 +194,23 @@ glnx_shutil_mkdir_p_at (int                   dfd,
                         GCancellable         *cancellable,
                         GError              **error)
 {
-  gboolean ret = FALSE;
   struct stat stbuf;
   char *buf;
 
   /* Fast path stat to see whether it already exists */
   if (fstatat (dfd, path, &stbuf, AT_SYMLINK_NOFOLLOW) == 0)
     {
+      /* Note early return */
       if (S_ISDIR (stbuf.st_mode))
-        {
-          ret = TRUE;
-          goto out;
-        }
+        return TRUE;
     }
 
   buf = strdupa (path);
 
   if (!mkdir_p_at_internal (dfd, buf, mode, cancellable, error))
-    goto out;
+    return FALSE;
 
-  ret = TRUE;
- out:
-  return ret;
+  return TRUE;
 }
 
 /**