deploy: Port some functions to new style

There are a number of simple ports here.  Prep for further work
in `/etc` merge.

I also stripped trailing whitespace globally.

Closes: #996
Approved by: jlebon

src/libostree/ostree-sysroot-deploy.c

@@ -52,8 +52,6 @@ symlink_at_replace (const char    *oldpath,
                     GCancellable  *cancellable,
                     GError       **error)
 {
-  gboolean ret = FALSE;
-  int res;
   /* Possibly in the future generate a temporary random name here,
    * would need to move "generate a temporary name" code into
    * libglnx or glib?
@@ -64,22 +62,14 @@ symlink_at_replace (const char    *oldpath,
   (void) unlinkat (parent_dfd, temppath, 0);
 
   /* Create the temp link */
-  do
+  if (TEMP_FAILURE_RETRY (symlinkat (oldpath, parent_dfd, temppath)) < 0)
-    res = symlinkat (oldpath, parent_dfd, temppath);
+    return glnx_throw_errno_prefix (error, "symlinkat");
-  while (G_UNLIKELY (res == -1 && errno == EINTR));
-  if (res == -1)
-    {
-      glnx_set_error_from_errno (error);
-      goto out;
-    }
 
   /* Rename it into place */
   if (!glnx_renameat (parent_dfd, temppath, parent_dfd, newpath, error))
-    goto out;
+    return FALSE;
 
-  ret = TRUE;
+  return TRUE;
- out:
-  return ret;
 }
 
 static GLnxFileCopyFlags
@@ -104,26 +94,17 @@ hardlink_or_copy_at (int         src_dfd,
                      GCancellable  *cancellable,
                      GError       **error)
 {
-  gboolean ret = FALSE;
-
   if (linkat (src_dfd, src_subpath, dest_dfd, dest_subpath, 0) != 0)
     {
-      if (errno == EMLINK || errno == EXDEV)
+      if (G_IN_SET (errno, EMLINK, EXDEV))
-        {
         return glnx_file_copy_at (src_dfd, src_subpath, NULL, dest_dfd, dest_subpath,
                                   sysroot_flags_to_copy_flags (0, flags),
                                   cancellable, error);
-        }
       else
-        {
+        return glnx_throw_errno_prefix (error, "linkat");
-          glnx_set_error_from_errno (error);
-          goto out;
-        }
     }
 
-  ret = TRUE;
+  return TRUE;
- out:
-  return ret;
 }
 
 static gboolean
@@ -135,8 +116,6 @@ dirfd_copy_attributes_and_xattrs (int            src_parent_dfd,
                                   GCancellable  *cancellable,
                                   GError       **error)
 {
-  gboolean ret = FALSE;
-  struct stat src_stbuf;
   g_autoptr(GVariant) xattrs = NULL;
 
   /* Clone all xattrs first, so we get the SELinux security context
@@ -147,31 +126,21 @@ dirfd_copy_attributes_and_xattrs (int            src_parent_dfd,
     {
       if (!glnx_dfd_name_get_all_xattrs (src_parent_dfd, src_name,
                                          &xattrs, cancellable, error))
-        goto out;
+        return FALSE;
       if (!glnx_fd_set_all_xattrs (dest_dfd, xattrs,
                                    cancellable, error))
-        goto out;
+        return FALSE;
     }
 
-  if (fstat (src_dfd, &src_stbuf) != 0)
+  struct stat src_stbuf;
-    {
+  if (!glnx_fstat (src_dfd, &src_stbuf, error))
-      glnx_set_error_from_errno (error);
+    return FALSE;
-      goto out;
-    }
   if (fchown (dest_dfd, src_stbuf.st_uid, src_stbuf.st_gid) != 0)
-    {
+    return glnx_throw_errno_prefix (error, "fchown");
-      glnx_set_error_from_errno (error);
-      goto out;
-    }
   if (fchmod (dest_dfd, src_stbuf.st_mode) != 0)
-    {
+    return glnx_throw_errno_prefix (error, "fchmod");
-      glnx_set_error_from_errno (error);
-      goto out;
-    }
 
-  ret = TRUE;
+  return TRUE;
- out:
-  return ret;
 }
 
 static gboolean
@@ -242,7 +211,6 @@ ensure_directory_from_template (int                 orig_etc_fd,
                                 GCancellable       *cancellable,
                                 GError            **error)
 {
-  gboolean ret = FALSE;
   glnx_fd_close int src_dfd = -1;
   glnx_fd_close int target_dfd = -1;
 
@@ -250,7 +218,7 @@ ensure_directory_from_template (int                 orig_etc_fd,
   g_assert (*path != '/' && *path != '\0');
 
   if (!glnx_opendirat (modified_etc_fd, path, TRUE, &src_dfd, error))
-    goto out;
+    return FALSE;
 
   /* Create with mode 0700, we'll fchmod/fchown later */
  again:
@@ -268,7 +236,7 @@ ensure_directory_from_template (int                 orig_etc_fd,
             {
               if (!ensure_directory_from_template (orig_etc_fd, modified_etc_fd, new_etc_fd,
                                                    parent_path, NULL, flags, cancellable, error))
-                goto out;
+                return FALSE;
 
               /* Loop */
               goto again;
@@ -280,29 +248,19 @@ ensure_directory_from_template (int                 orig_etc_fd,
             }
         }
       else
-        {
+        return glnx_throw_errno_prefix (error, "mkdirat");
-          glnx_set_error_from_errno (error);
-          g_prefix_error (error, "mkdirat: ");
-          goto out;
-        }
     }
 
   if (!glnx_opendirat (new_etc_fd, path, TRUE, &target_dfd, error))
-    goto out;
+    return FALSE;
 
   if (!dirfd_copy_attributes_and_xattrs (modified_etc_fd, path, src_dfd, target_dfd,
                                          flags, cancellable, error))
-    goto out;
+    return FALSE;
 
-  ret = TRUE;
   if (out_dfd)
-    {
+    *out_dfd = glnx_steal_fd (&target_dfd);
-      g_assert (target_dfd != -1);
+  return TRUE;
-      *out_dfd = target_dfd;
-      target_dfd = -1;
-    }
- out:
-  return ret;
 }
 
 /**
@@ -321,80 +279,62 @@ copy_modified_config_file (int                 orig_etc_fd,
                            GCancellable       *cancellable,
                            GError            **error)
 {
-  gboolean ret = FALSE;
   struct stat modified_stbuf;
   struct stat new_stbuf;
+
+  if (!glnx_fstatat (modified_etc_fd, path, &modified_stbuf, AT_SYMLINK_NOFOLLOW, error))
+    return glnx_prefix_error (error, "Reading modified config file");
+
   glnx_fd_close int dest_parent_dfd = -1;
-
-  if (fstatat (modified_etc_fd, path, &modified_stbuf, AT_SYMLINK_NOFOLLOW) < 0)
-    {
-      glnx_set_error_from_errno (error);
-      g_prefix_error (error, "Failed to read modified config file '%s': ", path);
-      goto out;
-    }
-
   if (strchr (path, '/') != NULL)
     {
       g_autofree char *parent = g_path_get_dirname (path);
 
       if (!ensure_directory_from_template (orig_etc_fd, modified_etc_fd, new_etc_fd,
                                            parent, &dest_parent_dfd, flags, cancellable, error))
-        goto out;
+        return FALSE;
     }
   else
     {
       dest_parent_dfd = dup (new_etc_fd);
       if (dest_parent_dfd == -1)
-        {
+        return glnx_throw_errno_prefix (error, "dup");
-          glnx_set_error_from_errno (error);
-          goto out;
-        }
     }
 
   g_assert (dest_parent_dfd != -1);
 
   if (fstatat (new_etc_fd, path, &new_stbuf, AT_SYMLINK_NOFOLLOW) < 0)
     {
-      if (errno == ENOENT)
+      if (errno != ENOENT)
-        ;
+        return glnx_throw_errno_prefix (error, "fstatat");
-      else
-        {
-          glnx_set_error_from_errno (error);
-          goto out;
-        }
     }
   else if (S_ISDIR(new_stbuf.st_mode))
     {
       if (!S_ISDIR(modified_stbuf.st_mode))
         {
-          g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND,
+          return g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND,
                               "Modified config file newly defaults to directory '%s', cannot merge",
-                       path);
+                              path), FALSE;
-          goto out;
         }
       else
         {
           /* Do nothing here - we assume that we've already
            * recursively copied the parent directory.
            */
-          ret = TRUE;
+          return TRUE;
-          goto out;
         }
     }
   else
     {
-      if (unlinkat (new_etc_fd, path, 0) < 0)
+      if (!glnx_unlinkat (new_etc_fd, path, 0, error))
-        {
+        return FALSE;
-          glnx_set_error_from_errno (error);
-          goto out;
-        }
     }
 
   if (S_ISDIR (modified_stbuf.st_mode))
     {
       if (!copy_dir_recurse (modified_etc_fd, new_etc_fd, path, flags,
                              cancellable, error))
-        goto out;
+        return FALSE;
     }
   else if (S_ISLNK (modified_stbuf.st_mode) || S_ISREG (modified_stbuf.st_mode))
     {
@@ -402,19 +342,16 @@ copy_modified_config_file (int                 orig_etc_fd,
                               new_etc_fd, path,
                               sysroot_flags_to_copy_flags (GLNX_FILE_COPY_OVERWRITE, flags),
                               cancellable, error))
-        goto out;
+        return FALSE;
     }
   else
     {
-      g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
+      return glnx_throw (error,
                          "Unsupported non-regular/non-symlink file in /etc '%s'",
                          path);
-      goto out;
     }
 
-  ret = TRUE;
+  return TRUE;
- out:
-  return ret;
 }
 
 /*