enum { IO_SIZE = 32 * 1024 };
-void
-copy_file_preserving (const char *src_filename, const char *dest_filename)
+int
+qcopy_file_preserving (const char *src_filename, const char *dest_filename)
{
+ int err = 0;
int src_fd;
struct stat statbuf;
int mode;
char *buf = xmalloc (IO_SIZE);
src_fd = open (src_filename, O_RDONLY | O_BINARY);
- if (src_fd < 0 || fstat (src_fd, &statbuf) < 0)
- error (EXIT_FAILURE, errno, _("error while opening %s for reading"),
- quote (src_filename));
+ if (src_fd < 0)
+ {
+ err = GL_COPY_ERR_OPEN_READ;
+ goto error;
+ }
+ if (fstat (src_fd, &statbuf) < 0)
+ {
+ err = GL_COPY_ERR_OPEN_READ;
+ goto error_src;
+ }
mode = statbuf.st_mode & 07777;
dest_fd = open (dest_filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0600);
if (dest_fd < 0)
- error (EXIT_FAILURE, errno, _("cannot open backup file %s for writing"),
- quote (dest_filename));
+ {
+ err = GL_COPY_ERR_OPEN_BACKUP_WRITE;
+ goto error_src;
+ }
/* Copy the file contents. */
for (;;)
{
size_t n_read = safe_read (src_fd, buf, IO_SIZE);
if (n_read == SAFE_READ_ERROR)
- error (EXIT_FAILURE, errno, _("error reading %s"),
- quote (src_filename));
+ {
+ err = GL_COPY_ERR_READ;
+ goto error_src_dest;
+ }
if (n_read == 0)
break;
if (full_write (dest_fd, buf, n_read) < n_read)
- error (EXIT_FAILURE, errno, _("error writing %s"),
- quote (est_filename));
+ {
+ err = GL_COPY_ERR_WRITE;
+ goto error_src_dest;
+ }
}
free (buf);
#if !USE_ACL
if (close (dest_fd) < 0)
- error (EXIT_FAILURE, errno, _("error writing %s"), quote (dest_filename));
+ {
+ err = GL_COPY_ERR_WRITE;
+ goto error_src;
+ }
if (close (src_fd) < 0)
- error (EXIT_FAILURE, errno, _("error after reading %s"),
- quote (src_filename));
+ {
+ err = GL_COPY_ERR_AFTER_READ;
+ goto error;
+ }
#endif
/* Preserve the access and modification times. */
switch (qcopy_acl (src_filename, src_fd, dest_filename, dest_fd, mode))
{
case -2:
- error (EXIT_FAILURE, errno, "%s", quote (src_filename));
+ err = GL_COPY_ERR_GET_ACL;
+ goto error_src_dest;
case -1:
- error (EXIT_FAILURE, errno, _("preserving permissions for %s"),
- quote (dest_filename));
+ err = GL_COPY_ERR_SET_ACL;
+ goto error_src_dest;
}
#else
chmod (dest_filename, mode);
#if USE_ACL
if (close (dest_fd) < 0)
- error (EXIT_FAILURE, errno, _("error writing %s"), quote (dest_filename));
+ {
+ err = GL_COPY_ERR_WRITE;
+ goto error_src;
+ }
if (close (src_fd) < 0)
- error (EXIT_FAILURE, errno, _("error after reading %s"),
- quote (src_filename));
+ {
+ err = GL_COPY_ERR_AFTER_READ;
+ goto error;
+ }
#endif
+
+ return 0;
+
+ error_src_dest:
+ close (dest_fd);
+ error_src:
+ close (src_fd);
+ error:
+ return err;
+}
+
+void
+copy_file_preserving (const char *src_filename, const char *dest_filename)
+{
+ switch (qcopy_file_preserving (src_filename, dest_filename))
+ {
+ case 0:
+ return;
+
+ case GL_COPY_ERR_OPEN_READ:
+ error (EXIT_FAILURE, errno, _("error while opening %s for reading"),
+ quote (src_filename));
+
+ case GL_COPY_ERR_OPEN_BACKUP_WRITE:
+ error (EXIT_FAILURE, errno, _("cannot open backup file %s for writing"),
+ quote (dest_filename));
+
+ case GL_COPY_ERR_READ:
+ error (EXIT_FAILURE, errno, _("error reading %s"),
+ quote (src_filename));
+
+ case GL_COPY_ERR_WRITE:
+ error (EXIT_FAILURE, errno, _("error writing %s"),
+ quote (dest_filename));
+
+ case GL_COPY_ERR_AFTER_READ:
+ error (EXIT_FAILURE, errno, _("error after reading %s"),
+ quote (src_filename));
+
+ case GL_COPY_ERR_GET_ACL:
+ error (EXIT_FAILURE, errno, "%s", quote (src_filename));
+
+ case GL_COPY_ERR_SET_ACL:
+ error (EXIT_FAILURE, errno, _("preserving permissions for %s"),
+ quote (dest_filename));
+
+ default:
+ abort ();
+ }
}
#endif
+/* Error codes returned by qcopy_file_preserving. */
+enum
+{
+ GL_COPY_ERR_OPEN_READ = -1,
+ GL_COPY_ERR_OPEN_BACKUP_WRITE = -2,
+ GL_COPY_ERR_READ = -3,
+ GL_COPY_ERR_WRITE = -4,
+ GL_COPY_ERR_AFTER_READ = -5,
+ GL_COPY_ERR_GET_ACL = -6,
+ GL_COPY_ERR_SET_ACL = -7
+};
+
+/* Copy a regular file: from src_filename to dest_filename.
+ The destination file is assumed to be a backup file.
+ Modification times, owner, group and access permissions are preserved as
+ far as possible.
+ Return 0 if successful, otherwise set errno and return one of the error
+ codes above. */
+extern int qcopy_file_preserving (const char *src_filename, const char *dest_filename);
+
/* Copy a regular file: from src_filename to dest_filename.
The destination file is assumed to be a backup file.
Modification times, owner, group and access permissions are preserved as