e2fsprogs/trunk/0001-mke2fs-fix-creating-a-file-system-image-w-o-a-pre-existing-file.patch

   1 commit 53464654bd33e58e3fff079f34261b823d839f3b
   2 Author: Theodore Ts'o <tytso@mit.edu>
   3 Date:   Mon Aug 2 21:08:01 2021 -0400
   4
   5     mke2fs: fix creating a file system image w/o a pre-existing file
   6
   7     The mke2fs program should allow creating a file system image when an
   8     explicit file system size is specified, even if the file doesn't yet
   9     exist.  By deferring the call to check_plausible() in commit
  10     942b00cb9d2f ("mke2fs: do not warn about a pre-existing partition
  11     table when using a non-zero offset") this behaviour was broken.
  12
  13     Fix this regression by explicitly creating the file if the file system
  14     size is specified.
  15
  16     Signed-off-by: Theodore Ts'o <tytso@mit.edu>
  17
  18 diff --git a/misc/mke2fs.c b/misc/mke2fs.c
  19 index 306064df..31e8de1a 100644
  20 --- a/misc/mke2fs.c
  21 +++ b/misc/mke2fs.c
  22 @@ -1986,6 +1986,25 @@ profile_error:
  23                 retval = ext2fs_get_device_size2(device_name,
  24                                                  EXT2_BLOCK_SIZE(&fs_param),
  25                                                  &dev_size);
  26 +       if (retval == ENOENT) {
  27 +               int fd;
  28 +
  29 +               if (!explicit_fssize) {
  30 +                       fprintf(stderr,
  31 +                               _("The file %s does not exist and no "
  32 +                                 "size was specified.\n"), device_name);
  33 +                       exit(1);
  34 +               }
  35 +               fd = ext2fs_open_file(device_name,
  36 +                                     O_CREAT | O_WRONLY, 0666);
  37 +               if (fd < 0) {
  38 +                       retval = errno;
  39 +               } else {
  40 +                       dev_size = 0;
  41 +                       retval = 0;
  42 +                       printf(_("Creating regular file %s\n"), device_name);
  43 +               }
  44 +       }
  45         if (retval && (retval != EXT2_ET_UNIMPLEMENTED)) {
  46                 com_err(program_name, retval, "%s",
  47                         _("while trying to determine filesystem size"));