common/casefold

   1 # SPDX-License-Identifier: GPL-2.0+
   2 # Copyright (c) 2019 Collabora, Ltd.  All Rights Reserved.
   3 #
   4 # Common functions for testing filename casefold feature
   5
   6 _has_casefold_kernel_support()
   7 {
   8         case $FSTYP in
   9         ext4)
  10                 test -f '/sys/fs/ext4/features/casefold'
  11                 ;;
  12         *)
  13                 # defaults to unsupported
  14                 false
  15                 ;;
  16         esac
  17 }
  18
  19 _require_scratch_casefold()
  20 {
  21         if ! _has_casefold_kernel_support ; then
  22                 _notrun "$FSTYP does not support casefold feature"
  23         fi
  24
  25         if ! _scratch_mkfs_casefold &>>seqres.full; then
  26                 _notrun "$FSTYP userspace tools do not support casefold"
  27         fi
  28
  29         # Make sure the kernel can mount a filesystem with the encoding
  30         # defined by the userspace tools.  This will fail if
  31         # the userspace tool used a more recent encoding than the one
  32         # supported in kernel space.
  33         if ! _try_scratch_mount &>>seqres.full; then
  34                 _notrun "kernel can't mount filesystem with the encoding set by userspace"
  35         fi
  36         _scratch_unmount
  37
  38         # utilities used by casefold
  39         _require_command "$CHATTR_PROG" chattr
  40         _require_command "$LSATTR_PROG" lsattr
  41 }
  42
  43 _scratch_mkfs_casefold()
  44 {
  45         case $FSTYP in
  46         ext4)
  47                 _scratch_mkfs -O casefold $*
  48                 ;;
  49         *)
  50                 _notrun "Don't know how to mkfs with casefold support on $FSTYP"
  51                 ;;
  52         esac
  53 }
  54
  55 _scratch_mkfs_casefold_strict()
  56 {
  57         case $FSTYP in
  58         ext4)
  59                 _scratch_mkfs -O casefold -E encoding_flags=strict
  60                 ;;
  61         *)
  62                 _notrun "Don't know how to mkfs with casefold-strict support on $FSTYP"
  63                 ;;
  64         esac
  65 }
  66
  67 # To get the exact disk name, we need some method that does a
  68 # getdents() on the parent directory, such that we don't get
  69 # normalized/casefolded results.  'Find' works ok.
  70 _casefold_check_exact_name()
  71 {
  72         local basedir=$1
  73         local exact_name=$2
  74         find ${basedir} | grep -q ${exact_name}
  75 }
  76
  77 _casefold_set_attr()
  78 {
  79         $CHATTR_PROG +F "${1}"
  80 }
  81
  82 _casefold_unset_attr()
  83 {
  84         $CHATTR_PROG -F "${1}"
  85 }
  86
  87 _casefold_lsattr_dir()
  88 {
  89         $LSATTR_PROG -ld "${1}" | _filter_spaces
  90 }