[PATCH v3 1/2] common/casefold: Add infrastructure to test filename casefold feature

Gabriel Krisman Bertazi
2019-06-10T17:35:49Z

Add a set of basic helper functions to simplify the testing of
casefolding capable filesystems.

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
---
common/casefold | 92 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 92 insertions(+)
create mode 100644 common/casefold

diff --git a/common/casefold b/common/casefold
new file mode 100644
index 000000000000..43f2d77d706c
--- /dev/null
+++ b/common/casefold
@@ -0,0 +1,92 @@
+# SPDX-License-Identifier: GPL-2.0+
+# Copyright (c) 2019 Collabora, Ltd. All Rights Reserved.
+#
+# Common functions for testing filename casefold feature
+
+_has_casefold_kernel_support()
+{
+ case $FSTYP in
+ ext4)
+ test -f '/sys/fs/ext4/features/casefold'
+ ;;
+ *)
+ # defaults to unsupported
+ false
+ ;;
+ esac
+}
+
+_require_scratch_casefold()
+{
+ if ! _has_casefold_kernel_support ; then
+ _notrun "$FSTYP does not support casefold feature"
+ fi
+
+ if ! _scratch_mkfs_casefold &>>seqres.full; then
+ _notrun "$FSTYP userspace tools do not support casefold"
+ fi
+
+ # Make sure the kernel can mount a filesystem with the encoding
+ # defined by the userspace tools. This will fail if
+ # the userspace tool used a more recent encoding than the one
+ # supported in kernel space.
+ if ! _try_scratch_mount &>>seqres.full; then
+ _notrun \
+ "kernel can't mount filesystem with the encoding set by userspace"
+ fi
+ _scratch_unmount
+
+ # utilities used by casefold
+ _require_command "$CHATTR_PROG" chattr
+ _require_command "$LSATTR_PROG" lsattr
+}
+
+_scratch_mkfs_casefold()
+{
+ case $FSTYP in
+ ext4)
+ _scratch_mkfs -O casefold $*
+ ;;
+ *)
+ _notrun "Don't know how to mkfs with casefold support on $FSTYP"
+ ;;
+ esac
+}
+
+_scratch_mkfs_casefold_strict()
+{
+ case $FSTYP in
+ ext4)
+ _scratch_mkfs -O casefold -E encoding_flags=strict
+ ;;
+ *)
+ _notrun \
+ "Don't know how to mkfs with casefold-strict support on $FSTYP"
+ ;;
+ esac
+}
+
+# To get the exact disk name, we need some method that does a
+# getdents() on the parent directory, such that we don't get
+# normalized/casefolded results. 'Find' works ok.
+_casefold_check_exact_name()
+{
+ local basedir=$1
+ local exact_name=$2
+ find ${basedir} | grep -q ${exact_name}
+}
+
+_casefold_set_attr()
+{
+ $CHATTR_PROG +F "${1}"
+}
+
+_casefold_unset_attr()
+{
+ $CHATTR_PROG -F "${1}"
+}
+
+_casefold_lsattr_dir()
+{
+ $LSATTR_PROG -ld "${1}"
+}
--
2.20.1