Add checks for both mkfs.vfat and the vfat file system in the kernel before
running tests.

Upstream-Status: Submitted [https://alioth-lists.debian.net/pipermail/parted-devel/2021-August/005653.html]
Signed-off-by: Ross Burton <ross.burton@arm.com>

diff --git a/tests/t-lib-helpers.sh b/tests/t-lib-helpers.sh
index 4c6c75f..2cc7577 100644
--- a/tests/t-lib-helpers.sh
+++ b/tests/t-lib-helpers.sh
@@ -418,3 +418,13 @@ require_64bit_()
           ;;
   esac
 }
+
+# Check if the specified filesystem is either built into the kernel, or can be loaded
+# as a module
+# Usage: has_filesystem vfat
+# Ruturns 0 if the filesystem is available, otherwise skips the test
+require_filesystem_()
+{
+  grep -q $1 /proc/filesystems && return 0
+  modprobe --quiet --dry-run $1 || skip_ "this test requires kernel support for $1"
+}
diff --git a/tests/t1100-busy-label.sh b/tests/t1100-busy-label.sh
index f1a13df..0f47b08 100755
--- a/tests/t1100-busy-label.sh
+++ b/tests/t1100-busy-label.sh
@@ -19,6 +19,9 @@
 . "${srcdir=.}/init.sh"; path_prepend_ ../parted
 require_root_
 require_scsi_debug_module_
+require_fat_
+require_filesystem_ vfat
+
 ss=$sector_size_
 
 scsi_debug_setup_ sector_size=$ss dev_size_mb=90 > dev-name ||
diff --git a/tests/t1101-busy-partition.sh b/tests/t1101-busy-partition.sh
index e35e6f0..c813848 100755
--- a/tests/t1101-busy-partition.sh
+++ b/tests/t1101-busy-partition.sh
@@ -22,6 +22,8 @@ test "$VERBOSE" = yes && parted --version
 
 require_root_
 require_scsi_debug_module_
+require_fat_
+require_filesystem_ vfat
 
 # create memory-backed device
 scsi_debug_setup_ dev_size_mb=80 > dev-name ||