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|
#!/bin/bash
function print_usage()
{
if [ -n "$2" ]; then
echo "Error: $2"
echo
fi
echo "Usage: $1 <shared dir>"
echo '(The shared directory is the "share" directory in the scratch' \
'directory)'
}
shared_dir=$1
if [ -z "$shared_dir" ]; then
print_usage "$0" 'Shared dir not given' >&2
exit 1
fi
cd "$shared_dir"
# FIXME: This should not be necessary, but it is. In order for all
# submounts to be proper mount points, we need to visit them.
# (Before we visit them, they will not be auto-mounted, and so just
# appear as normal directories, with the catch that their st_ino will
# be the st_ino of the filesystem they host, while the st_dev will
# still be the st_dev of the parent.)
# `find` does not work, because it will refuse to touch the mount
# points as long as they are not mounted; their st_dev being shared
# with the parent and st_ino just being the root node's inode ID
# will practically ensure that this node exists elsewhere on the
# filesystem, and `find` is required to recognize loops and not to
# follow them.
# Thus, we have to manually visit all nodes first.
mnt_i=0
function recursively_visit()
{
pushd "$1" >/dev/null
for entry in *; do
if [[ "$entry" == mnt* ]]; then
mnt_i=$((mnt_i + 1))
printf "Triggering auto-mount $mnt_i...\r"
fi
if [ -d "$entry" ]; then
recursively_visit "$entry"
fi
done
popd >/dev/null
}
recursively_visit .
echo
if [ -n "$(find -name not-mounted)" ]; then
echo "Error: not-mounted files visible on mount points:" >&2
find -name not-mounted >&2
exit 1
fi
if [ ! -f some-file -o "$(cat some-file)" != 'root' ]; then
echo "Error: Bad file in the share root" >&2
exit 1
fi
shopt -s nullglob
function check_submounts()
{
local base_path=$1
for mp in mnt*; do
printf "Checking submount %i...\r" "$((${#devs[@]} + 1))"
mp_i=$(echo "$mp" | sed -e 's/mnt//')
dev=$(stat -c '%D' "$mp")
if [ -n "${devs[mp_i]}" ]; then
echo "Error: $mp encountered twice" >&2
exit 1
fi
devs[mp_i]=$dev
pushd "$mp" >/dev/null
path="$base_path$mp"
while true; do
expected_content="$(printf '%s\n%s\n' "$mp_i" "$path")"
if [ ! -f some-file ]; then
echo "Error: $PWD/some-file does not exist" >&2
exit 1
fi
if [ "$(cat some-file)" != "$expected_content" ]; then
echo "Error: Bad content in $PWD/some-file:" >&2
echo '--- found ---'
cat some-file
echo '--- expected ---'
echo "$expected_content"
exit 1
fi
if [ "$(stat -c '%D' some-file)" != "$dev" ]; then
echo "Error: $PWD/some-file has the wrong device ID" >&2
exit 1
fi
if [ -d sub ]; then
if [ "$(stat -c '%D' sub)" != "$dev" ]; then
echo "Error: $PWD/some-file has the wrong device ID" >&2
exit 1
fi
cd sub
path="$path/sub"
else
if [ -n "$(echo mnt*)" ]; then
check_submounts "$path/"
fi
break
fi
done
popd >/dev/null
done
}
root_dev=$(stat -c '%D' some-file)
devs=()
check_submounts ''
echo
reused_devs=$(echo "$root_dev ${devs[@]}" | tr ' ' '\n' | sort | uniq -d)
if [ -n "$reused_devs" ]; then
echo "Error: Reused device IDs: $reused_devs" >&2
exit 1
fi
echo "Test passed for ${#devs[@]} submounts."
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