tests/avocado/virtiofs_submounts.py.data/guest.sh

   1 #!/bin/bash
   2
   3 function print_usage()
   4 {
   5     if [ -n "$2" ]; then
   6         echo "Error: $2"
   7         echo
   8     fi
   9     echo "Usage: $1 <shared dir>"
  10     echo '(The shared directory is the "share" directory in the scratch' \
  11          'directory)'
  12 }
  13
  14 shared_dir=$1
  15 if [ -z "$shared_dir" ]; then
  16     print_usage "$0" 'Shared dir not given' >&2
  17     exit 1
  18 fi
  19
  20 cd "$shared_dir"
  21
  22 # FIXME: This should not be necessary, but it is.  In order for all
  23 # submounts to be proper mount points, we need to visit them.
  24 # (Before we visit them, they will not be auto-mounted, and so just
  25 # appear as normal directories, with the catch that their st_ino will
  26 # be the st_ino of the filesystem they host, while the st_dev will
  27 # still be the st_dev of the parent.)
  28 # `find` does not work, because it will refuse to touch the mount
  29 # points as long as they are not mounted; their st_dev being shared
  30 # with the parent and st_ino just being the root node's inode ID
  31 # will practically ensure that this node exists elsewhere on the
  32 # filesystem, and `find` is required to recognize loops and not to
  33 # follow them.
  34 # Thus, we have to manually visit all nodes first.
  35
  36 mnt_i=0
  37
  38 function recursively_visit()
  39 {
  40     pushd "$1" >/dev/null
  41     for entry in *; do
  42         if [[ "$entry" == mnt* ]]; then
  43             mnt_i=$((mnt_i + 1))
  44             printf "Triggering auto-mount $mnt_i...\r"
  45         fi
  46
  47         if [ -d "$entry" ]; then
  48             recursively_visit "$entry"
  49         fi
  50     done
  51     popd >/dev/null
  52 }
  53
  54 recursively_visit .
  55 echo
  56
  57
  58 if [ -n "$(find -name not-mounted)" ]; then
  59     echo "Error: not-mounted files visible on mount points:" >&2
  60     find -name not-mounted >&2
  61     exit 1
  62 fi
  63
  64 if [ ! -f some-file -o "$(cat some-file)" != 'root' ]; then
  65     echo "Error: Bad file in the share root" >&2
  66     exit 1
  67 fi
  68
  69 shopt -s nullglob
  70
  71 function check_submounts()
  72 {
  73     local base_path=$1
  74
  75     for mp in mnt*; do
  76         printf "Checking submount %i...\r" "$((${#devs[@]} + 1))"
  77
  78         mp_i=$(echo "$mp" | sed -e 's/mnt//')
  79         dev=$(stat -c '%D' "$mp")
  80
  81         if [ -n "${devs[mp_i]}" ]; then
  82             echo "Error: $mp encountered twice" >&2
  83             exit 1
  84         fi
  85         devs[mp_i]=$dev
  86
  87         pushd "$mp" >/dev/null
  88         path="$base_path$mp"
  89         while true; do
  90             expected_content="$(printf '%s\n%s\n' "$mp_i" "$path")"
  91             if [ ! -f some-file ]; then
  92                 echo "Error: $PWD/some-file does not exist" >&2
  93                 exit 1
  94             fi
  95
  96             if [ "$(cat some-file)" != "$expected_content" ]; then
  97                 echo "Error: Bad content in $PWD/some-file:" >&2
  98                 echo '--- found ---'
  99                 cat some-file
 100                 echo '--- expected ---'
 101                 echo "$expected_content"
 102                 exit 1
 103             fi
 104             if [ "$(stat -c '%D' some-file)" != "$dev" ]; then
 105                 echo "Error: $PWD/some-file has the wrong device ID" >&2
 106                 exit 1
 107             fi
 108
 109             if [ -d sub ]; then
 110                 if [ "$(stat -c '%D' sub)" != "$dev" ]; then
 111                     echo "Error: $PWD/some-file has the wrong device ID" >&2
 112                     exit 1
 113                 fi
 114                 cd sub
 115                 path="$path/sub"
 116             else
 117                 if [ -n "$(echo mnt*)" ]; then
 118                     check_submounts "$path/"
 119                 fi
 120                 break
 121             fi
 122         done
 123         popd >/dev/null
 124     done
 125 }
 126
 127 root_dev=$(stat -c '%D' some-file)
 128 devs=()
 129 check_submounts ''
 130 echo
 131
 132 reused_devs=$(echo "$root_dev ${devs[@]}" | tr ' ' '\n' | sort | uniq -d)
 133 if [ -n "$reused_devs" ]; then
 134     echo "Error: Reused device IDs: $reused_devs" >&2
 135     exit 1
 136 fi
 137
 138 echo "Test passed for ${#devs[@]} submounts."