common/renameat2

   1 ##/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3 # Copyright (c) 2014 Miklos Szeredi.  All Rights Reserved.
   4 #
   5 # renameat2 helpers
   6
   7 # Setup source or dest
   8 #
   9 _setup_one()
  10 {
  11         local path=$1
  12         local type=$2
  13
  14         case $type in
  15                 none)   ;;
  16                 regu)   echo foo > $path;;
  17                 symb)   ln -s foo $path;;
  18                 dire)   mkdir $path;;
  19                 tree)   mkdir $path; echo foo > $path/bar;;
  20         esac
  21 }
  22
  23 #
  24 # Cleanup source or dest
  25 #
  26 _cleanup_one()
  27 {
  28         local path=$1
  29
  30         if test -d $path; then
  31                 rm -f $path/bar
  32                 rmdir $path
  33         else
  34                 rm -f $path
  35         fi
  36 }
  37
  38 #
  39 # Check type of source or destination
  40 #
  41 _showtype_one()
  42 {
  43         local path=$1
  44
  45         if test -e $path -o -h $path; then
  46                 if test -d $path -a -e $path/bar; then
  47                         echo -n "tree"
  48                 else
  49                         echo -n `stat -c %F $path | cut -b-4`
  50                 fi
  51         else
  52                 echo -n "none"
  53         fi
  54 }
  55
  56 #
  57 # This runs renameat2 on all combinations of source and dest
  58 #
  59 _rename_tests_source_dest()
  60 {
  61         local source=$1
  62         local dest=$2
  63         local options=$3
  64         local flags=$4
  65
  66         for stype in none regu symb dire tree; do
  67                 for dtype in none regu symb dire tree; do
  68                         echo -n "$options $stype/$dtype -> "
  69                         _setup_one $source $stype
  70                         _setup_one $dest $dtype
  71                         $here/src/renameat2 $source $dest $flags
  72                         if test $? == 0; then
  73                                 _showtype_one $source
  74                                 echo -n "/"
  75                                 _showtype_one $dest
  76                                 echo "."
  77                         fi
  78                         _cleanup_one $source
  79                         _cleanup_one $dest
  80                 done
  81         done
  82 }
  83
  84 #
  85 # This runs _rename_tests_source_dest() for both same-directory and
  86 # cross-directory renames
  87 #
  88 _rename_tests()
  89 {
  90         local testdir=$1
  91         local flags=$2
  92
  93         #same directory renames
  94         _rename_tests_source_dest $testdir/src $testdir/dst     "samedir " $flags
  95
  96         #cross directory renames
  97         mkdir $testdir/x $testdir/y
  98         _rename_tests_source_dest $testdir/x/src $testdir/y/dst "crossdir" $flags
  99         rmdir $testdir/x $testdir/y
 100 }
 101
 102 #
 103 # This checks whether the renameat2 syscall is supported
 104 #
 105 _require_renameat2()
 106 {
 107         local flags=$1
 108         local rename_dir=`mktemp -d -p $TEST_DIR`
 109         local cmd=""
 110
 111         if test ! -x $here/src/renameat2; then
 112                 _notrun "renameat2 binary not found"
 113         fi
 114
 115         touch $rename_dir/foo
 116         case $flags in
 117         "noreplace")
 118                 cmd="-n $rename_dir/foo $rename_dir/bar"
 119                 ;;
 120         "exchange")
 121                 touch $rename_dir/bar
 122                 cmd="-x $rename_dir/foo $rename_dir/bar"
 123                 ;;
 124         "whiteout")
 125                 touch $rename_dir/bar
 126                 cmd="-w $rename_dir/foo $rename_dir/bar"
 127                 ;;
 128         "")
 129                 cmd=""
 130                 ;;
 131         *)
 132                 rm -rf $rename_dir
 133                 _fail "_require_renameat2: only support noreplace,exchange,whiteout rename flags"
 134                 ;;
 135         esac
 136         if ! $here/src/renameat2 -t $cmd; then
 137                 rm -rf $rename_dir
 138                 _notrun "kernel doesn't support renameat2 syscall"
 139         fi
 140         rm -rf $rename_dir
 141 }