#!/bin/bash
#
# Copyright 2008 Red Hat, Inc.
#
# This file is part of Cygwin.
#
# This software is a copyrighted work licensed under the terms of the
# Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
# details.
#
export PATH="/bin:$PATH"

SYSCONFDIR=/etc
FSTAB="${SYSCONFDIR}/fstab"
FSTABDIR="${SYSCONFDIR}/fstab.d"

DEVDIR=/dev

print_flags ()
{
  (( $1 & 0x0002 )) && echo -n "binary" || echo -n "text"
  (( $1 & 0x0010 )) && echo -n ",exec"
  (( $1 & 0x0040 )) && echo -n ",cygexec"
  (( $1 & 0x0100 )) && echo -n ",notexec"
  (( $1 & 0x0800 )) && echo -n ",managed"
}

# Create fstab file if it doesn't exist.
if [ -e "${FSTAB}" -a ! -f "${FSTAB}" ]
then
  # Try to move
  mv -f "${FSTAB}" "${FSTAB}.orig"
  if [ -e "${FSTAB}" -a ! -f "${FSTAB}" ]
  then
    echo
    echo "${FSTAB} is existant but not a file."
    echo "Since this file is specifying the mount points, this might"
    echo "result in unexpected trouble.  Please fix that manually."
    echo
  fi
fi

if [ ! -e "${FSTAB}" ]
then
  # Set IFS to just a LF
  _OLD_IFS="$IFS"
  IFS="
"
  for line in $(mount)
  do
    [[ "$line" =~ ([^ ]*)\ on\ ([^ ]*)\ type\ ([^ ]*)\ .* ]]
    if [ "${BASH_REMATCH[2]}" = "/" ]
    then
      CYGROOT="${BASH_REMATCH[1]}"
      FS_TYPE="${BASH_REMATCH[3]}"
      break
    fi
  done
  cat > ${FSTAB} << EOF
# The  file fstab contains descriptive information about the various file
# systems.  fstab is only read by programs, and not written;  it  is  the
# duty  of  the system administrator to properly create and maintain this
# file.  Each filesystem is described on a separate line; fields on  each
# line are separated by tabs or spaces.  Lines starting with '#' are com-
# ments.
#
# The first field, (fs_spec),  describes  the  block  special  device  or
# remote filesystem to be mounted.  On Cygwin, this is the native Windows
# path which  the mount point links in.  As path separator you MUST use a
# slash.  Usage of  a backslash might  lead to  unexpected  results.  UNC
# paths  (using  slashes,  not  backslashes)  are  allowed.  If  the path
# contains spaces these can be escaped as '\040'.
#
# The second field, (fs_file), describes the mount point for the filesys-
# tem.  If the  name  of  the  mount point contains  spaces these can be
# escaped as '\040'.
#
# The third field, (fs_vfstype), describes the type  of  the  filesystem.
# Cygwin supports any string here, since  the file system type is usually
# not  evaluated.  The  noticable  exception  is  the  file  system  type
# cygdrive.  This  type is  used to  set the  cygdrive  prefix.  See  the
# user's guide for more information about the cygdrive prefix.
#
# The  fourth  field, (fs_mntops), describes the mount options associated
# with  the filesystem.  It is  formatted as a  comma separated  list  of
# options.  It contains at least  the type of mount (binary or text) plus
# any additional options appropriate to  the filesystem type.  Recognized
# options are binary, text, nouser, user, exec, notexec, cygexec, nosuid,
# managed.  For a description of the options see  the user's guide.  Note
# that  nouser mount  points  are  not overridable  by  a  later  call to
# mount(2).  This is only  possible for user mount  points.  Mount points
# are by default nouser mount points, unless you specify the option user.
#
# The fifth (fs_freq) and sixth (fs_passno) field  are ignored.  They are
# so far only specified to keep a Linux-like fstab file layout.
#
# Note that  you don't have  to specify an fstab  entry for the root dir,
# unless you want  to have the  root dir pointing  to somewhere  entirely
# different (hopefully  you know what  you're doing), or  if you want  to
# mount the root dir with special options (for instance, as text mount).
#
# Example entries:
#
#   Just a normal mount point:
#
#       c:/foo /bar fat32 binary 0 0
#
#   A mount point for a managed, textmode mount:
#
#       C:/foo /bar/baz ntfs text,managed 0 0
#
#   A mount point for a Windows directory with spaces in it:
#
#       C:/Documents\040and\040Settings /docs ext3 binary 0 0
#
#   A mount point for a remote directory:
#
#       //server/share/subdir /srv/subdir smbfs binary 0 0
#
#   This is just a comment:
#
#       # This is just a comment
#
#   Set the cygdrive prefix to /mnt:
#
#       none /mnt cygdrive binary 0 0
#

EOF

  usr_bin=""
  usr_lib=""
  key='\HKLM\SOFTWARE\Cygnus Solutions\Cygwin\mounts v2'
  for subkey in $(regtool -q list "$key")
  do
    if [[ "$subkey" =~ /.* ]]
    then
      [ "$subkey" = "/usr/bin" ] && usr_bin="1"
      [ "$subkey" = "/usr/lib" ] && usr_lib="1"
      nat=$(regtool -q get "$key\\$subkey\native")
      nat="${nat//\\//}"
      nat="${nat// /\\040}"
      psx="${subkey// /\\040}"
      flags=$(regtool -q get "$key\\$subkey\flags")
      echo -n "${nat} ${psx} some_fs "
      print_flags $flags
      echo " 0 0"
    fi >> ${FSTAB}
  done
  [ -z "$usr_bin" ] &&
    echo "${CYGROOT//\\//}/bin /usr/bin ${FS_TYPE} binary 0 0" >> ${FSTAB}
  [ -z "$usr_lib" ] &&
    echo "${CYGROOT//\\//}/lib /usr/lib ${FS_TYPE} binary 0 0" >> ${FSTAB}

  cygd=""
  prefix=$(regtool -q get "$key\cygdrive prefix")
  flags=$(regtool -q get "$key\cygdrive flags")
  [ -z "$flags" ] && flags=2
  # Don't take system and cygdrive flags into account when testing
  if [ -n "$prefix" \
       -a \( "$prefix" != "/cygdrive" -o "$(( $flags & ~0x28 ))" -ne 2 \) ]
  then
    cygd="1"
    psx="${prefix// /\\040}"
    echo -n "none ${psx} cygdrive "
    print_flags $flags
    echo ",user 0 0"
  fi >> ${FSTAB}

  if [ -z "$cygd" ]
  then
    echo "# This is default anyway:" >> ${FSTAB}
    echo "# none /cygdrive cygdrive binary,user 0 0" >> ${FSTAB}
  fi
  IFS="$_OLD_IFS"
fi

# Check for ${FSTABDIR} directory

if [ -e "${FSTABDIR}" -a ! -d "${FSTABDIR}" ]
then 
  # No mercy.  Try to remove.
  rm -f "${FSTABDIR}"
  if [ -e "${FSTABDIR}" -a ! -d "${FSTABDIR}" ]
  then 
    echo
    echo "${FSTABDIR} is existant but not a directory."
    echo "Please fix that manually."
    echo
    exit 1
  fi
fi

# Create it if necessary

if [ ! -e "${FSTABDIR}" ]
then
  mkdir -m 1777 "${FSTABDIR}"
  if [ ! -e "${FSTABDIR}" ]
  then
    echo
    echo "Creating ${FSTABDIR} directory failed."
    echo "Please fix that manually."
    echo
    exit 1
  fi
fi

# Check for ${DEVDIR} directory

if [ -e "${DEVDIR}" -a ! -d "${DEVDIR}" ]
then 
  # No mercy.  Try to remove.
  rm -f "${DEVDIR}"
  if [ -e "${DEVDIR}" -a ! -d "${DEVDIR}" ]
  then 
    echo
    echo "${DEVDIR} is existant but not a directory."
    echo "Please fix that manually, otherwise you WILL get problems."
    echo
    exit 1
  fi
fi

# Create it if necessary

if [ ! -e "${DEVDIR}" ]
then
  mkdir -m 755 "${DEVDIR}"
  if [ ! -e "${DEVDIR}" ]
  then
    echo
    echo "Creating ${DEVDIR} directory failed."
    echo "Please fix that manually, otherwise you WILL get problems."
    echo
    exit 1
  fi
fi

setfacl -m u:system:rwx "${DEVDIR}"

# Check for ${DEVDIR}/shm directory (for POSIX semaphores and POSIX shared mem)

if [ -e "${DEVDIR}/shm" -a ! -d "${DEVDIR}/shm" ]
then
  # No mercy.  Try to remove.
  rm -f "${DEVDIR}/shm"
  if [ -e "${DEVDIR}/shm" -a ! -d "${DEVDIR}/shm" ]
  then 
    echo
    echo "${DEVDIR}/shm is existant but not a directory."
    echo "POSIX semaphores and POSIX shared memory will not work"
    echo
  fi
fi

# Create it if necessary

if [ ! -e "${DEVDIR}/shm" ]
then
  mkdir -m 1777 "${DEVDIR}/shm"
  if [ ! -e "${DEVDIR}/shm" ]
  then
    echo
    echo "Creating ${DEVDIR}/shm directory failed."
    echo "POSIX semaphores and POSIX shared memory will not work"
    echo
  fi
fi

# Check for ${DEVDIR}/mqueue directory (for POSIX message queues)

if [ -e "${DEVDIR}/mqueue" -a ! -d "${DEVDIR}/mqueue" ]
then
  # No mercy.  Try to remove.
  rm -f "${DEVDIR}/shm"
  if [ -e "${DEVDIR}/shm" -a ! -d "${DEVDIR}/shm" ]
  then 
    echo
    echo "${DEVDIR}/mqueue is existant but not a directory."
    echo "POSIX message queues will not work"
    echo
  fi
fi

# Create it if necessary

if [ ! -e "${DEVDIR}/mqueue" ]
then
  mkdir -m 1777 "${DEVDIR}/mqueue"
  if [ ! -e "${DEVDIR}/mqueue" ]
  then
    echo
    echo "Creating ${DEVDIR}/mqueue directory failed."
    echo "POSIX message queues will not work"
    echo
  fi
fi