doasedit


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#!/bin/sh
# Copy an existing text file to a temporary location, then edit the file.
# Attempt to then transfer the temporary file back to the original location if
# the temprary file has been altered. Conclude with a little clean-up. Try to
# avoid deleting any changes.

if [ $# -lt 1 ]
then
   echo "usage: $0 text-file"
   exit 1
fi

if [ ! -f "$1" ]
then
   echo "File does not exist or is a special file/link."
   exit 2
fi

if [ -L "$1" ]
then
   echo "File is a symbolic link. Refusing to edit."
   exit 2
fi

if [ ! -r "$1" ]
then
   echo "This user is unable to read the specified file."
   exit 3
fi

temp_file=$(mktemp --tmpdir doasedit.XXXXXXXX)
if [ ! $? ]
then
   echo "Could not create temporary file."
   exit 4
fi

cp "$1" "$temp_file"
if [ ! $? ]
then
   echo "Unable to copy file $1"
   exit 5
fi

# Attempt to run editor on the file
${EDITOR:-ed} "$temp_file"
if [ ! $? ]
then
   echo "Could not run editor $EDITOR"
   echo "Please make sure the EDITOR variable is set."
   rm -f "$temp_file"
   exit 6
fi

# Check to see if the file has been changed.
cmp -s "$1" "$temp_file"
status=$?
if [ $status -eq 0 ]
then
   echo "File unchanged. Not writing back to original location."
   rm -f "$temp_file"
   exit 0
fi

# At this point the file has been changed. Make sure it still exists.
if [ -f "$temp_file" ]
then
    doas cp "$temp_file" "$1"
    cmp -s "$temp_file" "$1"
    status=$?
    # If file fails to copy, do not do clean-up
    while [ $status -ne 0 ]
    do
       echo "Copying file back to $1 failed. Press Ctrl-C to abort or Enter to try again."
       read abc
       doas cp "$temp_file" "$1"
       cmp -s "$temp_file" "$1"
       status=$?
    done
fi

# Clean up
rm -f "$temp_file"
exit 0