mirror of
https://github.com/slicer69/doas
synced 2024-10-04 15:10:15 +00:00
95 lines
2 KiB
Bash
Executable file
95 lines
2 KiB
Bash
Executable file
#!/bin/sh
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# Copy an existing text file to a temporary location. Then
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# Edit the file.
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# Attempt to then transfer the temporary file back to the original
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# location if the temprary file has been altered.
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# Conclude with a little clean-up.
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# Try to avoid deleting any changes.
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if [ $# -lt 1 ]
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then
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echo "usage: $0 text-file"
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exit 1
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fi
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if [ ! -f "$1" ]
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then
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echo "File does not exist or is a special file/link."
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exit 2
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fi
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if [ -L "$1" ]
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then
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echo "File is a symbolic link. Refusing to edit."
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exit 2
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fi
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if [ ! -r "$1" ]
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then
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echo "This user is unable to read the specified file."
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exit 3
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fi
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temp_file=$(mktemp --tmpdir doasedit.XXXXXXXX)
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if [ ! $? ]
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then
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echo "Could not create temporary file."
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exit 4
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fi
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cp "$1" "$temp_file"
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if [ ! $? ]
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then
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echo "Unable to copy file $1"
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exit 5
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fi
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# If $VISUAL fails, run $EDITOR.
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# $EDITOR should be a line editor functional without advanced terminal features.
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# $VISUAL is a more advanced editor such as vi.
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"${VISUAL:-vi}" "$temp_file"
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if [ ! $? ]
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then
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"${EDITOR:-ex}" "$temp_file"
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if [ ! $? ]
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then
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echo "Could not run visual editor $VISUAL"
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echo "Could not run editor $EDITOR"
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echo "Please make sure the VISUAL and/or EDITOR variables are set."
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rm -f "$temp_file"
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exit 6
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fi
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fi
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# Check to see if the file has been changed.
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cmp -s "$1" "$temp_file"
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status=$?
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if [ $status -eq 0 ]
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then
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echo "File unchanged. Not writing back to original location."
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rm -f "$temp_file"
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exit 0
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fi
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# At this point the file has been changed. Make sure it still exists.
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if [ -f "$temp_file" ]
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then
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doas cp "$temp_file" "$1"
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cmp -s "$temp_file" "$1"
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status=$?
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# If file fails to copy, do not do clean-up
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while [ $status -ne 0 ]
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do
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echo "Copying file back to $1 failed. Press Ctrl-C to abort or Enter to try again."
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read abc
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doas cp "$temp_file" "$1"
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cmp -s "$temp_file" "$1"
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status=$?
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done
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fi
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# Clean up
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rm -f "$temp_file"
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exit 0
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