53 lines
1.2 KiB
Bash
Executable File
53 lines
1.2 KiB
Bash
Executable File
#!/bin/bash
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if [ ! -z "${2}" ]; then
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echo "Expected only one argument"
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exit 1
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elif [ -z "${1}" ]; then
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echo "No file path provided"
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exit 1
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elif [ "$EUID" -eq 0 ]; then
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echo "Cannot be run as root"
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exit 1
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fi
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set -Eeuo pipefail
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destfile_pfx="$(cat /dev/urandom | tr -cd 'a-f0-9' | head -c 32)" || true
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while [ -d "/tmp/doasedit/$destfile_pfx" ]; do
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destfile_pfx="$(cat /dev/urandom | tr -cd 'a-f0-9' | head -c 32)"
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done
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tempdir="/tmp/doasedit/$destfile_pfx"
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# we don't want any other users to be able to read what we're doing, so -m700
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mkdir -m700 -p $tempdir
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trap "rm -rf $tempdir" EXIT
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srcfile="$(doas realpath $1)"
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if doas [ -f "$srcfile" ]; then
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doas cp -a $srcfile $tempdir/file
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doas cp -a $tempdir/file $tempdir/edit
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# make sure that the file is editable by user
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doas chown $USER:$USER $tempdir/edit
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chmod 600 $tempdir/edit
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else
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# create file with "regular" system permissions (root:root 644)
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touch $tempdir/file
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doas chown root:root $tempdir/file
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fi
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$EDITOR $tempdir/edit
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cat $tempdir/edit | doas tee $tempdir/file 1>/dev/null
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if doas cmp -s "$tempdir/file" "$srcfile"; then
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echo "Skipping write; no changes."
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exit 0
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else
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doas mv -f $tempdir/file $srcfile
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exit 0
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fi
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