78 lines
1.5 KiB
Bash
78 lines
1.5 KiB
Bash
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#!/bin/sh
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set -eu
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if [ "$#" -lt 2 ] || [ "$#" -gt 3 ]; then
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echo "usage: $0 <source> <destination> [metadata-source]" >&2
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exit 64
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fi
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src="$1"
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dst="$2"
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metadata_source=${3:-}
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dst_dir=$(dirname "$dst")
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dst_name=$(basename "$dst")
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dst_ext=""
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case "$dst_name" in
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*.*)
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dst_ext=${dst_name##*.}
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;;
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esac
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test -f "$src" || {
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echo "source file not found: $src" >&2
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exit 66
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}
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owner=""
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group=""
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mode=""
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sample=""
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if [ -e "$dst" ]; then
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owner=$(stat -f '%Su' "$dst")
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group=$(stat -f '%Sg' "$dst")
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mode=$(stat -f '%Lp' "$dst")
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else
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if [ -n "$metadata_source" ]; then
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test -e "$metadata_source" || {
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echo "metadata source not found: $metadata_source" >&2
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exit 66
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}
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sample=$metadata_source
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elif [ -n "$dst_ext" ]; then
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for candidate in "$dst_dir"/*."$dst_ext"; do
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[ -e "$candidate" ] || continue
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sample=$candidate
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break
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done
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fi
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if [ -z "$sample" ]; then
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for candidate in "$dst_dir"/*; do
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[ -f "$candidate" ] || continue
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sample=$candidate
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break
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done
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fi
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if [ -n "$sample" ]; then
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owner=$(stat -f '%Su' "$sample")
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group=$(stat -f '%Sg' "$sample")
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mode=$(stat -f '%Lp' "$sample")
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else
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owner=$(stat -f '%Su' "$dst_dir")
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group=$(stat -f '%Sg' "$dst_dir")
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mode=644
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fi
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fi
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cp "$src" "$dst"
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chown "$owner":"$group" "$dst"
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chmod "$mode" "$dst"
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printf 'copied %s -> %s\n' "$src" "$dst"
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printf 'restored owner=%s group=%s mode=%s\n' "$owner" "$group" "$mode"
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if [ -n "$sample" ]; then
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printf 'metadata source=%s\n' "$sample"
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fi
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