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|
#! /bin/bash
# Recognizes tar archive extraction using the options listed below. Any other
# operations or options will cause the tar command to be executed directly,
# with no special processing.
declare -r short_opts=ajJvxzZ
declare -r short_opts_arg=CfI
declare -r -A long_opts=(
[--auto-compress]=1 [--bzip2]=1 [--compress]=1 [--extract]=1 [--file]=1
[--get]=1 [--gunzip]=1 [--gzip]=1 [--lzip]=1 [--lzma]=1 [--lzop]=1
[--no-auto-compress]=1 [--uncompress]=1 [--ungzip]=1 [--verbose]=1
[--xz]=1 [--zstd]=1
)
declare -r -A long_opts_arg=(
[--use-compress-program]=1
)
command=${0##*/}
original_args=("$@")
args=()
opt_extract=
opt_directory=
opt_file=
PATH=${PATH#*:}
traditional_to_unix() {
local opts=$1 args=()
shift
[[ "$opts" =~ ^[Acdrtux] ]] || return
while [ -n "$opts" ]; do
args+=("-${opts:0:1}")
if [[ "$opts" =~ ^[$short_opts_arg] ]]; then
[ $# -ge 1 ] || return 1
args+=("$1")
shift
else
[[ "$opts" =~ ^[$short_opts] ]] || return
fi
opts="${opts:1}"
done
printf "%q " "${args[@]}" "$@"
}
debug() {
echo "$@">&2
}
fallback() {
debug "falling back to $command"
exec "$command" "${original_args[@]}"
}
[ $# -gt 0 ] || fallback
if ! [[ "$1" =~ ^- ]]; then
args=$(traditional_to_unix "$@") || fallback
set -- $args
fi
set_opt_file() {
[ -n "$1" ] || fallback
opt_file=$1
}
set_opt_directory() {
[ -n "$1" ] || fallback
opt_directory=$1
}
short_opt() {
debug option "$1"
case "$1" in
-x)
opt_extract=1
;;
esac
args+=("$1")
}
short_opt_arg() {
debug option "$1" "$2"
case "$1" in
-C)
set_opt_directory "$2"
;;
-f)
set_opt_file "$2"
;;
*)
args+=("$1$2")
;;
esac
}
long_opt() {
debug option "$1" "$2"
case "$1" in
--extract|--get)
opt_extract=1
;;
esac
args+=("$1")
}
long_opt_arg() {
debug option "$1" "$2"
case "$1" in
--directory)
set_opt_directory "$2"
;;
--file)
set_opt_file "$2"
;;
*)
args+=("$1=$2")
;;
esac
}
while [ $# -gt 0 ]; do
if [[ "$1" =~ ^-- ]]; then
[ "$1" != -- ] || break
if [[ "$1" =~ ^(--.*)=(.*) ]]; then
[ -n "${long_opts_arg[${BASH_REMATCH[1]}]}" ] || fallback
long_opt_arg "${BASH_REMATCH[1]}" "${BASH_REMATCH[2]}"
shift
elif [ -n "${long_opts_arg[$1]}" ]; then
[ $# -ge 2 ] || fallback
long_opt_arg "$1" "$2"
shift 2
elif [ -n "${long_opts[$1]}" ]; then
long_opt "$1"
shift
else
fallback
fi
elif [[ "$1" =~ ^- ]]; then
[ "$1" != - ] || break
if [[ "$1" =~ ^(-[$short_opts])(.*) ]]; then
short_opt "${BASH_REMATCH[1]}"
shift
if [ -n "${BASH_REMATCH[2]}" ]; then
set -- "-${BASH_REMATCH[2]}" "$@"
fi
elif [[ "$1" =~ ^(-[$short_opts_arg])(.*) ]]; then
if [ -z "${BASH_REMATCH[2]}" ]; then
[ $# -ge 2 ] || fallback
short_opt_arg "${BASH_REMATCH[1]}" "$2"
shift 2
else
short_opt_arg "${BASH_REMATCH[1]}" "${BASH_REMATCH[2]}"
shift
fi
else
fallback
fi
else
break
fi
done
[ -n "$opt_extract" ] || fallback
! [[ "/${opt_directory:-.}/" =~ /\.\./|^// ]] || fallback
mkpath() {
if [ "$1" == . ]; then
echo "$2"
elif [ "$2" == . ]; then
echo "$1"
else
echo "$1/$2"
fi
}
if [ -n "$QUILT_WORKDIR" ]; then
cleanup() {
rm -rf "$tmpdir"
}
dir=${opt_directory:-.}
pattern=$(mkpath "$dir" ".$command.XXXXXX")
tmpdir=$(mktemp -d "$pattern" 2> /dev/null) || fallback
trap cleanup EXIT
opt_directory=$tmpdir
fi
[ -z "$opt_directory" ] || args+=("-C$opt_directory")
[ -z "$opt_file" ] || args+=("-f$opt_file")
args+=("$@")
"$command" "${args[@]}" || exit
if [ -n "$QUILT_WORKDIR" ]; then
workdir=$(mkpath "$QUILT_WORKDIR" "$dir")
shopt -s dotglob
files=( "$opt_directory"/* )
for file in "${files[@]##*/}"; do
if [ -e "$(mkpath "$dir" "$file")" -o \
-e "$(mkpath "$workdir" "$file")" ]; then
printf $"Refusing to overwrite %s\n" \
"$(mkpath "$dir" "$file")"
exit 1
fi
done
mkdir -p "$workdir" || exit
cp -dlR "${files[@]}" "$workdir/" || exit
mv "${files[@]}" "$dir/" || exit
fi
|
