#!/bin/bash
name="mktar"
version="1.1"
read -r -d '' help_message <<-EOF
Wrapper around 'tar' for easier compression
Usage: mktar FILES [..] [OPTIONS]
Options:
-c, --compress compress archive with gzip
--compress=ALGO compress archive with [none|gzip|xz|zstd|bzip2]
-C, --checksum create checksum with SHA1
-e, --encrypt encrypt files with GPG
-h, --help print this message
-n FILE, --name FILE name of backup file (Default: archive.tar)
-q, --quiet suppress error messages and prompts
-v, --verbose show additional messages
-V, --version print version number and exit
EOF
source /usr/local/lib/mylib.bash
positional=()
quiet=0
verbose=0
compress=-1
encrypt=-1
checksum=-1
archive_fn=""
while [[ $# -gt 0 ]]; do
case $1 in
--compress=xz|--compress=2)
debug_msg "Setting compress option to 2 (=xz) (was ${compress})"
compress=2
shift
;;
--compress=zst|--compress=zstd|--compress=3)
debug_msg "Setting compress option to 3 (=zstd) (was ${compress})"
compress=3
shift
;;
--compress=bz2|--compress=bzip2|--compress=4)
debug_msg "Setting compress option to 4 (=bzip2) (was ${compress})"
compress=4
shift
;;
--compress=gz|--compress=gzip|--compress=1)
debug_msg "Setting compress option to 1 (=gzip) (was ${compress})"
compress=1
shift
;;
--compress=no|--compress=none|--compress=0)
debug_msg "Setting compress option to 0 (=none) (was ${compress})"
compress=0
shift
;;
--compress=*)
attempted_compression="$(printf "%s\n" "$1" | sed -e 's/^.*=//' )"
error_msg "Unknown compression '${attempted_compression}'"
;;
-c|--compress)
debug_msg "Setting compress option to 1 (=gzip) (was ${compress})"
compress=1
shift
;;
-C|--checksum)
debug_msg "Setting checksum option to 1 (=SHA1) (was ${checksum})"
checksum=1
shift
;;
-e|--encrypt)
debug_msg "Setting encrypt option to 1 (=GPG) (was ${encrypt})"
encrypt=1
shift
;;
-h|--help)
help_msg
shift
;;
-n|--name)
debug_msg "Setting output filename to ${2} (was ${archive_fn})"
archive_fn="$2"
shift; shift
;;
-q|--quiet)
debug_msg "Setting quiet option to 1 (was ${quiet})"
quiet=1
shift
;;
-v|--verbose)
debug_msg "Setting verbose option to 1 (was ${verbose})"
verbose=1;
shift
;;
-V|--version)
version_msg
;;
*)
debug_msg "Argument '${1}' added to positional array"
positional+=("$1")
shift
;;
esac
done
# error if no filenames given
if [[ "${#positional[@]}" -lt 1 ]]; then
debug_msg "No input filenames were given"
usage_msg
fi
# determine tar action
if [[ "$compress" -eq 1 ]]; then
archive_action="tar.gz"
elif [[ "$compress" -eq 2 ]]; then
archive_action="tar.xz"
elif [[ "$compress" -eq 3 ]]; then
archive_action="tar.zst"
elif [[ "$compress" -eq 4 ]]; then
archive_action="tar.bz2"
elif [[ -n "$archive_fn" && "$compress" -eq -1 ]]; then
case "$archive_fn" in
*.tar)
archive_action="tar"
;;
*.tar.gz)
archive_action="tar.gz"
;;
*.tar.xz)
archive_action="tar.xz"
;;
*.tar.zst)
archive_action="tar.zst"
;;
*.tar.bz2)
archive_action="tar.bz2"
;;
esac
else
archive_action="tar"
fi
if [[ "$encrypt" -eq 1 ]]; then
archive_action="${archive_action}.gpg"
elif [[ -n "$archive_fn" && "$encrypt" -eq -1 ]]; then
case "$archive_fn" in
*.gpg)
archive_action="${archive_action}.gpg"
;;
esac
fi
# output filename
if [[ -z "$archive_fn" ]]; then
archive_fn="archive.${archive_action}"
checksum_fn="archive.sha1"
debug_msg "No output filename was given, defaulting to '${archive_fn}'"
else
checksum_fn="$(fn_basename "$archive_fn").sha1"
fi
# check files
if contains "$archive_fn" "${positional[@]}"; then
error_msg "Output file cannot also be input file"
elif [[ "$checksum" -eq 1 ]] && contains "$checksum_fn" "${positional[@]}"; then
error_msg "Output file cannot also be input file"
fi
if ! prompt_overwrite "$archive_fn"; then
exit 1
elif [[ "$checksum" -eq 1 ]] && ! prompt_overwrite "$checksum_fn"; then
exit 1
fi
for target in "${positional[@]}";do
if [[ ! -f "$target" ]] && [[ ! -d "$target" ]]; then
error_msg "No such file '${target}'"
fi
done
# main routine
code=0
case "$archive_action" in
tar)
if ! /usr/bin/tar -cf "$archive_fn" "${positional[@]}"; then
code=1
fi
;;
tar.gpg)
if ! /usr/bin/tar -c "${positional[@]}" | /usr/bin/gpg -c -o "$archive_fn"; then
code=1
fi
;;
tar.gz)
if ! /usr/bin/tar -czf "$archive_fn" "${positional[@]}"; then
code=1
fi
;;
tar.gz.gpg)
if ! /usr/bin/tar -cz "${positional[@]}" | /usr/bin/gpg -c -o "$archive_fn"; then
code=1
fi
;;
tar.xz)
if ! /usr/bin/tar -cJf "$archive_fn" "${positional[@]}"; then
code=1
fi
;;
tar.xz.gpg)
if ! /usr/bin/tar -cJ "${positional[@]}" | /usr/bin/gpg -c -o "$archive_fn"; then
code=1
fi
;;
tar.zst)
if ! /usr/bin/tar --zstd -cf "$archive_fn" "${positional[@]}"; then
code=1
fi
;;
tar.zst.gpg)
if ! /usr/bin/tar --zstd -c "${positional[@]}" | /usr/bin/gpg -c -o "$archive_fn"; then
code=1
fi
;;
tar.bz2)
if ! /usr/bin/tar -cjf "$archive_fn" "${positional[@]}"; then
code=1
fi
;;
tar.bz2.gpg)
if ! /usr/bin/tar -cj "${positional[@]}" | /usr/bin/gpg -c -o "$archive_fn"; then
code=1
fi
;;
esac
# checksum routine
if [[ "$checksum" -eq 1 ]]; then
if ! /usr/bin/sha1sum "$archive_fn" | /usr/bin/awk '{print $1}' > "$checksum_fn"; then
code=1
fi
fi
# return stored code
exit "$code"