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scripts: add option to suppress read failures for termux-backup #3

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Merged
merged 3 commits into from
Aug 7, 2022
Merged

scripts: add option to suppress read failures for termux-backup #3

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23576d5
scripts: add option to suppress read failures for termux-backup
Aug 7, 2022
bff189f
scripts: detect when termux-backup is writing data to console
Aug 7, 2022
effe7e5
scripts: add termux-backup option to allow overwrites
Aug 7, 2022
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89 changes: 66 additions & 23 deletions scripts/termux-backup.in
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Original file line number Diff line number Diff line change
Expand Up @@ -39,55 +39,98 @@ msg() {

show_usage() {
msg
msg "Usage: termux-backup [output file]"
msg "Usage: termux-backup [options] [output file]"
msg
msg "Script for backing up Termux installation directory, \$PREFIX."
msg "It WILL NOT backup your home directory."
msg
msg "Options:"
msg
msg " -h, --help Show this information."
msg " -f, --force Force write operations."
msg " --ignore-read-failure Suppress read permission denials."
msg
msg "Backup is performed as TAR archive. Compression is determined"
msg "by output file extension. If file name is '-', then tarball is"
msg "written to stdout and is uncompressed."
msg
}

if [ $# -lt 1 ]; then
msg
msg "[!] Output file path is not specified."
show_usage
if [ ! -d "$PREFIX" ]; then
msg "[!] $PREFIX: directory does not exist."
exit 1
fi

if [ $# -gt 1 ]; then
shift 1
if [ $# -lt 1 ]; then
msg
msg "[!] Got extra arguments: $*"
msg "[!] Not enough arguments."
show_usage
exit 1
fi

if [ ! -d "$PREFIX" ]; then
msg "[!] $PREFIX: directory does not exist."
exit 1
fi
BACKUP_FILE_PATH=
TAR_EXTRA_OPTS=
FORCE_WRITE=false
while (($# >= 1)); do
case "$1" in
--) shift 1; break;;
-\?|-h|--help|--usage)
show_usage
exit 0
;;
-f|--force)
FORCE_WRITE=true
;;
--ignore-read-failure)
TAR_EXTRA_OPTS="--ignore-failed-read --warning=no-failed-read"
;;
*)
if [ -z "$1" ]; then
msg
msg "[!] Backup file path should not be an empty string."
show_usage
exit 1
fi

case "$1" in
-\?|-h|--help|--usage) show_usage; exit 0;;
*) BACKUP_FILE_PATH=$1;;
esac
# Filter all previously unrecognized options except '-', which is
# a valid backup output specification.
if [[ $1 =~ ^-.+ ]]; then
msg
msg "[!] Unknown option passed: ${1}"
show_usage
exit 1
fi

if [ -z "$BACKUP_FILE_PATH" ]; then
BACKUP_FILE_PATH=$1
else
msg
msg "[!] Redundant backup file path specified: ${1}"
show_usage
exit 1
fi
;;
esac
shift 1
done

if [ "$BACKUP_FILE_PATH" != "-" ]; then
CAN_AUTOCOMPRESS=yes
if [ -e "$BACKUP_FILE_PATH" ]; then
TAR_EXTRA_OPTS="$TAR_EXTRA_OPTS --auto-compress"
if [ -e "$BACKUP_FILE_PATH" ] && ! $FORCE_WRITE; then
msg
msg "[!] Refusing to overwrite already existing file '$BACKUP_FILE_PATH'."
msg "[!] Refusing to overwrite existing file without --force option: '$BACKUP_FILE_PATH'."
msg
exit 1
fi
else
CAN_AUTOCOMPRESS=
if [ -t 1 ]; then
msg
msg "[!] Refusing to write archive data to console."
msg
exit 1
fi
fi

msg "Backing up installed packages..."
tar --warning=no-file-ignored -f "$BACKUP_FILE_PATH" \
-c ${CAN_AUTOCOMPRESS+--auto-compress} \
-C "@TERMUX_BASE_DIR@" ./usr
tar --warning=no-file-ignored $TAR_EXTRA_OPTS -c \
-f "$BACKUP_FILE_PATH" -C "@TERMUX_BASE_DIR@" ./usr