A dumb-simple mod installation bash script

[Psycho_zs]

Hi everyone!

Just wanted to share a script that might be useful for those who play KSP with mods on Linux without using CKAN.

It automates boring things like removing old files, copying over new files, setting permissions (matches GameData owner and group, handy for root-protected installs).

Takes files and dirs as arguments, nothing fancy.

Edit path on 8th line before use. Read report before answering "yes". Anything before positive answer is safe.

#!/bin/bash
# kspmodinstall
# dumb KSP mod installer by Psycho_zs
# run as:
# kspmodinstall stuff

# path to KSP GameData dir
KSPDATA="/path/to/your/KSP/GameData"

[ -z "$@" ] && { echo "No arguments given. Give me something to install!" >&2 ; exit 1 ; }
[ ! -d "$KSPDATA" ] && { echo "GameData dir \"$KSPDATA\" does not exist!" >&2 ; exit 1 ; }
[ ! -w "$KSPDATA" ] && { echo "GameData dir \"$KSPDATA\" is not writeable!" >&2 ; exit 1 ; }

# get owner and group of GameData
GD_OWNER="$(stat -c %U "$KSPDATA")"
GD_GROUP="$(stat -c %G "$KSPDATA")"

FAIL=0
# check existence of data to be installed
echo "Checking what you've given..."
for OBJECT in "$@"
do
    # canonicalize path to avoid bad stuff with relative locations
    OBJECT="$(readlink -f "$OBJECT")"

    if [ -e "$OBJECT" ]
    then
        if [ -e "${KSPDATA}/$(basename ${OBJECT})" ]
        then
            echo -e "Will remove old object:\n\t\"${KSPDATA}/$(basename ${OBJECT})\"\n"
        fi
        echo -e "Will copy \"$(basename ${OBJECT})\" to:\n\t\"${KSPDATA}/$(basename ${OBJECT})\"\n"
    else
        echo "\"$OBJECT\" does not exist!" >&2
        FAIL=1
    fi
done

[ "$FAIL" = "1" ] && { echo "Some objects you've given were not found. Aborting." >&2 ; exit 1 ; }

CONTINUE=0
until [ "$CONTINUE" = "1" ]
do
    echo -ne "Continue with installing?\n(y/n) > "
    read ANSWER

    if echo "$ANSWER" | grep -qi '^[[:space:]]*y[[:space:]]*$\|^[[:space:]]*yes[[:space:]]*$'
    then
        echo "Proceeding..."
        CONTINUE=1
    elif echo "$ANSWER" | grep -qi '^[[:space:]]*n[[:space:]]*$\|^[[:space:]]*no[[:space:]]*$'
    then
        echo "Aborting."
        exit 0
    else
        echo "Not sure what you've meant by \"$ANSWER\", try again!"
    fi
done

for OBJECT in "$@"
do
    # canonicalize path to avoid bad stuff with relative locations
    OBJECT="$(readlink -f "$OBJECT")"

    # remove
    if [ -e "${KSPDATA}/$(basename ${OBJECT})" ]
    then
        rm -r "${KSPDATA}/$(basename ${OBJECT})" && echo "Removed: \"${KSPDATA}/$(basename ${OBJECT})\"" || echo "Failed to remove \"${KSPDATA}/$(basename ${OBJECT})\"!" >&2
    fi

    # copy
    cp -r --preserve=mode,timestamps "$OBJECT" -t "${KSPDATA}" && echo -e "Copied \"$(basename ${OBJECT})\" to:\n\t\"${KSPDATA}/$(basename ${OBJECT})\"" || echo "Failed to copy \"$(basename ${OBJECT})\"!" >&2
    # set GameData ownership to newly copied files
    chown -R "$GD_OWNER":"$GD_GROUP" "${KSPDATA}/$(basename ${OBJECT})"  || echo "Failed to set ownership \"${GD_OWNER}:${GD_GROUP}\" on \"${KSPDATA}/$(basename ${OBJECT})\"!" >&2
done