mkgcdatar

#!/bin/bash
# vim: set ts=4 sw=4 st=4 expandtab :


move_to_bak() {
    
    LOCATION="${1}"
    if [[ -e "${LOCATION}" ]];
    then
        printf "  Backing up %s to %s.bak...\n" "${LOCATION}" "${LOCATION}"
        mv -f "${LOCATION}" "${LOCATION}.bak"
        RET=$?
        if [ ${RET} -ne 0 ];
        then
            printf "\t\tError trying to move \"%s\" over \"%s.bak\" (got error code %d)\n\n" "${LOCATION}" "${LOCATION}" "${RET}" >&2
            return ${RET};
        fi
    fi

    return 0;
}

echoerr() {
    echo "$@" >&2
}

printferr() {
    printf "$@" >&2
}


PKGBUILD_DIR=
THIS_DIR="$(realpath "$(pwd)")"
cd "${THIS_DIR}"
pushd . >/dev/null 2>&1

BACK_PATH=
FOUND_IT='false'

#DIRS_TO_HARDLINK='./ '
DIRS_TO_HARDLINK=''

while [[ "${THIS_DIR}" != "/" ]];
do
    # Back path - add a parent directory marker
    BACK_PATH="${BACK_PATH}../"

    # Add current directory represented in backpaths to hardlink dir list
    DIRS_TO_HARDLINK="${DIRS_TO_HARDLINK} ${BACK_PATH}" 
    cd ..
    THIS_DIR="$(realpath "$(pwd)")"

    if [ -f "PKGBUILD" ];
    then
        printf "We found the source dir containing PKGBUILD as: %s\n\n" "${THIS_DIR}"
        PKGBUILD_DIR="${THIS_DIR}"
        FOUND_IT='true'
        break
    fi
done

# Return to origin dir
popd >/dev/null 2>&1

# Make sure we matched it
if [[ "${FOUND_IT}" = "false" ]];
then
    echoerr "Could not find PKGBUILD in any parent directories of $(pwd)"
    exit 1;
fi

# Strip out leading ' '
DIRS_TO_HARDLINK="${DIRS_TO_HARDLINK:1:$(echo "${DIRS_TO_HARDLINK}" | wc -c)}"

move_to_bak 'gcda.tar'
RET=$?
if [ ${RET} -ne 0 ];
then
    echoerr 'Failed to move gcda.tar to gcda.tar.bak....'
    exit ${RET}
fi

# Create fresh gcda.tar with all gcda files in this and all subdirs
tar -cf 'gcda.tar' $(find . -type f -name '*.gcda')
RET=$?

# Make sure we successfully created the tar
if [ ${RET} -ne 0 ];
then
    printferr "Failed to create gcda.tar in current directory. Exit code: [%d]\n" "${RET}"
    exit 2;
fi

printf "\nCreated gcda.tar\n\n"


GCDA_TAR_PATH="$(realpath 'gcda.tar')"
RET=$?
if [ ${RET} -ne 0 ] || [ -z "${GCDA_TAR_PATH}" ];
then
    echoerr "Failed to resolve realpath to `pwd`/gcda.tar. Error code ${RET}\n\n"
    exit 1

elif [ ! -e "${GCDA_TAR_PATH}" ];
then
    echoerr "Failed to find gcda.tar we created at \"${GCDA_TAR_PATH}\"\n\n"
    exit 1
fi

# Iterate over all dirs back to and including PKGBUILD dir, to make
#   backups of previous gcda.tar and fresh hardlink
for dirName in ${DIRS_TO_HARDLINK};
do
    # NOTE: #dirName contains trailing slash
    fname="$(printf "%s%s" "${dirName}" 'gcda.tar')"

    # Make backup if exists
    move_to_bak "${fname}"
    RET=$?

    if [ ${RET} -ne 0 ];
    then
        echoerr "WARNING: Failed to move \"${fname}\" to \"${fname}.bak\", skipping link creation there.";
        continue
    fi

    ln gcda.tar "$(realpath "${dirName}gcda.tar")" || echoerr "Failed to create hardlink at \"${dirName}gcda.tar\" pointing to `pwd`/gcda.tar"
    RET=$?

    if [ ${RET} -eq 0 ];
    then
        printf "    Successfully made hardlink from \"%sgcda.tar\" to \"%s/gcda.tar\"\n\n" "${dirName}" "$(pwd)";
    else
        printf "    FAILED to create hardlink from \"%sgcda.tar\" to \"%s/gcda.tar\" - got error code %d\n\n" "${dirName}" "$(pwd)" "${RET}" >&2
    fi

done


# vim: set ts=4 sw=4 st=4 expandtab :