Self-extracting RPM installer

selfinstaller.bzx

#!/bin/sh
# A self-extracting installer for RPMs
#
# Requires: POSIX env, base64, and mktemp.
#
# To create: make a gzip-compressed tarball of RPMs (with no subdirectory),
# convert to base64, then concatenate onto the end of this file::
#
#   cd /some/directory/of/rpm/files
#   tar -cz *.rpm | base64 -w0 >> selfinstaller.bzx

main() {
    printf '\nSelf Extracting Installer\n'

    local TMPDIR=$(mktemp -d /tmp/selfextract.XXXXXX)

    trap 'rm -rf '"$TMPDIR" SIGINT SIGTERM EXIT

    local ARCHIVE=$(awk '/^__ARCHIVE_BELOW__/ { print NR + 1; exit 0; }' $0)

    tail -n+"$ARCHIVE" "$0" | base64 -d | tar -C "$TMPDIR" -xz || \
        { printf 'Bad archive. Exiting.\n'; return 1; }

    yum localinstall --nogpgcheck -q -y "$TMPDIR"/*rpm

    return $?
}

main "$@"
exit $?

__ARCHIVE_BELOW__