genpkg.sh

#!/bin/bash

# Exit immediately on first error
set -e

#
# Script parameters
#
###################

# Boost libraries
BOOST_LIBS="filesystem system iostreams locale program-options thread"

# We are generating symlinks that point this version of the library:
UPSTREAM_OLD_VERS="1.67.0"

# ... to this newer version:
UPSTREAM_NEW_VERS="1.74.0"

# Revision of the generated bedian packages
DEBIAN_REVISION="1"

# Directory where we store all files generated by this script; ignored by git
TARGET="target"

# Save all generated .deb packages in this directory
PKGDIR="libboost${UPSTREAM_OLD_VERS}-debian11-${UPSTREAM_OLD_VERS}-${DEBIAN_REVISION}"

#
# Script execution
#
###################

rm -rf "${TARGET}"
mkdir -p "${TARGET}/${PKGDIR}"
for L in ${BOOST_LIBS}
do
    LL=$(echo "${L}" | tr "-" "_")
    OLD_PKG_NAME="libboost-${L}${UPSTREAM_OLD_VERS}"
    OLD_PKG_FULL_NAME="${OLD_PKG_NAME}-${UPSTREAM_OLD_VERS}-${DEBIAN_REVISION}"
    OLD_LIB_NAME="libboost_${LL}.so.${UPSTREAM_OLD_VERS}"
    NEW_PKG_NAME="libboost-${L}${UPSTREAM_NEW_VERS}"
    NEW_LIB_NAME="libboost_${LL}.so.${UPSTREAM_NEW_VERS}"
    mkdir -p "${TARGET}/${OLD_PKG_FULL_NAME}/DEBIAN"
    cat > "${TARGET}/${OLD_PKG_FULL_NAME}/DEBIAN/control" << EOF
Section: misc
Priority: optional
Standards-Version: 3.9.2
Package: ${OLD_PKG_NAME}
Version: ${UPSTREAM_OLD_VERS}-${DEBIAN_REVISION}
Architecture: all
Maintainer: Dario Nicodemi
Depends: ${NEW_PKG_NAME} (>= ${UPSTREAM_NEW_VERS})
Description: compat symlink ${UPSTREAM_OLD_VERS} -> ${UPSTREAM_NEW_VERS}
EOF
    cat > "${TARGET}/${OLD_PKG_FULL_NAME}/DEBIAN/postinst" << EOF
#!/bin/sh
(cd "/lib/\$(dpkg-architecture -qDEB_HOST_MULTIARCH)" && ln -sf "${NEW_LIB_NAME}" "${OLD_LIB_NAME}")
EOF
    chmod 0755 "${TARGET}/${OLD_PKG_FULL_NAME}/DEBIAN/postinst"
    cat > "${TARGET}/${OLD_PKG_FULL_NAME}/DEBIAN/prerm" << EOF
#!/bin/sh
(cd "/lib/\$(dpkg-architecture -qDEB_HOST_MULTIARCH)" && rm "${OLD_LIB_NAME}")
EOF
    chmod 0755 "${TARGET}/${OLD_PKG_FULL_NAME}/DEBIAN/prerm"
    dpkg-deb --build "${TARGET}/${OLD_PKG_FULL_NAME}" "${TARGET}/${PKGDIR}"
done

(
    cd ${TARGET}
    tar czvf "${PKGDIR}.tar.gz" "${PKGDIR}"
)