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install needed packages when run/build images are different #7

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4 changes: 3 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -20,8 +20,10 @@ The buildpack will do the following:

| Environment Variable | Description |
| -------------------- | ----------- |
| BP_APT_RUNIMAGE_PACKAGES | List of apt packages installed in run-image, if run-image is different from build-image (optional) |

There are no environment variable configuration options.
If set, the variable `BP_APT_RUNIMAGE_PACKAGES` allows to compare installed packages in the run-image and install from `Aptfile` the packages listed and only the needed dependencies.
You can list the packages already installed in the run-image with `apt list --installed 2>/dev/null | grep -v 'Listing...' | awk -F'/' '{print $1}' | sort`.

### Aptfile

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15 changes: 14 additions & 1 deletion bin/build
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Expand Up @@ -100,7 +100,20 @@ else
curl --silent --show-error --fail -L -z "$PACKAGE_FILE" -o "$PACKAGE_FILE" "$PACKAGE" 2>&1 | indent
else
topic "Fetching .debs for $PACKAGE"
apt-get $APT_OPTIONS -y $APT_FORCE_YES -d install --reinstall "$PACKAGE" | indent
if [[ -z $BP_APT_RUNIMAGE_PACKAGES ]]; then
apt-get $APT_OPTIONS -y $APT_FORCE_YES -d install --reinstall "$PACKAGE" | indent
else
local runtime_installed_packages=$(mktemp)
echo "${BP_APT_RUNIMAGE_PACKAGES}" | sed 's/,/\n/g' | sort >> $runtime_installed_packages
local package_dependencies=$(mktemp)
apt-cache $APT_OPTIONS depends --recurse --no-recommends --no-suggests --no-conflicts --no-breaks --no-replaces --no-enhances --no-pre-depends "${PACKAGE}" | grep "^\w" | sort >> $package_dependencies
local needed_packages=$(mktemp)
comm -23 $package_dependencies $runtime_installed_packages | tr '\n' ' ' >> $needed_packages
pushd $APT_CACHE_DIR/archives
apt-get $APT_OPTIONS download $(cat "${needed_packages}") | indent
popd > /dev/null
rm $runtime_installed_packages $package_dependencies $needed_packages
fi
fi
}

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