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94 lines
3.4 KiB
94 lines
3.4 KiB
#!/bin/bash
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# This tool packages the current project as a tarball.
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#
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# The specification of the tarball is:
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# - metadata.json: the project's metadata (name, dependencies, file list, unit names, etc.)
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# - content.tar: the files to be installed on the target system, with their relative paths and permissions preserved.
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#
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# The tool takes its parameters from the environment variables defined in the Makefile:
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#
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# - PROJECT_NAME: the name of the project.
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# - ALL_DEPS: the list of all (direct and transitive) dependencies of the project.
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# - TARGET_CHROOT: the target chroot directory containing the files to be included in the tarball.
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# - BUTANE_BLOCKLIST: the path to a file containing a list of files and directories (one per line) to ignore
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# (i.e., files and directories that are already part of the CoreOS default installation
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# or belonging to another package).
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# - SYSTEMD_MAIN_UNIT_NAMES: the list of systemd main unit names to enable.
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#
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# The path to of the output tarball is $1.
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#
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set -Eeuo pipefail
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# Create a temporary directory to store intermediate files (metadata.json and content.tar)
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tmp_dir=$(mktemp -d)
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trap 'rm -rf "$tmp_dir"' EXIT
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# Generate the file list from the TARGET_CHROOT, excluding files and directories in the BUTANE_BLOCKLIST
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declare -a files_to_include=()
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filelist_file="$tmp_dir/filelist.txt"
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for path in $(find "$TARGET_CHROOT"); do
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rel_path="${path#$TARGET_CHROOT}"
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# Skip files & directories that are already part of the CoreOS default installation
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if grep -qxF "$rel_path" "$BUTANE_BLOCKLIST"; then
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continue
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fi
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# Skip the root directory and empty paths
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if [ -z "$rel_path" ] || [[ "$rel_path" == "/" ]]; then
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continue
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fi
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# The leading / is removed from the relative path in order for tar to find the file.
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echo "${rel_path#/}" >> "$filelist_file"
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# Although, the absolute path is stored in the metadata file.
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files_to_include+=("$rel_path")
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done
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# Generate metadata.json
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metadata_file="$tmp_dir/metadata.yaml"
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cat <<EOF > "$metadata_file"
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name: $PROJECT_NAME
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EOF
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if [ -n "${ALL_DEPS}" ]; then
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echo "dependencies:" >> "$metadata_file"
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for dep in ${ALL_DEPS};
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do echo "- $dep"
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done >> "$metadata_file"
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else
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echo "dependencies: []" >> "$metadata_file"
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fi
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if [ "${#files_to_include[@]}" -gt 0 ]; then
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echo "files:" >> "$metadata_file"
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for file in "${files_to_include[@]}"; do
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echo "- $file"
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done >> "$metadata_file"
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else
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echo "files: []" >> "$metadata_file"
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fi
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if [ -n "${SYSTEMD_MAIN_UNIT_NAMES}" ]; then
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echo "systemd_main_units:" >> "$metadata_file"
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for unit in ${SYSTEMD_MAIN_UNIT_NAMES}; do
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echo "- $unit"
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done >> "$metadata_file"
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else
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echo "systemd_main_units: []" >> "$metadata_file"
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fi
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# Convert metadata.yaml to metadata.json
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yq -o json "$metadata_file" > "$tmp_dir/metadata.json"
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# Common tar options to ensure that the tarball is reproducible and does not contain unnecessary metadata
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declare -a tar_options=(
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"--no-selinux"
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"--no-recursion"
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"--no-xattrs"
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"--no-acls"
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)
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# Generate content.tar with the files to be included in the tarball, preserving their relative paths and permissions.
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tar -cf "$tmp_dir/content.tar" "${tar_options[@]}" -C "$TARGET_CHROOT" --verbatim-files-from --files-from="$filelist_file"
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# Generate the final tarball.
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tar -czf "$1" "${tar_options[@]}" -C "$tmp_dir" --owner=0 --group=0 metadata.json content.tar
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