mirror of
https://codeberg.org/kiss-community/kiss
synced 2024-11-19 21:10:07 -07:00
442 lines
14 KiB
Bash
Executable File
442 lines
14 KiB
Bash
Executable File
#!/bin/sh -e
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#
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# This is a simple package manager written in POSIX 'sh' for
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# KISS Linux utlizing the core unix utilites where needed.
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#
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# The script runs with 'set -e' enabled. It will exit on any
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# non-zero return code. This ensures that no function continues
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# if it fails at any point.
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#
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# Keep in mind that this involves extra code in the case where
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# an error is optional or required.
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#
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# Where possible the package manager should "error first".
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# Check things first, die is necessary and continue if all is well.
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#
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# The code below conforms to shellcheck's rules. However, some
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# lint errors *are* disabled as they relate to unexpected
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# behavior (which we do expect).
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#
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# KISS is available under the MIT license.
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#
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# - Dylan Araps.
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die() {
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# Print a message and exit with '1' (error).
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printf '\033[31m!>\033[m %s\n' "$@" >&2
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exit 1
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}
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log() {
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# Print a message with a colorful arrow to distinguish
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# from other output.
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printf '\033[32m=>\033[m %s\n' "$@"
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}
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pkg_lint() {
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# Check that each mandatory file in the package entry exists.
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log "[$1]: Checking repository files..."
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pkg_location=$(pkg_search "$1")
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cd "$pkg_location" || die "'$pkg_location' not accessible"
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[ -f sources ] || die "Sources file not found."
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[ -x build ] || die "Build file not found or not executable."
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[ -s licenses ] || die "License file not found or empty."
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[ -s version ] || die "Version file not found or empty."
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# Ensure that the release field in the version file is set
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# to something.
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read -r _ rel < version
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[ "$rel" ] || die "Release field not found in version file."
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# Unset this variable so it isn't used again on a failed
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# source. There's no 'local' keyword in POSIX sh.
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rel=
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}
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pkg_search() {
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# Figure out which repository a package belongs to by
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# searching for directories matching the package name
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# in $KISS_PATH/*.
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[ "$KISS_PATH" ] || \
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die "\$KISS_PATH needs to be set." \
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"Example: KISS_PATH=/packages/core:/packages/extra:/packages/xorg" \
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"Repositories will be searched in the configured order." \
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"The variable should work just like \$PATH."
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# Disable globbing with 'set -f' to ensure that the unquoted
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# variable doesn't expand into anything nasty.
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# shellcheck disable=2086,2046
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{
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set -f
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set -- "$1" $(IFS=:; find $KISS_PATH -maxdepth 1 -name "$1")
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set +f
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}
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# A package may also not be found due to a repository not being
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# readable by the current user. Either way, we need to die here.
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[ -z "$2" ] && die "Package '$1' not in any repository."
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printf '%s\n' "$2"
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}
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pkg_list() {
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# List installed packages. As the format is files and
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# diectories, this just involves a simple for loop and
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# file read.
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# Changing directories is similar to storing the full
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# full path in a variable, only there is no variable as
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# you can access children relatively.
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cd "$KISS_ROOT/var/db/kiss" || \
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die "KISS database doesn't exist or is inaccessible."
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# Optional arguments can be passed to check for specific
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# packages. If no arguments are passed, list all. As we
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# loop over '$@', if there aren't any arguments we can
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# just set the directory contents to the argument list.
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[ "$1" ] || set -- *
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# Loop over each version file and warn if one doesn't exist.
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# Also warn if a package is missing its version file.
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for pkg; do
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[ -d "$pkg" ] || {
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log "Package '$pkg' is not installed."
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return 1
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}
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[ -f "$pkg/version" ] || {
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log "Warning: Package '$pkg' has no version file."
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return
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}
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read -r version release < "$pkg/version" &&
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printf '%s\n' "${pkg%/*} $version-$release"
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done
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}
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pkg_sources() {
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# Download any remote package sources.
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log "[$1]: Downloading sources..."
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# Store each downloaded source in named after the package it
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# belongs to. This avoid conflicts between two packages having a
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# source of the same name.
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mkdir -p "$src_dir/$1" && cd "$src_dir/$1"
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# Find the package's repository files. This needs to keep
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# happening as we can't store this data in any kind of data
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# structure.
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repo_dir=$(pkg_search "$1")
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while read -r src _; do
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case $src in
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# Git repository.
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git:*)
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git clone "${src##git:}" "$mak_dir"
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;;
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# Remote source.
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*://*)
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[ -f "${src##*/}" ] && {
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log "[$1]: Found cached source '${src##*/}'."
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continue
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}
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wget "$src" || {
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rm -f "${src##*/}"
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die "[$1]: Failed to download $src."
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}
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;;
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# Local files (Any source that is non-remote is assumed to be local).
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*)
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[ -f "$repo_dir/$src" ] ||
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die "[$1]: No local file '$src'."
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log "[$1]: Found local file '$src'."
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;;
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esac
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done < "$repo_dir/sources"
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}
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pkg_depends() {
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# Resolve all dependencies and install them in the right order.
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# Find the package's repository files. This needs to keep
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# happening as we can't store this data in any kind of data
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# structure.
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repo_dir=$(pkg_search "$1")
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pkg_list "$1" >/dev/null || {
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case $missing_deps in
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# Dependency is already in list, skip it.
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*" $1 "*) ;;
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*)
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[ -f "$repo_dir/depends" ] &&
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while read -r dep _; do
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pkg_depends "$dep"
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done < "$repo_dir/depends"
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missing_deps="$missing_deps $1 "
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;;
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esac
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}
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}
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pkg_build() {
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# Build packages and turn them into packaged tarballs. This function
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# also checks checksums, downloads sources and ensure all dependencies
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# are installed.
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# Resolve dependencies and generate a list.
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log "Resolving dependencies..."
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for pkg; do pkg_depends "$pkg"; done
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# Disable globbing with 'set -f' to ensure that the unquoted
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# variable doesn't expand into anything nasty.
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# shellcheck disable=2086,2046
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{
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# Set the resolved dependency list as the function's arguments.
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set -f
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set -- $missing_deps
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set +f
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}
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log "Installing: $*."
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for pkg; do pkg_lint "$pkg"; done
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for pkg; do
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# Find the package's repository files. This needs to keep
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# happening as we can't store this data in any kind of data
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# structure.
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repo_dir=$(pkg_search "$pkg")
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# Ensure that checksums exist prior to building the package.
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[ -f "$repo_dir/checksums" ] || {
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log "[$pkg]: Checksums are missing."
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# Instead of dying above, log it to the terminal. Also define a
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# variable so we *can* die after all checksum files have been
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# checked.
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no_checkums="$no_checkums$pkg "
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}
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done
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# Die here as packages without checksums were found above.
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[ "$no_checkums" ] &&
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die "Run '$kiss checksum ${no_checkums% }' to generate checksums."
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for pkg; do pkg_sources "$pkg"; done
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for pkg; do
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# Find the package's repository files. This needs to keep
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# happening as we can't store this data in any kind of data
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# structure.
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repo_dir=$(pkg_search "$pkg")
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pkg_checksums "$pkg"
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cmp -s "$cac_dir/checksums-$pkg" "$repo_dir/checksums" || {
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log "[$pkg]: Checksum mismatch."
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# Instead of dying above, log it to the terminal. Also define a
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# variable so we *can* die after all checksum files have been
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# checked.
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mismatch="$mismatch$pkg "
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}
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done
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# Die here as packages with differing checksums were found above.
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[ "$mismatch" ] &&
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die "Checksum mismatch with: ${mismatch% }"
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}
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pkg_checksums() {
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# Generate checksums for packages.
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# This also downloads any remote sources.
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for pkg; do
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# Find the package's repository files. This needs to keep
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# happening as we can't store this data in any kind of data
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# structure.
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repo_dir=$(pkg_search "$pkg")
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while read -r src _; do
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case $src in
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# Git repository.
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# Skip checksums on git repositories.
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git:*) ;;
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*)
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# File is local to the package and is stored in the
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# repository.
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[ -f "$repo_dir/$src" ] &&
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src_path=$repo_dir/${src%/*}
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# File is remote and was downloaded.
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[ -f "$src_dir/$pkg/${src##*/}" ] &&
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src_path=$src_dir/$pkg
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# Die here if source for some reason, doesn't exist.
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[ "$src_path" ] ||
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die "[$pkg]: Couldn't find source '$src'."
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# An easy way to get 'sha256sum' to print with the basenames
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# of files is to 'cd' to the file's directory beforehand.
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(cd "$src_path" && sha256sum "${src##*/}") ||
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die "[$pkg]: Failed to generate checksums."
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# Unset this variable so it isn't used again on a failed
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# source. There's no 'local' keyword in POSIX sh.
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src_path=
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;;
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esac
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done < "$repo_dir/sources" | \
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tee "$cac_dir/checksums-$pkg" > "$repo_dir/checksums"
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log "[$pkg]: Generated checksums."
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done
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}
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setup_caching() {
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# Setup the host machine for the package manager. Create any
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# directories which need to exist and set variables for easy
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# access to them.
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# Main cache directory (~/.cache/kiss/) typically.
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mkdir -p "${cac_dir:=${XDG_CACHE_HOME:=$HOME/.cache}/$kiss}" ||
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die "Couldn't create cache directory ($cac_dir)."
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# Build directory.
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mkdir -p "${mak_dir:=$cac_dir/build-$pid}" ||
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die "Couldn't create build directory ($mak_dir)."
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# Package directory.
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mkdir -p "${pkg_dir:=$cac_dir/pkg-$pid}" ||
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die "Couldn't create package directory ($pkg_dir)."
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# Tar directory.
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mkdir -p "${tar_dir:=$cac_dir/extract-$pid}" ||
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die "Couldn't create tar directory ($tar_dir)."
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# Source directory.
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mkdir -p "${src_dir:=$cac_dir/sources}" ||
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die "Couldn't create source directory ($src_dir)."
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# Binary directory.
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mkdir -p "${bin_dir:=$cac_dir/bin}" ||
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die "Couldn't create binary directory ($bin_dir)."
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}
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pkg_clean() {
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# Clean up on exit or error. This removes everything related
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# to the build.
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# Remove temporary directories.
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rm -rf -- "$mak_dir" "$pkg_dir" "$tar_dir"
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# Remove temporary checksum files.
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rm -rf -- "$cac_dir/checksums-"*
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}
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root_check() {
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# Ensure that the user has write permissions to '$KISS_ROOT'.
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# When this variable is empty, a value of '/' is assumed.
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[ -w "$KISS_ROOT/" ] || \
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die "No write permissions to '${KISS_ROOT:-/}'." \
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"You may need to run '$kiss' as root."
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}
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args() {
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# Parse script arguments manually. POSIX 'sh' has no 'getopts'
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# or equivalent built in. This is rather easy to do in our case
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# since the first argument is always an "action" and the arguments
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# that follow are all package names.
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# Actions can be abbreviated to their first letter. This saves
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# keystrokes once you memorize themand it also has the side-effect
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# of "correcting" spelling mistakes assuming the first letter is
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# right.
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case $1 in
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# Build the list of packages.
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b*)
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shift
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[ "$1" ] || die "'kiss build' requires an argument."
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pkg_build "$@"
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;;
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# Generate checksums for packages.
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c*)
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shift
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[ "$1" ] || die "'kiss checksum' requires an argument."
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for pkg; do pkg_lint "$pkg"; done
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for pkg; do pkg_sources "$pkg"; done
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pkg_checksums "$@"
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;;
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# Install packages.
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i*)
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shift
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[ "$1" ] || die "'kiss install' requires an argument."
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root_check
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;;
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# Remove packages.
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r*)
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shift
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[ "$1" ] || die "'kiss remove' requires an argument."
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root_check
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;;
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# List installed packages.
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l*)
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shift
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pkg_list "$@"
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;;
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# Print version and exit.
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v*)
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log "$kiss 0.1.10"
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;;
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# Catch all invalid arguments as well as
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# any help related flags (-h, --help, help).
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*)
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log "$kiss [b|c|i|l|r|u] [pkg]" \
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"build: Build a package." \
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"checksum: Generate checksums." \
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"install: Install a package (Runs build if needed)." \
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"list: List packages." \
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"remove: Remove a package." \
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"update: Check for updates."
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;;
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esac
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}
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main() {
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# Store the script name in a variable and use it everywhere
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# in place of 'kiss'. This allows the script name to be changed
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# easily.
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kiss=${0##*/}
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# The PID of the current shell process is used to isolate directories
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# to each specific KISS instance. This allows multiple package manager
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# instances to be run at once. Store the value in another variable so
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# that it doesn't change beneath us.
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pid=$$
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# Catch errors and ensure that build files and directories are cleaned
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# up before we die. This occurs on 'Ctrl+C' as well as sucess and error.
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trap pkg_clean EXIT INT
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setup_caching
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args "$@"
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}
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main "$@"
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