94 lines
3.3 KiB
Bash
Executable file
94 lines
3.3 KiB
Bash
Executable file
#!/usr/bin/env sh
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: \
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&& warn() { printf >&2 '\033[1m%s:\033[m %s\n' acquire "$*" ;} \
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&& die() { warn "$@"; exit 64 ;} \
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&& missing()
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{ : \
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&& [ ${#3} != 0 ] \
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|| { warn "missing a required $1: $2"; ok=0 ;} \
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;} \
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&& ok=1 from= repo= commit= checksum= \
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\
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&& if [ "$#" != 0 ] \
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;then : \
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&& for arg in "$@" \
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;do : \
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&& rhs="${arg#*=}" \
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&& a="${arg%"$rhs"}" \
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&& b="${a%=}" \
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&& if [ ${#a} = ${#b} ] \
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|| [ ${#b} = 0 ] \
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;then : \
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&& warn "ignoring bare argument: $arg" \
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&& continue \
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;fi \
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&& lhs="${b#*[!-0-9A-Z_a-z]}" \
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&& if [ ${#lhs} != ${#b} ] \
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;then : \
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&& warn "ignoring invalid key: $b" \
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&& warn "it became invalid at: ${b#"${b%?"$lhs"}"}" \
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&& continue \
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;fi \
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&& case "$lhs" in \
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(from) from="$rhs" ;; \
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(repo) repo="$rhs" ;; \
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(dest) dest="$rhs" ;; \
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(commit) commit="$rhs" ;; \
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(checksum) checksum="$rhs" ;; \
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(*) warn "ignoring unknown key: $lhs" ;; \
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esac \
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|| exit \
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;done \
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&& { [ "${#from}" != 0 ] || die "missing a required key: from" ;} \
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&& if [ "$from" = github ] || [ "$from" = sourcehut ] \
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;then : \
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&& missing key repo "$repo" \
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&& missing key commit "$commit" \
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&& missing key checksum "$checksum" \
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&& { [ $ok = 1 ] || exit 64 ;} \
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&& username="${repo%%/*}" && project="${repo##*/}" \
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&& if [ ".$username/$project" != ".$repo" ] \
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;then : \
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&& warn "invalid value for key: repo=$repo" \
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&& die "expected format: repo=username/project" \
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;fi \
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&& remote_fn="$commit.tar.gz" \
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&& local_fn="$username!$project-$remote_fn" \
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&& pathy="$repo/archive/$remote_fn" \
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&& case "$from" in
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(github) remote_url="https://github.com/$pathy" ;; \
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(sourcehut) remote_url="https://git.sr.ht/~$pathy" ;; \
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esac \
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&& sha256="$checksum" \
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&& { [ "${#dest}" != 0 ] || dest="${repo##*/}" ;} \
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;else : \
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&& die "unknown value specified for \"from\": $from" \
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;fi \
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|| exit \
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;fi \
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\
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&& { [ -d "/tmp" ] || die '/tmp must be mounted (or just exist)' ;} \
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&& missing variable dest "$dest" \
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&& missing variable local_fn "$local_fn" \
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&& missing variable remote_url "$remote_url" \
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&& missing variable sha256 "$sha256" \
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&& { [ $ok = 1 ] || exit 64 ;} \
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&& { : \
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&& printf '%s %s\n' "$sha256" "$local_fn" | sha256sum -c - >/dev/null 2>&1 \
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|| wget -q "$remote_url" -O "$local_fn" \
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&& printf '%s %s\n' "$sha256" "$local_fn" | sha256sum -c - \
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|| { sha256sum "$local_fn"; exit 1 ;} \
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;} \
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&& temp="$(mktemp -d)" \
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&& tar -axof "$local_fn" -C "$temp" \
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&& find "$temp" -mindepth 1 -maxdepth 1 >/tmp/files \
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&& find "$temp" -mindepth 1 -maxdepth 1 -type d >/tmp/dirs \
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&& { [ -d "$dest" ] || mkdir "$dest" ;} \
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&& if [ "$(wc -l </tmp/files)" = 1 ] && [ "$(wc -l </tmp/dirs)" = 1 ] \
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;then : \
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&& find "$temp" -mindepth 2 -maxdepth 2 -exec cp -rp {} "$dest" + \
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;else : \
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&& cp -rp "$temp" "$dest" \
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;fi \
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;
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