Michał Górny <mgo...@gentoo.org> writes:
> Unpack crates in parallel using xargs to utilize multicore systems
> better. Perform checksumming via a single sha256sum invocation.
>
> For dev-python/watchfiles, this speeds up unpacking on my machine
> from 2.6 s to 0.75 s (warm cache).
>
> Signed-off-by: Michał Górny <mgo...@gentoo.org>
For completeness (acked on PR), lgtm. I assume tested by building
all cargo inheritees (nearly said 'heirs' but.. lol)?
Give a chance for others to look though.
Also, thank you!
> ---
> eclass/cargo.eclass | 56 ++++++++++++++++++++++++++-------------------
> 1 file changed, 33 insertions(+), 23 deletions(-)
>
> diff --git a/eclass/cargo.eclass b/eclass/cargo.eclass
> index 0f2da982f60c..5a16d3a30528 100644
> --- a/eclass/cargo.eclass
> +++ b/eclass/cargo.eclass
> @@ -329,40 +329,50 @@ _cargo_gen_git_config() {
> cargo_src_unpack() {
> debug-print-function ${FUNCNAME} "$@"
>
> - mkdir -p "${ECARGO_VENDOR}" || die
> - mkdir -p "${S}" || die
> + mkdir -p "${ECARGO_VENDOR}" "${S}" || die
>
> local archive shasum pkg
> + local crates=()
> for archive in ${A}; do
> case "${archive}" in
> *.crate)
> - # when called by pkgdiff-mg, do not unpack
> crates
> - [[ ${PKGBUMPING} == ${PVR} ]] && continue
> -
> - ebegin "Loading ${archive} into Cargo registry"
> - tar -xf "${DISTDIR}"/${archive} -C
> "${ECARGO_VENDOR}/" || die
> - # generate sha256sum of the crate itself as
> cargo needs this
> - shasum=$(sha256sum "${DISTDIR}"/${archive} |
> cut -d ' ' -f 1)
> - pkg=$(basename ${archive} .crate)
> - cat <<- EOF >
> ${ECARGO_VENDOR}/${pkg}/.cargo-checksum.json
> - {
> - "package": "${shasum}",
> - "files": {}
> - }
> - EOF
> - # if this is our target package we need it in
> ${WORKDIR} too
> - # to make ${S} (and handle any revisions too)
> - if [[ ${P} == ${pkg}* ]]; then
> - tar -xf "${DISTDIR}"/${archive} -C
> "${WORKDIR}" || die
> - fi
> - eend $?
> + crates+=( "${archive}" )
> ;;
> *)
> - unpack ${archive}
> + unpack "${archive}"
> ;;
> esac
> done
>
> + if [[ ${PKGBUMPING} != ${PVR} ]]; then
> + pushd "${DISTDIR}" >/dev/null || die
> +
> + ebegin "Unpacking crates"
> + printf '%s\0' "${crates[@]}" |
> + xargs -0 -P "$(makeopts_jobs)" -n 1 -- \
> + tar -x -C "${ECARGO_VENDOR}" -f
> + assert
> + eend $?
> +
> + while read -d '' -r shasum archive; do
> + pkg=${archive%.crate}
> + cat <<- EOF >
> ${ECARGO_VENDOR}/${pkg}/.cargo-checksum.json || die
> + {
> + "package": "${shasum}",
> + "files": {}
> + }
> + EOF
> +
> + # if this is our target package we need it in
> ${WORKDIR} too
> + # to make ${S} (and handle any revisions too)
> + if [[ ${P} == ${pkg}* ]]; then
> + tar -xf "${archive}" -C "${WORKDIR}" || die
> + fi
> + done < <(sha256sum -z "${crates[@]}" || die)
> +
> + popd >/dev/null || die
> + fi
> +
> cargo_gen_config
> }
