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Minor changes. Mostly code/file reorganization.
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| Original file line number | Diff line number | Diff line change |
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| #! /bin/bash | ||
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| # static.sh version 20211028 | ||
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| # this script will: | ||
| # Download an x86 (32 bit) Alpine userland. | ||
| # Build a statically compiled lxroot binary in that userland. | ||
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| tgz_url='https://dl-cdn.alpinelinux.org/alpine/v3.14/releases/x86/alpine-minirootfs-3.14.2-x86.tar.gz' | ||
| tgz_sum='874f6e60047535c08ffcc8f430afec21d323b367269391279f74ff8f87420d83' | ||
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| set -o errexit | ||
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| usage () { # ---------------------------------------------------- usage | ||
| echo | ||
| echo 'usage: sh static.sh /path/to/lxroot /path/to/build_dir' ; } | ||
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| die () { echo "die $*" ; exit 1 ; } # ------------------- die | ||
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| found () { printf 'found %-8s %s\n' "$1" "$2" ; } # ----- found | ||
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| trace () { echo "+ $@" ; "$@" ; } # ---------------------- trace | ||
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| lxr () { # -------------------------------------------------------- lxr | ||
| "$lxroot" -rn "$build"/newroot -- "$@" ; } | ||
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| init () { # ------------------------------------------------------ init | ||
| [ "$build" ] || { usage ; exit 1 ; } | ||
| if [ -d "$build" ] | ||
| then found init "$build" | ||
| else trace mkdir -p "$build" ; fi | ||
| cd "$build" ; } | ||
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| fetch () ( # ---------------------------------------------------- fetch | ||
| [ -d 'dist' ] || trace mkdir dist | ||
| [ -f dist/"$tgz" ] && { found fetch dist/"$tgz" ; return ; } | ||
| cd dist | ||
| trace wget -nc "$tgz_url" ) | ||
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| checksum () { # ---------------------------------------------- checksum | ||
| local actual="$( sha256sum dist/"$tgz" )" | ||
| actual="${actual%% dist/*}" | ||
| [ "$actual" = "$tgz_sum" ] && { found checksum valid ; return ; } | ||
| echo | ||
| echo 'checksum error' | ||
| echo " expect $tgz_sum" | ||
| echo " actual $actual" | ||
| exit 1 ; } | ||
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| extract () { # ------------------------------------------------ extract | ||
| [ -d newroot ] && { found extract newroot ; return ; } | ||
| trace mkdir newroot | ||
| trace tar xzf dist/"$tgz" -C newroot ; } | ||
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| dns () { # -------------------------------------------------------- dns | ||
| local path='newroot/etc/resolv.conf' | ||
| [ -f "$path" ] && { found dns "$path" ; return ; } | ||
| trace cp /etc/resolv.conf newroot/etc/resolv.conf ; } | ||
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| apk_update () { # ------------------------------------------ apk_update | ||
| local path="newroot/root/touch_apk_update" | ||
| [ -f "$path" ] && { found update "$path" ; return ; } | ||
| trace lxr apk update | ||
| trace touch "$path" ; } | ||
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| apk_add () { # ------------------------------------------------ apk_add | ||
| local path="newroot/usr/bin/g++" | ||
| [ -f "$path" ] && { found add "$path" ; return ; } | ||
| trace lxr apk add build-base ; } | ||
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| build () { # ---------------------------------------------------- build | ||
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| # see http://ptspts.blogspot.com/2013/12/how-to-make-smaller-c-and-c-binaries.html | ||
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| local options=( | ||
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| -s | ||
| -Os | ||
| -fomit-frame-pointer | ||
| -fno-stack-protector | ||
| -ffunction-sections | ||
| -fdata-sections | ||
| -Wl,--gc-sections | ||
| -fno-unroll-loops | ||
| -fmerge-all-constants | ||
| -fno-ident | ||
| -Wl,-z,norelro | ||
| -Wl,--build-id=none | ||
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| -fno-exceptions | ||
| -fno-rtti | ||
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| # 20211028 -fvtable-gc is no longer supported | ||
| # -fvtable-gc | ||
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| ) | ||
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| echo | ||
| trace rm -f 'newroot/root/lxroot-plain' | ||
| trace rm -f 'newroot/root/lxroot-small' | ||
| trace rm -f 'newroot/root/lxroot-static' | ||
| trace cp "$src"/lxroot.cpp newroot/root/ | ||
| trace cp "$src"/help.cpp newroot/root/ | ||
| trace cp "$src"/str.cpp newroot/root/ | ||
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| echo | ||
| trace lxr time g++ lxroot.cpp -o lxroot-plain | ||
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| echo | ||
| trace lxr time g++ lxroot.cpp -o lxroot-small \ | ||
| "${options[@]}" | ||
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| echo | ||
| trace lxr time g++ lxroot.cpp -o lxroot-static \ | ||
| "${options[@]}" -static | ||
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| return ; } | ||
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| main () { # ------------------------------------------------------ main | ||
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| local src="$PWD" lxroot="$1" build="$2" | ||
| local tgz="${tgz_url##*/}" | ||
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| lxroot=` realpath "$lxroot" ` | ||
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| echo | ||
| echo 'static.sh' | ||
| echo " src $src" | ||
| echo " lxroot $lxroot" | ||
| echo " bulid $build" | ||
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| echo | ||
| init | ||
| fetch | ||
| checksum | ||
| extract | ||
| dns | ||
| apk_update | ||
| apk_add | ||
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| build | ||
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| trace cd newroot/root | ||
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| echo | ||
| echo | ||
| echo '==== size of elf sections' | ||
| size lxroot-small lxroot-plain lxroot-static | ||
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| echo | ||
| echo | ||
| echo '==== file size in bytes' | ||
| ls -lSr lxroot-* | ||
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| echo | ||
| echo | ||
| echo '==== file size in kilobytes' | ||
| ls -lSrh lxroot-* | ||
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| return ; } | ||
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| main "$@" |
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