initial commit.

LICENSE

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+The MIT License (MIT)
+
+Copyright 2020 "yafox"
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README

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+# chin
+
+abbreviation of "chroot in."
+
+sets up /proc, /dev, /sys, and /tmp directories if they do not already exist in
+the target directory, chroots into the target directory and executes the given
+command, and then tears down whatever directories it set up upon exiting.
+
+designed to set up build environments for code that already comes from a trusted
+source.  do not assume the resulting chroot conveys any sort of security!
+consider this an organizational tool more than anything else.
+
+40 SLOC.
+
+usage: chin.sh <chroot target> <commands>

chin.sh

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+#!/bin/sh
+
+set -e
+
+if [ ! -n "$1" ]; then
+    echo "usage: $(basename $0) <chroot target> <commands>"
+    exit 0
+fi
+
+# if this is running on an interactive
+# terminal (as opposed to in a script), if tput is installed, and if tput
+# knows some color codes, then set the color values.
+if [ -t 1 ] && [ "$(tput colors 2>/dev/null || echo 0)" -ge 8 ]; then
+	_clr="$(tput sgr0)"
+	_red="$(tput setaf 1)"
+fi
+
+err() {
+    echo "$_red[ERR]$_clr $@" >&2
+    exit 1
+}
+
+tgt="$1"
+shift
+
+[ -d "$tgt" ] || err "no such directory as '$tgt'"
+
+[ "$(stat -Lt "$tgt")" != "$(stat -Lt "/")" ] \
+|| err "chroot target points to /! did something go wrong? exiting."
+
+# if the user already did some of the necessary prep, don't mess with it.
+[ -e "$tgt/proc" ] || export _proc="skip"
+[ -e "$tgt/dev" ] || export _dev="skip"
+[ -e "$tgt/sys" ] || export _sys="skip"
+[ -e "$tgt/tmp" ] || export _tmp="skip"
+
+[ -z "$_proc" ] || { mkdir "$tgt/proc" && mount -n -t proc proc "$tgt/proc"; }
+[ -z "$_dev" ] || { mkdir "$tgt/dev" && mount -o bind /dev "$tgt/dev"; }
+[ -z "$_sys" ] || { mkdir "$tgt/sys" && mount -n -t sysfs sys "$tgt/sys"; }
+[ -z "$_tmp" ] || { mkdir "$tgt/tmp" && mount -n -t tmpfs tmpfs "$tgt/tmp"; }
+
+cleanup() {
+	[ -z "$_tmp" ] || { umount "$tgt/tmp" && rmdir "$tgt/tmp"; }
+	[ -z "$_sys" ] || { umount "$tgt/sys" && rmdir "$tgt/sys"; }
+	[ -z "$_dev" ] || { umount "$tgt/dev" && rmdir "$tgt/dev"; }
+	[ -z "$_proc" ] || { umount "$tgt/proc" && rmdir "$tgt/proc"; }
+}
+trap cleanup EXIT INT HUP
+
+cd -- "$tgt"
+chroot . sh -c "$@"
+cd - >/dev/null

makefile

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+ROOTDIR = $(dir $(realpath $(firstword $(MAKEFILE_LIST))))
+PREFIX ?= /usr
+DESTDIR ?= $(PREFIX)/bin
+
+install:
+	cp -a $(ROOTDIR)/chin.sh $(DESTDIR)/chin
+
+uninstall:
+	rm $(DESTDIR)/chin

sloc.sh

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+#!/bin/sh
+
+# find all *.sh files not under `pkg` that are not symbolic links, strip all
+# trailing whitespace, then all leading whitespace, then all lines starting
+# with '#', then all empty lines. then count the remaining lines.
+
+find . -name "*.sh" ! -path "**/pkg/**" ! -type l \
+| xargs sed 's/[[:space:]]*$//g; s/^[[:space:]]*//g; s/^#.*$//g; /^$/d' \
+| wc -l - \
+| cut -d' ' -f1
+
+# note that this script's ELOC is also included in the count.