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Initial commit; add toolchain

master
Michael Raitza 6 months ago
commit
45e1613787
  1. 4
      .gitignore
  2. 18
      README.org
  3. 446
      do
  4. 3
      tmp/.gitignore
  5. 40
      tmp/default.do

4
.gitignore

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result
/.redo
**/.do_built*
**/*.did

18
README.org

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#+TITLE: Nix flake
#+AUTHOR: spacefrogg
#+EMAIL: git@spacefrogg.net
#+options: toc:nil
* Development
This comes with a self-contained redo toolchain to help in working with the
flake. It basically deploys any input flake into the =tmp= directory for easier
access.
redo targets under =tmp/= come in three kinds:
- =clean= :: will remove all build products under =tmp/=
- =<flake>= :: will make sure a store path to =<flake>= exists and puts an
indirect root into =tmp/<flake>=.
- =<flake>.rw= :: will make sure a store path to =<flake>= exists and will
copy its contents to =tmp/.<flake>.rw= and will link to it from
=tmp/<flake>.rw=. (Rationale: On Linux, directories cannot denote reliable
targets due to their non-trivial relation to modification time.)

446
do

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#!/usr/bin/env sh
#
# A minimal alternative to djb redo that doesn't support incremental builds.
# For the full version, visit http://github.com/apenwarr/redo
#
# The author disclaims copyright to this source file and hereby places it in
# the public domain. (2010 12 14; updated 2019 02 24)
#
USAGE="
usage: do [-d] [-x] [-v] [-c] <targets...>
-d print extra debug messages (mostly about dependency checks)
-v run .do files with 'set -v'
-x run .do files with 'set -x'
-c clean up all old targets before starting
Note: do is an implementation of redo that does *not* check dependencies.
It will never rebuild a target it has already built, unless you use -c.
"
# CDPATH apparently causes unexpected 'cd' output on some platforms.
unset CDPATH
# By default, no output coloring.
green=""
bold=""
plain=""
if [ -n "$TERM" -a "$TERM" != "dumb" ] && tty <&2 >/dev/null 2>&1; then
green="$(printf '\033[32m')"
bold="$(printf '\033[1m')"
plain="$(printf '\033[m')"
fi
# The 'seq' command is not available on all platforms.
_seq() {
local x=0 max="$1"
while [ "$x" -lt "$max" ]; do
x=$((x + 1))
echo "$x"
done
}
# Split $1 into a dir part ($_dirsplit_dir) and base filename ($_dirsplit_base)
_dirsplit() {
_dirsplit_base=${1##*/}
_dirsplit_dir=${1%$_dirsplit_base}
}
# Like /usr/bin/dirname, but avoids a fork and uses _dirsplit semantics.
qdirname() (
_dirsplit "$1"
dir=${_dirsplit_dir%/}
echo "${dir:-.}"
)
_dirsplit "$0"
REDO=$(cd "$(env pwd -P)" &&
cd "${_dirsplit_dir:-.}" &&
echo "$PWD/$_dirsplit_base")
export REDO
_cmd=$_dirsplit_base
DO_TOP=
if [ -z "$DO_BUILT" ]; then
export _do_opt_debug=
export _do_opt_exec=
export _do_opt_verbose=
export _do_opt_clean=
fi
while getopts 'dxvcj:h?' _opt; do
case $_opt in
d) _do_opt_debug=1 ;;
x) _do_opt_exec=x ;;
v) _do_opt_verbose=v ;;
c) _do_opt_clean=1 ;;
j) ;; # silently ignore, for compat with real redo
\?|h|*) printf "%s" "$USAGE" >&2
exit 99
;;
esac
done
shift "$((OPTIND - 1))"
_debug() {
[ -z "$_do_opt_debug" ] || echo "$@" >&2
}
if [ -z "$DO_BUILT" -a "$_cmd" != "redo-whichdo" ]; then
DO_TOP=1
if [ "$#" -eq 0 ] && [ "$_cmd" = "do" -o "$_cmd" = "redo" ]; then
set all # only toplevel redo has a default target
fi
export DO_STARTDIR="$(env pwd -P)"
# If starting /bin/pwd != $PWD, this will fix it.
# That can happen when $PWD contains symlinks that the shell is
# trying helpfully (but unsuccessfully) to hide from the user.
cd "$DO_STARTDIR" || exit 99
export DO_BUILT="$PWD/.do_built"
if [ -z "$_do_opt_clean" -a -e "$DO_BUILT" ]; then
echo "do: Incremental mode. Use -c for clean rebuild." >&2
fi
: >>"$DO_BUILT"
sort -u "$DO_BUILT" >"$DO_BUILT.new"
while read f; do
[ -n "$_do_opt_clean" ] && printf "%s\0%s.did\0" "$f" "$f"
printf "%s.did.tmp\0" "$f"
done <"$DO_BUILT.new" |
xargs -0 rm -f 2>/dev/null
mv "$DO_BUILT.new" "$DO_BUILT"
export DO_PATH="$DO_BUILT.dir"
export PATH="$DO_PATH:$PATH"
rm -rf "$DO_PATH"
mkdir "$DO_PATH"
for d in redo redo-ifchange redo-whichdo; do
ln -s "$REDO" "$DO_PATH/$d"
done
for d in redo-ifcreate redo-stamp redo-always redo-ood \
redo-targets redo-sources; do
echo "#!/bin/sh" >"$DO_PATH/$d"
chmod a+rx "$DO_PATH/$d"
done
fi
# Chop the "file" part off a /path/to/file pathname.
# Note that if the filename already ends in a /, we just remove the slash.
_updir()
{
local v="${1%/*}"
[ "$v" != "$1" ] && echo "$v"
# else "empty" which means we went past the root
}
# Returns true if $1 starts with $2.
_startswith()
{
[ "${1#"$2"}" != "$1" ]
}
# Returns true if $1 ends with $2.
_endswith()
{
[ "${1%"$2"}" != "$1" ]
}
# Prints $1 if it's absolute, or $2/$1 if $1 is not absolute.
_abspath()
{
local here="$2" there="$1"
if _startswith "$1" "/"; then
echo "$1"
else
echo "$2/$1"
fi
}
# Prints $1 as a path relative to $PWD (not starting with /).
# If it already doesn't start with a /, doesn't change the string.
_relpath()
{
local here="$2" there="$1" out= hadslash=
#echo "RP start '$there' hs='$hadslash'" >&2
_startswith "$there" "/" || { echo "$there" && return; }
[ "$there" != "/" ] && _endswith "$there" "/" && hadslash=/
here=${here%/}/
while [ -n "$here" ]; do
#echo "RP out='$out' here='$here' there='$there'" >&2
[ "${here%/}" = "${there%/}" ] && there= && break;
[ "${there#$here}" != "$there" ] && break
out=../$out
_dirsplit "${here%/}"
here=$_dirsplit_dir
done
there=${there#$here}
if [ -n "$there" ]; then
echo "$out${there%/}$hadslash"
else
echo "${out%/}$hadslash"
fi
}
# Prints a "normalized relative" path, with ".." resolved where possible.
# For example, a/b/../c will be reduced to just a/c.
_normpath()
(
local path="$1" relto="$2" out= isabs=
#echo "NP start '$path'" >&2
if _startswith "$path" "/"; then
isabs=1
else
path="${relto%/}/$path"
fi
set -f
IFS=/
for d in ${path%/}; do
#echo "NP out='$out' d='$d'" >&2
if [ "$d" = ".." ]; then
out=$(_updir "${out%/}")/
else
out=$out$d/
fi
done
#echo "NP out='$out' (done)" >&2
out=${out%/}
if [ -n "$isabs" ]; then
echo "${out:-/}"
else
_relpath "${out:-/}" "$relto"
fi
)
# Prints a "real" path, with all symlinks resolved where possible.
_realpath()
{
local path="$1" relto="$2" isabs= rest=
if _startswith "$path" "/"; then
isabs=1
else
path="${relto%/}/$path"
fi
(
for d in $(_seq 100); do
#echo "Trying: $PWD--$path" >&2
if cd -P "$path" 2>/dev/null; then
# success
pwd=$(env pwd -P)
#echo " chdir ok: $pwd--$rest" >&2
np=$(_normpath "${pwd%/}/$rest" "$relto")
if [ -n "$isabs" ]; then
echo "$np"
else
_relpath "$np" "$relto"
fi
break
fi
_dirsplit "${path%/}"
path=$_dirsplit_dir
rest="$_dirsplit_base/$rest"
done
)
}
# List the possible names for default*.do files in dir $1 matching the target
# pattern in $2. We stop searching when we find the first one that exists.
_find_dofiles_pwd()
{
local dodir="$1" dofile="$2"
_startswith "$dofile" "default." || dofile=${dofile#*.}
while :; do
dofile=default.${dofile#default.*.}
echo "$dodir$dofile"
[ -e "$dodir$dofile" ] && return 0
[ "$dofile" = default.do ] && break
done
return 1
}
# List the possible names for default*.do files in $PWD matching the target
# pattern in $1. We stop searching when we find the first name that works.
# If there are no matches in $PWD, we'll search in .., and so on, to the root.
_find_dofiles()
{
local target="$1" dodir= dofile= newdir=
_debug "find_dofile: '$PWD' '$target'"
dofile="$target.do"
echo "$dofile"
[ -e "$dofile" ] && return 0
# Try default.*.do files, walking up the tree
_dirsplit "$dofile"
dodir=$_dirsplit_dir
dofile=$_dirsplit_base
[ -n "$dodir" ] && dodir=${dodir%/}/
[ -e "$dodir$dofile" ] && return 0
for i in $(_seq 100); do
[ -n "$dodir" ] && dodir=${dodir%/}/
#echo "_find_dofiles: '$dodir' '$dofile'" >&2
_find_dofiles_pwd "$dodir" "$dofile" && return 0
newdir=$(_realpath "${dodir}.." "$PWD")
[ "$newdir" = "$dodir" ] && break
dodir=$newdir
done
return 1
}
# Print the last .do file returned by _find_dofiles.
# If that file exists, returns 0, else 1.
_find_dofile()
{
local files="$(_find_dofiles "$1")"
rv=$?
#echo "files='$files'" >&2
[ "$rv" -ne 0 ] && return $rv
echo "$files" | {
while read -r linex; do line=$linex; done
printf "%s\n" "$line"
}
}
# Actually run the given $dofile with the arguments in $@.
# Note: you should always run this in a subshell.
_run_dofile()
{
export DO_DEPTH="$DO_DEPTH "
export REDO_TARGET="$PWD/$target"
local line1
set -e
read line1 <"$PWD/$dofile" || true
cmd=${line1#"#!/"}
if [ "$cmd" != "$line1" ]; then
set -$_do_opt_verbose$_do_opt_exec
exec /$cmd "$PWD/$dofile" "$@"
else
set -$_do_opt_verbose$_do_opt_exec
# If $dofile is empty, "." might not change $? at
# all, so we clear it first with ":".
:; . "$PWD/$dofile"
fi
}
# Find and run the right .do file, starting in dir $1, for target $2,
# providing a temporary output file as $3. Renames the temp file to $2 when
# done.
_do()
{
local dir="$1" target="$1$2" tmp="$1$2.redo.tmp" tdir=
local dopath= dodir= dofile= ext=
if [ "$_cmd" = "redo" ] ||
( [ ! -e "$target" -o -d "$target" ] &&
[ ! -e "$target.did" ] ); then
printf '%sdo %s%s%s%s\n' \
"$green" "$DO_DEPTH" "$bold" "$target" "$plain" >&2
dopath=$(_find_dofile "$target")
if [ ! -e "$dopath" ]; then
echo "do: $target: no .do file ($PWD)" >&2
return 1
fi
_dirsplit "$dopath"
dodir=$_dirsplit_dir dofile=$_dirsplit_base
if _startswith "$dofile" "default."; then
ext=${dofile#default}
ext=${ext%.do}
else
ext=
fi
target=$PWD/$target
tmp=$PWD/$tmp
cd "$dodir" || return 99
target=$(_relpath "$target" "$PWD") || return 98
tmp=$(_relpath "$tmp" "$PWD") || return 97
base=${target%$ext}
tdir=$(qdirname "$target")
[ ! -e "$DO_BUILT" ] || [ ! -w "$tdir/." ] ||
: >>"$target.did.tmp"
# $qtmp is a temporary file used to capture stdout.
# Since it might be accidentally deleted as a .do file
# does its work, we create it, then open two fds to it,
# then immediately delete the name. We use one fd to
# redirect to stdout, and the other to read from after,
# because there's no way to fseek(fd, 0) in sh.
qtmp=$DO_PATH/do.$$.tmp
(
rm -f "$qtmp"
( _run_dofile "$target" "$base" "$tmp" >&3 3>&- 4<&- )
rv=$?
if [ $rv != 0 ]; then
printf "do: %s%s\n" "$DO_DEPTH" \
"$target: got exit code $rv" >&2
rm -f "$tmp.tmp" "$tmp.tmp2" "$target.did"
return $rv
fi
echo "$PWD/$target" >>"$DO_BUILT"
if [ ! -e "$tmp" ]; then
# if $3 wasn't created, copy from stdout file
cat <&4 >$tmp
# if that's zero length too, forget it
[ -s "$tmp" ] || rm -f "$tmp"
fi
) 3>$qtmp 4<$qtmp # can't use "|| return" here...
# ...because "|| return" would mess up "set -e" inside the ()
# on some shells. Running commands in "||" context, even
# deep inside, will stop "set -e" from functioning.
rv=$?
[ "$rv" = 0 ] || return "$rv"
mv "$tmp" "$target" 2>/dev/null
[ -e "$target.did.tmp" ] &&
mv "$target.did.tmp" "$target.did" ||
: >>"$target.did"
else
_debug "do $DO_DEPTH$target exists." >&2
fi
}
# Implementation of the "redo" command.
_redo()
{
local i startdir="$PWD" dir base
set +e
for i in "$@"; do
i=$(_abspath "$i" "$startdir")
(
cd "$DO_STARTDIR" || return 99
i=$(_realpath "$(_relpath "$i" "$PWD")" "$PWD")
_dirsplit "$i"
dir=$_dirsplit_dir base=$_dirsplit_base
_do "$dir" "$base"
)
[ "$?" = 0 ] || return 1
done
}
# Implementation of the "redo-whichdo" command.
_whichdo()
{
_find_dofiles "$1"
}
case $_cmd in
do|redo|redo-ifchange) _redo "$@" ;;
redo-whichdo) _whichdo "$1" ;;
do.test) ;;
*) printf "do: '%s': unexpected redo command" "$_cmd" >&2; exit 99 ;;
esac
[ "$?" = 0 ] || exit 1
if [ -n "$DO_TOP" ]; then
if [ -n "$_do_opt_clean" ]; then
echo "do: Removing stamp files..." >&2
[ ! -e "$DO_BUILT" ] ||
while read f; do printf "%s.did\0" "$f"; done <"$DO_BUILT" |
xargs -0 rm -f 2>/dev/null
fi
fi

3
tmp/.gitignore

@ -0,0 +1,3 @@
*
!*.do
!.gitignore

40
tmp/default.do

@ -0,0 +1,40 @@
#!/bin/sh
# This do script creates an indirect root to an input flake
exec >&2
redo-ifchange ../flake.nix ../flake.lock || true
resolve_flake() {
STORE_PATH=$(nix flake info --json --inputs-from .. "$2" | jq -r .path)
# Do this after 'info' to avoid unnecessary network activity. nix flake
# archive may try to download a flake although the store path is available.
if [ ! -d "$STORE_PATH" ]; then
nix flake archive --inputs-from .. "$2"
fi
}
case $2 in
# Resolves cleanup targets by their softlinks
clean)
redo-always || true
find . -type l -print -exec realpath -P --relative-base="$PWD" {} \+ |
while read p; do
if [ "$p" = "${p#/}" ]; then
rm -rf -- "$p"
fi
done
;;
*.rw)
resolve_flake "$@"
rm -rf -- ".$2"
cp --reflink=auto -r --no-preserve=mode "$STORE_PATH" ".$2"
ln -sf ".$2" "$3"
;;
*)
resolve_flake "$@"
nix-store -r "$STORE_PATH" --indirect --add-root "$2"
[ "$2" = "$3" ] || mv "$2" "$3"
;;
esac
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