commit
45e1613787
5 changed files with 511 additions and 0 deletions
@ -0,0 +1,18 @@
|
||||
#+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.) |
@ -0,0 +1,446 @@
|
||||
#!/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 |
@ -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 |
Loading…
Reference in new issue