2 # redo-ifchange – bourne shell implementation of DJB redo
3 # Copyright © 2014 Nils Dagsson Moskopp (erlehmann)
5 # This program is free software: you can redistribute it and/or modify
6 # it under the terms of the GNU Affero General Public License as
7 # published by the Free Software Foundation, either version 3 of the
8 # License, or (at your option) any later version.
10 # Dieses Programm hat das Ziel, die Medienkompetenz der Leser zu
11 # steigern. Gelegentlich packe ich sogar einen handfesten Buffer
12 # Overflow oder eine Format String Vulnerability zwischen die anderen
13 # Codezeilen und schreibe das auch nicht dran.
18 # Do not record circular dependencies.
19 [ "$parent" = "$dependency" ] && exit 1
20 local base; _dirsplit "$parent"
21 [ -d "$REDO_DIR/$dir" ] || mkdir -p "$REDO_DIR/$dir"
22 # Naive implementation: Append dependency, then remove double dependencies.
23 dependencies=$( (echo "$dependency"; cat "$REDO_DIR/$parent".dependencies 2>/dev/null ) | sort -u)
24 echo "$dependencies" > "$REDO_DIR/$parent".dependencies
25 # FIXME: Remove added dependency from non-existence dependencies.
28 _add_dependency_ne() {
31 # Do not record circular dependencies.
32 [ "$parent" = "$dependency_ne" ] && exit 1
33 # Do not record existing files as non-existence dependencies.
34 [ -e "$dependency_ne" ] && return
35 local base; _dirsplit "$parent"
36 [ -d "$REDO_DIR/$dir" ] || mkdir -p "$REDO_DIR/$dir"
37 # Naive implementation: Append dependency, then remove double dependencies.
38 dependencies_ne=$( (echo "$dependency_ne"; cat "$REDO_DIR/$parent".dependencies_ne 2>/dev/null ) | sort -u)
39 echo "$dependencies_ne" > "$REDO_DIR/$parent".dependencies_ne
40 # FIXME: Remove added non-existence dependency from dependencies.
45 # Exit if called without a target.
46 [ -z "$target" ] && exit 1
47 local base; _dirsplit "$target"
48 [ -d "$REDO_DIR/$dir" ] || mkdir -p "$REDO_DIR/$dir"
49 # If target file exists, record ctime and md5sum.
50 if [ -e "$target" ]; then
51 stat -c%Y "$target" > "$REDO_DIR/$target".ctime
52 md5sum < "$target" > "$REDO_DIR/$target".md5sum
56 _dependencies_uptodate() {
58 target_relpath=${target##$REDO_BASE/}
59 # If no dependencies exist, they are by definition up to date.
60 if [ ! -e "$REDO_DIR/$target".dependencies ]; then
61 _echo_debug_message "$REDO_DEPTH$dir$target_relpath has no dependencies."
64 _echo_debug_message "$REDO_DEPTH$dir$target_relpath non-existant dependency check:"
65 dependencies_ne=$(cat "$REDO_DIR/$target".dependencies_ne 2>/dev/null || :)
66 for dependency_ne in $dependencies_ne; do
67 dependency_ne_relpath=${dependency_ne##$REDO_BASE/}
68 _echo_debug_message "$REDO_DEPTH$dir$target_relpath depends on non-existence of $dependency_ne_relpath"
69 # If a non-existence dependency exists, it is out of date.
70 # Dependencies, e.g. on default.do files may also be out of date.
71 # Naive implementation: Delete dependency information and rebuild.
72 if [ -e "$dependency_ne" ]; then
73 rm "$REDO_DIR/$target".dependencies
74 rm "$REDO_DIR/$target".dependencies_ne
76 # If a non-existence dependency does not exist, but is also a
77 # dependency, it existed in the past. Naive implementation: Delete
78 # dependency information and pretend the (actually up-to-date)
79 # dependency is out of date to generate dependency information.
80 # TODO: Only remove non-existence dependency from dependencies,
81 # and do no return at this point; maybe escape filename properly.
82 elif (grep -q '^'"$dependency_ne"'$' "$REDO_DIR/$target".dependencies \
84 rm "$REDO_DIR/$target".dependencies
88 _echo_debug_message "$REDO_DEPTH$dir$target_relpath non-existence dependencies uptodate."
89 _echo_debug_message "$REDO_DEPTH$dir$target_relpath dependency check:"
90 if [ "$REDO_SHUFFLE" = "1" ]; then
91 dependencies=$(shuf "$REDO_DIR/$target".dependencies 2>/dev/null || :)
93 dependencies=$(cat "$REDO_DIR/$target".dependencies 2>/dev/null || :)
95 for dependency in $dependencies; do
96 dependency_relpath=${dependency##$REDO_BASE/}
98 _echo_debug_message "$REDO_DEPTH$dir$target_relpath depends on $dependency_relpath"
99 if ( ! _is_uptodate "$dependency" ); then
100 _echo_debug_message \
101 "$REDO_DEPTH$dir$target_relpath dependency $dependency_relpath not uptodate."
104 if ( ! _dependencies_uptodate "$dependency"); then
105 _echo_debug_message \
106 "$REDO_DEPTH$dir$target_relpath dependency $dependency_relpath dependencies not uptodate."
109 # In the case that two targets depend on the same target and are
110 # built after another, when the second target is built, redo finds
111 # its dependencies to be up-to-date. This implies that the second
112 # target would not be built. If a dependency build timestamp is
113 # greater than or equal to a targets build timestamp, assume the
114 # dependency has been rebuilt and the target should be rebuilt.
115 target_ts="$(cat "$REDO_DIR/$target_abspath.buildtime" 2>/dev/null || echo 0)"
116 dependency_ts="$(cat "$REDO_DIR/$dependency.buildtime" 2>/dev/null || echo 0)"
117 if [ "$dependency_ts" -ge "$target_ts" ]; then
118 _echo_debug_message \
119 "$REDO_DEPTH$dir$target_relpath dependency $dependency_relpath uptodate, but built later than $target_relpath."
123 _echo_debug_message "$REDO_DEPTH$dir$target_relpath dependencies uptodate."
134 xdir="$1" xbase="$2" xbasetmp="$2"
135 while [ ! -d "$xdir" -a -n "$xdir" ]; do
136 _dirsplit "${xdir%/}"
137 xbasetmp=${base}__"$xbase"
138 xdir="$dir" xbase="$base"/"$xbase"
139 echo "xbasetmp='$xbasetmp'" >&2
144 local dir="$1" target="$2" tmp="$3"
145 # Add target to parent targets dependencies.
146 target_abspath="$PWD/$target"
147 if [ -n "$REDO_TARGET" ]; then
148 _add_dependency "$REDO_TARGET" "$target_abspath"
150 target_relpath="${target_abspath##$REDO_BASE/}"
151 if ( ! _is_uptodate "$target_abspath" || ! _dependencies_uptodate "$target_abspath" ); then
155 [ -e "$target.do" ] || _find_dofile "$target"
156 # Add non existing .do file to non-existence dependencies so target is built when
157 # .do file in question is created.
158 _add_dependency_ne "$(readlink -f "$target")" "$PWD/$target.do"
159 if [ ! -e "$dofile" ]; then
160 # If .do file does not exist and target exists, it is a source file.
161 if [ -e "$target" ]; then
162 _add_target "$(readlink -f $target)"
163 # Portable timestamps for systems supporting GNU date format '%N'.
164 date +%s%N | tr -d '%N' > "$REDO_DIR/$target_abspath".buildtime
166 # If .do file does not exist and target does not exist, stop.
168 echo "redo: $target: no .do file" >&2
171 # Add .do file to dependencies so target is built when .do file changes.
173 _add_dependency "$(readlink -f "$target")" "$PWD/$dofile"
174 _add_target "$PWD/$dofile"
176 printf '%sredo %s%s%s%s%s\n' \
177 "$green" "$REDO_DEPTH" "$bold" "$target_relpath" "$plain" >&2
178 ( _run_dofile "$target" "$base" "$tmp.tmp" )
180 if [ $rv != 0 ]; then
181 rm -f "$tmp.tmp" "$tmp.tmp2"
182 # Exit code 123 conveys that target was considered uptodate at runtime.
183 if [ $rv != 123 ]; then
184 printf "%sredo: %s%s: got exit code %s.%s\n" \
185 "$red" "$REDO_DEPTH" "$target" "$rv" "$plain" >&2
189 mv "$tmp.tmp" "$target" 2>/dev/null ||
190 ! test -s "$tmp.tmp2" ||
191 mv "$tmp.tmp2" "$target" 2>/dev/null
193 # Portable timestamps for systems supporting GNU date format '%N'.
194 date +%s%N | tr -d '%N' > "$REDO_DIR/$target_abspath".buildtime
196 _echo_debug_message "$REDO_DEPTH$dir$target is up to date."
198 _add_target "$(readlink -f $target)"
201 _echo_debug_message() {
202 [ "$REDO_DEBUG" = "1" ] && echo "$@" >&2
208 _find_dofile_pwd "$1"
209 [ -e "$dofile" ] && break
210 [ "$PWD" = "/" ] && break
211 target=${PWD##*/}/"$target"
212 tmp=${PWD##*/}/"$tmp"
213 prefix=${PWD##*/}/"$prefix"
216 base="$prefix""$base"
220 dofile=default."$1".do
222 dofile=default.${dofile#default.*.}
223 [ -e "$dofile" -o "$dofile" = default.do ] && break
225 ext=${dofile#default}
232 target_relpath=${target##$REDO_BASE/}
233 # If a target does not exist, it is by definition out of date.
234 if [ ! -e "$target" ]; then
235 _echo_debug_message "$REDO_DEPTH$dir$target_relpath does not exist."
238 # If a file exists, but has no build date, it is by a previously unseen
239 # source file. A previously unseen source file is by definition up to date.
240 if [ ! -e "$REDO_DIR/$target".ctime ]; then
241 _echo_debug_message "$REDO_DEPTH$dir$target_relpath.ctime does not exist."
242 # Add source file to dependencies so target is built when source file changes.
243 _add_target "$(readlink -f $target)"
246 _echo_debug_message "$REDO_DEPTH$dir$target_relpath.ctime exists."
247 # If a file exists and has an entry in the always database, it is never
249 if [ -e "$REDO_DIR/$target".always ]; then
250 _echo_debug_message "$REDO_DEPTH$dir$target_relpath.always exists."
253 # If a file exists and has an entry in the stamp database, it might not
254 # be up to date. redo-stamp decides if the file is up to date at runtime.
255 if [ -e "$REDO_DIR/$target".stamp ]; then
256 _echo_debug_message "$REDO_DEPTH$dir$target_relpath.stamp exists."
259 # If a file exists and has an entry in the dependency database and ctime
260 # is the same as in the entry in the ctime database, it is up to date.
261 if [ "$(cat "$REDO_DIR/$target".ctime 2>/dev/null || :)" = \
262 "$(stat -c%Y "$target")" ]; then
263 _echo_debug_message "$REDO_DEPTH$dir$target_relpath.ctime match."
266 _echo_debug_message "$REDO_DEPTH$dir$target_relpath.ctime mismatch."
267 # If a file exists and has an entry in the dependency database and
268 # ctime is different from the entry in the ctime database, but md5sum
269 # is the same as md5sum in the md5sum database, it is up to date.
270 if [ "$(cat "$REDO_DIR/$target".md5sum 2>/dev/null || :)" = \
271 "$(md5sum < "$target")" ]; then
272 _echo_debug_message "$REDO_DEPTH$dir$target_relpath.md5sum match."
275 _echo_debug_message "$REDO_DEPTH$dir$target_relpath.md5sum mismatch."
285 export REDO_DEPTH="$REDO_DEPTH "
286 export REDO_TARGET="$PWD"/"$target"
289 read line1 <"$PWD/$dofile" || true
291 # If the first line of a do file does not have a hashbang (#!), use /bin/sh.
292 if [ "$cmd" = "$line1" ] || [ "$cmd" = "/bin/sh" ]; then
293 if [ "$REDO_XTRACE" = "1" ]; then
299 $cmd "$PWD/$dofile" "$@" >"$tmp.tmp2"
306 _dir_shovel "$dir" "$base"
307 dir="$xdir" base="$xbase" basetmp="$xbasetmp"
308 ( cd "$dir" && _do "$dir" "$base" "$basetmp" )
309 [ "$?" = 0 ] || exit 1