ElementsProject · rustyrussell · Oct 17, 2025 · Oct 13, 2025 · Oct 14, 2025
diff --git a/Makefile b/Makefile
@@ -1,7 +1,7 @@
 #! /usr/bin/make
 
 # Extract version from git, or if we're from a zipfile, use dirname
-VERSION=$(shell git describe --tags --always --dirty=-modded --abbrev=7 2>/dev/null || pwd | sed -n 's|.*/c\{0,1\}lightning-v\{0,1\}\([0-9a-f.rc\-]*\)$$|v\1|gp')
+VERSION=$(shell git describe --tags --always --dirty=-modded --abbrev=7 2>/dev/null || pwd | $(SED) -n 's|.*/c\{0,1\}lightning-v\{0,1\}\([0-9a-f.rc\-]*\)$$|v\1|gp')
 
 # Next release.
 CLN_NEXT_VERSION := v25.12
@@ -318,30 +318,30 @@ else
 # Git doesn't maintain timestamps, so we only regen if sources actually changed:
 # We place the SHA inside some generated files so we can tell if they need updating.
 # Usage: $(call SHA256STAMP_CHANGED)
-SHA256STAMP_CHANGED = [ x"`sed -n 's/.*SHA256STAMP:\([a-f0-9]*\).*/\1/p' $@ 2>/dev/null`" != x"`cat $(sort $(filter-out FORCE,$^)) | $(SHA256SUM) | cut -c1-64`" ]
+SHA256STAMP_CHANGED = [ x"`$(SED) -n 's/.*SHA256STAMP:\([a-f0-9]*\).*/\1/p' $@ 2>/dev/null`" != x"`cat $(sort $(filter-out FORCE,$^)) | $(SHA256SUM) | cut -c1-64`" ]
 # Usage: $(call SHA256STAMP,commentprefix,commentpostfix)
 SHA256STAMP = echo "$(1) SHA256STAMP:"`cat $(sort $(filter-out FORCE,$^)) | $(SHA256SUM) | cut -c1-64`"$(2)" >> $@
 endif
 
 # generate-wire.py --page [header|impl] hdrfilename wirename < csv > file
 %_wiregen.h: %_wire.csv $(WIRE_GEN_DEPS)
 	@if $(call SHA256STAMP_CHANGED); then \
-		$(call VERBOSE,"wiregen $@",tools/generate-wire.py --page header $($@_args) $@ `basename $< .csv | sed 's/_exp_/_/'` < $< > $@ && $(call SHA256STAMP,//,)); \
+		$(call VERBOSE,"wiregen $@",tools/generate-wire.py --page header $($@_args) $@ `basename $< .csv | $(SED) 's/_exp_/_/'` < $< > $@ && $(call SHA256STAMP,//,)); \
 	fi
 
 %_wiregen.c: %_wire.csv $(WIRE_GEN_DEPS)
 	@if $(call SHA256STAMP_CHANGED); then \
-		$(call VERBOSE,"wiregen $@",tools/generate-wire.py --page impl $($@_args) ${@:.c=.h} `basename $< .csv | sed 's/_exp_/_/'` < $< > $@ && $(call SHA256STAMP,//,)); \
+		$(call VERBOSE,"wiregen $@",tools/generate-wire.py --page impl $($@_args) ${@:.c=.h} `basename $< .csv | $(SED) 's/_exp_/_/'` < $< > $@ && $(call SHA256STAMP,//,)); \
 	fi
 
 %_printgen.h: %_wire.csv $(WIRE_GEN_DEPS)
 	@if $(call SHA256STAMP_CHANGED); then \
-		$(call VERBOSE,"printgen $@",tools/generate-wire.py -s -P --page header $($@_args) $@ `basename $< .csv | sed 's/_exp_/_/'` < $< > $@ && $(call SHA256STAMP,//,)); \
+		$(call VERBOSE,"printgen $@",tools/generate-wire.py -s -P --page header $($@_args) $@ `basename $< .csv | $(SED) 's/_exp_/_/'` < $< > $@ && $(call SHA256STAMP,//,)); \
 	fi
 
 %_printgen.c: %_wire.csv $(WIRE_GEN_DEPS)
 	@if $(call SHA256STAMP_CHANGED); then \
-		$(call VERBOSE,"printgen $@",tools/generate-wire.py -s -P --page impl $($@_args) ${@:.c=.h} `basename $< .csv | sed 's/_exp_/_/'` < $< > $@ && $(call SHA256STAMP,//,)); \
+		$(call VERBOSE,"printgen $@",tools/generate-wire.py -s -P --page impl $($@_args) ${@:.c=.h} `basename $< .csv | $(SED) 's/_exp_/_/'` < $< > $@ && $(call SHA256STAMP,//,)); \
 	fi
 
 RUST_PROFILE ?= debug
@@ -411,7 +411,7 @@ ALL_TEST_GEN += $(GRPC_GEN)
 $(GRPC_GEN) &: cln-grpc/proto/node.proto cln-grpc/proto/primitives.proto
 	$(PYTHON) -m grpc_tools.protoc -I cln-grpc/proto cln-grpc/proto/node.proto --python_out=$(GRPC_PATH)/ --grpc_python_out=$(GRPC_PATH)/ --experimental_allow_proto3_optional
 	$(PYTHON) -m grpc_tools.protoc -I cln-grpc/proto cln-grpc/proto/primitives.proto --python_out=$(GRPC_PATH)/ --experimental_allow_proto3_optional
-	find $(GRPC_DIR)/ -type f -name "*.py" -print0 | xargs -0 sed -i'.bak' -e 's/^import \(.*\)_pb2 as .*__pb2/from pyln.grpc import \1_pb2 as \1__pb2/g'
+	find $(GRPC_DIR)/ -type f -name "*.py" -print0 | xargs -0 $(SED) -i'.bak' -e 's/^import \(.*\)_pb2 as .*__pb2/from pyln.grpc import \1_pb2 as \1__pb2/g'
 	find $(GRPC_DIR)/ -type f -name "*.py.bak" -print0 | xargs -0 rm -f
 
 # We make pretty much everything depend on these.
@@ -444,7 +444,7 @@ mkdocs.yml: $(MANPAGES:=.md)
 	@$(call VERBOSE, "genidx $@", \
 	  find doc -maxdepth 1 -name '*\.[0-9]\.md' | \
 	  cut -b 5- | LC_ALL=C sort | \
-	  sed 's/\(.*\)\.\(.*\).*\.md/- "\1": "\1.\2.md"/' | \
+	  $(SED) 's/\(.*\)\.\(.*\).*\.md/- "\1": "\1.\2.md"/' | \
 	  $(PYTHON) devtools/blockreplace.py mkdocs.yml manpages --language=yml --indent "          " \
 	)
 
@@ -559,7 +559,7 @@ check-python-flake8:
 	@# E731 do not assign a lambda expression, use a def
 	@# W503: line break before binary operator
 	@# E741: ambiguous variable name
-	@uv run flake8 --ignore=E501,E731,E741,W503,F541,E275 --exclude $(shell echo ${PYTHON_GENERATED} | sed 's/ \+/,/g') ${PYSRC}
+	@uv run flake8 --ignore=E501,E731,E741,W503,F541,E275 --exclude $(shell echo ${PYTHON_GENERATED} | $(SED) 's/ \+/,/g') ${PYSRC}
 
 check-pytest-pyln-proto:
 	PATH=$(PYLN_PATH) PYTHONPATH=$(MY_CHECK_PYTHONPATH) uv run $(PYTEST) contrib/pyln-proto/tests/
@@ -717,7 +717,7 @@ $(ALL_TEST_PROGRAMS:=.o): $(ALL_GEN_SOURCES)
 
 update-ccan:
 	mv ccan ccan.old
-	DIR=$$(pwd)/ccan; cd ../ccan && ./tools/create-ccan-tree -a $$DIR `cd $$DIR.old/ccan && find * -name _info | sed s,/_info,, | $(SORT)` $(CCAN_NEW)
+	DIR=$$(pwd)/ccan; cd ../ccan && ./tools/create-ccan-tree -a $$DIR `cd $$DIR.old/ccan && find * -name _info | $(SED) s,/_info,, | $(SORT)` $(CCAN_NEW)
 	mkdir -p ccan/tools/configurator
 	cp ../ccan/tools/configurator/configurator.c ../ccan/doc/configurator.1 ccan/tools/configurator/
 	$(MAKE) ccan/config.h
@@ -772,8 +772,8 @@ update-pyln-versions: $(PYLNS:%=update-pyln-version-%)
 update-pyln-version-%:
 	@if [ -z "$(NEW_VERSION)" ]; then echo "Set NEW_VERSION!" >&2; exit 1; fi
 	@echo "Updating contrib/pyln-$* to $(NEW_VERSION)"
-	@sed -i.bak 's/^version = .*/version = "$(NEW_VERSION)"/' contrib/pyln-$*/pyproject.toml && rm contrib/pyln-$*/pyproject.toml.bak
-	@sed -i.bak 's/^__version__ = .*/__version__ = "$(NEW_VERSION)"/' contrib/pyln-$*/pyln/$*/__init__.py && rm contrib/pyln-$*/pyln/$*/__init__.py.bak
+	@$(SED) -i.bak 's/^version = .*/version = "$(NEW_VERSION)"/' contrib/pyln-$*/pyproject.toml && rm contrib/pyln-$*/pyproject.toml.bak
+	@$(SED) -i.bak 's/^__version__ = .*/__version__ = "$(NEW_VERSION)"/' contrib/pyln-$*/pyln/$*/__init__.py && rm contrib/pyln-$*/pyln/$*/__init__.py.bak
 
 pyln-release:  $(PYLNS:%=pyln-release-%)
 
@@ -805,7 +805,7 @@ update-lock:
 update-reckless-version:
 	@if [ -z "$(NEW_VERSION)" ]; then echo "Set NEW_VERSION!" >&2; exit 1; fi
 	@echo "Updating tools/reckless to $(NEW_VERSION)"
-	@sed -i.bak "s/__VERSION__ = '.*'/__VERSION__ = '$(NEW_VERSION)'/" tools/reckless && rm tools/reckless.bak
+	@$(SED) -i.bak "s/__VERSION__ = '.*'/__VERSION__ = '$(NEW_VERSION)'/" tools/reckless && rm tools/reckless.bak
 
 update-dot-version:
 	@if [ -z "$(NEW_VERSION)" ]; then echo "Set NEW_VERSION!" >&2; exit 1; fi
@@ -816,7 +816,7 @@ update-mocks: $(ALL_TEST_PROGRAMS:%=update-mocks/%.c)
 $(ALL_TEST_PROGRAMS:%=update-mocks/%.c): $(ALL_GEN_HEADERS) $(EXTERNAL_LIBS) libccan.a ccan/ccan/cdump/tools/cdump-enumstr config.vars
 
 update-mocks/%: % $(ALL_GEN_HEADERS) $(ALL_GEN_SOURCES)
-	@MAKE=$(MAKE) tools/update-mocks.sh "$*" $(SUPPRESS_OUTPUT)
+	@MAKE=$(MAKE) SED=$(SED) tools/update-mocks.sh "$*" $(SUPPRESS_OUTPUT)
 
 unittest/%: % bolt-precheck
 	BOLTDIR=$(LOCAL_BOLTDIR) $(VG) $(VG_TEST_ARGS) $* > /dev/null

diff --git a/configure b/configure
@@ -82,6 +82,24 @@ default_python()
     done
 }
 
+# We want GNU sed, which, among other things, recognizes '\t'.
+# We don't want to get confused with some random program called gsed,
+# so we actually test.
+default_sed()
+{
+    SED_BINS="gsed sed"
+    for s in $SED_BINS; do
+        if [ "$(which $s)" != "" ] ; then
+            if [ "$(printf x | $s 's/x/\t/')" = "	" ]; then
+		echo "$s"
+                return
+            fi
+        fi
+    done
+    echo "No valid sed found?" >&2
+    exit 1
+}
+
 # Takes PYTHON var
 default_pytest()
 {
@@ -184,6 +202,7 @@ set_defaults()
     fi
     echo CSANFLAGS = $CSANFLAGS
     PYTHON=${PYTHON-$(default_python)}
+    SED=${SED-$(default_sed)}
     PYTEST=${PYTEST-$(default_pytest $PYTHON)}
     COPTFLAGS=${COPTFLAGS-$(default_coptflags "$DEBUGBUILD")}
     CONFIGURATOR_CC=${CONFIGURATOR_CC-$CC}
@@ -212,6 +231,7 @@ usage()
     echo "    To override compile line for configurator itself"
     usage_with_default "PYTEST" "$PYTEST"
     usage_with_default "VALGRIND" "$VALGRIND"
+    usage_with_default "SED" "$SED"
 
     echo "Options include:"
     usage_with_default "--prefix=" "$PREFIX"
@@ -554,6 +574,7 @@ add_var SHA256SUM "$SHA256SUM"
 add_var FUZZING "$FUZZING"
 add_var RUST "$RUST"
 add_var PYTHON "$PYTHON"
+add_var SED "$SED"
 
 # Hack to avoid sha256 name clash with libwally: will be fixed when that
 # becomes a standalone shared lib.

diff --git a/contrib/plugins/cowsay.sh b/contrib/plugins/cowsay.sh
@@ -1,5 +1,8 @@
 #! /bin/sh
 
+# Set sed using best effort, for MacOS.
+if which gsed > /dev/null; then SED="gsed"; else SED="sed"; fi
+
 maybe_cowsay()
 {
     cowsay || cat <<EOF
@@ -17,24 +20,24 @@ EOF
 # Eg. {"jsonrpc":"2.0","id":2,"method":"getmanifest","params":{}}\n\n
 read -r JSON
 read -r _
-id=$(echo "$JSON" | sed 's/.*"id" *: *\([^,]*\),.*/\1/')
+id=$(echo "$JSON" | $SED 's/.*"id" *: *\([^,]*\),.*/\1/')
 
 echo '{"jsonrpc":"2.0","id":'"$id"',"result":{"dynamic":true,"options":[],"rpcmethods":[{"name":"cowsay","usage":"<string>","description":"Have a cow, man!"}]}}'
 
 # Eg. {"jsonrpc":"2.0","id":5,"method":"init","params":{"options":{},"configuration":{"lightning-dir":"/home/rusty/.lightning","rpc-file":"lightning-rpc","startup":false}}}\n\n
 read -r JSON
 read -r _
-id=$(echo "$JSON" | sed 's/.*"id" *: *\([^,]*\),.*/\1/')
+id=$(echo "$JSON" | $SED 's/.*"id" *: *\([^,]*\),.*/\1/')
 
 echo '{"jsonrpc":"2.0","id":'"$id"',"result":{}}'
 
 # eg. { "jsonrpc" : "2.0", "method" : "cowsay", "id" : 6, "params" :[ "hello"] }
 while read -r JSON; do
     read -r _
-    id=$(echo "$JSON" | sed 's/.*"id" *: *\([^,]*\),.*/\1/')
-    params=$(echo "$JSON" | sed 's/.*"params" *: *//' | tr -d '[{}]"')
+    id=$(echo "$JSON" | $SED 's/.*"id" *: *\([^,]*\),.*/\1/')
+    params=$(echo "$JSON" | $SED 's/.*"params" *: *//' | tr -d '[{}]"')
     echo '{"jsonrpc":"2.0","id":'"$id"',"result":{"format-hint":"simple","cowsay":"'
     # FIXME: lightning-cli does not unescape \\, so we replace with an L.
-    printf "%s" "$params" | maybe_cowsay | sed 's/\\/L/g' | sed ':a;N;$!ba;s/\n/\\n/g' | tr '\012' '"'
+    printf "%s" "$params" | maybe_cowsay | $SED 's/\\/L/g' | $SED ':a;N;$!ba;s/\n/\\n/g' | tr '\012' '"'
     echo '}}'
 done
diff --git a/doc/Makefile b/doc/Makefile
@@ -226,9 +226,9 @@ doc/.doc_version: version_gen.h
 	@if cmp $@.new $@ >/dev/null 2>&1; then rm -f $@.new; else mv $@.new $@; $(ECHO) Documentation version updated to `cat doc/.doc_version`; fi
 
 $(PREFIXED_MANPAGES): doc/lightning-%: doc/%.md tools/md2man.sh doc/.doc_version
-	@VERSION=`cat doc/.doc_version` tools/md2man.sh $(LOWDOWN) $<
+	@VERSION=`cat doc/.doc_version` SED=$(SED) tools/md2man.sh $(LOWDOWN) $<
 $(NON_PREFIXED_MANPAGES): doc/%: doc/%.md tools/md2man.sh doc/.doc_version
-	@VERSION=`cat doc/.doc_version` tools/md2man.sh $(LOWDOWN) $<
+	@VERSION=`cat doc/.doc_version` SED=$(SED) tools/md2man.sh $(LOWDOWN) $<
 
 doc/protocol-%.svg: test/test_protocol
 	test/test_protocol --svg < test/commits/$*.script > $@
@@ -263,8 +263,8 @@ check: check-manpages
 
 # This needs plugins, too.
 check-manpages: all-programs check-config-docs default-targets
-	@tools/check-manpage.sh cli/lightning-cli doc/lightning-cli.1.md
-	@tools/check-manpage.sh "lightningd/lightningd --lightning-dir=/tmp/" doc/lightningd-config.5.md
+	@SED=$(SED) tools/check-manpage.sh cli/lightning-cli doc/lightning-cli.1.md
+	@SED=$(SED) tools/check-manpage.sh "lightningd/lightningd --lightning-dir=/tmp/" doc/lightningd-config.5.md
 	@awk '/^$$/ { do { getline } while ($$0 ~ /^( {4,}|\t)/) } /^\s*```/ { do { getline } while ($$0 !~ /^\s*```/) } /^([^`_\\]|`([^`\\]|\\.)*`|\b_|_\b|\\.)*\B_\B/ { print "" ; print "Unescaped underscore at " FILENAME ":" NR ":" ; print ; ret = 1 } ENDFILE { NR = 0 } END { exit ret }' doc/*.[0-9].md
 
 # Makes sure that fields mentioned in schema are in man page, and vice versa.
@@ -281,7 +281,7 @@ doc/index.rst: $(MARKDOWNPAGES_WITH_EXT) $(NON_PREFIXED_MARKDOWNPAGES_WITH_EXT)
 	  for m in $(MARKDOWNPAGES_WITH_EXT) $(NON_PREFIXED_MARKDOWNPAGES_WITH_EXT); do \
 	    base=$$(basename "$$m"); \
 	    echo "$$base" | \
-	      sed -E 's/^(.*)\.([0-9]+)\.md$$/\1 <\1.\2.md>/; t; s/^(.*)\.md$$/\1 <\1.md>/'; \
+	      $(SED) -E 's/^(.*)\.([0-9]+)\.md$$/\1 <\1.\2.md>/; t; s/^(.*)\.md$$/\1 <\1.md>/'; \
 	  done | \
 	  LC_ALL=C sort | \
 	  $(PYTHON) devtools/blockreplace.py doc/index.rst manpages --language=rst --indent "   " \

diff --git a/plugins/Makefile b/plugins/Makefile
@@ -277,9 +277,9 @@ plugins/sql-schema_gen.h: $(SQL_SCHEMA_PARTS)
 		SEP=""; \
 		echo "\"{"; \
 		for l in $(SQL_LISTRPCS); do \
-			echo "$$SEP\"$$l\":{\"properties\":$$(cat plugins/sql-schema_$${l}_gen.h)}" | sed s/\"/\\\"/g; \
+			echo "$$SEP\"$$l\":{\"properties\":$$(cat plugins/sql-schema_$${l}_gen.h)}" | $(SED) s/\"/\\\"/g; \
 			SEP=","; \
-		done | sed "s/\\\"/\\\\\"/g"; \
+		done | $(SED) "s/\\\"/\\\\\"/g"; \
 		echo "}\"") | tr -d " \n" > $@ \
 	)
 

diff --git a/tools/check-manpage.sh b/tools/check-manpage.sh
@@ -10,7 +10,7 @@ get_cmd_opts()
 {
     # Trim out -- after first one: ensure width sufficient to give desc
     # on same line, and ignore single-letter prefix e.g. -X|--ex
-    COLUMNS=1000 $1 --help | sed -n 's/^\(-.|\)\?\(--[^	]*\)\(  \|	\).*/\2/p' | while IFS=$'\n' read -r opt; do
+    COLUMNS=1000 $1 --help | $SED -n 's/^\(-.|\)\?\(--[^	]*\)\(  \|	\).*/\2/p' | while IFS=$'\n' read -r opt; do
 	case "$opt" in
 	    # We don't document dev options.
 	    --dev-*)
@@ -46,7 +46,7 @@ if [ -z "$CMD_OPTNAMES" ]; then
 fi
 
 # Now, gather (long) opt names from man page, make sure they match.
-MAN_OPTNAMES=$(grep -vi 'deprecated in' "$2" | sed -E -n 's,^\* \*\*(--)?([^*/]*)\*\*(/\*\*-.\*\*)?(=?).*,\2\4,p'| sort)
+MAN_OPTNAMES=$(grep -vi 'deprecated in' "$2" | $SED -E -n 's,^\* \*\*(--)?([^*/]*)\*\*(/\*\*-.\*\*)?(=?).*,\2\4,p'| sort)
 
 if [ "$CMD_OPTNAMES" != "$MAN_OPTNAMES" ]; then
     echo "diff of command names vs manpage names":

diff --git a/tools/md2man.sh b/tools/md2man.sh
@@ -29,14 +29,14 @@ TITLELINE="$(head -n1 "$SOURCE")"
 # Replace lightning-cli with $ lightning-cli but do not replace it if it is preceded with (
 # because it is used in the examples to run it in the shell, eg. $(lightning-cli listpeerchannels)
 # shellcheck disable=SC2016 # These are not variables, shellcheck!
-SOURCE=$(tail -n +3 "$SOURCE" | sed -E '
+SOURCE=$(tail -n +3 "$SOURCE" | $SED -E '
     :a;N;$!ba;
     s#(\(lightning-cli)#\x1#ig;
     s#lightning-cli#$ lightning-cli#g;
     s#\x1#(lightning-cli#g;
 ' |
 # Lowdown requires a blank line before every preformatted text block
-sed '
+$SED '
 	/^$/{:0;N;/\n$/b0};s/^[[:blank:]]*```/\n\0/;
 	/\n[[:blank:]]*```/{:1;n;/^[[:blank:]]*```/!b1}
 ')

diff --git a/tools/mockup.sh b/tools/mockup.sh
@@ -73,5 +73,5 @@ for SYMBOL; do
 
     echo "/* Generated stub for $SYMBOL */"
 
-    tail -n "+${LINE}" < "$FILE" | head -n "$NUM" | sed 's/^extern *//' | sed 's/PRINTF_FMT([^)]*)//' | sed 's/NON_NULL_ARGS([^)]*)//' | sed 's/NO_NULL_ARGS//g' | sed 's/NORETURN//g' | sed 's/RETURNS_NONNULL//g' | sed 's/LAST_ARG_NULL//g' | sed 's/WARN_UNUSED_RESULT//g' | sed 's/,/ UNNEEDED,/g' | sed 's/\([a-z0-9A-Z*_]* [a-z0-9A-Z*_]*\));/\1 UNNEEDED);/' | sed "s/;\$/$STUB/" | sed 's/[[:space:]]*$//'
+    tail -n "+${LINE}" < "$FILE" | head -n "$NUM" | $SED 's/^extern *//' | $SED 's/PRINTF_FMT([^)]*)//' | $SED 's/NON_NULL_ARGS([^)]*)//' | $SED 's/NO_NULL_ARGS//g' | $SED 's/NORETURN//g' | $SED 's/RETURNS_NONNULL//g' | $SED 's/LAST_ARG_NULL//g' | $SED 's/WARN_UNUSED_RESULT//g' | $SED 's/,/ UNNEEDED,/g' | $SED 's/\([a-z0-9A-Z*_]* [a-z0-9A-Z*_]*\));/\1 UNNEEDED);/' | $SED "s/;\$/$STUB/" | $SED 's/[[:space:]]*$//'
 done