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# tinyrd — the rawnix initramfs
# https://rawnix.org
#
# tinyrd links a static libcryptsetup and libdevmapper. The port builds
# both privately, never installing them system-wide, and passes their
# prefix:
#
# make STATIC_PREFIX=/path/to/private/prefix image
#
# The link line comes from pkg-config, which needs PKG_CONFIG_PATH to
# point into that prefix; the port exports it already, so passing LIBS
# in is equally good and is what it does:
#
# make STATIC_PREFIX=$_p LIBS="$(pkg-config --static --libs libcryptsetup)"
#
# "image" writes tinyrd.img by running the binary it just built; that
# image is what gets packaged. "all" stops at the binary.
CC ?= cc
PKG_CONFIG ?= pkg-config
# _GNU_SOURCE is defined by tinyrd.c itself; defining it here too only
# earns a -Wmacro-redefined warning.
CFLAGS += -std=c99 -Wall -Wextra -Os
STATIC_PREFIX ?= /usr
CPPFLAGS += -I$(STATIC_PREFIX)/include
LDFLAGS += -L$(STATIC_PREFIX)/lib
# ?= so the port can hand the line in ready-made. The default is a
# recursive variable on purpose: it runs pkg-config only if it is
# actually used, and only after STATIC_PREFIX has its final value.
LIBS ?= $(shell PKG_CONFIG_PATH=$(STATIC_PREFIX)/lib/pkgconfig \
$(PKG_CONFIG) --static --libs libcryptsetup)
PREFIX ?= /usr
MANDIR = $(PREFIX)/share/man
BOOTDIR = /boot
all: tinyrd
# static is mandatory: /init runs before anything holding a shared
# library is mounted, and tinyrd refuses to build an image from a
# dynamic binary.
tinyrd: tinyrd.c
@test -n "$(strip $(LIBS))" || { \
echo "tinyrd: no libcryptsetup: set STATIC_PREFIX, or pass LIBS=" >&2; \
exit 1; }
$(CC) $(CFLAGS) $(CPPFLAGS) -static -o $@ $< $(LDFLAGS) $(LIBS)
image: tinyrd
./tinyrd -o tinyrd.img
install: image
install -Dm644 tinyrd.img $(DESTDIR)$(BOOTDIR)/tinyrd.img
install -Dm644 tinyrd.8 $(DESTDIR)$(MANDIR)/man8/tinyrd.8
uninstall:
rm -f $(DESTDIR)$(BOOTDIR)/tinyrd.img
rm -f $(DESTDIR)$(MANDIR)/man8/tinyrd.8
lint:
mandoc -Tlint tinyrd.8
clean:
rm -f tinyrd tinyrd.img
.PHONY: all image install uninstall lint clean
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