clang

unvendor

06/recipes/4-rebootstrap-using-nix.sh

@@ -0,0 +1,98 @@
+#!/store/2b2-busybox/bin/ash
+
+set -uex
+
+export PATH='/store/2b2-busybox/bin'
+export PATH="$PATH:/store/3a-pkg-config/bin"
+export PATH="$PATH:/store/3a-sqlite/bin"
+export PATH="$PATH:/store/3b-nix/bin"
+
+export SHELL='/store/2b2-busybox/bin/ash'
+
+export PKG_CONFIG_PATH=''
+export PKG_CONFIG_PATH="$PKG_CONFIG_PATH:/store/3a-sqlite/lib/pkgconfig"
+export PKG_CONFIG_PATH="$PKG_CONFIG_PATH:/store/3a-curl/lib/pkgconfig"
+export PKG_CONFIG_PATH="$PKG_CONFIG_PATH:/store/3a-editline/lib/pkgconfig"
+export PKG_CONFIG_PATH="$PKG_CONFIG_PATH:/store/3a-seccomp/lib/pkgconfig"
+export PKG_CONFIG_PATH="$PKG_CONFIG_PATH:/store/3a-libarchive/lib/pkgconfig"
+export PKG_CONFIG_PATH="$PKG_CONFIG_PATH:/store/3a-libsodium/lib/pkgconfig"
+export PKG_CONFIG_PATH="$PKG_CONFIG_PATH:/store/3a-lowdown/lib/pkgconfig"
+LIBDIRS=''
+LIBDIRS="$LIBDIRS:$(pkg-config --variable=libdir sqlite3)"
+LIBDIRS="$LIBDIRS:$(pkg-config --variable=libdir libcurl)"
+LIBDIRS="$LIBDIRS:$(pkg-config --variable=libdir libeditline)"
+LIBDIRS="$LIBDIRS:$(pkg-config --variable=libdir libseccomp)"
+LIBDIRS="$LIBDIRS:$(pkg-config --variable=libdir libarchive)"
+LIBDIRS="$LIBDIRS:$(pkg-config --variable=libdir libsodium)"
+LIBDIRS="$LIBDIRS:$(pkg-config --variable=libdir lowdown)"
+LIBDIRS="$LIBDIRS:/store/3a-boost/lib"
+LIBDIRS="$LIBDIRS:/store/2b1-clang/lib"
+export LD_LIBRARY_PATH=$LIBDIRS
+
+mkdir -p /tmp/4-rebootstrap-using-nix; cd /tmp/4-rebootstrap-using-nix
+
+echo "### $0: preparing stuff for nix to work..."
+mkdir -p /dev/pts
+mount -t devpts devpts /dev/pts
+ln -s /dev/pts/ptmx /dev/ptmx
+
+echo "### $0: faking lots of stuff for nix to work..."
+mkdir shelter
+export HOME=/tmp/4-rebootstrap-using-nix/shelter
+export USER=notauser
+echo 'oh come on' >/dev/urandom
+
+echo "### $0: fixing up paths to shell..."
+cp -a --reflink=auto /using-nix /default.nix /recipes ./
+sed -i 's|/bin/sh|/store/3b-busybox-static/bin/ash|' using-nix/1-stage1.nix
+
+echo "### $0: pointing to local downloads..."
+sed -i 's| url =| #remote_url =|' using-nix/*.nix
+sed -i 's|# local = \(.*\);|url = "file://\1";|' using-nix/*.nix
+
+if [ -e /prev/nix/store ] && [ -e /prev/nix-db.tar ]; then
+	echo "### $0: restoring nix store & db from previous build..."
+	mkdir -p /nix
+	cp -a --reflink=auto /prev/nix/store /nix
+	tar -xf /prev/nix-db.tar -C /
+	sqlite3 /nix/var/nix/db/db.sqlite \
+		< /nix/var/nix/db/db.sqlite.dump
+	rm /nix/var/nix/db/db.sqlite.dump
+fi
+
+echo "### $0: writing a 0.nix that simply injects what we've built..."
+# Makefile bootstrap injects it as /stage/protosrc, regular --- as /protosrc
+[ -e /protosrc ] && PROTOSRC="/protosrc" || PROTOSRC=/stage/protosrc
+echo "{ tinycc = /store/3b-tinycc-static/bin/tcc; protosrc = $PROTOSRC; }" \
+	> using-nix/0.nix
+
+echo "### $0: rebuilding everything using nix..."
+nix-build \
+	--extra-experimental-features ca-derivations \
+	--option build-users-group '' \
+	--option compress-build-log false \
+	--no-substitute \
+	--cores $NPROC \
+	--keep-failed \
+	-vvv \
+	default.nix
+rm -f /dev/urandom
+rm /dev/ptmx
+umount /dev/pts
+umount /dev/pts || true
+rm -r /dev/pts
+rm -r shelter
+rm -rf /build
+
+# this one is special wrt how the results are saved, see Makefile/USE_NIX_CACHE
+echo "### $0: exporting resulting /nix/store (reproducible)..."
+mkdir -p /store/4-rebootstrap-using-nix/nix
+cp -a --reflink=auto /nix/store /store/4-rebootstrap-using-nix/nix/
+
+echo "### $0: exporting /nix/var/nix/db to restore it (non-reproducible)..."
+cp /nix/var/nix/db/db.sqlite db.sqlite
+sqlite3 db.sqlite 'UPDATE ValidPaths SET registrationTime = 1;'
+sqlite3 db.sqlite .dump > /nix/var/nix/db/db.sqlite.dump
+tar --exclude nix/var/nix/db/db.sqlite \
+	-cf /store/4-rebootstrap-using-nix/nix-db.tar /nix/var/nix/db
+rm /nix/var/nix/db/db.sqlite.dump