Merge pull request 'feat(ci): shell-customization' (#32) from lbailly/liminix:shell-customization into main

Reviewed-on: DGNum/liminix#32

.forgejo/workflows/build.yaml

@@ -38,3 +38,13 @@ jobs:
         run: |
           # Enter the shell
           nix-build ci.nix -A wlan
+
+  test_shell_customization:
+    runs-on: nix
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Build VM QEMU MIPS
+        run: |
+          # Enter the shell
+          nix-build ci.nix -A custom-shell

modules/base.nix

@@ -4,11 +4,13 @@
 
 { lib, pkgs, config, ...}:
 let
-  inherit (lib) mkEnableOption mkOption types isDerivation hasAttr ;
+  inherit (lib) mkEnableOption mkOption types isDerivation hasAttr concatStringsSep mapAttrsToList;
   inherit (pkgs.pseudofile) dir symlink;
   inherit (pkgs.liminix.networking) address interface;
   inherit (pkgs.liminix.services) bundle;
 
+  # TODO: escape shell argument.
+  exportVar = name: value: "export ${name}=\"${value}\"";
   type_service = pkgs.liminix.lib.types.service;
 
 in {
@@ -22,6 +24,24 @@ in {
           /run/current-system, we just add the paths in /etc/profile
         '';
       };
+
+      environmentVariables = mkOption {
+        type = types.attrsOf types.str;
+        description = ''
+          Attribute set of environment variables to make available
+          in a login shell.
+
+          The value is assumed to be escaped and the name to be valid.
+        '';
+      };
+
+      prompt = mkOption {
+        type = types.str;
+        default = "$(whoami)@$(hostname) # ";
+        description = ''
+          Prompt string (PS1) for the shell.
+        '';
+      };
     };
     services = mkOption {
       type = types.attrsOf type_service;
@@ -111,6 +131,8 @@ in {
 
     defaultProfile.packages = with pkgs;
       [ s6 s6-init-bin execline s6-linux-init s6-rc ];
+    # Set the useful PS1 prompt by default.
+    defaultProfile.environmentVariables.PS1 = lib.mkDefault config.defaultProfile.prompt;
 
     boot.commandLine = [
       "panic=10 oops=panic init=/bin/init loglevel=8"
@@ -181,9 +203,10 @@ in {
       etc = let
         profile = symlink
           (pkgs.writeScript ".profile" ''
-           PATH=${lib.makeBinPath config.defaultProfile.packages}:/bin
+            PATH=${lib.makeBinPath config.defaultProfile.packages}:/bin
             export PATH
-            '');
+            ${concatStringsSep "\n" (mapAttrsToList exportVar config.defaultProfile.environmentVariables)}
+          '');
       in dir {
         inherit profile;
         ashrc = profile;

modules/hostname.nix

@@ -1,7 +1,6 @@
 { lib, pkgs, config, ...}:
 let
   inherit (lib) mkOption types;
-  inherit (pkgs.liminix.services) oneshot;
 in {
   options = {
     hostname = mkOption {
@@ -12,12 +11,21 @@ in {
       default = "liminix";
       type = types.nonEmptyStr;
     };
-  };
+    hostname-script = mkOption {
-  config = {
+      description = ''
-    services.hostname = oneshot {
+        Script that outputs the system hostname on stdin.
-      name = "hostname-${builtins.substring 0 12 (builtins.hashString "sha256" config.hostname)}";
+      '';
-      up = "echo ${config.hostname} > /proc/sys/kernel/hostname";
+      default = pkgs.writeScript "hostname-gen" ''
-      down = "true";
+        #!/bin/sh
+        echo ${config.hostname}
+      '';
+      defaultText = ''
+        pkgs.writeScript "hostname-gen" '''
+        #!/bin/sh
+        echo ''${config.hostname}
+      '''
+      '';
+      type = types.package;
     };
   };
 }

modules/s6/default.nix

@@ -1,4 +1,4 @@
-{ config, pkgs, lib, ... }:
+{ config, pkgs, ... }:
 let
   inherit (pkgs)
     execline
@@ -30,9 +30,9 @@ let
     installPhase = ''
       mkdir $out
       cp -r $src $out/scripts
+      substituteInPlace $out/scripts/rc.init \
+        --replace-fail 'config.hostname' "${config.hostname-script}"
       chmod -R +w $out
-      substituteInPlace $out/scripts/{rc.init,rc.shutdown} \
-        --replace-warn 'pkgs.seedrng' "${lib.getExe' pkgs.seedrng "seedrng"}"
     '';
   };
   service = dir  {

modules/s6/scripts/rc.init

@@ -32,12 +32,11 @@ else
     mkdir -m 0751 -p /run/services/state
 fi
 
-pkgs.seedrng
-
 ### If your services are managed by s6-rc:
 ### (replace /run/service with your scandir)
 s6-rc-init -d -c /etc/s6-rc/compiled /run/service
 
+config.hostname > /proc/sys/kernel/hostname
 
 ### 2. Starting the wanted set of services
 ### This is also called every time you change runlevels with telinit.

modules/s6/scripts/rc.shutdown

@@ -4,7 +4,6 @@
 ### Things to do before hardware halt/reboot/poweroff.
 ### Ideally, it should be a single call to the service manager,
 ### telling it to bring all the services down.
-pkgs.seedrng
 
 ### If your s6-linux-init-maker invocation was made with the -1
 ### option, messages from rc.shutdown will appear on /dev/console

pkgs/default.nix

@@ -99,7 +99,6 @@ in {
   run-liminix-vm = callPackage ./run-liminix-vm {};
   s6-init-bin =  callPackage ./s6-init-bin {};
   s6-rc-database = callPackage ./s6-rc-database {};
-  seedrng = callPackage ./seedrng {};
 
   # schnapps is written by Turris and provides a high-level interface
   # to btrfs snapshots. It may be useful on the Turris Omnia to

pkgs/seedrng/COPYING

@@ -1,712 +0,0 @@
-This project is licensed under any one of:
-
-- GPL-2.0
-- Apache-2.0
-- MIT
-- BSD-1-Clause
-- CC0-1.0
-
-Choose which one works best for you. They are reproduced below.
-
--------------------------------------------------------------------------------
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pkgs/seedrng/Makefile

@@ -1,18 +0,0 @@
-PREFIX ?= /usr
-DESTDIR ?=
-SBINDIR ?= $(PREFIX)/sbin
-LOCALSTATEDIR ?= /var/lib
-CFLAGS ?= -O2 -pipe
-
-CFLAGS += -Wall -Wextra -pedantic
-CFLAGS += -DLOCALSTATEDIR="\"$(LOCALSTATEDIR)\""
-
-seedrng: seedrng.c
-
-install: seedrng
-	install -v -d "$(DESTDIR)$(SBINDIR)" && install -v -m 0755 seedrng "$(DESTDIR)$(SBINDIR)/seedrng"
-
-clean:
-	rm -f seedrng
-
-.PHONY: clean

pkgs/seedrng/README.md

@@ -1,72 +0,0 @@
-## SeedRNG — `seedrng(8)`
-##### by [Jason A. Donenfeld](mailto:Jason@zx2c4.com)
-
-SeedRNG is a simple program made for seeding the Linux kernel random number
-generator from seed files. The program takes no arguments, must be run as root,
-and always attempts to do something useful.
-
-This program is useful in light of the fact that the Linux kernel RNG cannot be
-initialized from shell scripts, and new seeds cannot be safely generated from
-boot time shell scripts either.
-
-It should be run once at init time and once at shutdown time. It can be run at
-other times without detriment as well. Whenever it is run, it writes existing
-seed files into the RNG pool, and then creates a new seed file. If the RNG is
-initialized at the time of creating a new seed file, then that new seed file is
-marked as "creditable", which means it can be used to initialize the RNG.
-Otherwise, it is marked as "non-creditable", in which case it is still used to
-seed the RNG's pool, but will not initialize the RNG.
-
-In order to ensure that entropy only ever stays the same or increases from one
-seed file to the next, old seed values are hashed together with new seed values
-when writing new seed files:
-
-```
-new_seed = new_seed[:-32] || HASH(fixed_prefix || real_time || boot_time || old_seed_len || old_seed || new_seed_len || new_seed)
-```
-
-The seed is stored in `LOCALSTATEDIR/seedrng/`, which can be adjusted at
-compile time. If the `SEEDRNG_SKIP_CREDIT` environment variable is set to `1`,
-`true`, `yes`, or `y`, then seeds never credit the RNG, even if the seed file
-is creditable.
-
-Being a single C file, `seedrng.c`, SeedRNG is meant to be copy and pasted
-verbatim into various minimal init system projects and tweaked as needed.
-**Please do not package this repo as a standalone program**: it is intended as
-utility code meant to be imported into existing projects instead.
-
-### Building & Installing
-
-```
-$ make
-$ sudo make install
-```
-
-In addition to the usual compiler environment variables (`CFLAGS`, etc), the
-following environment variable is respected during compilation:
-
-  * `LOCALSTATEDIR`        default: `/var/lib`
-
-The following environment variables are respected during installation:
-
-  * `PREFIX`               default: `/usr`
-  * `DESTDIR`              default:
-  * `SBINDIR`              default: `$(PREFIX)/sbin`
-
-### Usage
-
-```
-# seedrng
-```
-
-However, this invocation should generally come from init and shutdown scripts.
-
-### License
-
-This program is licensed under any one of the the following licenses, so that it can be incorporated into other software projects as needed:
-
-    - GPL-2.0
-    - Apache-2.0
-    - MIT
-    - BSD-1-Clause
-    - CC0-1.0

pkgs/seedrng/default.nix

@@ -1,13 +0,0 @@
-{ stdenv }:
-stdenv.mkDerivation {
-  pname = "seedrng";
-  version = "2022.04";
-
-  src = ./.;
-
-  makeFlags = [
-    "PREFIX=${placeholder "out"}"
-    "SBINDIR=${placeholder "out"}/bin"
-    "LOCALSTATEDIR=/persist"
-  ];
-}

pkgs/seedrng/seedrng.c

@@ -1,488 +0,0 @@
-// SPDX-License-Identifier: (GPL-2.0 OR Apache-2.0 OR MIT OR BSD-1-Clause OR CC0-1.0)
-/*
- * Copyright (C) 2022 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
- */
-
-#include <linux/random.h>
-#include <sys/random.h>
-#include <sys/ioctl.h>
-#include <sys/file.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <fcntl.h>
-#include <poll.h>
-#include <unistd.h>
-#include <time.h>
-#include <errno.h>
-#include <endian.h>
-#include <stdbool.h>
-#include <stdint.h>
-#include <string.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-#ifndef LOCALSTATEDIR
-#define LOCALSTATEDIR "/var/lib"
-#endif
-
-#define SEED_DIR LOCALSTATEDIR "/seedrng"
-#define CREDITABLE_SEED "seed.credit"
-#define NON_CREDITABLE_SEED "seed.no-credit"
-
-enum blake2s_lengths {
-	BLAKE2S_BLOCK_LEN = 64,
-	BLAKE2S_HASH_LEN = 32,
-	BLAKE2S_KEY_LEN = 32
-};
-
-enum seedrng_lengths {
-	MAX_SEED_LEN = 512,
-	MIN_SEED_LEN = BLAKE2S_HASH_LEN
-};
-
-struct blake2s_state {
-	uint32_t h[8];
-	uint32_t t[2];
-	uint32_t f[2];
-	uint8_t buf[BLAKE2S_BLOCK_LEN];
-	unsigned int buflen;
-	unsigned int outlen;
-};
-
-#define le32_to_cpup(a) le32toh(*(a))
-#define cpu_to_le32(a) htole32(a)
-#ifndef ARRAY_SIZE
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
-#endif
-#ifndef DIV_ROUND_UP
-#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
-#endif
-
-static inline void cpu_to_le32_array(uint32_t *buf, unsigned int words)
-{
-	while (words--) {
-		*buf = cpu_to_le32(*buf);
-		++buf;
-	}
-}
-
-static inline void le32_to_cpu_array(uint32_t *buf, unsigned int words)
-{
-	while (words--) {
-		*buf = le32_to_cpup(buf);
-		++buf;
-	}
-}
-
-static inline uint32_t ror32(uint32_t word, unsigned int shift)
-{
-	return (word >> (shift & 31)) | (word << ((-shift) & 31));
-}
-
-static const uint32_t blake2s_iv[8] = {
-	0x6A09E667UL, 0xBB67AE85UL, 0x3C6EF372UL, 0xA54FF53AUL,
-	0x510E527FUL, 0x9B05688CUL, 0x1F83D9ABUL, 0x5BE0CD19UL
-};
-
-static const uint8_t blake2s_sigma[10][16] = {
-	{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
-	{ 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 },
-	{ 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 },
-	{ 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 },
-	{ 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 },
-	{ 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 },
-	{ 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 },
-	{ 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 },
-	{ 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 },
-	{ 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0 },
-};
-
-static void blake2s_set_lastblock(struct blake2s_state *state)
-{
-	state->f[0] = -1;
-}
-
-static void blake2s_increment_counter(struct blake2s_state *state, const uint32_t inc)
-{
-	state->t[0] += inc;
-	state->t[1] += (state->t[0] < inc);
-}
-
-static void blake2s_init_param(struct blake2s_state *state, const uint32_t param)
-{
-	int i;
-
-	memset(state, 0, sizeof(*state));
-	for (i = 0; i < 8; ++i)
-		state->h[i] = blake2s_iv[i];
-	state->h[0] ^= param;
-}
-
-static void blake2s_init(struct blake2s_state *state, const size_t outlen)
-{
-	blake2s_init_param(state, 0x01010000 | outlen);
-	state->outlen = outlen;
-}
-
-static void blake2s_compress(struct blake2s_state *state, const uint8_t *block, size_t nblocks, const uint32_t inc)
-{
-	uint32_t m[16];
-	uint32_t v[16];
-	int i;
-
-	while (nblocks > 0) {
-		blake2s_increment_counter(state, inc);
-		memcpy(m, block, BLAKE2S_BLOCK_LEN);
-		le32_to_cpu_array(m, ARRAY_SIZE(m));
-		memcpy(v, state->h, 32);
-		v[ 8] = blake2s_iv[0];
-		v[ 9] = blake2s_iv[1];
-		v[10] = blake2s_iv[2];
-		v[11] = blake2s_iv[3];
-		v[12] = blake2s_iv[4] ^ state->t[0];
-		v[13] = blake2s_iv[5] ^ state->t[1];
-		v[14] = blake2s_iv[6] ^ state->f[0];
-		v[15] = blake2s_iv[7] ^ state->f[1];
-
-#define G(r, i, a, b, c, d) do { \
-	a += b + m[blake2s_sigma[r][2 * i + 0]]; \
-	d = ror32(d ^ a, 16); \
-	c += d; \
-	b = ror32(b ^ c, 12); \
-	a += b + m[blake2s_sigma[r][2 * i + 1]]; \
-	d = ror32(d ^ a, 8); \
-	c += d; \
-	b = ror32(b ^ c, 7); \
-} while (0)
-
-#define ROUND(r) do { \
-	G(r, 0, v[0], v[ 4], v[ 8], v[12]); \
-	G(r, 1, v[1], v[ 5], v[ 9], v[13]); \
-	G(r, 2, v[2], v[ 6], v[10], v[14]); \
-	G(r, 3, v[3], v[ 7], v[11], v[15]); \
-	G(r, 4, v[0], v[ 5], v[10], v[15]); \
-	G(r, 5, v[1], v[ 6], v[11], v[12]); \
-	G(r, 6, v[2], v[ 7], v[ 8], v[13]); \
-	G(r, 7, v[3], v[ 4], v[ 9], v[14]); \
-} while (0)
-		ROUND(0);
-		ROUND(1);
-		ROUND(2);
-		ROUND(3);
-		ROUND(4);
-		ROUND(5);
-		ROUND(6);
-		ROUND(7);
-		ROUND(8);
-		ROUND(9);
-
-#undef G
-#undef ROUND
-
-		for (i = 0; i < 8; ++i)
-			state->h[i] ^= v[i] ^ v[i + 8];
-
-		block += BLAKE2S_BLOCK_LEN;
-		--nblocks;
-	}
-}
-
-static void blake2s_update(struct blake2s_state *state, const void *inp, size_t inlen)
-{
-	const size_t fill = BLAKE2S_BLOCK_LEN - state->buflen;
-	const uint8_t *in = inp;
-
-	if (!inlen)
-		return;
-	if (inlen > fill) {
-		memcpy(state->buf + state->buflen, in, fill);
-		blake2s_compress(state, state->buf, 1, BLAKE2S_BLOCK_LEN);
-		state->buflen = 0;
-		in += fill;
-		inlen -= fill;
-	}
-	if (inlen > BLAKE2S_BLOCK_LEN) {
-		const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_LEN);
-		blake2s_compress(state, in, nblocks - 1, BLAKE2S_BLOCK_LEN);
-		in += BLAKE2S_BLOCK_LEN * (nblocks - 1);
-		inlen -= BLAKE2S_BLOCK_LEN * (nblocks - 1);
-	}
-	memcpy(state->buf + state->buflen, in, inlen);
-	state->buflen += inlen;
-}
-
-static void blake2s_final(struct blake2s_state *state, uint8_t *out)
-{
-	blake2s_set_lastblock(state);
-	memset(state->buf + state->buflen, 0, BLAKE2S_BLOCK_LEN - state->buflen);
-	blake2s_compress(state, state->buf, 1, state->buflen);
-	cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
-	memcpy(out, state->h, state->outlen);
-}
-
-static ssize_t getrandom_full(void *buf, size_t count, unsigned int flags)
-{
-	ssize_t ret, total = 0;
-	uint8_t *p = buf;
-
-	do {
-		ret = getrandom(p, count, flags);
-		if (ret < 0 && errno == EINTR)
-			continue;
-		else if (ret < 0)
-			return ret;
-		total += ret;
-		p += ret;
-		count -= ret;
-	} while (count);
-	return total;
-}
-
-static ssize_t read_full(int fd, void *buf, size_t count)
-{
-	ssize_t ret, total = 0;
-	uint8_t *p = buf;
-
-	do {
-		ret = read(fd, p, count);
-		if (ret < 0 && errno == EINTR)
-			continue;
-		else if (ret < 0)
-			return ret;
-		else if (ret == 0)
-			break;
-		total += ret;
-		p += ret;
-		count -= ret;
-	} while (count);
-	return total;
-}
-
-static ssize_t write_full(int fd, const void *buf, size_t count)
-{
-	ssize_t ret, total = 0;
-	const uint8_t *p = buf;
-
-	do {
-		ret = write(fd, p, count);
-		if (ret < 0 && errno == EINTR)
-			continue;
-		else if (ret < 0)
-			return ret;
-		total += ret;
-		p += ret;
-		count -= ret;
-	} while (count);
-	return total;
-}
-
-static size_t determine_optimal_seed_len(void)
-{
-	size_t ret = 0;
-	char poolsize_str[11] = { 0 };
-	int fd = open("/proc/sys/kernel/random/poolsize", O_RDONLY);
-
-	if (fd < 0 || read_full(fd, poolsize_str, sizeof(poolsize_str) - 1) < 0) {
-		perror("Unable to determine pool size, falling back to 256 bits");
-		ret = MIN_SEED_LEN;
-	} else
-		ret = DIV_ROUND_UP(strtoul(poolsize_str, NULL, 10), 8);
-	if (fd >= 0)
-		close(fd);
-	if (ret < MIN_SEED_LEN)
-		ret = MIN_SEED_LEN;
-	else if (ret > MAX_SEED_LEN)
-		ret = MAX_SEED_LEN;
-	return ret;
-}
-
-static int read_new_seed(uint8_t *seed, size_t len, bool *is_creditable)
-{
-	ssize_t ret;
-	int urandom_fd;
-
-	*is_creditable = false;
-	ret = getrandom_full(seed, len, GRND_NONBLOCK);
-	if (ret == (ssize_t)len) {
-		*is_creditable = true;
-		return 0;
-	} else if (ret < 0 && errno == ENOSYS) {
-		struct pollfd random_fd = {
-			.fd = open("/dev/random", O_RDONLY),
-			.events = POLLIN
-		};
-		if (random_fd.fd < 0)
-			return -errno;
-		*is_creditable = poll(&random_fd, 1, 0) == 1;
-		close(random_fd.fd);
-	} else if (getrandom_full(seed, len, GRND_INSECURE) == (ssize_t)len)
-		return 0;
-	urandom_fd = open("/dev/urandom", O_RDONLY);
-	if (urandom_fd < 0)
-		return -1;
-	ret = read_full(urandom_fd, seed, len);
-	if (ret == (ssize_t)len)
-		ret = 0;
-	else
-		ret = -errno ? -errno : -EIO;
-	close(urandom_fd);
-	errno = -ret;
-	return ret ? -1 : 0;
-}
-
-static int seed_rng(uint8_t *seed, size_t len, bool credit)
-{
-	struct {
-		int entropy_count;
-		int buf_size;
-		uint8_t buffer[MAX_SEED_LEN];
-	} req = {
-		.entropy_count = credit ? len * 8 : 0,
-		.buf_size = len
-	};
-	int random_fd, ret;
-
-	if (len > sizeof(req.buffer)) {
-		errno = EFBIG;
-		return -1;
-	}
-	memcpy(req.buffer, seed, len);
-
-	random_fd = open("/dev/urandom", O_RDONLY);
-	if (random_fd < 0)
-		return -1;
-	ret = ioctl(random_fd, RNDADDENTROPY, &req);
-	if (ret)
-		ret = -errno ? -errno : -EIO;
-	close(random_fd);
-	errno = -ret;
-	return ret ? -1 : 0;
-}
-
-static int seed_from_file_if_exists(const char *filename, int dfd, bool credit, struct blake2s_state *hash)
-{
-	uint8_t seed[MAX_SEED_LEN];
-	ssize_t seed_len;
-	int fd = -1, ret = 0;
-
-	fd = openat(dfd, filename, O_RDONLY);
-	if (fd < 0 && errno == ENOENT)
-		return 0;
-	else if (fd < 0) {
-		ret = -errno;
-		perror("Unable to open seed file");
-		goto out;
-	}
-	seed_len = read_full(fd, seed, sizeof(seed));
-	if (seed_len < 0) {
-		ret = -errno;
-		perror("Unable to read seed file");
-		goto out;
-	}
-	if ((unlinkat(dfd, filename, 0) < 0 || fsync(dfd) < 0) && seed_len) {
-		ret = -errno;
-		perror("Unable to remove seed after reading, so not seeding");
-		goto out;
-	}
-	if (!seed_len)
-		goto out;
-
-	blake2s_update(hash, &seed_len, sizeof(seed_len));
-	blake2s_update(hash, seed, seed_len);
-
-	printf("Seeding %zd bits %s crediting\n", seed_len * 8, credit ? "and" : "without");
-	if (seed_rng(seed, seed_len, credit) < 0) {
-		ret = -errno;
-		perror("Unable to seed");
-	}
-
-out:
-	if (fd >= 0)
-		close(fd);
-	errno = -ret;
-	return ret ? -1 : 0;
-}
-
-static bool skip_credit(void)
-{
-	const char *skip = getenv("SEEDRNG_SKIP_CREDIT");
-	return skip && (!strcmp(skip, "1") || !strcasecmp(skip, "true") ||
-			!strcasecmp(skip, "yes") || !strcasecmp(skip, "y"));
-}
-
-int main(int argc __attribute__((unused)), char *argv[] __attribute__((unused)))
-{
-	static const char seedrng_prefix[] = "SeedRNG v1 Old+New Prefix";
-	static const char seedrng_failure[] = "SeedRNG v1 No New Seed Failure";
-	int fd = -1, dfd = -1, program_ret = 0;
-	uint8_t new_seed[MAX_SEED_LEN];
-	size_t new_seed_len;
-	bool new_seed_creditable;
-	struct timespec realtime = { 0 }, boottime = { 0 };
-	struct blake2s_state hash;
-
-	umask(0077);
-	if (getuid()) {
-		errno = EACCES;
-		perror("This program requires root");
-		return 1;
-	}
-
-	blake2s_init(&hash, BLAKE2S_HASH_LEN);
-	blake2s_update(&hash, seedrng_prefix, strlen(seedrng_prefix));
-	clock_gettime(CLOCK_REALTIME, &realtime);
-	clock_gettime(CLOCK_BOOTTIME, &boottime);
-	blake2s_update(&hash, &realtime, sizeof(realtime));
-	blake2s_update(&hash, &boottime, sizeof(boottime));
-
-	if (mkdir(SEED_DIR, 0700) < 0 && errno != EEXIST) {
-		perror("Unable to create seed directory");
-		return 1;
-	}
-
-	dfd = open(SEED_DIR, O_DIRECTORY | O_RDONLY);
-	if (dfd < 0 || flock(dfd, LOCK_EX) < 0) {
-		perror("Unable to lock seed directory");
-		program_ret = 1;
-		goto out;
-	}
-
-	if (seed_from_file_if_exists(NON_CREDITABLE_SEED, dfd, false, &hash) < 0)
-		program_ret |= 1 << 1;
-	if (seed_from_file_if_exists(CREDITABLE_SEED, dfd, !skip_credit(), &hash) < 0)
-		program_ret |= 1 << 2;
-
-	new_seed_len = determine_optimal_seed_len();
-	if (read_new_seed(new_seed, new_seed_len, &new_seed_creditable) < 0) {
-		perror("Unable to read new seed");
-		new_seed_len = BLAKE2S_HASH_LEN;
-		strncpy((char *)new_seed, seedrng_failure, new_seed_len);
-		program_ret |= 1 << 3;
-	}
-	blake2s_update(&hash, &new_seed_len, sizeof(new_seed_len));
-	blake2s_update(&hash, new_seed, new_seed_len);
-	blake2s_final(&hash, new_seed + new_seed_len - BLAKE2S_HASH_LEN);
-
-	printf("Saving %zu bits of %s seed for next boot\n", new_seed_len * 8, new_seed_creditable ? "creditable" : "non-creditable");
-	fd = openat(dfd, NON_CREDITABLE_SEED, O_WRONLY | O_CREAT | O_TRUNC, 0400);
-	if (fd < 0) {
-		perror("Unable to open seed file for writing");
-		program_ret |= 1 << 4;
-		goto out;
-	}
-	if (write_full(fd, new_seed, new_seed_len) != (ssize_t)new_seed_len || fsync(fd) < 0) {
-		perror("Unable to write seed file");
-		program_ret |= 1 << 5;
-		goto out;
-	}
-	if (new_seed_creditable && renameat(dfd, NON_CREDITABLE_SEED, dfd, CREDITABLE_SEED) < 0) {
-		perror("Unable to make new seed creditable");
-		program_ret |= 1 << 6;
-	}
-out:
-	if (fd >= 0)
-		close(fd);
-	if (dfd >= 0)
-		close(dfd);
-	return program_ret;
-}

tests/ci.nix

@@ -10,4 +10,5 @@
   tftpboot = import ./tftpboot/test.nix;
   updown = import ./updown/test.nix;
   inout = import ./inout/test.nix;
+  custom-shell = import ./custom-shell/test.nix;
 }

tests/custom-shell/check-prompt.expect

@@ -0,0 +1,7 @@
+set timeout 60
+
+spawn socat unix-connect:vm/console -
+expect {
+  "root@liminix blah blah > " { exit 0 }
+  timeout { exit 1 }
+}

tests/custom-shell/configuration.nix

@@ -0,0 +1,13 @@
+{ config, pkgs, lib, ... } :
+let
+  inherit (pkgs.liminix.networking) interface address hostapd route dnsmasq;
+  inherit (pkgs.liminix.services) oneshot longrun bundle target;
+in rec {
+  imports = [
+    ../../modules/network
+  ];
+
+  defaultProfile.prompt = "$(whoami)@$(hostname) blah blah > ";
+
+  defaultProfile.packages = with pkgs; [ ];
+}

tests/custom-shell/test.nix

@@ -0,0 +1,21 @@
+{
+  liminix
+, nixpkgs
+}:
+let img = (import liminix {
+      inherit nixpkgs;
+      device = import "${liminix}/devices/qemu/";
+      liminix-config = ./configuration.nix;
+    }).outputs.default;
+    pkgs = import nixpkgs { overlays = [(import ../../overlay.nix)]; };
+in pkgs.runCommand "check" {
+  nativeBuildInputs = with pkgs; [
+    expect socat
+  ] ;
+} ''
+. ${../test-helpers.sh}
+
+mkdir vm
+${img}/run.sh --background ./vm
+expect ${./check-prompt.expect} |tee output && mv output $out
+''