internal/rosa: busybox from source

This will be part of the standard toolchain.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/busybox.go

@@ -5,6 +5,8 @@ import (
 	"io"
 	"net/http"
 	"os"
+	"slices"
+	"strings"
 	"time"
 
 	"hakurei.app/container/fhs"
@@ -97,3 +99,260 @@ func newBusyboxBin() pkg.Artifact {
 		)}),
 	)
 }
+
+// NewBusybox returns a [pkg.Artifact] containing a dynamically linked busybox
+// installation usable within the [Toolchain] it is compiled against.
+func (t Toolchain) NewBusybox() pkg.Artifact {
+	const (
+		version  = "1.37.0"
+		checksum = "Ial94Tnt7esJ_YEeb0AxunVL6MGYFyOw7Rtu2o87CXCi1TLrc6rlznVsN1rZk7it"
+	)
+
+	extra := []pkg.Artifact{
+		t.NewMake(),
+		t.NewKernelHeaders(),
+	}
+	var env []string
+
+	if t == toolchainStage3 {
+		extra = nil
+		env = append(env, "EXTRA_LDFLAGS=-static")
+	}
+
+	return t.New("busybox-"+version, extra, nil, slices.Concat([]string{
+		"ROSA_BUSYBOX_ENABLE=" + strings.Join([]string{
+			"STATIC",
+			"PIE",
+		}, " "),
+		"ROSA_BUSYBOX_DISABLE=" + strings.Join([]string{
+			"FEATURE_IPV6",
+			"FEATURE_PREFER_IPV4_ADDRESS",
+			"FEATURE_HWIB",
+			"ARP",
+			"ARPING",
+			"BRCTL",
+			"FEATURE_BRCTL_FANCY",
+			"FEATURE_BRCTL_SHOW",
+			"DNSD",
+			"ETHER_WAKE",
+			"FTPD",
+			"FEATURE_FTPD_WRITE",
+			"FEATURE_FTPD_ACCEPT_BROKEN_LIST",
+			"FEATURE_FTPD_AUTHENTICATION",
+			"FTPGET",
+			"FTPPUT",
+			"FEATURE_FTPGETPUT_LONG_OPTIONS",
+			"HOSTNAME",
+			"DNSDOMAINNAME",
+			"HTTPD",
+			"FEATURE_HTTPD_PORT_DEFAULT",
+			"FEATURE_HTTPD_RANGES",
+			"FEATURE_HTTPD_SETUID",
+			"FEATURE_HTTPD_BASIC_AUTH",
+			"FEATURE_HTTPD_AUTH_MD5",
+			"FEATURE_HTTPD_CGI",
+			"FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR",
+			"FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV",
+			"FEATURE_HTTPD_ENCODE_URL_STR",
+			"FEATURE_HTTPD_ERROR_PAGES",
+			"FEATURE_HTTPD_PROXY",
+			"FEATURE_HTTPD_GZIP",
+			"FEATURE_HTTPD_ETAG",
+			"FEATURE_HTTPD_LAST_MODIFIED",
+			"FEATURE_HTTPD_DATE",
+			"FEATURE_HTTPD_ACL_IP",
+			"IFCONFIG",
+			"FEATURE_IFCONFIG_STATUS",
+			"FEATURE_IFCONFIG_SLIP",
+			"FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ",
+			"FEATURE_IFCONFIG_HW",
+			"FEATURE_IFCONFIG_BROADCAST_PLUS",
+			"IFENSLAVE",
+			"IFPLUGD",
+			"IFUP",
+			"IFDOWN",
+			"IFUPDOWN_IFSTATE_PATH",
+			"FEATURE_IFUPDOWN_IP",
+			"FEATURE_IFUPDOWN_IPV4",
+			"FEATURE_IFUPDOWN_IPV6",
+			"FEATURE_IFUPDOWN_MAPPING",
+			"INETD",
+			"FEATURE_INETD_SUPPORT_BUILTIN_ECHO",
+			"FEATURE_INETD_SUPPORT_BUILTIN_DISCARD",
+			"FEATURE_INETD_SUPPORT_BUILTIN_TIME",
+			"FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME",
+			"FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN",
+			"IP",
+			"IPADDR",
+			"IPLINK",
+			"IPROUTE",
+			"IPTUNNEL",
+			"IPRULE",
+			"IPNEIGH",
+			"FEATURE_IP_ADDRESS",
+			"FEATURE_IP_LINK",
+			"FEATURE_IP_LINK_CAN",
+			"FEATURE_IP_ROUTE",
+			"FEATURE_IP_ROUTE_DIR",
+			"FEATURE_IP_TUNNEL",
+			"FEATURE_IP_RULE",
+			"FEATURE_IP_NEIGH",
+			"IPCALC",
+			"FEATURE_IPCALC_LONG_OPTIONS",
+			"FEATURE_IPCALC_FANCY",
+			"FAKEIDENTD",
+			"NAMEIF",
+			"FEATURE_NAMEIF_EXTENDED",
+			"NBDCLIENT",
+			"NC",
+			"NC_SERVER",
+			"NC_EXTRA",
+			"NC_110_COMPAT",
+			"NETSTAT",
+			"FEATURE_NETSTAT_WIDE",
+			"FEATURE_NETSTAT_PRG",
+			"NSLOOKUP",
+			"FEATURE_NSLOOKUP_BIG",
+			"FEATURE_NSLOOKUP_LONG_OPTIONS",
+			"NTPD",
+			"FEATURE_NTPD_SERVER",
+			"FEATURE_NTPD_CONF",
+			"FEATURE_NTP_AUTH",
+			"PING",
+			"PING6",
+			"FEATURE_FANCY_PING",
+			"PSCAN",
+			"ROUTE",
+			"SLATTACH",
+			"SSL_CLIENT",
+			"TC",
+			"FEATURE_TC_INGRESS",
+			"TCPSVD",
+			"UDPSVD",
+			"TELNET",
+			"FEATURE_TELNET_TTYPE",
+			"FEATURE_TELNET_AUTOLOGIN",
+			"FEATURE_TELNET_WIDTH",
+			"TELNETD",
+			"FEATURE_TELNETD_STANDALONE",
+			"FEATURE_TELNETD_PORT_DEFAULT",
+			"FEATURE_TELNETD_INETD_WAIT",
+			"TFTP",
+			"FEATURE_TFTP_PROGRESS_BAR",
+			"FEATURE_TFTP_HPA_COMPAT",
+			"TFTPD",
+			"FEATURE_TFTP_GET",
+			"FEATURE_TFTP_PUT",
+			"FEATURE_TFTP_BLOCKSIZE",
+			"TLS",
+			"TRACEROUTE",
+			"TRACEROUTE6",
+			"FEATURE_TRACEROUTE_VERBOSE",
+			"FEATURE_TRACEROUTE_USE_ICMP",
+			"TUNCTL",
+			"FEATURE_TUNCTL_UG",
+			"VCONFIG",
+			"WGET",
+			"FEATURE_WGET_LONG_OPTIONS",
+			"FEATURE_WGET_STATUSBAR",
+			"FEATURE_WGET_FTP",
+			"FEATURE_WGET_AUTHENTICATION",
+			"FEATURE_WGET_TIMEOUT",
+			"FEATURE_WGET_HTTPS",
+			"FEATURE_WGET_OPENSSL",
+			"WHOIS",
+			"ZCIP",
+			"UDHCPD",
+			"FEATURE_UDHCPD_BOOTP",
+			"FEATURE_UDHCPD_WRITE_LEASES_EARLY",
+			"DHCPD_LEASES_FILE",
+			"DUMPLEASES",
+			"DHCPRELAY",
+			"UDHCPC",
+			"FEATURE_UDHCPC_ARPING",
+			"FEATURE_UDHCPC_SANITIZEOPT",
+			"UDHCPC_DEFAULT_SCRIPT",
+			"UDHCPC6_DEFAULT_SCRIPT",
+			"UDHCPC6",
+			"FEATURE_UDHCPC6_RFC3646",
+			"FEATURE_UDHCPC6_RFC4704",
+			"FEATURE_UDHCPC6_RFC4833",
+			"FEATURE_UDHCPC6_RFC5970",
+		}, " "),
+	}, env), `
+config_enable() {
+	for ent in "$@"; do
+		sed "s/^# CONFIG_${ent}.*/CONFIG_${ent}=y/" -i .config
+		shift
+	done
+}
+
+config_disable() {
+	for ent in "$@"; do
+		sed "s/^CONFIG_${ent}=y/# CONFIG_${ent} is not set/" -i .config
+		shift
+	done
+}
+
+cat > /bin/gcc << EOF
+exec clang \
+	-Wno-ignored-optimization-argument \
+	${ROSA_CFLAGS} \
+	${LDFLAGS} \
+	\$@
+EOF
+chmod +x /bin/gcc
+
+cd /usr/src/busybox
+chmod +w editors editors/awk.c
+patch -p 1 < /usr/src/patches/awk-fix-literal-backslash.patch
+
+cd "$(mktemp -d)"
+make \
+	KBUILD_SRC=/usr/src/busybox \
+	-f /usr/src/busybox/Makefile \
+	defconfig
+
+config_enable $ROSA_BUSYBOX_ENABLE
+config_disable $ROSA_BUSYBOX_DISABLE
+ln -s ../system/bin/pwd /bin/pwd || true
+make CFLAGS_busybox="${LDFLAGS} ${EXTRA_LDFLAGS}" "-j$(nproc)"
+
+mkdir -p /system/bin/ /work/bin/
+cp busybox /system/bin/
+
+mkdir -pv /work/system/bin/
+busybox --install -s /work/system/bin/
+cp -v busybox /work/system/bin/
+ln -vs ../system/bin/hush /work/bin/sh
+`, pkg.Path(AbsUsrSrc.Append("busybox"), true, pkg.NewHTTPGetTar(
+		&http.Client{Transport: &http.Transport{
+			// busybox website is really slow to respond
+			TLSHandshakeTimeout: 2 * time.Minute,
+		}},
+		"https://busybox.net/downloads/busybox-"+version+".tar.bz2",
+		mustDecode(checksum),
+		pkg.TarBzip2,
+	)), pkg.Path(
+		AbsUsrSrc.Append("patches", "awk-fix-literal-backslash.patch"), false,
+		pkg.NewFile("awk-fix-literal-backslash.patch", []byte(`diff --git a/editors/awk.c b/editors/awk.c
+index 64e752f4b..40f5ba7f7 100644
+--- a/editors/awk.c
++++ b/editors/awk.c
+@@ -2636,8 +2636,13 @@ static int awk_sub(node *rn, const char *repl, int nm, var *src, var *dest /*,in
+ 					resbuf = qrealloc(resbuf, residx + replen + n, &resbufsize);
+ 					memcpy(resbuf + residx, sp + pmatch[j].rm_so - start_ofs, n);
+ 					residx += n;
+-				} else
++				} else {
++/* '\\' and '&' following a backslash keep its original meaning, any other
++ * occurrence of a '\\' should be treated as literal */
++					if (bslash && c != '\\' && c != '&')
++						resbuf[residx++] = '\\';
+ 					resbuf[residx++] = c;
++				}
+ 				bslash = 0;
+ 			}
+ 		}`)),
+	))
+}