From 662532a0cf11ee73e855ac5cb668976da0542630 Mon Sep 17 00:00:00 2001
From: obarun <eric@obarun.org>
Date: Sat, 16 Jan 2021 16:10:09 +1100
Subject: [PATCH] add -z option. Pass new variable to rc.init file: CONTAINER,
CATCHLOG, RCINIT_CONTAINER. Handle booting inside a container
---
src/66/66-boot.c | 463 ++++++++++++++++++++++++++++++++++++-----------
1 file changed, 354 insertions(+), 109 deletions(-)
diff --git a/src/66/66-boot.c b/src/66/66-boot.c
index 39571d8e..e01a04e9 100644
--- a/src/66/66-boot.c
+++ b/src/66/66-boot.c
@@ -21,6 +21,11 @@
#include <sys/mount.h>
#include <sys/reboot.h>
+#ifdef __linux__
+ #include <linux/kd.h>
+ #include <skalibs/sig.h>
+#endif
+
#include <oblibs/log.h>
#include <oblibs/files.h>
#include <oblibs/string.h>
@@ -38,46 +43,51 @@
static mode_t mask = SS_BOOT_UMASK ;
static unsigned int rescan = SS_BOOT_RESCAN ;
+static unsigned int container = SS_BOOT_CONTAINER ;
+static unsigned int catch_log = SS_BOOT_CATCH_LOG ;
static char const *skel = SS_SKEL_DIR ;
static char *live = SS_LIVE ;
static char const *path = SS_BOOT_PATH ;
static char const *tree = SS_BOOT_TREE ;
static char const *rcinit = SS_SKEL_DIR SS_BOOT_RCINIT ;
+static char const *rcinit_container = SS_SKEL_DIR SS_BOOT_RCINIT_CONTAINER ;
static char const *banner = "\n[Starts stage1 process...]" ;
static char const *slashdev = 0 ;
static char const *envdir = 0 ;
static char const *fifo = 0 ;
static char const *log_user = SS_LOGGER_RUNNER ;
static char const *cver = 0 ;
-static char tpath[MAXENV+1] ;
-static char trcinit[MAXENV+1] ;
-static char tlive[MAXENV+1] ;
-static char ttree[MAXENV+1] ;
-static char confile[MAXENV+1] ;
+static char tpath[MAXENV + 1] ;
+static char trcinit[MAXENV + 1] ;
+static char trcinit_container[MAXENV + 1] ;
+static char tlive[MAXENV + 1] ;
+static char ttree[MAXENV + 1] ;
+static char confile[MAXENV + 1] ;
static char const *const *genv = 0 ;
static int fdin ;
static char const *proc_cmdline="/proc/cmdline" ;
static stralloc sacmdline = STRALLOC_ZERO ;
+static int notifpipe[2] ;
#define MAXBUF 1024*64*2
-#define USAGE "66-boot [ -h ] [ -m ] [ -s skel ] [ -l log_user ] [ -e environment ] [ -d dev ] [ -b banner ]"
+#define USAGE "66-boot [ -h ] [ -z ] [ -m ] [ -s skel ] [ -l log_user ] [ -e environment ] [ -d dev ] [ -b banner ]"
static void sulogin(char const *msg,char const *arg)
{
static char const *const newarg[2] = { SS_EXTBINPREFIX "sulogin" , 0 } ;
pid_t pid ;
int wstat ;
- fd_close(0) ;
+ close(0) ;
if (dup2(fdin,0) == -1) log_dieu(LOG_EXIT_SYS,"duplicate stdin -- you are on your own") ;
- fd_close(fdin) ;
+ close(fdin) ;
if (*msg) log_warnu(msg,arg) ;
pid = child_spawn0(newarg[0],newarg,genv) ;
if (waitpid_nointr(pid,&wstat, 0) < 0)
log_dieusys(LOG_EXIT_SYS,"wait for sulogin -- you are on your own") ;
fdin=dup(0) ;
if (fdin == -1) log_dieu(LOG_EXIT_SYS,"duplicate stdin -- you are on your own") ;
- fd_close(0) ;
+ close(0) ;
if (open("/dev/null",O_WRONLY)) log_dieu(LOG_EXIT_SYS,"open /dev/null -- you are on your own") ;
}
@@ -88,9 +98,10 @@ static inline void info_help (void)
"\n"
"options :\n"
" -h: print this help\n"
+" -z: use color\n"
" -m: mount parent live directory\n"
-" -l: run catch-all logger as log_user user\n"
" -s: skeleton directory\n"
+" -l: run catch-all logger as log_user user\n"
" -e: environment directory or file\n"
" -d: dev directory\n"
" -b: banner to display\n"
@@ -149,8 +160,6 @@ static int read_line(stralloc *dst, char const *line)
static int get_value(stralloc *val,char const *key)
{
- log_flow() ;
-
if (!environ_get_val_of_key(val,key)) return 0 ;
/** value may be empty, in this case we use the default one */
if (!sastr_clean_element(val))
@@ -164,12 +173,33 @@ static int get_value(stralloc *val,char const *key)
return 1 ;
}
+static inline void string_to_table(char *table,char const *pointer,char const *str, uint8_t empty)
+{
+ log_flow() ;
+
+ if (!empty) {
+ auto_strings(table,str) ;
+ pointer = table ;
+ }
+}
+
+static inline uint8_t string_to_uint(char const *str, unsigned int *ui, uint8_t empty)
+{
+ log_flow() ;
+
+ if (!empty)
+ if (!uint0_oscan(str,ui))
+ return 0 ;
+
+ return 1 ;
+}
+
static void parse_conf(void)
{
log_flow() ;
static char const *valid[] =
- { "VERBOSITY", "PATH", "LIVE", "TREE", "RCINIT", "UMASK", "RESCAN", 0 } ;
+ { "VERBOSITY", "PATH", "LIVE", "TREE", "RCINIT", "UMASK", "RESCAN", "CONTAINER", "CATCHLOG", "RCINIT_CONTAINER", 0 } ;
int r ;
unsigned int j = 0 ;
uint8_t empty = 0 ;
@@ -222,71 +252,148 @@ static void parse_conf(void)
switch (j)
{
- case 0: if (!empty)
- if (!uint0_scan(val.s, &VERBOSITY)) sulogin("parse VERBOSITY value: ",val.s) ;
-
- u[uint_fmt(u, VERBOSITY)] = 0 ;
- if (!auto_stra(&sacmdline,"VERBOSITY=",u,"\n"))
- sulogin("append environment stralloc with key: VERBOSITY=",u) ;
- break ;
- case 1: if (!empty) {
- memcpy(tpath,val.s,val.len) ;
- tpath[val.len] = 0 ;
- path = tpath ;
- }
- if (!auto_stra(&sacmdline,"PATH=",path,"\n"))
- sulogin("append environment stralloc with key: PATH=",path) ;
- break ;
- case 2: if (!empty) {
- memcpy(tlive,val.s,val.len) ;
- tlive[val.len] = 0 ;
- live = tlive ;
- if (live[0] != '/') sulogin ("LIVE must be an absolute path",val.s) ;
- }
- if (!auto_stra(&sacmdline,"LIVE=",live,"\n"))
- sulogin("append environment stralloc with key: LIVE=",live) ;
- break ;
- case 3: if (!empty) {
- memcpy(ttree,val.s,val.len) ;
- ttree[val.len] = 0 ;
- tree = ttree ;
- }
- if (!auto_stra(&sacmdline,"TREE=",tree,"\n"))
- sulogin("append environment stralloc with key: TREE=",tree) ;
- break ;
- case 4: if (!empty) {
- memcpy(trcinit,val.s,val.len) ;
- trcinit[val.len] = 0 ;
- rcinit = trcinit ;
- if (rcinit[0] != '/') sulogin ("RCINIT must be an absolute path: ",val.s) ;
- }
- if (!auto_stra(&sacmdline,"RCINIT=",rcinit,"\n"))
- sulogin("append environment stralloc with key: RCINIT=",rcinit) ;
- break ;
- case 5: if (!empty)
- if (!uint0_oscan(val.s, &mask)) sulogin("invalid UMASK value: ",val.s) ;
-
- u[uint_fmt(u, mask)] = 0 ;
- if (!auto_stra(&sacmdline,"UMASK=",u,"\n"))
- sulogin("append environment stralloc with key: UMASK=",u) ;
- break ;
- case 6: if (!empty)
- if (!uint0_scan(val.s, &rescan)) sulogin("invalid RESCAN value: ",val.s) ;
-
- u[uint_fmt(u, rescan)] = 0 ;
- if (!auto_stra(&sacmdline,"RESCAN=",u,"\n"))
- sulogin("append environment stralloc with key: RESCAN=",u) ;
- break ;
+ case 0:
+
+ if (!string_to_uint(val.s,&VERBOSITY,empty))
+ sulogin("parse VERBOSITY value: ",val.s) ;
+
+ u[uint_fmt(u, VERBOSITY)] = 0 ;
+ if (!auto_stra(&sacmdline,"VERBOSITY=",u,"\n"))
+ sulogin("append environment stralloc with key: VERBOSITY=",u) ;
+ break ;
+
+ case 1:
+
+ string_to_table(tpath,path,val.s,empty) ;
+
+ if (!auto_stra(&sacmdline,"PATH=",path,"\n"))
+ sulogin("append environment stralloc with key: PATH=",path) ;
+ break ;
+
+ case 2:
+
+ string_to_table(tlive,live,val.s,empty) ;
+
+ if (live[0] != '/')
+ sulogin ("LIVE must be an absolute path",live) ;
+
+ if (!auto_stra(&sacmdline,"LIVE=",live,"\n"))
+ sulogin("append environment stralloc with key: LIVE=",live) ;
+ break ;
+
+ case 3:
+
+ string_to_table(ttree,tree,val.s,empty) ;
+
+ if (!auto_stra(&sacmdline,"TREE=",tree,"\n"))
+ sulogin("append environment stralloc with key: TREE=",tree) ;
+ break ;
+
+ case 4:
+
+ string_to_table(trcinit,rcinit,val.s,empty) ;
+
+ if (rcinit[0] != '/')
+ sulogin ("RCINIT must be an absolute path: ",rcinit) ;
+
+ if (!auto_stra(&sacmdline,"RCINIT=",rcinit,"\n"))
+ sulogin("append environment stralloc with key: RCINIT=",rcinit) ;
+ break ;
+
+ case 5:
+
+ if (!string_to_uint(val.s,&mask,empty))
+ sulogin("invalid UMASK value: ",val.s) ;
+
+ u[uint_fmt(u, mask)] = 0 ;
+ if (!auto_stra(&sacmdline,"UMASK=",u,"\n"))
+ sulogin("append environment stralloc with key: UMASK=",u) ;
+ break ;
+
+ case 6:
+
+ if (!string_to_uint(val.s,&rescan,empty))
+ sulogin("invalid RESCAN value: ",val.s) ;
+
+ u[uint_fmt(u, rescan)] = 0 ;
+ if (!auto_stra(&sacmdline,"RESCAN=",u,"\n"))
+ sulogin("append environment stralloc with key: RESCAN=",u) ;
+ break ;
+
+ case 7:
+
+ if (!string_to_uint(val.s,&container,empty))
+ sulogin("invalid CONTAINER value: ",val.s) ;
+
+ u[uint_fmt(u,container)] = 0 ;
+ if (!auto_stra(&sacmdline,"CONTAINER=",u,"\n"))
+ sulogin("append environment stralloc with key: CONTAINER=",u) ;
+
+ break ;
+
+ case 8:
+
+ if (!string_to_uint(val.s,&catch_log,empty))
+ sulogin("invalid CATCHLOG value: ",val.s) ;
+
+ u[uint_fmt(u,catch_log)] = 0 ;
+ if (!auto_stra(&sacmdline,"CATCHLOG=",u,"\n"))
+ sulogin("append environment stralloc with key: CATCHLOG=",u) ;
+ break ;
+
+ case 9:
+
+ string_to_table(trcinit_container,rcinit_container,val.s,empty) ;
+
+ if (rcinit_container[0] != '/')
+ sulogin ("RCINIT_CONTAINER must be an absolute path: ",rcinit_container) ;
+
+ if (!auto_stra(&sacmdline,"RCINIT_CONTAINER=",rcinit_container,"\n"))
+ sulogin("append environment stralloc with key: RCINIT_CONTAINER=",rcinit_container) ;
+ break ;
+
default: break ;
}
}
+ if (container) {
+ if (!auto_stra(&sacmdline,"CONTAINER_HALTCMD=",live,SS_BOOT_CONTAINER_DIR,"/0/",SS_BOOT_CONTAINER_HALTCMD,"\n")) {
+ char tmp[strlen(live) + SS_BOOT_CONTAINER_DIR_LEN + 1 + SS_BOOT_CONTAINER_HALTCMD_LEN +1] ;
+ auto_strings(tmp,live,SS_BOOT_CONTAINER_DIR,"/",SS_BOOT_CONTAINER_HALTCMD) ;
+ sulogin("append environment stralloc with key: CONTAINER_HALTCMD=",tmp) ;
+ }
+ }
+
if (!sastr_split_string_in_nline(&sacmdline)) sulogin("split string: ",sacmdline.s) ;
+
stralloc_free(&val) ;
stralloc_free(&cmdline) ;
stralloc_free(&src) ;
}
+static inline void wait_for_notif (int fd)
+{
+ log_flow() ;
+
+ char buf[16] ;
+ for (;;) {
+
+ ssize_t r = read(fd, buf, 16) ;
+ if (r < 0)
+ sulogin("read from notification pipe","") ;
+
+ if (!r) {
+ log_warn("s6-svscan failed to send a notification byte!") ;
+ break ;
+ }
+
+ if (memchr(buf, '\n', r))
+ break ;
+ }
+
+ close(fd) ;
+}
+
static int is_mnt(char const *str)
{
log_flow() ;
@@ -323,22 +430,46 @@ static inline void run_stage2 (char const *const *envp, size_t envlen, char cons
log_flow() ;
size_t pos = 0 ;
- char const *newargv[3] = { rcinit, confile, 0 } ;
+ char const *newargv[3] ;
+
+ if (container) {
+ newargv[0]= rcinit_container ;
+
+ } else {
+
+ newargv[0] = rcinit ;
+ }
+
+ newargv[1] = confile ;
+ newargv[2] = 0 ;
+
setsid() ;
- fd_close(1) ;
- if (open(fifo, O_WRONLY) != 1) /* blocks until catch-all logger is up */
- sulogin("open for writing fifo: ",fifo) ;
- if (fd_copy(2, 1) == -1)
- sulogin("copy stderr to stdout","") ;
- fd_close(fdin) ;
+
+ if (catch_log) {
+
+ close(notifpipe[1]) ;
+ wait_for_notif(notifpipe[0]) ;
+ }
+ else {
+
+ close(1) ;
+ if (open(fifo, O_WRONLY) != 1) /* blocks until catch-all logger is up */
+ sulogin("open for writing fifo: ",fifo) ;
+ if (fd_copy(2, 1) == -1)
+ sulogin("copy stderr to stdout","") ;
+ }
+
+ close(fdin) ;
+
for (;pos < modiflen ; pos += strlen(modifs + pos) +1)
if (!stralloc_catb(&sacmdline,modifs + pos, strlen(modifs + pos) + 1))
sulogin("append environment stralloc with value: ",modifs + pos) ;
+
size_t tlen = sacmdline.len ;
char t[tlen + 1] ;
- memcpy(t,sacmdline.s,tlen) ;
- t[tlen] = 0 ;
+ auto_strings(t,sacmdline.s) ;
stralloc_free(&sacmdline) ;
+ //xmexec_fm(newargv, envp, envlen, t, tlen) ;
xpathexec_r(newargv, envp, envlen, t, tlen) ;
}
@@ -371,29 +502,60 @@ static inline void make_cmdline(char const *prog,char const **add,int len,char c
run_cmdline(newargv,envp,msg,arg) ;
}
+static void cad(void)
+{
+ log_flow() ;
+
+ if (container)
+ return ;
+
+#ifdef __linux__
+ int fd ;
+ fd = open("/dev/tty0", O_RDONLY | O_NOCTTY) ;
+ if (fd < 0) {
+ log_warnusys("open /dev/", "tty0 (kbrequest will not be handled)") ;
+ }
+ else {
+
+ if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
+ log_warnusys("ioctl KDSIGACCEPT on tty0 (kbrequest will not be handled)") ;
+ close(fd) ;
+ }
+
+ sig_block(SIGINT) ; /* don't panic on early cad before s6-svscan catches it */
+#endif
+
+ if (reboot(RB_DISABLE_CAD) == -1)
+ log_warnusys("trap ctrl-alt-del") ;
+
+}
+
int main(int argc, char const *const *argv,char const *const *envp)
{
VERBOSITY = 0 ;
- unsigned int r , tmpfs = 0 ;
+ unsigned int r , tmpfs = 0, opened = 0 ;
size_t bannerlen, livelen ;
pid_t pid ;
- int opened = 0 ;
char verbo[UINT_FMT] ;
cver = verbo ;
stralloc envmodifs = STRALLOC_ZERO ;
genv = envp ;
+
+ log_color = &log_color_disable ;
+
PROG = "66-boot" ;
{
subgetopt_t l = SUBGETOPT_ZERO ;
for (;;)
{
- int opt = getopt_args(argc,argv, ">hms:e:d:b:l:", &l) ;
+ int opt = getopt_args(argc,argv, ">hzms:e:d:b:l:", &l) ;
if (opt == -1) break ;
if (opt == -2) sulogin("options must be set first","") ;
switch (opt)
{
case 'h' : info_help(); return 0 ;
+ case 'z' : log_color = !isatty(1) ? &log_color_disable : &log_color_enable ; break ;
case 'm' : tmpfs = 1 ; break ;
case 's' : skel = l.arg ; break ;
case 'e' : envdir = l.arg ; break ;
@@ -416,33 +578,69 @@ int main(int argc, char const *const *argv,char const *const *envp)
bannerlen = strlen(banner) ;
livelen = strlen(live) ;
char tfifo[livelen + 1 + SS_BOOT_LOGFIFO_LEN + 1] ;
- memcpy(tfifo,live,livelen) ;
- tfifo[livelen] = '/' ;
- memcpy(tfifo + livelen + 1,SS_BOOT_LOGFIFO,SS_BOOT_LOGFIFO_LEN) ;
- tfifo[livelen + 1 + SS_BOOT_LOGFIFO_LEN] = 0 ;
+ auto_strings(tfifo,live,"/",SS_BOOT_LOGFIFO) ;
fifo = tfifo ;
- allwrite(1, banner, bannerlen) ;
- allwrite(1, "\n", 2) ;
+ if (container) {
+ /* If there's a Docker synchronization pipe, wait on it */
+ char c ;
+ ssize_t r = read(3, &c, 1) ;
+ if (r < 0) {
+
+ if (errno != EBADF)
+ sulogin("read from fd 3","") ;
+
+ } else {
+
+ if (r)
+ log_warn("parent wrote to fd 3!") ;
+
+ close(3) ;
+ }
+ } else {
+
+ allwrite(1, banner, bannerlen) ;
+ allwrite(1, "\n", 2) ;
+ }
+
if (chdir("/") == -1) sulogin("chdir to ","/") ;
umask(mask) ;
setpgid(0, 0) ;
- fd_close(0) ;
+ close(0) ;
+
+ if (container && slashdev)
+ log_1_warn("-d options asked for a boot inside a container; are you sure your container does not come with a pre-mounted /dev?") ;
if (slashdev)
{
log_info("Mount: ",slashdev) ;
- fd_close(1) ;
- fd_close(2) ;
+ close(1) ;
+ close(2) ;
if (mount("dev", slashdev, "devtmpfs", MS_NOSUID | MS_NOEXEC, "") == -1)
{ opened++ ; sulogin ("mount: ", slashdev) ; }
if (open("/dev/console", O_WRONLY) ||
- fd_copy(1, 0) == -1 ||
- fd_move(2, 0) == -1) return 111 ;
+ fd_move(2, 0) == -1 ||
+ fd_copy(1, 2) == -1) return 111 ;
+ }
+
+ if (!opened) {
+
+ if (open("/dev/null", O_RDONLY)) {
+
+ /* ghetto /dev/null to the rescue */
+ int p[2] ;
+ log_1_warnusys("open /dev/null") ;
+
+ if (pipe(p) < 0)
+ sulogin("pipe for /dev/null","") ;
+
+ close(p[1]) ;
+
+ if (fd_move(0, p[0]) < 0)
+ sulogin("fd_move to stdin","") ;
+ }
}
- if (!opened)
- if (open("/dev/null", O_RDONLY)) sulogin("open: ", "/dev/null") ;
char fs[livelen + 1] ;
split_tmpfs(fs,live) ;
@@ -463,9 +661,27 @@ int main(int argc, char const *const *argv,char const *const *envp)
if (setenv("PATH", path, 1) == -1) sulogin("set initial PATH: ",path) ;
/** create scandir */
{
- char const *t[] = { "-b", "-c", "-s", skel, "-L", log_user } ;
+ size_t nargc = 6 + catch_log ;
+ unsigned int m = 0 ;
+
+ char const *t[nargc] ;
+
+ if (container) {
+ t[m++] = "-B" ;
+ } else {
+ t[m++] = "-b" ;
+ }
+
+ if (!catch_log)
+ t[m++] = "-c" ;
+
+ t[m++] = "-s" ;
+ t[m++] = skel ;
+ t[m++] = "-L" ;
+ t[m++] = log_user ;
+ t[m++] = "create" ;
log_info("Create live scandir at: ",live) ;
- make_cmdline(SS_EXTBINPREFIX "66-scandir",t,6,"create live scandir at: ",live,envp) ;
+ make_cmdline(SS_EXTBINPREFIX "66-scandir",t,nargc,"create live scandir at: ",live,envp) ;
}
/** initiate earlier service */
{
@@ -480,6 +696,7 @@ int main(int argc, char const *const *argv,char const *const *envp)
if (!sastr_split_string_in_nline(&envmodifs)) sulogin("rebuild environment: ",envdir) ;
}
+ if (catch_log)
{
log_info("Starts boot logger at: ",live,"/log/0") ;
int fdr = open_read(fifo) ;
@@ -491,26 +708,54 @@ int main(int argc, char const *const *argv,char const *const *envp)
/** fork and starts scandir */
{
- static char const *newargv[7] ;
- newargv[0] = SS_EXTBINPREFIX "66-scandir" ;
- newargv[1] = "-v" ;
- newargv[2] = verbo ;
- newargv[3] = "-l" ;
- newargv[4] = live ;
- newargv[5] = "-u" ;
- newargv[6] = 0 ;
- char const *newenvp[2] = { 0, 0 } ;
size_t pathlen = strlen(path) ;
+ char const *newenvp[2] = { 0, 0 } ;
char pathvar[6 + pathlen] ;
+ char fmtfd[2 + UINT_FMT] = "-" ;
+
+ size_t m = 0 ;
+ static char const *newargv[7] ;
+ newargv[m++] = SS_EXTBINPREFIX "66-scanctl" ;
+ newargv[m++] = "-v0" ;
+ if (!catch_log)
+ newargv[m++] = fmtfd ;
+ newargv[m++] = "-l" ;
+ newargv[m++] = live ;
+ newargv[m++] = "start" ;
+ newargv[m++] = 0 ;
+
memcpy(pathvar, "PATH=", 5) ;
memcpy(pathvar + 5, path, pathlen + 1) ;
+
newenvp[0] = pathvar ;
+
+ if (!catch_log && pipe(notifpipe) < 0)
+ sulogin("pipe","") ;
+
pid = fork() ;
- if (pid == -1) sulogin("fork: ",rcinit) ;
- if (!pid) run_stage2(newenvp, 1, envmodifs.s,envmodifs.len) ;
- if (reboot(RB_DISABLE_CAD) == -1) log_warnusys("trap ctrl-alt-del") ;
- if (fd_copy(2, 1) == -1) sulogin("copy stderr to stdout","") ;
- fd_close(fdin) ;
+
+ if (pid == -1)
+ sulogin("fork: ",container ? rcinit_container : rcinit) ;
+
+ if (!pid)
+ run_stage2(newenvp, 1, envmodifs.s,envmodifs.len) ;
+
+ if (!catch_log) {
+
+ close(notifpipe[0]) ;
+ fmtfd[1] = 'd' ;
+ fmtfd[2 + uint_fmt(fmtfd + 2, notifpipe[1])] = 0 ;
+ cad() ;
+
+ } else {
+
+ cad() ;
+ if (fd_copy(2, 1) == -1)
+ sulogin("copy stderr to stdout","") ;
+ }
+
+ close(fdin) ;
+ // xmexec_fm(newargv, newenvp, 1, envmodifs.s, envmodifs.len) ;
xpathexec_r(newargv, newenvp, 1, envmodifs.s, envmodifs.len) ;
}
}
--
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