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/* ISC license. */
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <skalibs/uint16.h>
#include <skalibs/uint.h>
#include <skalibs/bytestr.h>
#include <skalibs/sgetopt.h>
#include <skalibs/strerr2.h>
#include <skalibs/direntry.h>
#include <skalibs/tai.h>
#include <skalibs/djbunix.h>
#include <s6/s6-supervise.h>
#include <s6/ftrigw.h>
#include <s6/ftrigr.h>
#include <s6-rc/s6rc.h>
#define USAGE "s6-rc-init [ -c compiled ] [ -l live ] [ -t timeout ] scandir"
#define dieusage() strerr_dieusage(100, USAGE)
#define dienomem() strerr_diefu1sys(111, "stralloc_catb") ;
static void cleanup (char const *live)
{
int e = errno ;
rm_rf(live) ;
errno = e ;
}
int main (int argc, char const *const *argv)
{
tain_t deadline, tto ;
char const *live = S6RC_LIVE_BASE ;
char const *compiled = S6RC_COMPILED_BASE ;
PROG = "s6-rc-init" ;
{
unsigned int t = 0 ;
subgetopt_t l = SUBGETOPT_ZERO ;
for (;;)
{
register int opt = subgetopt_r(argc, argv, "c:l:t:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'c' : compiled = optarg ; break ;
case 'l' : live = optarg ; break ;
case 't' : if (!uint0_scan(optarg, &t)) dieusage() ; break ;
default : dieusage() ;
}
}
argc -= l.ind ; argv += l.ind ;
if (t) tain_from_millisecs(&tto, t) ;
else tto = tain_infinite_relative ;
}
if (!argc) dieusage() ;
if (compiled[0] != '/')
strerr_dief2x(100, "compiled", " must be an absolute path") ;
if (live[0] != '/')
strerr_dief2x(100, "live", " must be an absolute path") ;
if (argv[0][0] != '/')
strerr_dief2x(100, "scandir", " must be an absolute path") ;
if (mkdir(live, 0755) < 0)
strerr_diefu2sys(111, "mkdir ", live) ;
{
int fdlock ;
int fdcompiled ;
s6rc_db_t db ;
DIR *dir ;
unsigned int ndirs = 0 ;
unsigned int maxlen = 0 ;
unsigned int n ;
unsigned int llen = str_len(live) ;
char lfn[llen + 13] ;
char cfn[llen + 23] ;
/* lock */
byte_copy(lfn, llen, live) ;
byte_copy(lfn + llen, 6, "/lock") ;
fdlock = open_trunc(lfn) ;
if (fdlock < 0)
{
cleanup(live) ;
strerr_diefu2sys(111, "open ", lfn) ;
}
if (lock_ex(fdlock) < 0)
{
cleanup(live) ;
strerr_diefu2sys(111, "lock ", lfn) ;
}
/* compiled */
fdcompiled = open_readb(compiled) ;
if (fdcompiled < 0) strerr_diefu2sys(111, "open ", compiled) ;
byte_copy(lfn + llen + 1, 9, "compiled") ;
if (symlink(compiled, lfn) < 0)
{
cleanup(live) ;
strerr_diefu4sys(111, "symlink ", compiled, " to ", lfn) ;
}
/* scandir */
byte_copy(lfn + llen + 1, 8, "scandir") ;
if (symlink(argv[0], lfn) < 0)
{
cleanup(live) ;
strerr_diefu4sys(111, "symlink ", argv[0], " to ", lfn) ;
}
/* state */
byte_copy(lfn + llen + 1, 6, "state") ;
{
register int r = s6rc_db_read_sizes(fdcompiled, &db) ;
if (r <= 0)
{
cleanup(live) ;
if (r < 0) strerr_diefu2sys(111, "read database size in ", compiled) ;
else strerr_dief2x(4, "invalid database size in ", compiled) ;
}
close(fdcompiled) ;
n = db.nshort + db.nlong ;
{
char zero[n] ;
byte_zero(zero, n) ;
if (!openwritenclose_unsafe(lfn, zero, n))
{
cleanup(live) ;
strerr_diefu2sys(111, "write ", lfn) ;
}
}
}
/* servicedirs */
byte_copy(lfn + llen + 1, 12, "servicedirs") ;
byte_copy(cfn, llen + 1, lfn) ;
byte_copy(cfn + llen + 1, 21, "compiled/servicedirs") ;
if (!hiercopy(cfn, lfn))
{
cleanup(live) ;
strerr_diefu4sys(111, "recursively copy ", cfn, " to ", lfn) ;
}
tain_now_g() ;
tain_add_g(&deadline, &tto) ;
dir = opendir(lfn) ;
if (!dir)
{
cleanup(live) ;
strerr_diefu2sys(111, "opendir ", lfn) ;
}
for (;;)
{
unsigned int thislen ;
direntry *d ;
errno = 0 ;
d = readdir(dir) ;
if (!d) break ;
if (d->d_name[0] == '.') continue ;
thislen = str_len(d->d_name) ;
if (thislen > maxlen) maxlen = thislen ;
ndirs++ ;
}
if (errno)
{
int e = errno ;
dir_close(dir) ;
errno = e ;
cleanup(live) ;
strerr_diefu2sys(111, "readdir ", lfn) ;
}
if (ndirs)
{
ftrigr_t a = FTRIGR_ZERO ;
gid_t gid = getgid() ;
unsigned int i = 0 ;
int r ;
uint16 ids[ndirs] ;
char srcfn[llen + 20 + maxlen] ;
char dstfn[llen + 9 + sizeof(S6_SVSCAN_CTLDIR "/control") + maxlen] ;
rewinddir(dir) ;
byte_copy(srcfn, llen + 12, lfn) ;
srcfn[llen + 12] = '/' ;
byte_copy(dstfn, llen, live) ;
byte_copy(dstfn + llen, 8, "/scandir") ;
dstfn[llen + 8] = '/' ;
if (!ftrigr_startf_g(&a, &deadline))
{
int e = errno ;
dir_close(dir) ;
errno = e ;
cleanup(live) ;
strerr_diefu1sys(111, "start event listener process") ;
}
for (;;)
{
unsigned int thislen ;
direntry *d ;
errno = 0 ;
d = readdir(dir) ;
if (!d) break ;
if (d->d_name[0] == '.') continue ;
thislen = str_len(d->d_name) ;
byte_copy(srcfn + llen + 13, thislen, d->d_name) ;
byte_copy(srcfn + llen + 13 + thislen, 6, "/down") ;
r = open_trunc(srcfn) ;
if (r < 0)
{
cleanup(live) ;
strerr_diefu2sys(111, "touch ", srcfn) ;
}
close(r) ;
byte_copy(srcfn + llen + 14 + thislen, 6, "event") ;
if (!ftrigw_fifodir_make(srcfn, gid, 0))
{
cleanup(live) ;
strerr_diefu2sys(111, "make fifodir ", srcfn) ;
}
ids[i] = ftrigr_subscribe_g(&a, srcfn, "s", 0, &deadline) ;
if (!ids[i])
{
int e = errno ;
dir_close(dir) ;
errno = e ;
cleanup(live) ;
strerr_diefu2sys(111, "subscribe to ", srcfn) ;
}
srcfn[llen + 13 + thislen] = 0 ;
byte_copy(dstfn + llen + 9, thislen + 1, d->d_name) ;
if (symlink(srcfn, dstfn) < 0)
{
int e = errno ;
dir_close(dir) ;
errno = e ;
cleanup(live) ;
strerr_diefu4sys(111, "symlink ", srcfn, " to ", dstfn) ;
}
i++ ;
}
if (errno)
{
int e = errno ;
dir_close(dir) ;
errno = e ;
cleanup(live) ;
strerr_diefu2sys(111, "readdir ", lfn) ;
}
dir_close(dir) ;
byte_copy(dstfn + llen + 9, sizeof(S6_SVSCAN_CTLDIR "/control"), S6_SVSCAN_CTLDIR "/control") ;
r = s6_svc_write(dstfn, "a", 1) ;
if (r < 0)
{
cleanup(live) ;
strerr_diefu2sys(111, "write to ", dstfn) ;
}
if (!r) strerr_warnw2x("s6-svscan not running on ", argv[0]) ;
else
{
if (ftrigr_wait_and_g(&a, ids, ndirs, &deadline) < 0)
{
cleanup(live) ;
strerr_diefu1sys(111, "wait for s6-supervise processes to come up") ;
}
}
ftrigr_end(&a) ;
}
else dir_close(dir) ;
}
return 0 ;
}
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