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/* ISC license. */
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h> /* rename() */
#include <errno.h>
#include <signal.h>
#include <skalibs/posixplz.h>
#include <skalibs/types.h>
#include <skalibs/sgetopt.h>
#include <skalibs/buffer.h>
#include <skalibs/strerr.h>
#include <skalibs/sig.h>
#include <skalibs/cspawn.h>
#include <skalibs/djbunix.h>
#include <tipidee/config.h>
#include "tipidee-config-internal.h"
#define USAGE "tipidee-config [ -i textfile ] [ -o cdbfile ] [ -m mode ]"
#define dieusage() strerr_dieusage(100, USAGE)
struct global_s g = GLOBAL_ZERO ;
static pid_t pid = 0 ;
static void sigchld_handler (int sig)
{
(void)sig ;
for (;;)
{
int wstat ;
pid_t r = wait_nohang(&wstat) ;
if (r == -1 && errno != ECHILD) strerr_diefu1sys(111, "wait") ;
else if (r <= 0) break ;
else if (r == pid)
{
if (WIFEXITED(wstat) && !WEXITSTATUS(wstat)) pid = 0 ;
else _exit(wait_estatus(wstat)) ;
}
}
}
static inline void conf_output (char const *ofile, unsigned int omode)
{
int fdw ;
cdbmaker cm = CDBMAKER_ZERO ;
size_t olen = strlen(ofile) ;
char otmp[olen + 8] ;
memcpy(otmp, ofile, olen) ;
memcpy(otmp + olen, ":XXXXXX", 8) ;
fdw = mkstemp(otmp) ;
if (fdw == -1) strerr_diefu3sys(111, "open ", otmp, " for writing") ;
if (!cdbmake_start(&cm, fdw))
{
unlink_void(otmp) ;
strerr_diefu2sys(111, "cdmake_start ", otmp) ;
}
if (!conftree_write(&cm))
{
unlink_void(otmp) ;
strerr_diefu2sys(111, "write config tree into ", otmp) ;
}
if (!cdbmake_finish(&cm))
{
unlink_void(otmp) ;
strerr_diefu2sys(111, "cdbmake_finish ", otmp) ;
}
if (fsync(fdw) == -1)
{
unlink_void(otmp) ;
strerr_diefu2sys(111, "fsync ", otmp) ;
}
if (fchmod(fdw, omode & 0777) == -1)
{
unlink_void(otmp) ;
strerr_diefu2sys(111, "fchmod ", otmp) ;
}
if (rename(otmp, ofile) == -1)
{
unlink_void(otmp) ;
strerr_diefu4sys(111, "rename ", otmp, " to ", ofile) ;
}
}
int main (int argc, char const *const *argv, char const *const *envp)
{
char const *ifile = "/etc/tipidee.conf" ;
char const *ofile = "/etc/tipidee.conf.cdb" ;
unsigned int omode = 0644 ;
PROG = "tipidee-config" ;
{
subgetopt l = SUBGETOPT_ZERO ;
for (;;)
{
int opt = subgetopt_r(argc, argv, "i:o:m:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'i' : ifile = l.arg ; break ;
case 'o' : ofile = l.arg ; break ;
case 'm' : if (!uint0_oscan(l.arg, &omode)) dieusage() ; break ;
default : strerr_dieusage(100, USAGE) ;
}
}
argc -= l.ind ; argv += l.ind ;
}
{
int fdr ;
buffer b ;
char buf[4096] ;
sig_block(SIGCHLD) ;
if (!sig_catch(SIGCHLD, &sigchld_handler))
strerr_diefu1sys(111, "install SIGCHLD handler") ;
{
char const *ppargv[3] = { TIPIDEE_LIBEXECPREFIX "tipidee-config-preprocess", ifile, 0 } ;
pid = child_spawn1_pipe(ppargv[0], ppargv, envp, &fdr, 1) ;
if (!pid) strerr_diefu2sys(errno == ENOENT ? 127 : 126, "spawn ", ppargv[0]) ;
}
sig_unblock(SIGCHLD) ;
buffer_init(&b, &buffer_read, fdr, buf, 4096) ;
conf_lexparse(&b, ifile) ;
}
conf_defaults() ;
conf_output(ofile, omode) ;
return 0 ;
}
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