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/* ISC license. */
#include <errno.h>
#include <stdint.h>
#include <string.h>
#include <sys/stat.h>
#include <libgen.h>
#include <skalibs/posixplz.h>
#include <skalibs/types.h>
#include <skalibs/sgetopt.h>
#include <skalibs/tai.h>
#include <skalibs/strerr.h>
#include <skalibs/stralloc.h>
#include <skalibs/djbunix.h>
#include <s6/supervise.h>
#define USAGE "s6-svlink [ -d | -D ] [ -f ] [ -P ] [ -t timeout ] scandir servicedir [ name ]"
#define dieusage() strerr_dieusage(100, USAGE)
static inline void checkscandir (char const *s)
{
int r ;
int fd ;
size_t len = strlen(s) ;
char fn[len + 6 + sizeof(S6_SVSCAN_CTLDIR)] ;
memcpy(fn, s, len) ;
memcpy(fn + len, "/" S6_SVSCAN_CTLDIR "/lock", 6 + sizeof(S6_SVSCAN_CTLDIR)) ;
fd = open_read(fn) ;
if (fd < 0) strerr_diefu2sys(111, "open ", fn) ;
r = fd_islocked(fd) ;
if (r < 0) strerr_diefu2sys(111, "check lock on ", fn) ;
if (!r) strerr_dief2x(1, "s6-svscan not running on ", s) ;
fd_close(fd) ;
}
static inline void checkservicedir (char const *s)
{
int r ;
struct stat st ;
size_t len = strlen(s) ;
char fn[len + 9] ;
memcpy(fn, s, len) ;
memcpy(fn + len, "/run", 5) ;
if (stat(fn, &st) == -1) strerr_diefu2sys(111, "stat ", fn) ;
if (!(st.st_mode & S_IXUSR)) strerr_dief2x(100, fn, " is not executable") ;
r = s6_svc_ok(s) ;
if (r < 0) strerr_diefu2sys(111, "check supervision status of ", s) ;
if (r) strerr_warnw2x("supervisor already running on ", s) ;
memcpy(fn + len + 1, "log", 4) ;
if (stat(fn, &st) == -1)
{
if (errno != ENOENT) strerr_diefu2sys(111, "stat ", fn) ;
}
else
{
if (!S_ISDIR(st.st_mode)) strerr_dief2x(100, fn, " is not a directory") ;
memcpy(fn + len + 4, "/run", 5) ;
if (stat(fn, &st) == -1) strerr_diefu2sys(111, "stat ", fn) ;
if (!(st.st_mode & S_IXUSR)) strerr_dief2x(100, fn, " is not executable") ;
fn[len + 4] = 0 ;
r = s6_svc_ok(fn) ;
if (r < 0) strerr_diefu2sys(111, "check supervision status of ", fn) ;
if (r) strerr_warnw2x("supervisor already running on ", fn) ;
}
}
int main (int argc, char const *const *argv)
{
tain tto = TAIN_INFINITE_RELATIVE ;
uint32_t options = 0 ;
char const *name ;
PROG = "s6-svlink" ;
{
unsigned int t = 0 ;
subgetopt l = SUBGETOPT_ZERO ;
for (;;)
{
int opt = subgetopt_r(argc, argv, "dDfPt:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'd' : options |= 12 ; break ;
case 'D' : options |= 4 ; options &= ~8U ; break ;
case 'f' : options |= 1 ; break ;
case 'P' : options |= 2 ; break ;
case 't' : if (!uint0_scan(l.arg, &t)) dieusage() ; break ;
default : dieusage() ;
}
}
argc -= l.ind ; argv += l.ind ;
if (t) tain_from_millisecs(&tto, t) ;
}
if (argc < 2) dieusage() ;
if (argv[2]) name = argv[2] ;
else
{
stralloc sa = STRALLOC_ZERO ;
if (!stralloc_cats(&sa, argv[1]) || !stralloc_0(&sa))
strerr_diefu1sys(111, "stralloc_cats") ;
name = basename(sa.s) ;
}
if (!argv[0][0]) strerr_dief1x(100, "invalid scandir") ;
if (!argv[1][0]) strerr_dief1x(100, "invalid servicedir") ;
if (!name[0] || name[0] == '.' || name[0] == '/')
strerr_dief1x(100, "invalid name") ;
checkscandir(argv[0]) ;
checkservicedir(argv[1]) ;
tain_now_set_stopwatch_g() ;
tain_add_g(&tto, &tto) ;
if (s6_supervise_link_names_g(argv[0], argv + 1, &name, 1, options, &tto) == -1)
strerr_diefu6sys(errno == ETIMEDOUT ? 99 : 111, "link servicedir ", argv[1], " into scandir ", argv[0], " with name ", name) ;
return 0 ;
}
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