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authorLaurent Bercot <ska-skaware@skarnet.org>2021-08-28 17:18:08 +0000
committerLaurent Bercot <ska@appnovation.com>2021-08-28 17:18:08 +0000
commitfa7f29ff4b5aef142143e9c1d887d73788b703e4 (patch)
tree0ec096b01f94af5a376e37d8720c35f936c449bb /src/supervision/s6-svdir-link.c
parent8f00f3a276b4fde40bcd0ddaa4dc89d2b5791d89 (diff)
downloads6-fa7f29ff4b5aef142143e9c1d887d73788b703e4.tar.xz
Add s6-svdir-link and s6-svdir-unlink
Not tested yet; not documented yet; to come soon. Signed-off-by: Laurent Bercot <ska@appnovation.com>
Diffstat (limited to 'src/supervision/s6-svdir-link.c')
-rw-r--r--src/supervision/s6-svdir-link.c104
1 files changed, 104 insertions, 0 deletions
diff --git a/src/supervision/s6-svdir-link.c b/src/supervision/s6-svdir-link.c
new file mode 100644
index 0000000..6eeb0a2
--- /dev/null
+++ b/src/supervision/s6-svdir-link.c
@@ -0,0 +1,104 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <stdint.h>
+#include <string.h>
+#include <sys/stat.h>
+
+#include <skalibs/types.h>
+#include <skalibs/sgetopt.h>
+#include <skalibs/tai.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/djbunix.h>
+
+#include <s6/s6-supervise.h>
+
+#define USAGE "s6-svdir-link [ -d ] [ -f ] [ -P | -p ] [ -t timeout ] scandir name servicedir"
+#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", 4) ;
+ 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 ;
+ PROG = "s6-svdir-link" ;
+ {
+ unsigned int t = 0 ;
+ subgetopt l = SUBGETOPT_ZERO ;
+ for (;;)
+ {
+ int opt = subgetopt_r(argc, argv, "dfPpt:", &l) ;
+ if (opt == -1) break ;
+ switch (opt)
+ {
+ case 'd' : options |= 4 ; break ;
+ case 'f' : options |= 1 ; break ;
+ case 'P' : options |= 2 ; break ;
+ case 'p' : options &= ~2U ; 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 < 3) dieusage() ;
+
+ if (!argv[0][0]) strerr_dief1x(100, "invalid scandir") ;
+ if (!argv[1][0]) strerr_dief1x(100, "invalid name") ;
+ if (!argv[2][0]) strerr_dief1x(100, "invalid servicedir") ;
+ checkscandir(argv[0]) ;
+
+ tain_now_set_stopwatch_g() ;
+ tain_add_g(&tto, &tto) ;
+
+ if (s6_supervise_link_names_g(argv[0], argv + 2, argv + 1, 1, options, &tto) == -1)
+ strerr_diefu6sys(111, "link servicedir ", argv[2], " into scandir ", argv[0], " with name ", argv[1]) ;
+ return 0 ;
+}