1 files changed, 123 insertions, 0 deletions
diff --git a/src/serverlib/s6rc_servicedir_manage.c b/src/serverlib/s6rc_servicedir_manage.c
new file mode 100644
index 0000000..5449f35
--- /dev/null
+++ b/src/serverlib/s6rc_servicedir_manage.c
@@ -0,0 +1,123 @@
+/* ISC license. */
+
+#include <string.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <errno.h>
+#include <skalibs/direntry.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/stralloc.h>
+#include <skalibs/genalloc.h>
+#include <s6/s6-supervise.h>
+#include <s6/ftrigr.h>
+#include <s6/ftrigw.h>
+#include <s6-rc/s6rc-servicedir.h>
+
+static inline void rollback (char const *live, char const *prefix, char const *s, size_t len)
+{
+  while (len)
+  {
+    size_t n = strlen(s) + 1 ;
+    s6rc_servicedir_unsupervise(live, prefix, s, 0) ;
+    s += n ; len -= n ;
+  }
+}
+
+int s6rc_servicedir_manage (char const *live, char const *prefix, tain_t const *deadline, tain_t *stamp)
+{
+  ftrigr_t a = FTRIGR_ZERO ;
+  stralloc newnames = STRALLOC_ZERO ;
+  genalloc ids = GENALLOC_ZERO ; /* uint16_t */
+  gid_t gid = getgid() ;
+  size_t livelen = strlen(live) ;
+  size_t prefixlen = strlen(prefix) ;
+  int fdlock ;
+  int ok = 1 ;
+  DIR *dir ;
+  char dirfn[livelen + 13] ;
+  if (!ftrigr_startf(&a, deadline, stamp)) return 0 ;
+  memcpy(dirfn, live, livelen) ;
+  memcpy(dirfn + livelen, "/servicedirs", 13) ;
+  dir = opendir(dirfn) ;
+  if (!dir) goto closederr ;
+  for (;;)
+  {
+    direntry *d ;
+    errno = 0 ;
+    d = readdir(dir) ;
+    if (!d) break ;
+    if (d->d_name[0] == '.') continue ;
+    {
+      size_t len = strlen(d->d_name) ;
+      int r ;
+      uint16_t id ;
+      char srcfn[livelen + 20 + len] ;
+      char dstfn[livelen + 10 + prefixlen + len] ;
+      memcpy(srcfn, dirfn, livelen + 12) ;
+      srcfn[livelen + 12] = '/' ;
+      memcpy(srcfn + livelen + 13, d->d_name, len + 1) ;
+      fdlock = s6_svc_lock_take(srcfn) ;
+      if (fdlock < 0) goto err ;
+      r = s6_svc_ok(srcfn) ;
+      if (r < 0) goto erru ;
+      if (!r)
+      {
+        memcpy(srcfn + livelen + 13 + len, "/down", 6) ;
+        if (!touch(srcfn)) goto erru ;
+        memcpy(srcfn + livelen + 14 + len, "event", 6) ;
+        if (!ftrigw_fifodir_make(srcfn, gid, 0)) goto erru ;
+        id = ftrigr_subscribe(&a, srcfn, "s", 0, deadline, stamp) ;
+        if (!id) goto erru ;
+        s6_svc_lock_release(fdlock) ;
+        if (!genalloc_append(uint16_t, &ids, &id)) goto err ;
+        srcfn[livelen + 13 + len] = 0 ;
+      }
+      else s6_svc_lock_release(fdlock) ;
+      memcpy(dstfn, live, livelen) ;
+      memcpy(dstfn + livelen, "/scandir/", 9) ;
+      memcpy(dstfn + livelen + 9, prefix, prefixlen) ;
+      memcpy(dstfn + livelen + 9 + prefixlen, d->d_name, len + 1) ;
+      if (symlink(srcfn, dstfn) < 0)
+      {
+        if (!r || errno != EEXIST) goto err ;
+      }
+      else if (!r)
+      {
+        if (!stralloc_catb(&newnames, d->d_name, len + 1))
+        {
+          s6rc_servicedir_unsupervise(live, prefix, d->d_name, 0) ;
+          goto err ;
+        }
+      }
+    }
+  }
+  if (errno) goto err ;
+  dir_close(dir) ;
+  {
+    char scanfn[livelen + 9] ;
+    int r ;
+    memcpy(scanfn, live, livelen) ;
+    memcpy(scanfn + livelen, "/scandir", 9) ;
+    r = s6_svc_writectl(scanfn, S6_SVSCAN_CTLDIR, "a", 1) ;
+    if (r < 0) goto closederr ;
+    if (!r) ok = 3 ;
+    else if (ftrigr_wait_and(&a, genalloc_s(uint16_t, &ids), genalloc_len(uint16_t, &ids), deadline, stamp) < 0)
+      goto closederr ;
+  }
+
+  ftrigr_end(&a) ;
+  genalloc_free(uint16_t, &ids) ;
+  stralloc_free(&newnames) ;
+  return ok ;
+
+ erru:
+  s6_svc_lock_release(fdlock) ;
+ err:
+  dir_close(dir) ;
+ closederr:
+  ftrigr_end(&a) ;
+  genalloc_free(uint16_t, &ids) ;
+  rollback(live, prefix, newnames.s, newnames.len) ;
+  stralloc_free(&newnames) ;
+  return 0 ;
+}