From 8671af033b2f5512e9138cbadcfc068b3ae3e135 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Thu, 18 Sep 2025 23:18:13 +0000
Subject:  Support bundles in changestate, various refactors

---
 src/libs6rc/s6rc_repo_flattenservices.c | 73 +++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 src/libs6rc/s6rc_repo_flattenservices.c

(limited to 'src/libs6rc/s6rc_repo_flattenservices.c')

diff --git a/src/libs6rc/s6rc_repo_flattenservices.c b/src/libs6rc/s6rc_repo_flattenservices.c
new file mode 100644
index 0000000..15363ac
--- /dev/null
+++ b/src/libs6rc/s6rc_repo_flattenservices.c
@@ -0,0 +1,73 @@
+/* ISC license. */
+
+#include <sys/wait.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include <skalibs/posixplz.h>
+#include <skalibs/types.h>
+#include <skalibs/strerr.h>
+#include <skalibs/stralloc.h>
+#include <skalibs/genalloc.h>
+#include <skalibs/cspawn.h>
+#include <skalibs/djbunix.h>
+
+#include <s6-rc/config.h>
+#include <s6-rc/s6rc-utils.h>
+#include <s6-rc/repo.h>
+
+int s6rc_repo_flattenservices (char const *repo, char const *const *services, uint32_t n, stralloc *storage, genalloc *indices)
+{
+  int swasnull = !storage->s ;
+  int gwasnull = !indices->s ;
+  size_t sabase = storage->len ;
+  size_t gabase = genalloc_len(size_t, indices) ;
+
+  {
+    size_t m = 0 ;
+    size_t repolen = strlen(repo) ;
+    pid_t pid ;
+    int fd ;
+    int wstat ;
+    char const *argv[7 + n] ;
+    char refdb[repolen + 15] ;
+    memcpy(refdb, repo, repolen) ;
+    memcpy(refdb + repolen, "/compiled/.ref", 15) ;
+    argv[m++] = S6RC_BINPREFIX "s6-rc-db" ;
+    argv[m++] = "-c";
+    argv[m++] = refdb ;
+    argv[m++] = "-b" ;
+    argv[m++] = "--" ;
+    argv[m++] = "atomics" ;
+    for (size_t i = 0 ; i < n ; i++) argv[m++] = services[i] ;
+    argv[m++] = 0 ;
+    pid = child_spawn1_pipe(argv[0], argv, (char const *const *)environ, &fd, 1) ;
+    if (!pid) { strerr_warnfu2sys("spawn ", argv[0]) ; return 111 ; }
+    if (!slurpn(fd, storage, 0)) { strerr_warnfu2sys("read output from ", argv[0]) ; return 111 ; }
+    fd_close(fd) ;
+    if (wait_pid(pid, &wstat) == -1)
+    {
+      strerr_warnfu2sys("wait for ", argv[0]) ;
+      goto err ;
+    }
+    if (WIFSIGNALED(wstat))
+    {
+      char fmt[UINT_FMT] ;
+      fmt[uint_fmt(fmt, WTERMSIG(wstat))] = 0 ;
+      strerr_warnf3x(argv[0], " crashed with signal ", fmt) ;
+      goto err ;
+    }
+    if (WEXITSTATUS(wstat)) return WEXITSTATUS(wstat) ;
+  }
+
+  if (!s6rc_nlto0(storage->s + sabase, sabase, storage->len, indices)) goto err ;
+  return 0 ;
+
+ err:
+  if (gwasnull) genalloc_free(size_t, indices) ;
+  else genalloc_setlen(size_t, indices, gabase) ;
+  if (swasnull) stralloc_free(storage) ;
+  else storage->len = sabase ;
+  return 111 ;
+}
-- 
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