1 files changed, 57 insertions, 0 deletions
diff --git a/src/libs6rc/s6rc_repo_set_moveservices.c b/src/libs6rc/s6rc_repo_set_moveservices.c
new file mode 100644
index 0000000..bdaba4a
--- /dev/null
+++ b/src/libs6rc/s6rc_repo_set_moveservices.c
@@ -0,0 +1,57 @@
+/* ISC license. */
+
+#include <string.h>
+#include <errno.h>
+#include <stdio.h>
+
+#include <skalibs/strerr.h>
+
+#include <s6-rc/repo.h>
+
+int s6rc_repo_set_moveservices (char const *repo, char const *set, char const *const *services, size_t n, char const *fromsub, char const *tosub)
+{
+  size_t repolen = strlen(repo) ;
+  size_t setlen = strlen(set) ;
+  size_t fromsublen = strlen(fromsub) ;
+  size_t tosublen = strlen(tosub) ;
+  size_t maxserviceslen = 0 ;
+  size_t i = 0 ;
+  for (; i < n ; i++)
+  {
+    size_t len = strlen(services[i]) ;
+    if (len > maxserviceslen) maxserviceslen = len ;
+  }
+  char from[repolen + setlen + fromsublen + maxserviceslen + 12] ;
+  char to[repolen + setlen + tosublen + maxserviceslen + 12] ;
+  memcpy(from, repo, repolen) ;
+  memcpy(from + repolen, "/sources/", 9) ;
+  memcpy(from + repolen + 9, set, setlen) ;
+  from[repolen + 9 + setlen] = '/' ;
+  memcpy(to, from, repolen + 10 + setlen) ;
+  memcpy(from + repolen + 10 + setlen, fromsub, fromsublen) ;
+  from[repolen + 10 + setlen + fromsublen] = '/' ;
+  memcpy(to + repolen + 10 + setlen, tosub, tosublen) ;
+  to[repolen + 10 + setlen + tosublen] = '/' ;
+  for (i = 0 ; i < n ; i++)
+  {
+    size_t len = strlen(services[i]) ;
+    memcpy(from + repolen + setlen + fromsublen + 11, services[i], len + 1) ;
+    memcpy(to + repolen + setlen + tosublen + 11, services[i], len + 1) ;
+    if (rename(from, to) == -1) goto rollback ;
+  }
+  return 1 ;
+
+ rollback:
+  int e = errno ;
+  strerr_warnfu4sys("rename ", from, " to ", to) ;
+  while (i--)
+  {
+    size_t len = strlen(services[i]) ;
+    memcpy(from + repolen + setlen + fromsublen + 11, services[i], len + 1) ;
+    memcpy(to + repolen + setlen + tosublen + 11, services[i], len + 1) ;
+    if (rename(to, from) == -1)
+      strerr_warnwu4sys("rollback ", to, " to ", from) ;
+  }
+  errno = e ;
+  return 0 ;
+}