first draft of s6rc_repo_set_compile

Signed-off-by: Laurent Bercot <ska@appnovation.com>

1 files changed, 114 insertions, 0 deletions

diff --git a/src/libs6rc/s6rc_repo_set_compile.c b/src/libs6rc/s6rc_repo_set_compile.c
new file mode 100644
index 0000000..477549a
--- /dev/null
+++ b/src/libs6rc/s6rc_repo_set_compile.c
@@ -0,0 +1,114 @@
+/* ISC license. */
+
+#include <skalibs/bsdsnowflake.h>
+
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#include <skalibs/posixplz.h>
+#include <skalibs/types.h>
+#include <skalibs/tai.h>
+#include <skalibs/cspawn.h>
+#include <skalibs/strerr.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/unix-transactional.h>
+
+#include <s6-rc/config.h>
+#include <s6-rc/repo.h>
+
+int s6rc_repo_set_compile (char const *repo, char const *set, char const *const *subs, size_t nsubs, char *oldc, unsigned int verbosity, char const *fdhuser)
+{
+  size_t repolen = strlen(repo) ;
+  size_t setlen = strlen(repo) ;
+  size_t totsublen = 0 ;
+  char newc[S6RC_REPO_SET_COMPILE_BUFLEN(repolen, setlen)] ;
+  memcpy(newc, repo, repolen) ;
+  memcpy(newc + repolen, "/compiled/.", 11) ;
+  memcpy(newc + repolen + 11, set, setlen) ;
+  newc[repolen + 11 + setlen] = ':' ;
+  timestamp_g(newc + repolen + 12 + setlen) ;
+  memcpy(newc + repolen + 37 + setlen, ":XXXXXX", 8) ;
+  memcpy(oldc, newc, repolen + 10) ;
+  if (mkntemp(newc) == -1) { strerr_warnfu2sys("mkntemp ", newc) ; return -1 ; }
+  for (size_t i = 0 ; i < nsubs ; i++) totsublen += strlen(subs[i]) + 1 ;
+
+  {
+    pid_t pid ;
+    size_t m = 0 ;
+    int wstat ;
+    char const *argv[9 + nsubs + !nsubs] ;
+    char fmtv[UINT_FMT] ;
+    char src[(nsubs + !nsubs) * (repolen + 10 + setlen) + totsublen] ;
+    char *w = src ;
+    fmtv[uint_fmt(fmtv, verbosity)] = 0 ;
+    argv[m++] = S6RC_BINPREFIX "s6-rc-compile" ;
+    argv[m++] = "-v";
+    argv[m++] = fmtv ;
+    argv[m++] = "-b" ;
+    if (fdhuser)
+    {
+      argv[m++] = "-h" ;
+      argv[m++] = fdhuser ;
+    }
+    argv[m++] = "--" ;
+    argv[m++] = newc ;
+    if (nsubs)
+    {
+      for (size_t i = 0 ; i < nsubs ; i++)
+      {
+        size_t sublen = strlen(subs[i]) ;
+        argv[m++] = w ;
+        memcpy(w, repo, repolen) ; w += repolen ;
+        memcpy(w, "/sources/", 9) ; w += 9 ;
+        memcpy(w, set, setlen) ; w += setlen ;
+        *w++ = '/' ;
+        memcpy(w, subs[i], sublen+1) ; w += sublen + 1 ;
+      }
+    }
+    else
+    {
+      argv[m++] = w ;
+      memcpy(w, repo, repolen) ; w += repolen ;
+      memcpy(w, "/sources/", 9) ; w += 9 ;
+      memcpy(w, set, setlen+1) ; w += setlen+1 ;
+    }
+    argv[m++] = 0 ;
+    pid = cspawn(argv[0], argv, (char const *const *)environ, 0, 0, 0) ;
+    if (!pid) { strerr_warnfu2sys("spawn ", argv[0]) ; return -1 ; }
+    if (wait_pid(pid, &wstat) == -1)
+    {
+      strerr_warnfu2sys("wait for ", argv[0]) ;
+      return -1 ;
+    }
+    if (WIFSIGNALED(wstat))
+    {
+      char fmt[UINT_FMT] ;
+      fmt[uint_fmt(fmt, WTERMSIG(wstat))] = 0 ;
+      strerr_warnf3x(argv[0], " crashed with signal ", fmt) ;
+      return -1 ;
+    }
+    if (WEXITSTATUS(wstat))
+    {
+      char fmt[UINT_FMT] ;
+      fmt[uint_fmt(fmt, WEXITSTATUS(wstat))] = 0 ;
+      strerr_warnf3x(argv[0], " exited with code ", fmt) ;
+      return (WEXITSTATUS(wstat) == 1) - 1 ;
+    }
+  }
+  {
+    char fn[repolen + setlen + 11] ;
+    memcpy(fn, newc, repolen + 10) ;
+    memcpy(fn + repolen + 10, set, setlen + 1) ;
+    if (!atomic_symlink4(newc + repolen + 10, fn, oldc + repolen + 10, repolen + setlen + 45))
+    {
+      int e = errno ;
+      rm_rf(newc) ;
+      errno = e ;
+      strerr_warnfu4sys("atomically make a ", fn, " symlink pointing to ", newc + repolen + 10) ;
+      return -1 ;
+    }
+  }
+  return 1 + !!oldc[repolen + 10] ;
+}