From 9c3b28b911ef8774f42d35d500a86fb25bd50d3c Mon Sep 17 00:00:00 2001 From: Manolis Ragkousis Date: Sun, 7 Aug 2016 17:48:30 +0300 Subject: daemon: Do not use clone on the Hurd. Checking for CLONE_NEWNS is only needed for using tha Linux specific clone(2), otherwise we can use fork(2). Using clone on the Hurd needs some work, only support LINUX for now. See https://lists.gnu.org/archive/html/guix-devel/2020-03/msg00190.html * nix/libstore/build.cc (CHROOT_ENABLED): Break into CHROOT_ENABLED and CLONE_ENABLED. (DerivationGoal::startBuilder): Replace CHROOT_ENABLED with __linux__. (DerivationGoal::runChild): Only define pivot_root() if SYS_pivot_root is defined. Co-authored-by: Jan Nieuwenhuizen --- nix/libstore/build.cc | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) (limited to 'nix') diff --git a/nix/libstore/build.cc b/nix/libstore/build.cc index 17e92c68a7..29266f1dd6 100644 --- a/nix/libstore/build.cc +++ b/nix/libstore/build.cc @@ -52,7 +52,12 @@ #endif -#define CHROOT_ENABLED HAVE_CHROOT && HAVE_SYS_MOUNT_H && defined(MS_BIND) && defined(MS_PRIVATE) && defined(CLONE_NEWNS) && defined(SYS_pivot_root) +#define CHROOT_ENABLED HAVE_CHROOT && HAVE_SYS_MOUNT_H && defined(MS_BIND) && defined(MS_PRIVATE) +#define CLONE_ENABLED defined(CLONE_NEWNS) + +#if defined(SYS_pivot_root) +#define pivot_root(new_root, put_old) (syscall(SYS_pivot_root, new_root,put_old)) +#endif #if CHROOT_ENABLED #include @@ -2005,7 +2010,7 @@ void DerivationGoal::startBuilder() - The UTS namespace ensures that builders see a hostname of localhost rather than the actual hostname. */ -#if CHROOT_ENABLED +#if __linux__ if (useChroot) { char stack[32 * 1024]; int flags = CLONE_NEWPID | CLONE_NEWNS | CLONE_NEWIPC | CLONE_NEWUTS | SIGCHLD; @@ -2186,10 +2191,8 @@ void DerivationGoal::runChild() if (mkdir("real-root", 0) == -1) throw SysError("cannot create real-root directory"); -#define pivot_root(new_root, put_old) (syscall(SYS_pivot_root, new_root, put_old)) if (pivot_root(".", "real-root") == -1) throw SysError(format("cannot pivot old root directory onto '%1%'") % (chrootRootDir + "/real-root")); -#undef pivot_root if (chroot(".") == -1) throw SysError(format("cannot change root directory to '%1%'") % chrootRootDir); -- cgit 1.4.1