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daemon: Do not use clone on the Hurd.

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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 <janneke@gnu.org>
This commit is contained in:
Manolis Ragkousis 2016-08-07 17:48:30 +03:00 committed by Jan Nieuwenhuizen
parent 496d607db3
commit 9c3b28b911
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GPG key ID: F3C1A0D9C1D65273
1 changed files with 7 additions and 4 deletions
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11
nix/libstore/build.cc
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@ -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 <sys/socket.h>
@ -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);