Support building glibc in a mock chroot using older systemd-nspawn (#1869030).

Resolves: #1869030

glibc-rhbz1869030-faccessat2-eperm.patch

@@ -0,0 +1,25 @@
+With older systemd-nspawn the faccessat2 syscall was denied but
+instead of returning ENOSYS it returned EPERM. This has since
+been corrected in upstream systemd-nsapwn, but with older builders
+that may have older nspawn the Fedora Rawhide glibc should fall
+back to faccessat when it sees ENOSYS *or* EPERM. This is a
+Fedora Rawhide-only patch that should be removed before the next
+release.
+
+diff --git a/sysdeps/unix/sysv/linux/faccessat.c b/sysdeps/unix/sysv/linux/faccessat.c
+index 56cb6dcc8b4d58d3..5de75032bbc93a2c 100644
+--- a/sysdeps/unix/sysv/linux/faccessat.c
++++ b/sysdeps/unix/sysv/linux/faccessat.c
+@@ -34,7 +34,11 @@ faccessat (int fd, const char *file, int mode, int flag)
+ #if __ASSUME_FACCESSAT2
+   return ret;
+ #else
+-  if (ret == 0 || errno != ENOSYS)
++  /* Fedora-specific workaround:
++     As a workround for a broken systemd-nspawn that returns
++     EPERM when a syscall is not allowed instead of ENOSYS
++     we must check for EPERM here and fall back to faccessat.  */
++  if (ret == 0 || !(errno == ENOSYS || errno == EPERM))
+     return ret;
+ 
+   if (flag & ~(AT_SYMLINK_NOFOLLOW | AT_EACCESS))

glibc.spec

@@ -96,7 +96,7 @@
 Summary: The GNU libc libraries
 Name: glibc
 Version: %{glibcversion}
-Release: 3%{?dist}
+Release: 4%{?dist}
 
 # In general, GPLv2+ is used by programs, LGPLv2+ is used for
 # libraries.
@@ -169,6 +169,7 @@ Patch23: glibc-python3.patch
 Patch29: glibc-fedora-nsswitch.patch
 Patch30: glibc-deprecated-selinux-makedb.patch
 Patch31: glibc-deprecated-selinux-nscd.patch
+Patch32: glibc-rhbz1869030-faccessat2-eperm.patch
 
 ##############################################################################
 # Continued list of core "glibc" package information:
@@ -2019,6 +2020,9 @@ fi
 %files -f compat-libpthread-nonshared.filelist -n compat-libpthread-nonshared
 
 %changelog
+* Thu Aug 20 2020 Carlos O'Donell <carlos@redhat.com> - 2.32.9000-4
+- Support building glibc in a mock chroot using older systemd-nspawn (#1869030).
+
 * Tue Aug 18 2020 Carlos O'Donell <carlos@redhat.com> - 2.32.9000-3
 - Suggest installing minimal localization e.g. C, POSIX, C.UTF-8.