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build: Reject or warn against file name length limit overruns.

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* m4/guix.m4 (GUIX_TEST_ROOT_DIRECTORY, LINUX_HASH_BANG_LIMIT,
  SOCKET_FILE_NAME_LIMIT, GUIX_SOCKET_FILE_NAME_LENGTH,
  GUIX_TEST_SOCKET_FILE_NAME_LENGTH, GUIX_HASH_BANG_LENGTH,
  GUIX_CHECK_FILE_NAME_LIMITS): New macros.
* configure.ac: Use 'GUIX_CHECK_FILE_NAME_LIMITS'.
* config-daemon.ac: Use 'GUIX_TEST_ROOT_DIRECTORY'.
* test-env.in: Check socket name length and emit warning if it exceeds
  107.
This commit is contained in:
Ludovic Courtès 2015-02-24 23:05:45 +01:00
parent 43da8f018d
commit 2178ed66f7
4 changed files with 69 additions and 5 deletions
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5
config-daemon.ac
View file

@ -127,9 +127,8 @@ if test "x$guix_build_daemon" = "xyes"; then
fi
dnl Temporary directory used to store the daemon's data.
AC_MSG_CHECKING([for unit test root])
GUIX_TEST_ROOT="`pwd`/test-tmp"
AC_MSG_RESULT([$GUIX_TEST_ROOT])
GUIX_TEST_ROOT_DIRECTORY
GUIX_TEST_ROOT="$ac_cv_guix_test_root"
AC_SUBST([GUIX_TEST_ROOT])
AC_CONFIG_FILES([nix/scripts/list-runtime-roots],

2
configure.ac
View file

@ -50,6 +50,8 @@ AC_SUBST([guix_localstatedir])
AC_SUBST([guix_sysconfdir])
AC_SUBST([guix_sbindir])
GUIX_CHECK_FILE_NAME_LIMITS
dnl We require the pkg.m4 set of macros from pkg-config.
dnl Make sure it's available.
m4_pattern_forbid([PKG_CHECK_MODULES])

58
m4/guix.m4
View file

@ -1,5 +1,5 @@
dnl GNU Guix --- Functional package management for GNU
dnl Copyright © 2012, 2013, 2014 Ludovic Courtès <ludo@gnu.org>
dnl Copyright © 2012, 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
dnl Copyright © 2014 Mark H Weaver <mhw@netris.org>
dnl
dnl This file is part of GNU Guix.
@ -162,3 +162,59 @@ AC_DEFUN([GUIX_CHECK_UNBUFFERED_CBIP], [
ac_cv_guix_cbips_support_setvbuf=no
fi])
])
dnl GUIX_TEST_ROOT_DIRECTORY
AC_DEFUN([GUIX_TEST_ROOT_DIRECTORY], [
AC_CACHE_CHECK([for unit test root directory],
[ac_cv_guix_test_root],
[ac_cv_guix_test_root="`pwd`/test-tmp"])
])
dnl 'BINPRM_BUF_SIZE' constant in Linux. The Hurd has a limit
dnl of about a page (see exec/hashexec.c.)
m4_define([LINUX_HASH_BANG_LIMIT], 128)
dnl Hardcoded 'sun_path' length in <sys/un.h>.
m4_define([SOCKET_FILE_NAME_LIMIT], 108)
dnl GUIX_SOCKET_FILE_NAME_LENGTH
AC_DEFUN([GUIX_SOCKET_FILE_NAME_LENGTH], [
AC_CACHE_CHECK([the length of the installed socket file name],
[ac_cv_guix_socket_file_name_length],
[ac_cv_guix_socket_file_name_length="`echo -n "$guix_localstatedir/guix/daemon-socket/socket" | wc -c`"])
])
dnl GUIX_TEST_SOCKET_FILE_NAME_LENGTH
AC_DEFUN([GUIX_TEST_SOCKET_FILE_NAME_LENGTH], [
AC_REQUIRE([GUIX_TEST_ROOT_DIRECTORY])
AC_CACHE_CHECK([the length of the socket file name used in tests],
[ac_cv_guix_test_socket_file_name_length],
[ac_cv_guix_test_socket_file_name_length="`echo -n "$ac_cv_guix_test_root/var/123456/daemon-socket/socket" | wc -c`"])
])
dnl GUIX_HASH_BANG_LENGTH
AC_DEFUN([GUIX_HASH_BANG_LENGTH], [
AC_CACHE_CHECK([the length of a typical hash bang line],
[ac_cv_guix_hash_bang_length],
[ac_cv_guix_hash_bang_length=`echo -n "$storedir/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-bootstrap-binaries-0/bin/bash" | wc -c`])
])
dnl GUIX_CHECK_FILE_NAME_LIMITS
dnl
dnl GNU/Linux has a couple of silly limits that we can easily run into.
dnl Make sure everything is fine with the current settings.
AC_DEFUN([GUIX_CHECK_FILE_NAME_LIMITS], [
AC_REQUIRE([GUIX_SOCKET_FILE_NAME_LENGTH])
AC_REQUIRE([GUIX_TEST_SOCKET_FILE_NAME_LENGTH])
AC_REQUIRE([GUIX_HASH_BANG_LENGTH])
if test "$ac_cv_guix_socket_file_name_length" -ge ]SOCKET_FILE_NAME_LIMIT[; then
AC_MSG_ERROR([socket file name would exceed the maxium allowed length])
fi
if test "$ac_cv_guix_test_socket_file_name_length" -ge ]SOCKET_FILE_NAME_LIMIT[; then
AC_MSG_WARN([socket file name limit may be exceeded when running tests])
fi
if test "$ac_cv_guix_hash_bang_length" -ge ]LINUX_HASH_BANG_LIMIT[; then
AC_MSG_ERROR([store directory '$storedir' would lead to overly long hash-bang lines])
fi
])

9
test-env.in
View file

@ -1,7 +1,7 @@
#!/bin/sh
# GNU Guix --- Functional package management for GNU
# Copyright © 2012, 2013, 2014 Ludovic Courtès <ludo@gnu.org>
# Copyright © 2012, 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
#
# This file is part of GNU Guix.
#
@ -52,6 +52,13 @@ then
# Currently, in Nix builds, we're at ~106 chars...
NIX_STATE_DIR="@GUIX_TEST_ROOT@/var/$$"
# We can't exit when we reach the limit, because perhaps the test doesn't
# actually rely on the daemon, but at least warn.
if test "`echo -n "$NIX_STATE_DIR/daemon-socket/socket" | wc -c`" -ge 108
then
echo "warning: exceeding socket file name limit; test may fail!" >&2
fi
# The configuration directory, for import/export signing keys.
NIX_CONF_DIR="@GUIX_TEST_ROOT@/etc"
if [ ! -d "$NIX_CONF_DIR" ]