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-rw-r--r--m4/guix.m427
1 files changed, 22 insertions, 5 deletions
diff --git a/m4/guix.m4 b/m4/guix.m4
index 1e5985b30b..acfc33e170 100644
--- a/m4/guix.m4
+++ b/m4/guix.m4
@@ -1,5 +1,5 @@
dnl GNU Guix --- Functional package management for GNU
-dnl Copyright © 2012, 2013, 2014, 2015 Ludovic Courtès <ludo@gnu.org>
+dnl Copyright © 2012, 2013, 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
dnl Copyright © 2014 Mark H Weaver <mhw@netris.org>
dnl
dnl This file is part of GNU Guix.
@@ -175,9 +175,9 @@ AC_DEFUN([GUIX_TEST_ROOT_DIRECTORY], [
[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 'BINPRM_BUF_SIZE' constant in Linux (we leave room for the trailing zero.)
+dnl The Hurd has a limit of about a page (see exec/hashexec.c.)
+m4_define([LINUX_HASH_BANG_LIMIT], 127)
dnl Hardcoded 'sun_path' length in <sys/un.h>.
m4_define([SOCKET_FILE_NAME_LIMIT], 108)
@@ -204,14 +204,24 @@ AC_DEFUN([GUIX_HASH_BANG_LENGTH], [
[ac_cv_guix_hash_bang_length=`echo -n "$storedir/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-bootstrap-binaries-0/bin/bash" | wc -c`])
])
+dnl GUIX_TEST_HASH_BANG_LENGTH
+AC_DEFUN([GUIX_TEST_HASH_BANG_LENGTH], [
+ AC_REQUIRE([GUIX_TEST_ROOT_DIRECTORY])
+ AC_CACHE_CHECK([the length of a hash bang line used in tests],
+ [ac_cv_guix_test_hash_bang_length],
+ [ac_cv_guix_test_hash_bang_length=`echo -n "$ac_cv_guix_test_root/store/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.
+dnl Make sure everything is fine with the current settings. Set $1 to
+dnl 'yes' if tests can run, 'no' otherwise.
AC_DEFUN([GUIX_CHECK_FILE_NAME_LIMITS], [
AC_REQUIRE([GUIX_SOCKET_FILE_NAME_LENGTH])
AC_REQUIRE([GUIX_TEST_SOCKET_FILE_NAME_LENGTH])
AC_REQUIRE([GUIX_HASH_BANG_LENGTH])
+ AC_REQUIRE([GUIX_TEST_HASH_BANG_LENGTH])
if test "$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])
@@ -219,9 +229,16 @@ AC_DEFUN([GUIX_CHECK_FILE_NAME_LIMITS], [
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
+
+ $1=yes
if test "$ac_cv_guix_hash_bang_length" -ge ]LINUX_HASH_BANG_LIMIT[; then
+ $1=no
AC_MSG_ERROR([store directory '$storedir' would lead to overly long hash-bang lines])
fi
+ if test "$ac_cv_guix_test_hash_bang_length" -ge ]LINUX_HASH_BANG_LIMIT[; then
+ $1=no
+ AC_MSG_WARN([test directory '$ac_cv_guix_test_root' may lead to overly long hash-bang lines])
+ fi
])
dnl GUIX_CHECK_CXX11