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authorLudovic Courtès <ludo@gnu.org>2016-03-19 14:45:58 +0100
committerLudovic Courtès <ludo@gnu.org>2016-03-19 15:07:46 +0100
commitef5f5c8659b1ca3999e362dfa33478e0a0150ced (patch)
treee2967b666c0434b76e4a16a9346f50fa04067958
parent7c49ab5b1c1aa79a06504456e4decc5112c5b9f9 (diff)
downloadguix-ef5f5c8659b1ca3999e362dfa33478e0a0150ced.tar
guix-ef5f5c8659b1ca3999e362dfa33478e0a0150ced.tar.gz
build: Protect against misconfiguration of localstatedir.
Suggested by Jookia <166291@gmail.com>. * m4/guix.m4 (GUIX_CURRENT_LOCALSTATEDIR, GUIX_CHECK_LOCALSTATEDIR): New macros. * config-daemon.ac: Use 'GUIX_CHECK_LOCALSTATEDIR'. * Makefile.am (DISTCHECK_CONFIGURE_FLAGS): Add --localstatedir. * doc/guix.texi (Requirements): Mention --localstatedir. (The Store): Mention LOCALSTATEDIR as such.
-rw-r--r--Makefile.am4
-rw-r--r--config-daemon.ac2
-rw-r--r--doc/guix.texi14
-rw-r--r--m4/guix.m446
4 files changed, 63 insertions, 3 deletions
diff --git a/Makefile.am b/Makefile.am
index 8a5430794a..a9c281d4d1 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -421,7 +421,11 @@ include daemon.am
endif BUILD_DAEMON
ACLOCAL_AMFLAGS = -I m4
+
+# Pass an explicit '--localstatedir' so that configure does not error out if
+# it finds an existing installation with a different localstatedir.
AM_DISTCHECK_CONFIGURE_FLAGS = \
+ --localstatedir="$$dc_install_base/var" \
--with-libgcrypt-prefix="$(LIBGCRYPT_PREFIX)" \
--with-libgcrypt-libdir="$(LIBGCRYPT_LIBDIR)" \
--with-nix-prefix="$(NIX_PREFIX)" \
diff --git a/config-daemon.ac b/config-daemon.ac
index 63174d62c7..803eb53699 100644
--- a/config-daemon.ac
+++ b/config-daemon.ac
@@ -140,6 +140,8 @@ if test "x$guix_build_daemon" = "xyes"; then
GUIX_TEST_ROOT="$ac_cv_guix_test_root"
AC_SUBST([GUIX_TEST_ROOT])
+ GUIX_CHECK_LOCALSTATEDIR
+
AC_CONFIG_FILES([nix/scripts/list-runtime-roots],
[chmod +x nix/scripts/list-runtime-roots])
AC_CONFIG_FILES([nix/scripts/substitute],
diff --git a/doc/guix.texi b/doc/guix.texi
index b36be05686..868948adfc 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -527,6 +527,14 @@ following packages are also needed:
C++11 standard.
@end itemize
+When configuring Guix on a system that already has a Guix installation,
+be sure to specify the same state directory as the existing installation
+using the @code{--localstatedir} option of the @command{configure}
+script (@pxref{Directory Variables, @code{localstatedir},, standards,
+GNU Coding Standards}). The @command{configure} script protects against
+unintended misconfiguration of @var{localstatedir} so you do not
+inadvertently corrupt your store (@pxref{The Store}).
+
When a working installation of @url{http://nixos.org/nix/, the Nix package
manager} is available, you
can instead configure Guix with @code{--disable-daemon}. In that case,
@@ -2945,9 +2953,9 @@ Sub-directories in the store are referred to as @dfn{store items} or
sometimes @dfn{store paths}. The store has an associated database that
contains information such as the store paths referred to by each store
path, and the list of @emph{valid} store items---results of successful
-builds. This database resides in @file{/var/guix/db} (or under whatever
-state directory was specified @i{via} @option{--localstatedir} at
-configure time).
+builds. This database resides in @file{@var{localstatedir}/guix/db},
+where @var{localstatedir} is the state directory specified @i{via}
+@option{--localstatedir} at configure time, usually @file{/var}.
The store is @emph{always} accessed by the daemon on behalf of its clients
(@pxref{Invoking guix-daemon}). To manipulate the store, clients
diff --git a/m4/guix.m4 b/m4/guix.m4
index acfc33e170..2d3dfd282e 100644
--- a/m4/guix.m4
+++ b/m4/guix.m4
@@ -307,3 +307,49 @@ AC_DEFUN([GUIX_LIBGCRYPT_LIBDIR], [
fi])
$1="$guix_cv_libgcrypt_libdir"
])
+
+dnl GUIX_CURRENT_LOCALSTATEDIR
+dnl
+dnl Determine the localstatedir of an existing Guix installation and set
+dnl 'guix_cv_current_localstatedir' accordingly. Set it to "none" if no
+dnl existing installation was found.
+AC_DEFUN([GUIX_CURRENT_LOCALSTATEDIR], [
+ AC_PATH_PROG([GUILE], [guile])
+ AC_CACHE_CHECK([the current installation's localstatedir],
+ [guix_cv_current_localstatedir],
+ [dnl Call 'dirname' because (guix config) appends "/guix" to LOCALSTATEDIR.
+ guix_cv_current_localstatedir="`"$GUILE" \
+ -c '(use-modules (guix config))
+ (when (string=? %store-directory "'$storedir'")
+ (display (dirname %state-directory)))' \
+ 2>/dev/null`"
+ if test "x$guix_cv_current_localstatedir" = "x"; then
+ guix_cv_current_localstatedir=none
+ fi])])
+
+dnl GUIX_CHECK_LOCALSTATEDIR
+dnl
+dnl Check that the LOCALSTATEDIR value is consistent with that of the existing
+dnl Guix installation, if any. Error out or warn if they do not match.
+AC_DEFUN([GUIX_CHECK_LOCALSTATEDIR], [
+ AC_REQUIRE([GUIX_CURRENT_LOCALSTATEDIR])
+ if test "x$guix_cv_current_localstatedir" != "xnone"; then
+ if test "$guix_cv_current_localstatedir" != "$guix_localstatedir"; then
+ case "$localstatedir" in
+ NONE|\${prefix}*)
+ # User kept the default value---i.e., did not pass '--localstatedir'.
+ AC_MSG_ERROR([chosen localstatedir '$guix_localstatedir' does not match \
+that of the existing installation '$guix_cv_current_localstatedir'
+Installing may corrupt $storedir!
+Use './configure --localstatedir=$guix_cv_current_localstatedir'.])
+ ;;
+ *)
+ # User passed an explicit '--localstatedir'. Assume they know what
+ # they're doing.
+ AC_MSG_WARN([chosen localstatedir '$guix_localstatedir' does not match \
+that of the existing installation '$guix_cv_current_localstatedir'])
+ AC_MSG_WARN([installing may corrupt $storedir!])
+ ;;
+ esac
+ fi
+ fi])