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-rw-r--r--m4/guix.m446
1 files changed, 46 insertions, 0 deletions
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])