add protect_special_libs function

2 files changed, 33 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index b814dac710..b2f75ea589 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2019-01-09 Treeve Jelbert <treeve@sourcemage.org>
+	* protect_special_libs: added, function to protect special libraries
+	  in such spells as glibc, readlin, ncurses
+
 2019-01-08 Pavel Vinogradov <public@sourcemage.org>
 	* kernel.gpg: added new key, 95CDE47E,
 	  Stephen Hemminger (Microsoft corporate) <sthemmin@microsoft.com>
diff --git a/protect_special_libs b/protect_special_libs
new file mode 100644
index 0000000000..b258c61a9f
--- /dev/null
+++ b/protect_special_libs
@@ -0,0 +1,29 @@
+# some spells install their libraries to /lib and these are linked to by bash.
+# these libraries must be preserved while the spell is being upgraded
+# these functions should be called during the PRE_INSTALL of such spells
+# candidate spells for this would be glibc, ncurses, readline
+
+lock_resources "libgrimoire" "install"  &&
+PROTECT=$SOURCE_DIRECTORY/$SPELL.old.libs &&
+
+if [[ -z $INSTALL_ROOT ]]; then
+ protect_special_libs() {
+  mkdir -p $PROTECT  &&
+  local each  &&
+  for each in /lib{,64,32}/*; do
+    if test -f "$each"; then
+      cp -a "$each" $PROTECT
+    fi
+  done  &&
+  ldconfig $PROTECT
+ }
+fi
+
+# some spells, such as glibc may need some special processing between calls to
+# these two fucnctions
+
+do_dispel() {
+  if  spell_ok $SPELL;  then
+    dispel  --notriggers  --nosustain $SPELL
+  fi
+}