selfstrap: set up /var/lib/dpkg/tmp.ci before running inst scripts

1 files changed, 19 insertions, 0 deletions

diff --git a/src/selfstrap b/src/selfstrap
index 9c43f2d..265fa25 100755
--- a/src/selfstrap
+++ b/src/selfstrap
@@ -254,6 +254,21 @@ verbosely()
     fi
 }
 
+remove_tmp_ci()
+{
+    [ ! -e "$TARGET"/var/lib/dpkg/tmp.ci ] || rm -r "$TARGET"/var/lib/dpkg/tmp.ci
+}
+
+# /var/lib/dpkg/tmp.ci/control is read by debconf to determine the owner package
+# See `grep -A3 control /usr/share/debconf/frontend`
+extract_tmp_ci()
+{
+    local deb="$1"
+    remove_tmp_ci
+    mkdir "$TARGET"/var/lib/dpkg/tmp.ci
+    dpkg --ctrl-tarfile "$deb" | tar -C "$TARGET"/var/lib/dpkg/tmp.ci -x
+}
+
 dpkg_configure_from_apt_actions()
 {
     while read line; do
@@ -267,14 +282,18 @@ dpkg_configure_from_apt_actions()
                 export DPKG_MAINTSCRIPT_NAME=preinst
                 preinst=/var/lib/dpkg/info/${package}${multiarch}.preinst
                 if [ -x "$TARGET"/"$preinst" ]; then
+                    extract_tmp_ci "$deb"
                     verbosely ${CHROOT_PROG:-chroot} "$TARGET" "$preinst" install
+                    remove_tmp_ci
                 fi
                 ;;
             Conf)
                 export DPKG_MAINTSCRIPT_NAME=postinst
                 postinst=/var/lib/dpkg/info/${package}${multiarch}.postinst
                 if [ -x "$TARGET"/"$postinst" ]; then
+                    extract_tmp_ci "$deb"
                     verbosely ${CHROOT_PROG:-chroot} "$TARGET" "$postinst" configure
+                    remove_tmp_ci
                 fi
                 ;;
             Remv) ;;