saving uncommitted changes in /etc prior to emerge run

paludis/hooks/auto_patch.bash

@@ -0,0 +1,70 @@
+#!/bin/bash
+#
+# Paludis hook script to apply patch (w/o modifying corresponding ebuild file).
+#
+# Copyright (c), 2010-2012 by Alex Turbov <i.zaufi@gmail.com>
+#
+# Version: @PH_VERSION@
+#
+
+source ${PALUDIS_EBUILD_DIR}/echo_functions.bash
+
+declare -r CONFIG_FILE="/etc/paludis/hooks/configs/auto_patch.conf"
+PATCH_DIR="/var/db/paludis/autopatches"
+# Configuration override
+[[ -f ${CONFIG_FILE} ]] && source ${CONFIG_FILE}
+
+PATCH_DIR_FULL="${PATCH_DIR}/${HOOK}/${CATEGORY}/${PF}"
+
+_ap_rememberfile="${T}/.autopatch_was_here_${PALUDIS_PID}"
+
+issue_a_warning()
+{
+    local -r tobe="$1"
+    ewarn "WARNING: ${CATEGORY}/${PF} package $tobe installed with additional patches applied by auto-patch hook."
+    ewarn "WARNING: Before filing a bug, remove all patches, reinstall, and try again..."
+}
+
+try_to_apply_patches()
+{
+    if [[ -n ${PALUDIS_HOOK_DEBUG} ]]; then
+        einfo "Check ${PATCH_DIR_FULL}"
+    fi
+    if [[ -d ${PATCH_DIR_FULL} ]] ; then
+        cd "${S}" || die "Failed to cd into ${S}!"
+        for i in "${PATCH_DIR_FULL}"/*.patch ; do
+            if declare -f epatch >/dev/null ; then
+                epatch ${i}
+            else
+                # sane default if no epatch is there
+                einfo "Applying ${i} ..."
+                patch -p1 -i "${i}" || die "Failed to apply ${i}!"
+            fi
+            touch "${_ap_rememberfile}" || die "Failed to touch ${_ap_rememberfile}!"
+        done
+        if [[ -e ${_ap_rememberfile} ]]; then
+            issue_a_warning "will be"
+        else
+            einfo "No patches in for this package."
+        fi
+    fi
+}
+
+case "${HOOK}" in
+    # ATTENTION This script must be symlinked to the following hook dirs:
+    ebuild_compile_post         | \
+    ebuild_compile_pre          | \
+    ebuild_configure_post       | \
+    ebuild_configure_pre        | \
+    ebuild_install_pre          | \
+    ebuild_unpack_post          )
+        try_to_apply_patches
+        ;;
+    install_all_post)
+        if [[ -e ${_ap_rememberfile} ]] ; then
+            issue_a_warning "was"
+        fi
+        ;;
+esac
+
+# kate: hl bash;