From eab80d912a70e64dd95218390dc1221f0792505a Mon Sep 17 00:00:00 2001
From: Christian Hofstaedtler <ch@grml.org>
Date: Sat, 26 Nov 2011 16:48:05 +0100
Subject: [PATCH] Add -T option for unpacking chroot archives

---
 docs/grml-live.txt |  5 +++++
 grml-live          | 28 ++++++++++++++++++++++++++--
 2 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/docs/grml-live.txt b/docs/grml-live.txt
index a525e6e..debc706 100644
--- a/docs/grml-live.txt
+++ b/docs/grml-live.txt
@@ -208,6 +208,11 @@ debootstrap.
 Specify place of the templates used for building the ISO. By default
 (and if not manually specified) this is /usr/share/grml-live/templates/.
 
+  -T **CHROOT_ARCHIVE**::
+
+Unpack chroot tar archive before starting. Most useful in combination with
+-A and -b or -u.
+
   -u::
 
 Update existing chroot instead of rebuilding it from scratch. This option is
diff --git a/grml-live b/grml-live
index 73ee61b..3c15497 100755
--- a/grml-live
+++ b/grml-live
@@ -59,6 +59,7 @@ Usage: $PN [options, see as follows]
    -r <release_name>       release name
    -s <suite>              Debian suite; values: etch, lenny, squeeze, sid
    -t <template_directory> place of the templates
+   -T <tar_name>           unpack chroot tar archive before starting
    -u                      update existing chroot instead of rebuilding it from scratch
    -U <username>           arrange output to be owned by specified username
    -v <version_number>     specify version number of the release
@@ -298,7 +299,7 @@ fi
 # }}}
 
 # command line parsing {{{
-while getopts "a:C:c:d:D:g:i:I:o:r:s:t:U:v:AbBFnNquVz" opt; do
+while getopts "a:C:c:d:D:g:i:I:o:r:s:t:T:U:v:AbBFnNquVz" opt; do
   case "$opt" in
     a) ARCH="$OPTARG" ;;
     A) PACK_ARTIFACTS=1 ;;
@@ -318,6 +319,7 @@ while getopts "a:C:c:d:D:g:i:I:o:r:s:t:U:v:AbBFnNquVz" opt; do
     r) RELEASENAME="$OPTARG" ;;
     s) SUITE="$OPTARG" ;;
     t) TEMPLATE_DIRECTORY="$OPTARG";;
+    T) UNPACK_CHROOT="$(readlink -f $OPTARG)" ;;
     v) VERSION="$OPTARG" ;;
     F) FORCE=1 ;;
     u) UPDATE=1 ;;
@@ -395,6 +397,7 @@ if [ -z "$FORCE" ] ; then
    [ -n "$CONFIG" ]              && echo "  Configuration:     $CONFIG"
    [ -n "$GRML_FAI_CONFIG" ]     && echo "  Config directory:  $GRML_FAI_CONFIG"
    echo "  main directory:    $OUTPUT"
+   [ -n "$UNPACK_CHROOT" ]       && echo "  Chroot from:       $UNPACK_CHROOT"
    [ -n "$CHROOT_OUTPUT" ]       && echo "  Chroot target:     $CHROOT_OUTPUT"
    [ -n "$BUILD_OUTPUT" ]        && echo "  Build target:      $BUILD_OUTPUT"
    [ -n "$ISO_OUTPUT" ]          && echo "  ISO target:        $ISO_OUTPUT"
@@ -444,7 +447,6 @@ if [ -n "${PACK_ARTIFACTS}" ]; then
   [ -n "${BUILD_OUTPUT}"   -a -d "${BUILD_OUTPUT}"   ] && rm -r "${BUILD_OUTPUT}"
   [ -n "${ISO_OUTPUT}"     -a -d "${ISO_OUTPUT}"     ] && rm -r "${ISO_OUTPUT}"
   [ -n "${LOG_OUTPUT}"     -a -d "${LOG_OUTPUT}"     ] && rm -r "${LOG_OUTPUT}"
-  [ -n "${CHROOT_ARCHIVE}" -a -f "${CHROOT_ARCHIVE}" ] && rm "${CHROOT_ARCHIVE}"
 fi
 # }}}
 
@@ -501,6 +503,28 @@ log "$CMDLINE"
 einfo "Logging actions to logfile $LOGFILE"
 # }}}
 
+# unpack chroot {{{
+if [ -n "${UNPACK_CHROOT}" ]; then
+  log "Unpacking chroot from ${UNPACK_CHROOT}"
+  einfo "Unpacking chroot from ${UNPACK_CHROOT}"
+  [ -d "$CHROOT_OUTPUT" ] || mkdir -p "${CHROOT_OUTPUT}"
+  tar -xf "${UNPACK_CHROOT}" -C "${CHROOT_OUTPUT}/" --strip-components 1 | RC=$?
+  echo $RC
+  if [ "$RC" != 0 ] ; then
+    eend 1
+    bailout 1
+  fi
+  eend 0
+fi
+# }}}
+
+# cleanup CHROOT_ARCHIVE now {{{
+if [ -n "${PACK_ARTIFACTS}" ]; then
+  # can't do this earlier, as UNPACK_CHROOT might point to CHROOT_ARCHIVE
+  [ -n "${CHROOT_ARCHIVE}" -a -f "${CHROOT_ARCHIVE}" ] && rm "${CHROOT_ARCHIVE}"
+fi
+# }}}
+
 # on-the-fly configuration {{{
 if [ -n "$FAI_DEBOOTSTRAP" ] ; then
   sed "s#^FAI_DEBOOTSTRAP=.*#FAI_DEBOOTSTRAP=\"$FAI_DEBOOTSTRAP\"#" "$NFSROOT_CONF" | sponge "$NFSROOT_CONF"
-- 
2.1.4