migration/postcopy: break the loop when there is no more page to discard

[mirror_qemu.git] / scripts / git-submodule.sh

diff --git a/scripts/git-submodule.sh b/scripts/git-submodule.sh
index d8fbc7e47e0c64a802ae7871fa18e81a6e458b9f..98ca0f2737abdb8aa10d3c4d14e169877c16babd 100755 (executable)
--- a/scripts/git-submodule.sh
+++ b/scripts/git-submodule.sh
@@ -3,21 +3,49 @@
 # This code is licensed under the GPL version 2 or later.  See
 # the COPYING file in the top-level directory.
 
-set -e
-
 substat=".git-submodule-status"
 
 command=$1
 shift
-modules="$@"
+maybe_modules="$@"
 
-if test -z "$modules"
-then
-    test -e $substat || touch $substat
-    exit 0
-fi
+test -z "$GIT" && GIT=git
+
+error() {
+    echo "$0: $*"
+    echo
+    echo "Unable to automatically checkout GIT submodules '$modules'."
+    echo "If you require use of an alternative GIT binary (for example to"
+    echo "enable use of a transparent proxy), then please specify it by"
+    echo "running configure by with the '--with-git' argument. e.g."
+    echo
+    echo " $ ./configure --with-git='tsocks git'"
+    echo
+    echo "Alternatively you may disable automatic GIT submodule checkout"
+    echo "with:"
+    echo
+    echo " $ ./configure --disable-git-update"
+    echo
+    echo "and then manually update submodules prior to running make, with:"
+    echo
+    echo " $ scripts/git-submodule.sh update $modules"
+    echo
+    exit 1
+}
 
-if ! test -e ".git"
+modules=""
+for m in $maybe_modules
+do
+    $GIT submodule status $m 1> /dev/null 2>&1
+    if test $? = 0
+    then
+        modules="$modules $m"
+    else
+        echo "warn: ignoring non-existent submodule $m"
+    fi
+done
+
+if test -n "$maybe_modules" && ! test -e ".git"
 then
     echo "$0: unexpectedly called with submodules but no git checkout exists"
     exit 1
@@ -25,14 +53,30 @@ fi
 
 case "$command" in
 status)
+    if test -z "$maybe_modules"
+    then
+         test -s ${substat} && exit 1 || exit 0
+    fi
+
     test -f "$substat" || exit 1
-    trap "rm -f ${substat}.tmp" EXIT
-    git submodule status $modules > "${substat}.tmp"
-    diff "${substat}" "${substat}.tmp" >/dev/null
+    CURSTATUS=$($GIT submodule status $modules)
+    OLDSTATUS=$(cat $substat)
+    test "$CURSTATUS" = "$OLDSTATUS"
     exit $?
     ;;
 update)
-    git submodule update --init $modules 1>/dev/null 2>&1
-    git submodule status $modules > "${substat}"
+    if test -z "$maybe_modules"
+    then
+        test -e $substat || touch $substat
+        exit 0
+    fi
+
+    $GIT submodule update --init $modules 1>/dev/null
+    test $? -ne 0 && error "failed to update modules"
+
+    $GIT submodule status $modules > "${substat}"
+    test $? -ne 0 && error "failed to save git submodule status" >&2
     ;;
 esac
+
+exit 0