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[Qemu-devel] [PATCH v3 4/5] build: don't fail if given a git submodule w

From: Daniel P. Berrange
Subject: [Qemu-devel] [PATCH v3 4/5] build: don't fail if given a git submodule which does not exist
Date: Fri, 3 Nov 2017 15:33:32 +0000

If going back in time in git history, across a commit that introduces a new
submodule, the 'git-submodule.sh' script will fail, causing rebuild to fail.

This is because config-host.mak contains a GIT_SUBMODULES variable that lists
a submodule that only exists in the later commit. config-host.mak won't get
repopulated until config.status is invoked, but make won't get this far due to
the submodule error.

This change makes 'git-submodule.sh' check whether each module is known to git
and drops any which are not present. A warning message will be printed when any
submodule is dropped in this manner.

Signed-off-by: Daniel P. Berrange <address@hidden>
 scripts/git-submodule.sh | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/scripts/git-submodule.sh b/scripts/git-submodule.sh
index 63ace6fc55..2857fc57c4 100755
--- a/scripts/git-submodule.sh
+++ b/scripts/git-submodule.sh
@@ -7,7 +7,7 @@ substat=".git-submodule-status"
 test -z "$GIT" && GIT=git
@@ -33,12 +33,24 @@ error() {
     exit 1
-if test -z "$modules"
+if test -z "$maybe_modules"
     test -e $substat || touch $substat
     exit 0
+for m in $maybe_modules
+    $GIT submodule status $m 1> /dev/null 2>&1
+    if test $? = 0
+    then
+        modules="$modules $m"
+    else
+        echo "warn: ignoring non-existant submodule $m"
+    fi
 if ! test -e ".git"
     echo "$0: unexpectedly called with submodules but no git checkout exists"

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