dpdk/config.xml: Resolve series dependency.

Proposed patches in DPDK may have dependency on other work in progress
series.
This is described in DPDK contributing guide [1].

For now, only handle a series dependency.

Trying to resolve series dependencies might be too complex, but we can
rely on the dependency previous submission being already referenced in
the upload repository.

1: https://doc.dpdk.org/guides/contributing/patches.html#patch-dependencies

Note: this is an untested patch so it is probably broken.
I am unsure how I could try it safely, but posting as a kind of RFC.

Signed-off-by: David Marchand <david.marchand@redhat.com>

3rd-party/dpdk/config.xml

@@ -125,8 +125,8 @@ curl -s -f "$SERIES_URL" > info.json
 
 COVER_LETTER_URL=$(jq -rc '.cover_letter.url' info.json)
 if [ "$COVER_LETTER_URL" != "null" ]; then
-	    COVER_LETTER_MBOX=$(jq -rc '.mbox' info.json)
-        curl -s -f "$COVER_LETTER_MBOX" -o "cover_letter.info"
+    COVER_LETTER_MBOX=$(jq -rc '.mbox' info.json)
+    curl -s -f "$COVER_LETTER_MBOX" -o "cover_letter.info"
 fi
 
 for patch in $(jq -rc '.patches[].url' info.json); do
@@ -165,6 +165,23 @@ curl -s -o checkpatch.pl 'https://raw.githubusercontent.com/torvalds/linux/
 chmod 755 checkpatch.pl
 echo 'DPDK_CHECKPATCH_PATH=./checkpatch.pl' > .develconfig
 
+# this series may have a dependency, check the cover letter or the first patch
+if [ -f cover_letter.info ]; then
+   dependency=$(sed -ne "s/^Depends-on: series-\([0-9]*\)/\1/p" cover_letter.info)
+fi
+if [ -z "$dependency" ]; then
+   dependency=$(sed -ne "s/^Depends-on: series-\([0-9]*\)/\1/p" 0001.patch)
+fi
+
+if [ -n "$dependency" ]; then
+   git reset --hard upload_repo/series_$dependency 2>&1 | tee tmp.gitreset.log
+   if egrep -i 'fatal' tmp.gitreset.log >/dev/null 2>&1; then
+      echo "" >> ERRORS.log
+      echo "git-reset:" >> ERRORS.log
+      cat tmp.gitreset.log >> ERRORS.log
+   fi
+fi
+
 exit_status=0
 for patch in *.patch; do
    PATCH_SUBJECT=$(git mailinfo /dev/null /dev/null < $patch | grep Subject: | sed 's@Subject: @@')