qa/standalone/osd/pg-merge.sh: add merge vs pg import test

- You can't import the source half a PG that's since merged.  Sorry!  We
could implement this later.
- You can import the target half, but the result will then be incomplete,
and you rely on backfill to clean it up.
- Map gaps don't affect this behavior.

Signed-off-by: Sage Weil <sage@redhat.com>

qa/standalone/osd/pg-merge.sh

@@ -0,0 +1,80 @@
+#!/usr/bin/env bash
+source $CEPH_ROOT/qa/standalone/ceph-helpers.sh
+
+function run() {
+    local dir=$1
+    shift
+
+    export CEPH_MON="127.0.0.1:7147" # git grep '\<7147\>' : there must be only one
+    export CEPH_ARGS
+    CEPH_ARGS+="--fsid=$(uuidgen) --auth-supported=none "
+    CEPH_ARGS+="--mon-host=$CEPH_MON --mon_min_osdmap_epochs=50 --paxos_service_trim_min=10"
+
+    local funcs=${@:-$(set | sed -n -e 's/^\(TEST_[0-9a-z_]*\) .*/\1/p')}
+    for func in $funcs ; do
+        $func $dir || return 1
+    done
+}
+
+function TEST_import_after_merge_and_gap() {
+    local dir=$1
+
+    setup $dir || return 1
+    run_mon $dir a --osd_pool_default_size=2 || return 1
+    run_mgr $dir x || return 1
+    run_osd $dir 0 || return 1
+    run_osd $dir 1 || return 1
+
+    ceph osd pool create foo 2 || return 1
+    wait_for_clean || return 1
+    rados -p foo bench 3 write -b 1024 --no-cleanup || return 1
+
+    kill_daemons $dir TERM osd.0
+    ceph-objectstore-tool --data-path $dir/0 --op export --pgid 1.1 --file $dir/1.1  --force
+    ceph-objectstore-tool --data-path $dir/0 --op export --pgid 1.0 --file $dir/1.0  --force
+    activate_osd $dir 0 || return 1
+
+    bin/ceph osd pool set foo pg_num 1
+    sleep 5
+    wait_for_clean || return 1
+
+    #
+    kill_daemons $dir TERM osd.0
+    ceph-objectstore-tool --data-path $dir/0 --op remove --pgid 1.0 --force || return 1
+    # this will import half the original pg
+    ceph-objectstore-tool --data-path $dir/0 --op import --pgid 1.0 --file $dir/1.0 || return 1
+    # we disallow import of 1.1 since it doesn't logically exist anymore.
+    # ceph-objectstore-tool --data-path $dir/0 --op import --pgid 1.1 --file $dir/1.1 || return 1
+    activate_osd $dir 0 || return 1
+
+    wait_for_clean || return 1
+
+    # make a map gap
+    for f in `seq 1 50` ; do
+	ceph osd set nodown
+	ceph osd unset nodown
+    done
+    wait_for_clean || return 1
+    ceph osd osd down 0
+    sleep 3
+    wait_for_clean || return 1
+
+    kill_daemons $dir TERM osd.0
+
+    # this should fail.. 1.1 still doesn't exist
+    ceph-objectstore-tool --data-path $dir/0 --op import --pgid 1.1 --file $dir/1.1 && echo expected failure && return 1
+
+    # this should not
+    ceph-objectstore-tool --data-path $dir/0 --op remove --pgid 1.0 --force || return 1
+    ceph-objectstore-tool --data-path $dir/0 --op import --pgid 1.0 --file $dir/1.0 || return 1
+
+    activate_osd $dir 0 || return 1
+
+    wait_for_clean || return 1
+}
+
+main pg-merge "$@"
+
+# Local Variables:
+# compile-command: "cd ../.. ; make -j4 && test/osd/pg-merge.sh"
+# End: