test: add explicit test for seed

The test checks if the seed is fully reliable and sufficient as a chunk
store: it packs up a tree, then removes the chunk store, but retaining
hte original tree to us as seed in place ot the chunk store.

Author: poettering

meson.build

@@ -313,6 +313,14 @@ test_cache = find_program(test_cache_sh)
 test('test-cache.sh', test_cache,
      timeout : 30 * 60)
 
+test_seed_sh = configure_file(
+        output : 'test-seed.sh',
+        input : 'test/test-seed.sh.in',
+        configuration : substs)
+test_seed = find_program(test_seed_sh)
+test('test-seed.sh', test_seed,
+     timeout : 30 * 60)
+
 udev_rule = configure_file(
           output : '75-casync.rules',
           input : 'src/75-casync.rules.in',

test/test-seed.sh.in

@@ -0,0 +1,26 @@
+#!/bin/bash
+
+set -ex
+
+SCRATCH_DIR=${TMPDIR:-/var/tmp}/test-casync.$RANDOM
+mkdir -p $SCRATCH_DIR/src
+
+mkdir $SCRATCH_DIR/src/casync
+if [ $UID = 0 ]; then
+    cp -a @top_srcdir@/{test-files,src} $SCRATCH_DIR/src/casync/
+else
+    # If we lack privileges we use rsync rather than cp to copy, as it will just skip over device nodes
+    rsync -a --exclude=.cacac @top_srcdir@/{test-files,src} $SCRATCH_DIR/src/casync/
+fi
+
+cd $SCRATCH_DIR/src
+
+@top_builddir@/casync make -v $SCRATCH_DIR/test.caidx
+@top_builddir@/casync extract -v $SCRATCH_DIR/test.caidx $SCRATCH_DIR/first
+@top_builddir@/casync extract -v --seed=$SCRATCH_DIR/src $SCRATCH_DIR/test.caidx $SCRATCH_DIR/second
+
+# Now, let's flush out the chunk store. If everything works correctly, the seed
+# should be sufficient as a source for chunks
+rm -rf $SCRATCH_DIR/default.castr/*
+
+@top_builddir@/casync extract -v --seed=$SCRATCH_DIR/src $SCRATCH_DIR/test.caidx $SCRATCH_DIR/third