1 files changed, 89 insertions, 0 deletions
diff --git a/examples/main.sh b/examples/main.sh
new file mode 100755
index 0000000..082576a
--- /dev/null
+++ b/examples/main.sh
@@ -0,0 +1,89 @@
+#!/bin/bash
+readonly image=../scratch/dump-zero.img
+
+######################################################################
+
+set -e
+
+run-btrfs-rec() {
+	local tgt=$1; shift
+	local log=${tgt%.*}.log
+	if test -s "$tgt"; then
+		return
+	fi
+	{
+		set -x;
+		command time --verbose \
+			./bin/btrfs-rec \
+			--pv="$image" \
+			--profile.cpu="${tgt%.*}.cpu.pprof" \
+			--profile.allocs="${tgt%.*}.allocs.pprof" \
+			"$@"
+	} >"$tgt" 2> >(tee >&2 "$log")
+}
+
+set -x
+make build
+gendir="${image%.img}.gen"
+mkdir -p "$gendir"
+export GOMEMLIMIT="$(awk '/^MemTotal:/{ print $2 "KiB" }' </proc/meminfo)"
+{ set +x; } &>/dev/null
+
+######################################################################
+
+# 0: initial scan ##########################################
+
+run-btrfs-rec $gendir/0.scandevices.json \
+    inspect rebuild-mappings scan
+run-btrfs-rec $gendir/0.nodes.json \
+    inspect rebuild-mappings list-nodes $gendir/0.scandevices.json
+
+# 1-2: rebuild chunk/dev-ext/blockgroup trees ##############
+
+run-btrfs-rec $gendir/1.mappings.json \
+    inspect rebuild-mappings process $gendir/0.scandevices.json
+
+# 1.mappings.log says:
+#
+#     detailed report:
+#     ... unmapped physical region: dev=1 beg=0x0000000000000000 end=0x0000000000100000 (size=0x0000000000100000)
+#     ... unmapped physical region: dev=1 beg=0x0000000000500000 end=0x0000000001500000 (size=0x0000000001000000)
+#     ... unmapped physical region: dev=1 beg=0x0000003b9e650000 end=0x0000003b9e656000 (size=0x0000000000006000)
+#     ... umapped summed logical region:  beg=0x0000000000d00000 end=0x0000000001500000 (size=0x0000000000800000)
+#     ... umapped block group:            beg=0x0000000000500000 end=0x0000000000d00000 (size=0x0000000000800000) flags=METADATA|single
+#     ... umapped block group:            beg=0x0000000000d00000 end=0x0000000001500000 (size=0x0000000000800000) flags=DATA|single
+#
+# Those 2 block groups clearly both slot in to that 2nd physical
+# region (which is roughly beg=5MB end=22MB).  Since that whole
+# region's data was lost (roughly the 1st 100MB was lost), it doesn't
+# matter which order we put the 2 block groups in within that physical
+# region.  So just put them in laddr order.
+#
+# And then run that through `rebuild-mappings process` again to fill in the
+# flags and normalize it.
+run-btrfs-rec $gendir/2.mappings.json \
+    --mappings=<(sed <$gendir/1.mappings.json \
+      -e '2a{"LAddr":5242880,"PAddr":{"Dev":1,"Addr":5242880},"Size":1},' \
+      -e '2a{"LAddr":13631488,"PAddr":{"Dev":1,"Addr":13631488},"Size":1},') \
+    inspect rebuild-mappings process $gendir/0.scandevices.json
+
+# 3: rebuild other trees ###################################
+
+run-btrfs-rec $gendir/3.trees.json \
+    --mappings=$gendir/2.mappings.json \
+    --node-list=$gendir/0.nodes.json \
+    inspect rebuild-trees
+
+# 4: dump data from the FS #################################
+
+run-btrfs-rec $gendir/4.ls-files.txt \
+    --mappings=$gendir/2.mappings.json \
+    --node-list=$gendir/0.nodes.json \
+    --trees=$gendir/3.trees.json \
+    inspect ls-files
+
+run-btrfs-rec $gendir/4.ls-trees.txt \
+    --mappings=$gendir/2.mappings.json \
+    --node-list=$gendir/0.nodes.json \
+    --trees=$gendir/3.trees.json \
+    inspect ls-trees