Add fixture update helper (prometheus#1551)

* Add makefile target to update sysfs fixtures.
* Use similar style for fixtures from procfs.
* Re-pack fixtures ttar file.

Signed-off-by: Ben Kochie <superq@gmail.com>

Makefile

@@ -91,12 +91,16 @@ test-32bit: collector/fixtures/sys/.unpacked
 skip-test-32bit:
 	@echo ">> SKIP running tests in 32-bit mode: not supported on $(GOHOSTOS)/$(GOHOSTARCH)"
 
-collector/fixtures/sys/.unpacked: collector/fixtures/sys.ttar
-	@echo ">> extracting sysfs fixtures"
-	if [ -d collector/fixtures/sys ] ; then rm -r collector/fixtures/sys ; fi
-	./ttar -C collector/fixtures -x -f collector/fixtures/sys.ttar
+%/.unpacked: %.ttar
+	@echo ">> extracting fixtures"
+	if [ -d $(dir $@) ] ; then rm -r $(dir $@) ; fi
+	./ttar -C $(dir $*) -x -f $*.ttar
 	touch $@
 
+update_fixtures:
+	rm -vf collector/fixtures/sys/.unpacked
+	./ttar -C collector/fixtures -c -f collector/fixtures/sys.ttar sys
+
 .PHONY: test-e2e
 test-e2e: build collector/fixtures/sys/.unpacked
 	@echo ">> running end-to-end tests"

collector/fixtures/sys.ttar

@@ -298,11 +298,6 @@ Lines: 1
 0
 Mode: 644
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-Path: sys/class/infiniband/mlx4_0/ports/1/counters/port_xmit_discards
-Lines: 1
-0
-Mode: 644
-# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Path: sys/class/infiniband/mlx4_0/ports/1/counters/port_rcv_errors
 Lines: 1
 0
@@ -1278,15 +1273,16 @@ Path: sys/class/power_supply/BAT0/voltage_now
 Lines: 1
 11660000
 Mode: 444
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Directory: sys/class/thermal
 Mode: 755
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-Path: sys/class/thermal/thermal_zone0
-SymlinkTo: ../../devices/virtual/thermal/thermal_zone0
-# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Path: sys/class/thermal/cooling_device0
 SymlinkTo: ../../devices/virtual/thermal/cooling_device0
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+Path: sys/class/thermal/thermal_zone0
+SymlinkTo: ../../devices/virtual/thermal/thermal_zone0
+# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 Directory: sys/devices
 Mode: 755
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -3200,7 +3196,3 @@ Lines: 1
 20
 Mode: 644
 # ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-Path: sys/.unpacked
-Lines: 0
-Mode: 644
-# ttar - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -