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# Scenario step implementations
This chapter has implementations of scenario steps used elsewhere in
this document.
## Should a scenario be run?
We provide a way to control which classes of scenarios get run. This
is done by passing in an environment variable `TESTS` to vmdebootstrap
(`--env` option), with a comma-separated list of classes:
* `fast`---run fast tests
* `build`---run scenarios that do builds
If `TESTS` is not set, everything gets run.
Scenarios can use the ASSUMING statements defined here to let the user
to allow them to run or not to run.
IMPLEMENTS ASSUMING build tests are requested
test_requested build
## Building an image
To keep individual steps shorter, we provide some steps to set common
parts, such as the name of the image being built.
IMPLEMENTS GIVEN user wants to build an image (\S+) that is (\S+) in size
remember_setting IMAGE "$MATCH_1"
remember_setting IMAGE_SIZE "$(size_in_bytes "$MATCH_2")"
Actually build an image. This looks like it can invoke any command,
but it's actually restricted to vmdebootstrap in the source tree.
IMPLEMENTS WHEN the user runs vmdebootstrap (.*)
PYTHONPATH="$SRCDIR" "$SRCDIR/bin/vmdebootstrap" \
--image "$IMAGE" \
--size "$IMAGE_SIZE" \
$MATCH_1
## Static tests on disk images
The steps in this section do static tests of disk image. These all
operate on the image specified in the step "GIVEN user wants to
build...".
Test the size of an image. This tests the length, not disk usage, of
the image.
IMPLEMENTS THEN the image has the correct size
actual="$(stat -c %s "$IMAGE")"
[ "$actual" = "$IMAGE_SIZE" ]
Check the partition table on the image.
IMPLEMENTS THEN the image has one partition
parted --script "$IMAGE" print |
sed '1,/^Number/d' |
grep -c . |
grep -Fx 1
Check partition boot flag.
IMPLEMENTS THEN partition (\d+) has the boot flag set
parted --script "$IMAGE" print |
awk -v "PART=$MATCH_1" '/^ [0-9]+ / && $1 == PART && $7 == "boot"' |
grep .
Check filesystem on a partition. This checks the actual filesystem,
not a type declared in the partition table.
IMPLEMENTS THEN partition (\d+) has an? (\S+) filesystem
device="$(kpartx_image_partition "$IMAGE" "$MATCH_1")"
trap "unkpartx_image \"$IMAGE\"" EXIT
blkid "$device" | grep "TYPE=\"$MATCH_2\""
Check that the partition contains a file with some content matching a
regular expression.
IMPLEMENTS THEN partition (\d+) has file (\S+) matching (.+)
device="$(kpartx_image_partition "$IMAGE" "$MATCH_1")"
trap "unkpartx_image \"$IMAGE\"" EXIT
mp="$(mktemp -d)"
mount -r "$device" "$mp"
trap "umount \"$mp\"; unkpartx_image \"$IMAGE\"" EXIT
grep -P -e "$MATCH_3" "$mp/$MATCH_2"
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