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summary: mimic test for the hole-poking code in snap-update-ns
details: |
When snap-confine cannot create a mount point because of read-only
filesystem it will use a "writable mimic" constructed out of tmpfs and a
farm of bind mounts. This test contains a mimic snap that has various
kinds of elements that must be correctly handled by the mimic code.
environment:
PLUG: test-snapd-content-mimic-plug:content
SLOT: test-snapd-content-mimic-slot:content
prepare: |
"$TESTSTOOLS"/snaps-state install-local test-snapd-content-mimic-plug
"$TESTSTOOLS"/snaps-state install-local test-snapd-content-mimic-slot
execute: |
# Before the content interface is connected we expect to see certain files
# in the $SNAP directory. Those files represent various kinds of filesystem
# entries that should be correctly replicated inside the mimic.
check_existing_files() {
#shellcheck disable=SC2016
test-snapd-content-mimic-plug.sh -c 'test -f $SNAP/file'
#shellcheck disable=SC2016
test-snapd-content-mimic-plug.sh -c 'test -d $SNAP/dir'
#shellcheck disable=SC2016
test-snapd-content-mimic-plug.sh -c 'test -h $SNAP/symlink'
#shellcheck disable=SC2016
test-snapd-content-mimic-plug.sh -c 'cat $SNAP/file' | MATCH 'content-of-file'
#shellcheck disable=SC2016
test-snapd-content-mimic-plug.sh -c 'ls $SNAP/dir' | MATCH 'stuff-in-dir'
#shellcheck disable=SC2016
test-snapd-content-mimic-plug.sh -c 'readlink $SNAP/symlink' | MATCH 'symlink-target'
}
echo "Check the real thing, before a mimic is established."
check_existing_files
# Connect the content interface which will make $SNAP/content show up (TIP:
# it's not in the snap! It's added dynamically at runtime). Not only we get
# access to the new things (we'll check those shortly) but we also retain
# access to the same old stuff that was there before.
#shellcheck disable=SC2016
test-snapd-content-mimic-plug.sh -c 'test ! -e $SNAP/content'
echo "When we connect the interface"
snap connect "$PLUG" "$SLOT"
echo "Check we see shared content inside the newly created directory"
check_existing_files
#shellcheck disable=SC2016
test-snapd-content-mimic-plug.sh -c 'test -d $SNAP/content'
#shellcheck disable=SC2016
test-snapd-content-mimic-plug.sh -c 'test -e $SNAP/content/canary'
echo "When we disconnect the interface"
snap disconnect "$PLUG" "$SLOT"
echo "The content interface is fully undoable so all the shared content goes away without a trace."
check_existing_files
#shellcheck disable=SC2016
test-snapd-content-mimic-plug.sh -c 'test ! -e $SNAP/content'
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