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* tets: test details part 15 This is the last set of test details * Update tests/main/snapshot-basic/task.yaml Co-authored-by: Andrew Phelps <136256549+andrewphelpsj@users.noreply.github.com> --------- Co-authored-by: Andrew Phelps <136256549+andrewphelpsj@users.noreply.github.com>
203 lines
8.1 KiB
YAML
203 lines
8.1 KiB
YAML
summary: Check that the basic snapshots functionality is ok
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details: |
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A snapshot is a copy of the user, system and configuration data stored
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by snapd for one or more snaps on your system. This data can be found
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in $HOME/snap/<snap-name> and /var/snap/<snap-name>.
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Snapshots are generated manually with the snap save command and
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automatically when a snap is removed (unless --purge is used with
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remove, in which case no snapshot is created).
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Having few snaps installed in the system, this test checks that
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`snap save` command shows the created snapshots for the snaps. Then it runs
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`snap check-snapshot` to check the snapshot created for the snaps are
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valid. Finally, it verifies that the snapshots can be exported and restored
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(the data is restored properly) and removed by running `snap forget` command.
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environment:
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# tar invoked when creating snapshots triggers OOM
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SNAPD_NO_MEMORY_LIMIT: 1
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prepare: |
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snap install test-snapd-sh
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snap install --edge test-snapd-just-edge
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snap install --edge test-snapd-tools
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restore: |
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rm -f /var/snap/test-snapd-tools/common/huge
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debug: |
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snap list || true
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snap info core || true
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snap saved || true
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execute: |
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# use the snaps, so they create the dirs:
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test-snapd-sh.sh -c 'true'
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test-snapd-just-edge.snap-name >/dev/null
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# drop in canaries:
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for snap in test-snapd-sh test-snapd-just-edge; do
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echo "hello versioned $snap" > ~/snap/$snap/current/canary.txt
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echo "hello common $snap" > ~/snap/$snap/common/canary.txt
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done
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# create snapshot, grab its ID
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SET_ID=$( snap save test-snapd-sh test-snapd-just-edge | cut -d\ -f1 | tail -n1 )
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# check it includes both snaps
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snap saved | MATCH test-snapd-sh
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snap saved | MATCH test-snapd-just-edge
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snap saved --id="$SET_ID" | grep test-snapd-sh
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snap saved --id="$SET_ID" | grep test-snapd-just-edge
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# and is valid
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snap check-snapshot "$SET_ID"
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# and is exportable
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snap export-snapshot "$SET_ID" "${SET_ID}_export.snapshot"
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test -e "${SET_ID}_export.snapshot"
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test "$( tar -tvf "${SET_ID}_export.snapshot" | wc -l )" = "4"
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# do it again and ensure it has the files have the same size
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snap export-snapshot "$SET_ID" "${SET_ID}_export-2.snapshot"
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test "$( tar -tvf "${SET_ID}_export-2.snapshot" | wc -l )" = "4"
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s1="$(stat -c%s "${SET_ID}_export.snapshot" )"
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s2="$(stat -c%s "${SET_ID}_export-2.snapshot" )"
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test "$s1" = "$s2"
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echo "and the same files are snapshoted"
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f1="$(tar -tf "${SET_ID}_export.snapshot" )"
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f2="$(tar -tf "${SET_ID}_export-2.snapshot" )"
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test "$f1" = "$f2"
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# remove the canaries
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rm ~/snap/*/{current,common}/canary.txt
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# restore one of them
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snap restore "$SET_ID" test-snapd-sh
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test -e ~/snap/test-snapd-sh/current/canary.txt
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test -e ~/snap/test-snapd-sh/common/canary.txt
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# it didn't restore the other one
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test ! -e ~/snap/test-snapd-just-edge/current/canary.txt
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test ! -e ~/snap/test-snapd-just-edge/common/canary.txt
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# restore the other
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snap restore "$SET_ID" test-snapd-just-edge
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# now check everything's as we expect
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for snap in test-snapd-sh test-snapd-just-edge; do
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test "$( cat ~/snap/$snap/current/canary.txt )" = "hello versioned $snap"
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test "$( cat ~/snap/$snap/common/canary.txt )" = "hello common $snap"
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done
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# check removal works
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snap forget "$SET_ID"
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snap saved --id="$SET_ID" | grep "No snapshots found"
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echo "Check import fails if snapshot contains invalid filenames"
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# trusty (14.04) relpath does not support --relative-to
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if ! os.query is-trusty; then
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fname=$(mktemp /tmp/1_XXXX)
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relpath=$(realpath --relative-to="$(pwd)" "$fname")
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cp "${SET_ID}_export.snapshot" "${SET_ID}_export.snapshot.invalid"
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tar --update -f "${SET_ID}_export.snapshot.invalid" -P "$relpath"
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# remove the file so we can check that the file does not get created when
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# snapshot import fails
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rm "$fname"
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snap import-snapshot "${SET_ID}_export.snapshot.invalid" && exit 1
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test ! -e "$fname"
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rm "${SET_ID}_export.snapshot.invalid"
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fi
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echo "Check that import works"
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RESTORE_ID=$( snap import-snapshot "${SET_ID}_export.snapshot" | head -n1 | cut -f2 -d'#' )
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echo "And is valid"
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snap check-snapshot "$RESTORE_ID"
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NUM_SAVED=$(snap saved | wc -l)
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echo "Import again doesn't create a duplicated snapshot"
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IMPORTED_ID=$( snap import-snapshot "${SET_ID}_export-2.snapshot" | head -n1 | cut -f2 -d'#' )
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[[ "$RESTORE_ID" == "$IMPORTED_ID" ]]
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[[ "$NUM_SAVED" == $(snap saved | wc -l) ]]
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snap forget "$RESTORE_ID"
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echo "Import re-creates snapshots directory if misssing"
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# precondition check
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test -d /var/lib/snapd/snapshots
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rm -rf /var/lib/snapd/snapshots
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RESTORE_ID=$( snap import-snapshot "${SET_ID}_export.snapshot" | head -n1 | cut -f2 -d'#' )
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# remove the exports and import
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rm "${SET_ID}"_export*.snapshot
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snap forget "$RESTORE_ID"
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# check automatic snapshot can be disabled
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snap set core snapshots.automatic.retention=no
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snap remove test-snapd-sh
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if snap saved | MATCH "test-snapd-sh"; then
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echo "did not expect a snapshot for test-snapd-sh"
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exit 1
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fi
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# re-enable snapshots, check automatic snapshot is created on snap remove
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snap install test-snapd-sh
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snap set core snapshots.automatic.retention=30h
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snap remove test-snapd-sh
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snap saved test-snapd-sh | MATCH "auto"
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SET_ID=$( snap saved test-snapd-sh | cut -d\ -f1 | tail -n1 )
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snap forget "$SET_ID"
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# removing with --purge doesn't create automatic snapshot
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snap set core snapshots.automatic.retention=30h
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snap install test-snapd-sh
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snap remove --purge test-snapd-sh
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if snap saved test-snapd-sh | MATCH "auto" ; then
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echo "automatic snapshot is not expected"
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exit 1
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fi
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# check validation of the automatic snapshot expiration range
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(snap set core snapshots.automatic.retention=1s 2>&1 || true) | MATCH "must be"
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# check that expiration can be read back
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snap get core snapshots.automatic.retention | MATCH "30h"
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snap get core -d snapshots.automatic | MATCH '"retention"'
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# check memory usage for larger snap snapshot data exporting
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mkdir -p /var/snap/test-snapd-tools/common/
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dd if=/dev/urandom of=/var/snap/test-snapd-tools/common/huge bs=1M count=100
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# create snapshot, grab its ID
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SET_ID=$( snap save test-snapd-tools | cut -d\ -f1 | tail -n1 )
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snap saved --id="$SET_ID" | grep test-snapd-tools
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snap check-snapshot "$SET_ID"
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# export the large snap and record memory usage
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"$TESTSTOOLS"/memory-observe-do -o memory-kb.txt snap export-snapshot \
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"$SET_ID" "${SET_ID}_export.snapshot"
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test -e "${SET_ID}_export.snapshot"
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# Ensure our snapshot export file is at least 50MB. The data we created
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# is 100MB of randomness so even with amazing compression we should never
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# have a smaller file
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test "$(stat -c%s "${SET_ID}_export.snapshot")" -gt 50000000
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# the io.Copy uses a 32k buffer, so extra memory usage should be limited.
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# The threshold in this test is set to about 40MB
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test "$(cat memory-kb.txt)" -lt 40000
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# check that snapshot set id from the filename has authority
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snap install test-snapd-sh
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snap save test-snapd-sh
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SNAPSHOT_FILE=$(ls /var/lib/snapd/snapshots/*test-snapd-sh*.zip)
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NEWSNAPSHOT_FILE=$(echo "$SNAPSHOT_FILE" | sed -e's/[1-9]\+_/123_/')
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# rename the snapshot file to force a new set id.
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mv "$SNAPSHOT_FILE" "$NEWSNAPSHOT_FILE"
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snap saved | MATCH "123 +test-snapd-sh"
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# make sure there is just one such snapshot
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[[ $(snap saved | grep -c test-snapd-sh) == "1" ]]
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snap saved --id=123 | MATCH "123 .+test-snapd-sh"
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snap restore 123 test-snapd-sh
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# snap configuration should work after restoring snapshots that didn't
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# have config (LP #1917870).
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"$TESTSTOOLS"/snaps-state install-local test-snap
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SET_ID=$( snap save test-snap | cut -d\ -f1 | tail -n1 )
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snap restore "$SET_ID"
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snap set test-snap foo=baz
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snap get test-snap foo | MATCH "baz"
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