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summary: check the symlinks following the right track
details: |
Snapd contains logic to validate the contents of a snap to ensure that
symbolic links follow certain restrictions. The test mounts a snap with
crafted symbolic link names and targets, containing spaces and the character
sequence ->, to check that snapd is not confused by that structure, and that
after mounting, the symlinks retain their properties.
environment:
SNAP: test-snapd-validate-container-happy
prepare: |
execute: |
SNAP_MOUNT_DIR="$(os.paths snap-mount-dir)"
# We shouldn't use relative symlinks in Github as they cannot be packed correctly.
# So here let's test whether we can still pack such symlinks within a snap and use if needed.
# First we "try" to unpack the snap structure and untar the symlinks
# Then we pack the snap with these symlinks and then install
# Finally we check to see if the symlinks actually support the intervined symlinks
# Untar the symlinks
tar -xvf "$SNAP"/hell/hell.tar -C "$SNAP"/hell
snap try "$SNAP"
# Check to see if the symlinks point to the right paths
readlink "$SNAP_MOUNT_DIR"/"$SNAP"/current/hell/bar | MATCH "foo -> baz -> qux"
readlink "$SNAP_MOUNT_DIR"/"$SNAP"/current/hell/baz | MATCH "foo -> bar -> qux"
readlink "$SNAP_MOUNT_DIR"/"$SNAP"/current/hell/foo | MATCH "bar -> baz -> qux"
readlink "$SNAP_MOUNT_DIR"/"$SNAP"/current/hell/qux | MATCH "foo -> bar -> baz"
snap remove "$SNAP"
# Create a new snap structure that includes the unpacked symlinks
snap pack "$SNAP"
snap install --dangerous test-snapd-validate-container-happy_1.0_all.snap
tests.cleanup defer snap remove --purge test-snapd-validate-container-happy
# Check to see if the symlinks retain their existing paths
readlink "$SNAP_MOUNT_DIR"/"$SNAP"/current/hell/bar | MATCH "foo -> baz -> qux"
readlink "$SNAP_MOUNT_DIR"/"$SNAP"/current/hell/baz | MATCH "foo -> bar -> qux"
readlink "$SNAP_MOUNT_DIR"/"$SNAP"/current/hell/foo | MATCH "bar -> baz -> qux"
readlink "$SNAP_MOUNT_DIR"/"$SNAP"/current/hell/qux | MATCH "foo -> bar -> baz"
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