The --b2-versions support added in 3fe2aaf96 strips a version string
from the last segment of a path before encrypting it, so that the
plain text version suffixes which the underlying backend appends to
encrypted file leaf names can be handled. EncryptDirName and
DecryptDirName share that code, so the last segment of a *directory*
name was version stripped too. Only file leaf names are ever given a
version string by the backend - a directory gets a
version-string-like name from the user, and such a name is encrypted
verbatim when it appears as the parent of a file name, so the same
directory ended up with two different encryptions.
Before this change, with a directory whose name matches rclone's
version format, eg dir-v2001-02-03-040506-123:
rclone copy file.txt crypt:dir-v2001-02-03-040506-123/
rclone ls crypt:dir-v2001-02-03-040506-123
# => "directory not found" - the file is invisible to listings
rclone mkdir crypt:dir-v2001-02-03-040506-123
# => creates a second directory with the same decrypted name
After this change EncryptDirName and DecryptDirName encrypt directory
names verbatim, so a directory encrypts the same way whether it is
named on its own or as the parent of a file. Version strings are only
added to file names by the underlying backend, so --b2-versions is
unaffected and the existing version tests are untouched.
A directory which was created by the old EncryptDirName will no longer
decrypt and will be reported as undecryptable in listings. Such
directories were already unusable - anything copied into one was
written to a different encrypted directory - so nothing which worked
before is broken by this.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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