<src>to be a URL
- Referring to comments below, the
ADDdocumentation states that:
If is a local tar archive in a recognized compression format (identity, gzip, bzip2 or xz) then it is unpacked as a directory. Resources from remote URLs are not decompressed.
Note that the Best practices for writing Dockerfiles suggests using
COPY where the magic of
ADD is not required. Otherwise, you (since you had to look up this answer) are likely to get surprised someday when you mean to copy
keep_this_archive_intact.tar.gz into your container, but instead, you spray the contents onto your filesystem.