In BASH we can change directory to an unknown name, using a * as a wildcard - for example:
cd /some/*ing will change directory to cd /some/thing/ (if there is only 1 match for the wildcard)
How can we do the same thing using WORKDIR in a Dockerfile?
If I try to do WORKDIR /some/*ing, then it instead creates a directory named literally /some/*ing/ and it changes directory to that, instead of /some/thing/
WORKDIR does not support the use of a * as a wildcardRUN cd does support the use of a * as a wildcard, but will not affect subsequent RUN commandsRUN mv to move the directory to a constant known directory name could affect other programs (E.G. git init) that expect the directory to exist at the unknown name* as a wildcardThe following code can be used to change to a directory where only the last part of the directory's name is known (ending with .wiki).
For example to change directory to /docs/someunknowndir.wiki/, using a symlink at /docs/wiki/:
# Starting directory
WORKDIR /docs
# Create a symlink from the unknown name to a known name
RUN ln -s *.wiki wiki
# Change to the dir, using the known name
WORKDIR wiki
# Do stuff with the dir - E.G.
RUN ls -Rlah .
# When finished doing stuff with the dir...
# Reset to the starting directory
WORKDIR ..
# Delete the dir at the unknown name + the symlink at the known name
RUN rm -rf *.wiki wiki
Thanks goes to @CharlesDuffy for the symlink idea!