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Can reproduce this with buildah-1.11.6-8.el7_8.x86_64. And test it with buildah-1.11.6-11.el7_8.x86_64, it is fixed. Details:
# buildah bud .
STEP 1: FROM centos
Getting image source signatures
Copying blob e6a50b627bcb done
Copying config 0d53c857b2 done
Writing manifest to image destination
Storing signatures
STEP 2: ENV foo=oo
STEP 3: ADD ./f${foo} /tmp/foo
error building at STEP "ADD ./f${foo} /tmp/foo": no files found matching "/root/foo": no such file or directory
Although the build failed with no such file as I didn't touch a file with Dockerfile, but the file name is correctly as expect.
So set this to verified.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHSA-2020:2116