sh is not consistent in its support of the echo builtin's -e flag. On
debian sh is symlinked to dash, which does not support the flag
resulting in bad credential output. Unfortunately /bin/echo is also
nonstandard - e.g. on macs -e is not supported while it is on debian. I
think the best approach is to rely on bash's echo builtin which should
be consistent across systems (at the slight cost of requiring bash as a
dependency)
and configure git to use it by default
`git-credential-env` only echoes the $GIT_CREDENTIAL_ENV environment variable
when git asks for https credentials.
with this, setting GIT_CREDENTIAL_ENV="username=name\npassword=xxx" sets the credentials
that will be used.
e.g.
docker run -e GIT_CREDENTIAL_ENV="username=name\npassword=xxx" jupyter/repo2docker https://github.com/private/repo
Gerhard Bräunlich