Getting rid of /bin has broken amgtar

[Ian Turner]

amgtar checks the realpath (i.e., resolving symlinks) before running sensitive binaries such as /bin/tar with elevated privileges. Moving the tar binary from /bin/tar to /usr/bin/tar breaks this check.

This results in the following error when trying to run /bin/tar under privilege:
amgtar: '/bin/tar' binary is not secure

The obvious fix is to change the compiled-in tar path to /usr/bin/tar instead of /bin/tar. This can be done by passing the GNUTAR environment variable to the configure script.

As a workaround, one may update /etc/amanda-security.conf file to whitelist /usr/bin/tar.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: amanda-common 1:3.5.1-2build2
ProcVersionSignature: Ubuntu 5.0.0-21.22-generic 5.0.15
Uname: Linux 5.0.0-21-generic x86_64
ApportVersion: 2.20.10-0ubuntu27.1
Architecture: amd64
CurrentDesktop: KDE
Date: Sat Jul 27 16:52:58 2019
SourcePackage: amanda
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.amandahosts: [inaccessible: [Errno 13] Permission denied: '/etc/amandahosts']