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RTE SINGULARITY: Add a new parameter BINARY_PATH to redefine singularity location

nordugrid-arc-bot requested to merge dev-github-pr12 into next

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This merge request is automatically copied from !1195 (merged) orginally made by @arcbot
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This merge request is automatically copied from GitHub master pull request https://github.com/nordugrid/arc/pull/12 orginally made by @aldbr
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Currently, the singularity executable path is hard coded as /usr/bin/singularity. Nevertheless, in some cases (on supercomputers for instance), the singularity executable can be defined in other locations.

This PR aims to add a new parameter to the Singularity RTE: BINARY_PATH, that would redefine the binary path when needed. The default, of course, would remain /usr/bin/singularity. The parameter could be redefined either via the submission parameter, or via an environment variable.

Edited by Maiken

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