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switch ShellLauncher to use getAbsolutePath #4821
I ran into some issues with using JRuby on a system that uses busybox as it's userland, and without this patch things won't work.
For a bit of background: busybox's goal is to be a tiny userland (commands like ls and mv) for space-constrained devices. One of the ways it does this is by being a multi-call binary. You symlink it with names such as ls and cp, and it uses $0 to determine how it's called and thus what it should do. JRuby resolves the symlink before it execs, so busybox loses $0 and thus doesn't know what the user originally called. This patch fixes that.