Executing function inside chroot in bash

Question

What would be the ideal way to pass a function into a chroot from the host, in bash?

For example,

install_script () { wget some_source_files && configure && make && make install }

and,

some_command -v foo >/dev/null 2>&1 || install_script

but if i want to execute the same from the host into chroot, How do i go about doing it?

One way i can think of is to pass the function to a file inside the chrooted directory,

cat > $chrooted_dir/etc/install_script.sh <<"EOF" #!/bin/bash wget source_files ; ./configure ; make ; make install EOF

and execute from host,

chroot $chrooted_dir /bin/bash "check_command || /etc/install_script.sh"

But i am wondering if there is a more elegant way to approach this? Ideally, i would like to execute the commands from a cript in the host and have some installation performed inside chroot system.

P.S: I would also appreciate of any relevant sources/links to understand bash handles function declarations and subsequent inherits on chrooting.

that other guy · Accepted Answer · 2015-06-11 22:05:30Z

You can export functions and execute them in an inheriting shell:

install_func () { wget some_source_files && configure && make && make install } export -f install_func chroot "$chrooted_dir" /bin/bash -c "install_func"

The function will be turned into an environment variable with the name BASH_FUNC_install_func%%, which will be inherited and reinterpretted as a function by the chrooted bash.

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