Re: [PATCH] Adding support for reloading configuration via systemd

["Jason A. Donenfeld" <Jason@zx2c4.com>]

On Fri, Jul 24, 2020 at 4:46 PM Dominique Martinet
<asmadeus@codewreck.org> wrote:
> FWIW, bash (and zsh, ksh etc) will optimise the last command call of a
> script to not fork, `bash -c 'exec foo'`  is the same as `bash -c 'foo'`
>
> (for some reason it doesn't in the subshell though so that one makes a
> difference; you can check with e.g. `strace -f -e clone bash -c ...`)
>
>
> Simpler shells e.g. dash or busybox ash don't, but they don't support
> the pipe substitution syntax either so I guess it doesn't matter here.

Right, I observed the same thing when I was testing this, but figured
it was better to be explicit in both cases.

thinkpad ~ # strace -f -e clone /bin/bash -c '/usr/bin/wg syncconf
wgnet0 <(/usr/bin/wg-quick strip wgnet0)' 2>&1 | grep clone | wc -l
3
thinkpad ~ # strace -f -e clone /bin/bash -c 'exec /usr/bin/wg
syncconf wgnet0 <(/usr/bin/wg-quick strip wgnet0)' 2>&1 | grep clone |
wc -l
3
thinkpad ~ # strace -f -e clone /bin/bash -c 'exec /usr/bin/wg
syncconf wgnet0 <(exec /usr/bin/wg-quick strip wgnet0)' 2>&1 | grep
clone | wc -l
2