2013/1/26 Jeff King <peff@xxxxxxxx>:
> On Fri, Jan 25, 2013 at 06:44:13PM +0400, Alexey Shumkin wrote:
>
>> test_web_browse () {
>> - # browser=$1 url=$2
>> + # browser=$1 url=$2 sleep_timeout=$3
>> + sleep_timeout="$3"
>> git web--browse --browser="$1" "$2" >actual &&
>> + # if $3 is set
>> + # as far as Firefox is run in background (it is run with &)
>> + # we trying to avoid race condition
>> + # by waiting for "$sleep_timeout" seconds of timeout for
>> 'fake_browser_ran' file appearance
>> + (test -z "$sleep_timeout" || (
>> + for timeout in $(seq 1 $sleep_timeout); do
>> + test -f fake_browser_ran && break
>> + sleep 1
>> + done
>> + test $timeout -ne $sleep_timeout
>> + )
>> + ) &&
>> tr -d '\015' <actual >text &&
>
> Gross, but I don't really see another way to handle the asynchronous
> nature of spawning background browsers.
>
> Two things, though:
>
> 1. Should test_web_browse just delete fake_browser_ran for us? Then
> later tests do not have to remember to do so.
Yep, you're right
>
> 2. Seeing fake_browser_ran appeared, we know that the script has
> started. But there is still a race condition in which it may not
> have written anything to "actual" yet.
Definitely right
>
> In this implementation:
>
>> + cat >"fake browser" <<-\EOF &&
>> + #!/bin/sh
>> +
>> + : > fake_browser_ran
>> + if test "$1" = "-version"; then
>> + echo Fake Firefox browser version 1.2.3
>> + else
>> + # Firefox (in contrast to w3m) is run in background (with
>> &)
>> + # so redirect output to "actual"
>> + echo fake: "$@" > actual
>> + fi
>> + EOF
>
> There is a period where fake_browser_ran exists, but nothing is in
> actual. You can solve it by setting fake_browser_ran at the end rather
> than the beginning.
>
> Or you can drop fake_browser_ran entirely, and just atomically move
> actual into place, like:
>
> echo "fake: $*" >actual.tmp
> mv actual.tmp actual
>
> and then tes-t_web_browse can just spin waiting for "actual" to appear.
Not exactly, because, as I see, "actual" file is a result of redirection of
> git web--browse --browser="$1" "$2" >actual &&
command
>
> -Peff
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