Re: checking action of git-pull

[Junio C Hamano <gitster@pobox.com>]

"Mark Ryden" <markryde@gmail.com> writes:

> Hello,
>   I am working against a git repository which is updated at non regular
> intervals; sometimes it takes a day and sometimes a week or two.
>
> I have a script in crontab which runs daily which tries "git pull" of
> this repository.
>
> I want write a bash script which echoes yhe  result of this git pull
> to a log file in such
> a way that in case that any files were pulled, a short message
> saying "files were pulled at date ddmmyyyy" will be added to a log file.
> In case that there there were no changes, a message saying
> "Already up-to-date (ddmmyyyy) will be added to a log file.
>
> How can it be done ?
> can I test somehow the return value of git pull in a bash script for
> these two different
> cases?

You know that a no-op pull does not update HEAD and a successful pull
does.  So your script would do something like:

	#!/bin/sh

        original_head=$(git rev-parse HEAD) || exit
        git pull origin || exit
        updated_head=$(git rev-parse HEAD) || exit
        if test "$updated_head" = "$original_head"
        then
        	echo Upstream is idling
	else
        	echo These new commits were brought in
                git shortlog $original_head..$updated_head
	fi