RFR: JDK-8210283: Support git as an SCM alternative in the build

[Erik Joelsson]

It was pointed out offline that I had missed some "Mercurial" in log 
messages. This webrev also reintroduces the .gitignore file that was 
mistakenly omitted in the last webrev.

http://cr.openjdk.java.net/~erikj/8210283/webrev.03/

/Erik


On 2018-09-04 16:27, Erik Joelsson wrote:
> New webrev: http://cr.openjdk.java.net/~erikj/8210283/webrev.02/
>
> Fixed the comment in SourceRevision.gmk.
>
> Added an SCM identifier in the string so a typical .src-rev file now 
> looks like this:
>
> .:hg:3f189f451ff1+
>
> or like this:
>
> .:git:2e1f2c6d44e5+
>
> /Erik
>
>
> On 2018-09-04 15:00, Erik Joelsson wrote:
>> There are several instances of OpenJDK source being hosted in Git 
>> repositories instead of Mercurial. AdoptOpenJDK is one and some 
>> engineers use local conversions for their day to day work. Project 
>> Skara aims to investigate Git as well. To better support this, the 
>> build needs to be able to support Git as an alternative to Mercurial 
>> when creating the identification hash in the release file. It would 
>> also be convenient with a .gitignore file mirroring the .hgignore file.
>>
>> This patch adds such support as well as a .gitignore file.
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8210283
>>
>> Webrev: http://cr.openjdk.java.net/~erikj/8210283/webrev.01/index.html
>>
>> /Erik
>>
>