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Date: Wed, 10 Sep 2014 22:26:35 +0000 (UTC)
From: "Sean Busbey (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12740622.1410386283000.3976.1410387995112@Atlassian.JIRA>
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 <JIRA.12740622.1410386283081@arcas>
Subject: [jira] [Commented] (HBASE-11937) Update patch submission guidelines
 to stop using --no-prefix
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    [ https://issues.apache.org/jira/browse/HBASE-11937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14129251#comment-14129251 ] 

Sean Busbey commented on HBASE-11937:
-------------------------------------

A committer should first see if the patch applies cleanly to master. This works the same regardless of which git command created the patch.

{noformat}
$> git fetch origin
$> git checkout master
$> git rebase origin/master
$> git checkout example-checking-HBASE-11891
$> git apply --check /some/path/to/patches/HBASE-11891.patch
{noformat}

No output means things are fine. Failures look like this:

{noformat}
$ git apply --check /some/path/to/patches/HBASE-11891.old.patch 
error: patch failed: hbase-client/src/main/java/org/apache/hadoop/hbase/client/ClusterStatusListener.java:34
error: hbase-client/src/main/java/org/apache/hadoop/hbase/client/ClusterStatusListener.java: patch does not apply
error: patch failed: hbase-common/src/main/java/org/apache/hadoop/hbase/HBaseInterfaceAudience.java:29
error: hbase-common/src/main/java/org/apache/hadoop/hbase/HBaseInterfaceAudience.java: patch does not apply
error: patch failed: hbase-common/src/main/java/org/apache/hadoop/hbase/codec/CellCodec.java:25
error: hbase-common/src/main/java/org/apache/hadoop/hbase/codec/CellCodec.java: patch does not apply
error: patch failed: hbase-common/src/main/java/org/apache/hadoop/hbase/codec/CellCodecWithTags.java:25
error: hbase-common/src/main/java/org/apache/hadoop/hbase/codec/CellCodecWithTags.java: patch does not apply
....
{noformat}

If the patch doesn't apply, the contributor should updated it for the current master.

A committer can tell if the patch was made with git format-patch (rather than git diff) if it begins with a header that looks like an email message:

{noformat}
>From b7893a4e07cbff333d48065dad9810f9f03cf159 Mon Sep 17 00:00:00 2001
From: Sean Busbey <busbey@apache.org>
Date: Wed, 3 Sep 2014 23:23:16 -0500
Subject: [PATCH] HBASE-11891 Introduce an HBaseInterfaceAudience level to
 denote class names that appear in configs.

---
{noformat}

If the patch was made with format patch, then they should use {{git am}} to apply.

{noformat}
$ git am /some/path/to/format-patch/patches/HBASE-11891.patch 
Applying: HBASE-11891 Introduce an HBaseInterfaceAudience level to denote class names that appear in configs.
{noformat}

This will place a commit in the current local branch, which you can interact with normally via git commands.

If the patch was mad with git diff, then they should use {{git apply}} to apply.

{noformat}
$ git apply /some/path/to/diff/patches/HBASE-11891.patch 
{noformat}

No output means things worked fine. This approach won't add a commit; instead all changes will be on the current working directory.

{noformat}
$ git status
# On branch example-checking-HBASE-11891
# Changes not staged for commit:
#   (use "git add <file>..." to update what will be committed)
#   (use "git checkout -- <file>..." to discard changes in working directory)
#
#	modified:   hbase-client/src/main/java/org/apache/hadoop/hbase/client/ClusterStatusListener.java
#	modified:   hbase-common/src/main/java/org/apache/hadoop/hbase/HBaseInterfaceAudience.java
#	modified:   hbase-common/src/main/java/org/apache/hadoop/hbase/codec/CellCodec.java
....
{noformat}

For patches created with {{git diff}} a committer can also use the {{patch}} command to apply changes locally.

{noformat}
$ patch -p1 < /some/path/to/diff/patches/HBASE-11891.patch 
patching file hbase-client/src/main/java/org/apache/hadoop/hbase/client/ClusterStatusListener.java
patching file hbase-common/src/main/java/org/apache/hadoop/hbase/HBaseInterfaceAudience.java
patching file hbase-common/src/main/java/org/apache/hadoop/hbase/codec/CellCodec.java
patching file hbase-common/src/main/java/org/apache/hadoop/hbase/codec/CellCodecWithTags.java
...
{noformat}

This should give you a working directory that is the same as the one created by {{git apply}}.

At this point you can interact with the local changes as you would with local modifications you made.


> Update patch submission guidelines to stop using --no-prefix
> ------------------------------------------------------------
>
>                 Key: HBASE-11937
>                 URL: https://issues.apache.org/jira/browse/HBASE-11937
>             Project: HBase
>          Issue Type: Improvement
>          Components: documentation
>            Reporter: Sean Busbey
>            Priority: Minor
>
> Right now the submission guidelines include the use of --no-prefix in the Methods to Create Patches section:
> {quote}
> Git
> git format-patch is preferred because it preserves commit messages. Use git squash first, to combine smaller commits into a single larger one.
> * git format-patch --no-prefix origin/master --stdout > HBASE-XXXX.patch
> * git diff --no-prefix origin/master > HBASE-XXXX.patch
> {quote}
> The use of --no-prefix means that users of {{git apply}} and {{git am}} have to know to specify {{-p0}} and (which strips 0 levels of prefix). Both of those tools default to stripping the 1 level of prefix git makes by default.
> The guide for HBase committers section on reviewing doesn't give any suggestions on how to apply patches from contributors. It should probably give examples for using {{git am}} and {{git apply}}.


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