Merge pull request #181 from networm/09-git-and-other-scms_import-hg

Translate 09-git-and-other-scms import-hg

Author: networm

book/09-git-and-other-scms/sections/import-hg.asc

@@ -1,31 +1,31 @@
 ==== Mercurial
 
 (((Mercurial)))(((Importing, from Mercurial)))
-Since Mercurial and Git have fairly similar models for representing versions, and since Git is a bit more flexible, converting a repository from Mercurial to Git is fairly straightforward, using a tool called "hg-fast-export", which you'll need a copy of:
+因为 Mercurial 与 Git 在表示版本时有着非常相似的模型，也因为 Git 拥有更加强大的灵活性，将一个仓库从 Mercurial 转换到 Git 是相当直接的，使用一个叫作“hg-fast-export”的工具，需要从这里拷贝一份：
 
 [source,console]
 ----
 $ git clone http://repo.or.cz/r/fast-export.git /tmp/fast-export
 ----
 
-The first step in the conversion is to get a full clone of the Mercurial repository you want to convert:
+转换的第一步就是要先得到想要转换的 Mercurial 仓库的完整克隆：
 
 [source,console]
 ----
 $ hg clone <remote repo URL> /tmp/hg-repo
 ----
 
-The next step is to create an author mapping file.
-Mercurial is a bit more forgiving than Git for what it will put in the author field for changesets, so this is a good time to clean house.
-Generating this is a one-line command in a `bash` shell:
+下一步就是创建一个作者映射文件。
+Mercurial 对放入到变更集作者字段的内容比 Git 更宽容一些，所以这是一个清理的好机会。
+只需要用到 `bash` 终端下的一行命令：
 
 [source,console]
 ----
 $ cd /tmp/hg-repo
 $ hg log | grep user: | sort | uniq | sed 's/user: *//' > ../authors
 ----
 
-This will take a few seconds, depending on how long your project's history is, and afterwards the `/tmp/authors` file will look something like this:
+这会花费几秒钟，具体要看项目提交历史有多少，最终 `/tmp/authors` 文件看起来会像这样：
 
 [source]
 ----
@@ -37,10 +37,10 @@ Bob Jones <bob@company.com>
 Joe Smith <joe@company.com>
 ----
 
-In this example, the same person (Bob) has created changesets under four different names, one of which actually looks correct, and one of which would be completely invalid for a Git commit.
-Hg-fast-export lets us fix this by adding `={new name and email address}` at the end of every line we want to change, and removing the lines for any usernames that we want to leave alone.
-If all the usernames look fine, we won't need this file at all.
-In this example, we want our file to look like this:
+在这个例子中，同一个人（Bob）使用不同的名字创建变更集，其中一个实际上是正确的，另一个完全不符合 Git 提交的规范。
+Hg-fast-export 通过向我们想要修改的行尾添加 `={new name and email address}` 来修正这个问题，移除任何我们想要保留的用户名所在的行。
+如果所有的用户名看起来都是正确的，那我们根本就不需要这个文件。
+在本例中，我们会使文件看起来像这样：
 
 [source]
 ----
@@ -50,7 +50,7 @@ bob jones <bob <AT> company <DOT> com>=Bob Jones <bob@company.com>
 bob <bob@company.com>=Bob Jones <bob@company.com>
 ----
 
-The next step is to create our new Git repository, and run the export script:
+下一步是创建一个新的 Git 仓库，然后运行导出脚本：
 
 [source,console]
 ----
@@ -59,9 +59,9 @@ $ cd /tmp/converted
 $ /tmp/fast-export/hg-fast-export.sh -r /tmp/hg-repo -A /tmp/authors
 ----
 
-The `-r` flag tells hg-fast-export where to find the Mercurial repository we want to convert, and the `-A` flag tells it where to find the author-mapping file.
-The script parses Mercurial changesets and converts them into a script for Git's "fast-import" feature (which we'll discuss in detail a bit later on).
-This takes a bit (though it's _much_ faster than it would be over the network), and the output is fairly verbose:
+`-r` 选项告诉 hg-fast-export 去哪里寻找我们想要转换的 Mercurial 仓库，`-A` 标记告诉它在哪找到作者映射文件。
+这个脚本会分析 Mercurial 变更集然后将它们转换成 Git“fast-import”功能（我们将在之后详细讨论）需要的脚本。
+这会花一点时间（尽管它比通过网格 _更_ 快），输出相当的冗长：
 
 [source,console]
 ----
@@ -109,9 +109,9 @@ $ git shortlog -sn
    365  Joe Smith
 ----
 
-That's pretty much all there is to it.
-All of the Mercurial tags have been converted to Git tags, and Mercurial branches and bookmarks have been converted to Git branches.
-Now you're ready to push the repository up to its new server-side home:
+那看起来非常好。
+所有 Mercurial 标签都已被转换成 Git 标签，Mercurial 分支与书签都被转换成 Git 分支。
+现在已经准备好将仓库推送到新的服务器那边：
 
 [source,console]
 ----