Mercurial中的软链接

Question

在Mercurial中是否有一些等效的NIX软链接或硬链接到目录或文件.

基本上,文件(或目录)链接到"其他地方"的文件,并遵循该位置的版本(与我认为常规分支不同,必须合并)

Answer 1

Mercurial版本软件库内部的软链接非常棒.它会检测它们,记录它们并为你创建它们.是否有您正在寻找的特定用例？到达存储库外部的链接最接近的是subrepo,它是指向另一个repo的特定版本的指针.

符号链接工作

(df)Ry4ans-MacBook-Air:~ ry4an$ hg init olav
(df)Ry4ans-MacBook-Air:~ ry4an$ cd olav/
(df)Ry4ans-MacBook-Air:olav ry4an$ echo this > target
(df)Ry4ans-MacBook-Air:olav ry4an$ ln -s target link
(df)Ry4ans-MacBook-Air:olav ry4an$ ls -l
total 16
lrwxr-xr-x  1 ry4an  staff     6B Feb 16 19:25 link@ -> target
-rw-r--r--  1 ry4an  staff     5B Feb 16 19:25 target
(df)Ry4ans-MacBook-Air:olav ry4an$ hg commit -A -m "link and its target"
adding link
adding target
(df)Ry4ans-MacBook-Air:olav ry4an$ hg log -p
changeset:   0:42a41a431661
tag:         tip
user:        Ry4an Brase <ry4an-hg@ry4an.org>
date:        Sat Feb 16 19:26:17 2013 -0500
summary:     link and its target

diff -r 000000000000 -r 42a41a431661 link
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/link  Sat Feb 16 19:26:17 2013 -0500
@@ -0,0 +1,1 @@
+target
\ No newline at end of file
diff -r 000000000000 -r 42a41a431661 target
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/target    Sat Feb 16 19:26:17 2013 -0500
@@ -0,0 +1,1 @@
+this

(df)Ry4ans-MacBook-Air:olav ry4an$ hg update null
0 files updated, 0 files merged, 2 files removed, 0 files unresolved
(df)Ry4ans-MacBook-Air:olav ry4an$ ls -l
(df)Ry4ans-MacBook-Air:olav ry4an$ hg update tip
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
(df)Ry4ans-MacBook-Air:olav ry4an$ ls -l
total 16
lrwxr-xr-x  1 ry4an  staff     6B Feb 16 19:26 link@ -> target
-rw-r--r--  1 ry4an  staff     5B Feb 16 19:26 target

但是硬链接没有

$hg commit -Am "hardlinks target"
adding link
adding target
$hg log -p
changeset:   0:ec9407634133
tag:         tip
user:        Chris Wesseling <chris.wesseling@cwi.nl>
date:        Wed Mar 13 23:14:44 2013 +0100
summary:     hardlinks target

diff -r 000000000000 -r ec9407634133 link
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/link      Wed Mar 13 23:14:44 2013 +0100
@@ -0,0 +1,1 @@
+foo
diff -r 000000000000 -r ec9407634133 target
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/target    Wed Mar 13 23:14:44 2013 +0100
@@ -0,0 +1,1 @@
+foo

$ls -lin
total 8
276702 -rw-r--r-- 2 1204653 5900 4 13 mrt 23:14 link
276702 -rw-r--r-- 2 1204653 5900 4 13 mrt 23:14 target
$hg update null
0 files updated, 0 files merged, 2 files removed, 0 files unresolved
$hg update tip
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ls -lin
total 8
276719 -rw-r--r-- 1 1204653 5900 4 13 mrt 23:15 link
276721 -rw-r--r-- 1 1204653 5900 4 13 mrt 23:15 target

Answer 2

*nix上的路径审核

在*nix系统上,hgMercurial审核引用路径安全性的符号链接("符号链接").例如,绝对路径和空路径被认为是不安全的,因此不会添加到存储库中.

Mercurial开发人员没有记录此功能.但是,源代码包含一个带有一些模糊解释的注释:

class pathauditor(object):
    '''ensure that a filesystem path contains no banned components.
    the following properties of a path are checked:

    - ends with a directory separator
    - under top-level .hg
    - starts at the root of a windows drive
    - contains ".."
    - traverses a symlink (e.g. a/symlink_here/b)
    - inside a nested repository (a callback can be used to approve
      some nested repositories, e.g., subrepositories)
    '''

在Windows上,由于各种原因不支持符号链接,请参阅:

• https://www.mercurial-scm.org/bts/issue1825
• https://www.mercurial-scm.org/bts/issue2579