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Introduce the 'usertemp' filesystem type

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* mount.cc (mount_info::from_fstab_line): Support mounting the current
	user's temp folder as /tmp/.  This is particularly useful a feature
	when Cygwin's own files are write-protected.

	* pathnames.xml: document the new usertemp file system type

Detailed explanation:

In the context of Windows, there is a per-user directory for temporary
files, by default specified via the environment variable %TEMP%. Let's
allow to use that directory for our /tmp/ directory.

With this patch, we introduce the special filesystem type "usertemp":
By specifying

	none /tmp usertemp binary,posix=0 0 0

in /etc/fstab, the /tmp/ directory gets auto-mounted to the directory
specified by the %TEMP% variable.

This feature comes handy in particularly in scenarios where the
administrator might want to write-protect the entire Cygwin directory
yet still needs to allow users to write into the /tmp/ directory.
This is the case in the context of Git for Windows, where the
Cygwin (MSys2) root directory lives inside C:\Program Files and hence
/tmp/ would not be writable otherwise.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
This commit is contained in:
Johannes Schindelin
2015-12-01 15:02:14 +01:00
committed by Corinna Vinschen
parent 5644f71428
commit fb71716d2c
5 changed files with 54 additions and 4 deletions
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4
winsup/doc/ChangeLog
View File

@@ -1,3 +1,7 @@
2015-12-07 Johannes Schindelin <johannes.schindelin@gmx.de>
* pathnames.xml: Document the new usertemp file system type.
2015-12-06 Corinna Vinschen <corinna@vinschen.de>
* new-features.xml (ov-new2.4): Document cygpath -U option.

24
winsup/doc/pathnames.xml
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@@ -74,9 +74,10 @@ doesn't matter if you write <literal>FAT</literal> into this field even if
the filesystem is NTFS. Cygwin figures out the filesystem type and its
capabilities by itself.</para>
<para>The only exception is the file system type cygdrive. This type is
used to set the cygdrive prefix. For a description of the cygdrive prefix
see <xref linkend="cygdrive"></xref></para>
<para>The only two exceptions are the file system types cygdrive and usertemp.
The cygdrive type is used to set the cygdrive prefix. For a description of
the cygdrive prefix see <xref linkend="cygdrive"></xref>, for a description of
the usertemp file system type see <xref linkend="usertemp"></xref></para>
<para>The fourth field describes the mount options associated
with the filesystem. It is formatted as a comma separated list of
@@ -354,6 +355,23 @@ independently from the current cygdrive prefix:</para>
</sect2>
<sect2 id="usertemp"><title>The usertemp file system type</title>
<para>On Windows, the environment variable <literal>TEMP</literal> specifies
the location of the temp folder. It serves the same purpose as the /tmp/
directory in Unix systems. In contrast to /tmp/, it is by default a
different folder for every Windows. By using the special purpose usertemp
file system, that temp folder can be mapped to /tmp/. This is particularly
useful in setups where the administrator wants to write-protect the entire
Cygwin directory. The usertemp file system can be configured in /etc/fstab
like this:</para>
<screen>
none /tmp usertemp binary,posix=0 0 0
</screen>
</sect2>
<sect2 id="pathnames-symlinks"><title>Symbolic links</title>
<para>Symbolic links are not present and supported on Windows until Windows