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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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3
winsup/cygwin/include/sys/mount.h
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@ -44,7 +44,8 @@ enum
MOUNT_DOS = 0x40000, /* convert leading spaces and trailing
dots and spaces to private use area */
MOUNT_IHASH = 0x80000, /* Enforce hash values for inode numbers */
MOUNT_BIND = 0x100000 /* Allows bind syntax in fstab file. */
MOUNT_BIND = 0x100000, /* Allows bind syntax in fstab file. */
MOUNT_USER_TEMP = 0x200000 /* Mount the user's $TMP. */
};
int mount (const char *, const char *, unsigned __flags);