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Author	SHA1	Message	Date
Junio C Hamano	f859c846e9	Add has_symlink_leading_path() function. When we are applying a patch that creates a blob at a path, or when we are switching from a branch that does not have a blob at the path to another branch that has one, we need to make sure that there is nothing at the path in the working tree, as such a file is a local modification made by the user that would be lost by the operation. Normally, lstat() on the path and making sure ENOENT is returned is good enough for that purpose. However there is a twist. We may be creating a regular file arch/x86_64/boot/Makefile, while removing an existing symbolic link at arch/x86_64/boot that points at existing ../i386/boot directory that has Makefile in it. We always first check without touching filesystem and then perform the actual operation, so when we verify the new file, arch/x86_64/boot/Makefile, does not exist, we haven't removed the symbolic link arc/x86_64/boot symbolic link yet. lstat() on the file sees through the symbolic link and reports the file is there, which is not what we want. The function has_symlink_leading_path() function takes a path, and sees if any of the leading directory component is a symbolic link. When files in a new directory are created, we tend to process them together because both index and tree are sorted. The function takes advantage of this and allows the caller to cache and reuse which symbolic link on the filesystem caused the function to return true. The calling sequence would be: char last_symlink[PATH_MAX]; last_symlink = '\0'; for each index entry { if (!lose) continue; if (lstat(it)) if (errno == ENOENT) ; / happy / else error; else if (has_symlink_leading_path(it, last_symlink)) ; / happy / else error; / would lose local changes */ unlink_entry(it, last_symlink); } Signed-off-by: Junio C Hamano <junkio@cox.net>	18 years ago

Author

SHA1

Message

Date

Junio C Hamano

f859c846e9

Add has_symlink_leading_path() function.

When we are applying a patch that creates a blob at a path, or
when we are switching from a branch that does not have a blob at
the path to another branch that has one, we need to make sure
that there is nothing at the path in the working tree, as such a
file is a local modification made by the user that would be lost
by the operation.

Normally, lstat() on the path and making sure ENOENT is returned
is good enough for that purpose.  However there is a twist.  We
may be creating a regular file arch/x86_64/boot/Makefile, while
removing an existing symbolic link at arch/x86_64/boot that
points at existing ../i386/boot directory that has Makefile in
it.  We always first check without touching filesystem and then
perform the actual operation, so when we verify the new file,
arch/x86_64/boot/Makefile, does not exist, we haven't removed
the symbolic link arc/x86_64/boot symbolic link yet.  lstat() on
the file sees through the symbolic link and reports the file is
there, which is not what we want.

The function has_symlink_leading_path() function takes a path,
and sees if any of the leading directory component is a symbolic
link.

When files in a new directory are created, we tend to process
them together because both index and tree are sorted.  The
function takes advantage of this and allows the caller to cache
and reuse which symbolic link on the filesystem caused the
function to return true.

The calling sequence would be:

	char last_symlink[PATH_MAX];

        *last_symlink = '\0';
        for each index entry {
		if (!lose)
			continue;
		if (lstat(it))
			if (errno == ENOENT)
				; /* happy */
			else
				error;
		else if (has_symlink_leading_path(it, last_symlink))
			; /* happy */
		else
			error; /* would lose local changes */
		unlink_entry(it, last_symlink);
	}

Signed-off-by: Junio C Hamano <junkio@cox.net>

18 years ago

1 Commits (b4833a2c62578bdbfd300e296702214cb1b9a601)