Re: Sparse checkout not working as expected (colons in filenames on Windows)

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From: "Duy Nguyen" <pclouds@xxxxxxxxx>
On Fri, Mar 20, 2015 at 6:07 AM, Philip Oakley <philipoakley@xxxxxxx> wrote:
Hi, I was expecting that sparse checkout could be used to avoid the checking out, by git, of files which have colons in their name into the worktree when
on Windows.

Yue Lin Ho reported on the Msygit list [1] that he had a repo where there was already committed a file with a colon in it's name, which was a needed file and had been committed by a Linux user. The problem was how to work with that repo on a Windows box where such a file is prohibited to exist on the FS (hence the expectation that a sparse checkout would suffice). Yue has
created a short test repo [2]

Even after getting the pathspec escaping right, I still haven't been able to
make this expected behaviour work [3].

Am I wrong to expect that sparse checkout (and the skip-worktree bit) can be used to avoid files with undesirable filenames hitting the OS's file system?

If it should be OK, what's the correct recipe?

--
Philip

[1]
https://groups.google.com/forum/?hl=en_US?hl%3Den#!topic/msysgit/D4HcHRpxPgU
"How to play around with the filename with colon on Windows?"
[2] Test repo https://github.com/t-pascal/tortoisegit-colons

[3] test sequence::
$ mkdir colons && cd colons
$ git clone -n https://github.com/t-pascal/tortoisegit-colons
$ cd tortoisegit-colons/
$ git config core.sparseCheckout true
$ cat .git/info/sparse-checkout # external editor
/*
!ifcfg-eth0\:0

Colons have no special meaning in gitignore rules and therefore need
not be escaped. The backslash is considered a literal character in
this case, probably not what you want.

$ git update-index --skip-worktree -- ifcfg-eth0\:0
Ignoring path ifcfg-eth0:0
$ git checkout -b test 7f35d34bc6160cc # tip commit, we are still unborn!
error: Invalid path 'ifcfg-eth0:0
D       ifcfg-eth0:0
Switched to a new branch 'test'
--
I've corrected the sparse-checkout, but won't the command line 'git update-index --skip-worktree' will still need it? (demo commands below)

That said, the final error (which I'd missed in the earlier post) is:
fatal: make_cache_entry failed for path 'ifcfg-eth0:0'

This is on the Windows (pre-compiled msysgit at v1.9.5) Git bash, so could be a catch path in that code for make_cache_entry (I've not checked the code yet). So at the moment it doesn't look like sparse checkout can be used to avoid colons in windows on-disk files based on the current code.
--
Philip

Philip@PHILIPOAKLEY /d/Git_repos/colons
$ cd tortoisegit-colons/

Philip@PHILIPOAKLEY /d/Git_repos/colons/tortoisegit-colons (test)
$ git update-index --skip-worktree -- ifcfg-eth0\:0
Ignoring path ifcfg-eth0:0

Philip@PHILIPOAKLEY /d/Git_repos/colons/tortoisegit-colons (test)
$ git reset
error: Invalid path 'ifcfg-eth0:0'
fatal: make_cache_entry failed for path 'ifcfg-eth0:0'

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