Re: process committed files in post-receive hook

[Jeff King <peff@peff.net>]

On Wed, Dec 14, 2011 at 06:02:11PM -0800, Hao Wang wrote:

> Thank you all for providing the options. Just so you know I finally
> went with Alexey's suggestion. I used 'git show' to get both a list
> of files in a directory and the content of each file. It works great
> on a bare repository so there is no need to check out a copy on the
> server.

If you are scripting, we usually encourage the use of "plumbing"
commands whose output is guaranteed not to change ("show" is a
"porcelain" command intended to be used by end-users, and it's possible
that its behavior might change from version to version).

The plumbing command to get a directory listing for a tree is "git
ls-tree" (try the "--name-only" option for terse output, and use "-z" if
you want to be robust in the face of filenames with funny characters).

> # get a list of rule files using git show
> def getRuleFileList(rev):
>     # run git show
>     p = subprocess.Popen(['git', 'show', rev], stdout=subprocess.PIPE)
>     p.wait()
>     if p.returncode != 0: return None # error
> 
>     # parse output
>     i = 0
>     filelist = []
>     for line in p.stdout.readlines():
>         filelist.append(line)
>     p.stdout.close()
>     return filelist

Doesn't this put "tree HEAD:foo", as printed by "git show", at the top
of your filelist? Another reason to use ls-tree.

> # read the content of a file
> def readfile(rev):
>     # run git show
>     p = subprocess.Popen(['git', 'show', rev], stdout=subprocess.PIPE)
>     p.wait()
>     if p.returncode != 0: return None # error
>     return p.stdout.read()

The plumbing for this is "git cat-file blob ...".

-Peff