# Determining if a file exists in a bare repo 5 messages from 2010-05-04 to 2010-05-04. Participants: Adam Mercer, Jacob Helwig, Junio C Hamano. Thread: https://gitlist.dev/t/23696 ## Adam Mercer, 2010-05-04 16:11 Subject: Determining if a file exists in a bare repo Message-ID: URL: https://gitlist.dev/e/w2q799406d61005040911p8fd7c234s5e6382298129985f%40mail.gmail.com ``` Hi I'm trying to write a post-receive hook that generates some HTML files from reStructured text files stored in a repository. Essentially I'm doing this with git show master:INSTALL | rst2html --no-raw --no-file-insertion > /path/to/INSTALL.html However I would like this script to fail gracefully if the INSTALL file is not available in the repository so would like to check if this file exists. The problem I'm having is that git-show seems to return a zero return code even if the file you request doesn't exist, e.g.: $ git show master:NoneExistantFile fatal: ambiguous argument 'master:NoneExistantFile': unknown revision or path not in the working tree. Use '--' to separate paths from revisions $ echo $? 0 $ is there another, scriptable, way to determine if a given file exists in a given branch of a bare repository? Cheers Adam ``` ## Jacob Helwig, 2010-05-04 16:18 Subject: Re: Determining if a file exists in a bare repo Message-ID: URL: https://gitlist.dev/e/h2z8c9a061005040918s33bd5020sa89e95aedb7b8cb%40mail.gmail.com In-Reply-To: ``` On Tue, May 4, 2010 at 09:11, Adam Mercer wrote: > Hi > > I'm trying to write a post-receive hook that generates some HTML files > from reStructured text files stored in a repository. Essentially I'm > doing this with > > git show master:INSTALL | rst2html --no-raw --no-file-insertion > > /path/to/INSTALL.html > > However I would like this script to fail gracefully if the INSTALL > file is not available in the repository so would like to check if this > file exists. The problem I'm having is that git-show seems to return a > zero return code even if the file you request doesn't exist, e.g.: > > $ git show master:NoneExistantFile > fatal: ambiguous argument 'master:NoneExistantFile': unknown revision > or path not in the working tree. > Use '--' to separate paths from revisions > $ echo $? > 0 > $ > > is there another, scriptable, way to determine if a given file exists > in a given branch of a bare repository? > > Cheers > > Adam What about using "git ls-tree master" to get a file listing? ``` ## Adam Mercer, 2010-05-04 16:26 Subject: Re: Determining if a file exists in a bare repo Message-ID: URL: https://gitlist.dev/e/o2k799406d61005040926h6d9b56f5ge48378822ec46280%40mail.gmail.com In-Reply-To: ``` On Tue, May 4, 2010 at 11:18, Jacob Helwig wrote: > What about using "git ls-tree master" to get a file listing? Good idea, thanks that seems to do the trick. Cheers Adam ``` ## Junio C Hamano, 2010-05-04 16:39 Subject: Re: Determining if a file exists in a bare repo Message-ID: <7v7hnjoc3i.fsf@alter.siamese.dyndns.org> URL: https://gitlist.dev/e/7v7hnjoc3i.fsf%40alter.siamese.dyndns.org In-Reply-To: ``` Adam Mercer writes: > Hi > > I'm trying to write a post-receive hook that generates some HTML files > from reStructured text files stored in a repository. Essentially I'm > doing this with > > git show master:INSTALL | rst2html --no-raw --no-file-insertion > > /path/to/INSTALL.html > > However I would like this script to fail gracefully if the INSTALL > file is not available in the repository so would like to check if this > file exists. The problem I'm having is that git-show seems to return a > zero return code even if the file you request doesn't exist Even if it returned an error status, you are discarding it by placing the process on the upstream side of the pipe, so your command line above won't be able to catch an error anyway. I would probably do something like this if I were you: git rev-parse --verify master:INSTALL >/dev/null 2>&1 && git cat-file blob master:INSTALL | rst2... ``` ## Adam Mercer, 2010-05-04 16:57 Subject: Re: Determining if a file exists in a bare repo Message-ID: URL: https://gitlist.dev/e/z2p799406d61005040957j93f8f4a3zfb8a9f38dbe7c72c%40mail.gmail.com In-Reply-To: <7v7hnjoc3i.fsf@alter.siamese.dyndns.org> ``` On Tue, May 4, 2010 at 11:39, Junio C Hamano wrote: > Even if it returned an error status, you are discarding it by placing the > process on the upstream side of the pipe, so your command line above won't > be able to catch an error anyway. Sorry I wasn't very clear, first I trying to use git-show if the file existed and then piping the output to rst2html... > I would probably do something like this > if I were you: > >    git rev-parse --verify master:INSTALL >/dev/null 2>&1 && >    git cat-file blob master:INSTALL | rst2... Thanks, thats a better approach! Cheers Adam ```