Re: git fast-export not preserving executable permissions?
On Fri, May 01, 2020 at 09:35:28AM -0400, Doug Glidden wrote:
> Taylor,
(My full response is below, but please in general do not top-quote mail here.)
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>
> Thanks for your response! It looks like git does not actually
> recognize the file as executable:
>
> $ git ls-tree HEAD
> 100644 blob 7d2f57b2381766924e1e4ffcc62615c637bbd784 executable_script.sh
> 100644 blob d1d7cf309e091f54f268503b31653d8eba42fe88
> non_executable_file.txt
>
> Now you have me wondering if the real problem here is that I'm working
> in git-bash on a Windows machine, which means the file permissions
> aren't completely native.
I was wondering if that was the case ;-). If you are using NTFS or FAT32, neither of these filesystems support execute permission bits. (I am certainly not an expert here, but I know that Dscho (cc'd) would be able to answer authoritatively here.)
That said, *Git* understands executable permissions, even if your filesystem doesn't. You can tell Git to mark a file as executable by the following:
$ git update-index --chmod=+x /path/to/file
and then committing the result. Round-tripping this through 'git fast-{im,ex}port' should preserve the permissions from Git's perspective, and ditto for checking out the contents of a repository on a filesystem that does support the executable permission bit.
> I'm going to run a similar experiment in a native Linux environment
> and see if I get the same results. I'll let you know what I find.
Sounds good. I'll be very surprised if it doesn't work as you expect.
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> Thanks,
> Doug
>
>
>
> On Wed, Apr 29, 2020 at 2:49 PM Taylor Blau <me@ttaylorr.com> wrote:
> >
> > Hi Doug,
> >
> > On Wed, Apr 29, 2020 at 09:36:31AM -0400, Doug Glidden wrote:
> > > Hello Git world!
> > >
> > > I have run into an issue that I cannot seem to resolve with git
> > > fast-export. When running a fast-export on a repo that contains
> > > scripts with executable permissions (e.g. a gradlew script), the
> > > resulting export does not properly reflect the executable permissions
> > > on the script files.
> >
> > Interesting. fast-import and fast-export both understand executable
> > modes (although Git only understands the modes 644 and 755 for blobs),
> > so this should be working.
> >
> > I can not reproduce the issue as-is. Round-tripping a fast-import and
> > fast-export preserves executable bits for me:
> >
> > #!/bin/bash
> >
> > set -e
> >
> > rm -rf repo client
> >
> > git init -q repo
> > git init -q client
> >
> > (
> > cd repo
> > printf "x" >x
> > printf "y" >y
> > chmod +x x
> > git add x y
> > git commit -q -m "initial commit"
> > )
> >
> > git -C repo fast-export HEAD | git -C client fast-import
> >
> > diff -u <(git -C repo ls-tree HEAD) <(git -C client ls-tree HEAD)
> >
> > > To illustrate this issue, I created a small sample repo, with one
> > > executable file and one non-executable file. From the output below,
> > > you can see that the mode in the output from fast-export is the same
> > > for both files; according to the documentation for fast-import, the
> > > mode for the executable file should be 100755 instead of 100644.
> > >
> > > $ ls -gG
> > > total 2
> > > -rwxr-xr-x 1 106 Apr 29 09:13 executable_script.sh*
> > > -rw-r--r-- 1 63 Apr 29 09:12 non_executable_file.txt
> > >
> > > $ git fast-export --all
> > > blob
> > > mark :1
> > > data 106
> > > #!/bin/bash
> > >
> > > # This is a shell script that should be executable.
> > > echo 'The script executed successfully!'
> > >
> > > blob
> > > mark :2
> > > data 63
> > > This file is a simple text file that should not be executable.
> > >
> > > reset refs/heads/dev
> > > commit refs/heads/dev
> > > mark :3
> > > author Doug <41mortimer@gmail.com> 1588167102 -0400
> > > committer Doug <41mortimer@gmail.com> 1588167102 -0400
> > > data 25
> > > Adding some sample files
> > > M 100644 :1 executable_script.sh
> > > M 100644 :2 non_executable_file.txt
> > >
> > > Please let me know if there is any further information I can provide
> > > about this issue.
> >
> > Does Git think that the file is executable? Please run 'git ls-tree
> > HEAD' to find out.
> >
> > > Thank you,
> > > Doug
> >
> > Thanks,
> > Taylor
