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Re: [PATCH 1/1] git-p4: recover from inconsistent perforce history




On Wed,  6 Feb 2019 19:42:19 +0000
andrew@xxxxxxxxxxxxx wrote:

> From: Andrew Oakley <andrew@xxxxxxxxxxxxx>
> 
> Perforce allows you commit files and directories with the same name, so
> you could have files //depot/foo and //depot/foo/bar both checked in.  A
> p4 sync of a repository in this state fails.  Deleting one of the files
> recovers the repository.
> 
> When this happens we want git-p4 to recover in the same way as perforce.

I'm finding the test fails for me on a clean git repo, although I can't see any obvious reason why.

Having the ability to detect when Perforce users submit a change which creates a file-inside-a-file will be really very useful.

Luke


> 
> Signed-off-by: Andrew Oakley <andrew@xxxxxxxxxxxxx>
> ---
>  git-p4.py                      | 41 ++++++++++++++++++++++--
>  t/t9834-git-p4-file-dir-bug.sh | 58 ++++++++++++++++++++++++++++++++++
>  2 files changed, 97 insertions(+), 2 deletions(-)
>  create mode 100755 t/t9834-git-p4-file-dir-bug.sh
> 
> diff --git a/git-p4.py b/git-p4.py
> index 3e12774f96..6bf2bbbcec 100755
> --- a/git-p4.py
> +++ b/git-p4.py
> @@ -3012,6 +3012,43 @@ def hasBranchPrefix(self, path):
>              print('Ignoring file outside of prefix: {0}'.format(path))
>          return hasPrefix
>  
> +    def isIncluded(self, path):
> +        return self.inClientSpec(path) and self.hasBranchPrefix(path)
> +
> +    def findShadowedFiles(self, files, change):
> +        # Perforce allows you commit files and directories with the same name,
> +        # so you could have files //depot/foo and //depot/foo/bar both checked
> +        # in.  A p4 sync of a repository in this state fails.  Deleting one of
> +        # the files recovers the repository.
> +        #
> +        # Git will not allow the broken state to exist and only the most recent
> +        # of the conflicting names is left in the repository.  When one of the
> +        # conflicting files is deleted we need to re-add the other one to make
> +        # sure the git repository recovers in the same way as perforce.
> +        deleted = [f for f in files if f['action'] in self.delete_actions]
> +        to_check = set()
> +        for f in deleted:
> +            path = f['path']
> +            to_check.add(path + '/...')
> +            while True:
> +                path = path.rsplit("/", 1)[0]
> +                if path == "/" or path in to_check:
> +                    break
> +                to_check.add(path)
> +        to_check = [p for p in to_check if self.isIncluded(p)]
> +        if to_check:
> +            stat_result = p4CmdList(
> +                ["fstat", "-T", "depotFile,headRev,headType"] +
> +                    ["%s@%s" % (p, change) for p in to_check])
> +            for record in stat_result:
> +                if record['code'] != 'stat':
> +                    continue
> +                files.append({
> +                    'action': 'add',
> +                    'path': record['depotFile'],
> +                    'rev': record['headRev'],
> +                    'type': record['headType']})
> +
>      def commit(self, details, files, branch, parent = "", allow_empty=False):
>          epoch = details["time"]
>          author = details["user"]
> @@ -3023,8 +3060,8 @@ def commit(self, details, files, branch, parent = "", allow_empty=False):
>          if self.clientSpecDirs:
>              self.clientSpecDirs.update_client_spec_path_cache(files)
>  
> -        files = [f for f in files
> -            if self.inClientSpec(f['path']) and self.hasBranchPrefix(f['path'])]
> +        files = [f for f in files if self.isIncluded(f['path'])]
> +        self.findShadowedFiles(files, details["change"])
>  
>          if gitConfigBool('git-p4.keepEmptyCommits'):
>              allow_empty = True
> diff --git a/t/t9834-git-p4-file-dir-bug.sh b/t/t9834-git-p4-file-dir-bug.sh
> new file mode 100755
> index 0000000000..9839a3d2bb
> --- /dev/null
> +++ b/t/t9834-git-p4-file-dir-bug.sh
> @@ -0,0 +1,58 @@
> +#!/bin/sh
> +
> +test_description='git p4 directory/file bug handling
> +
> +This test creates files and directories with the same name in perforce and
> +checks that git-p4 recovers from the error at the same time as the perforce
> +repository.'
> +
> +. ./lib-git-p4.sh
> +
> +test_expect_success 'start p4d' '
> +	start_p4d
> +'
> +
> +test_expect_success 'init depot' '
> +	(
> +		cd "$cli" &&
> +
> +		touch add_file_add_dir_del_file add_file_add_dir_del_dir &&
> +		p4 add add_file_add_dir_del_file add_file_add_dir_del_dir &&
> +		mkdir add_dir_add_file_del_file add_dir_add_file_del_dir &&
> +		touch add_dir_add_file_del_file/file add_dir_add_file_del_dir/file &&
> +		p4 add add_dir_add_file_del_file/file add_dir_add_file_del_dir/file &&
> +		p4 submit -d "add initial" &&
> +
> +		rm -f add_file_add_dir_del_file add_file_add_dir_del_dir &&
> +		mkdir add_file_add_dir_del_file add_file_add_dir_del_dir &&
> +		touch add_file_add_dir_del_file/file add_file_add_dir_del_dir/file &&
> +		p4 add add_file_add_dir_del_file/file add_file_add_dir_del_dir/file &&
> +		rm -rf add_dir_add_file_del_file add_dir_add_file_del_dir &&
> +		touch add_dir_add_file_del_file add_dir_add_file_del_dir &&
> +		p4 add add_dir_add_file_del_file add_dir_add_file_del_dir &&
> +		p4 submit -d "add conflicting" &&
> +
> +		p4 delete -k add_file_add_dir_del_file &&
> +		p4 delete -k add_file_add_dir_del_dir/file &&
> +		p4 delete -k add_dir_add_file_del_file &&
> +		p4 delete -k add_dir_add_file_del_dir/file &&
> +		p4 submit -d "delete conflicting"
> +	)
> +'
> +
> +test_expect_success 'clone with git-p4' '
> +	git p4 clone --dest="$git" //depot/@all
> +'
> +
> +test_expect_success 'check final contents' '
> +	test_path_is_dir "$git/add_file_add_dir_del_file" &&
> +	test_path_is_file "$git/add_file_add_dir_del_dir" &&
> +	test_path_is_dir "$git/add_dir_add_file_del_file" &&
> +	test_path_is_file "$git/add_dir_add_file_del_dir"
> +'
> +
> +test_expect_success 'kill p4d' '
> +	kill_p4d
> +'
> +
> +test_done
> -- 
> 2.19.2
> 


-- 
Luke Diamand <luke@xxxxxxxxxxx>