* Branch deletion question / possible bug? @ 2018-04-28 0:29 Tang (US), Pik S 2018-04-28 7:44 ` Jacob Keller 0 siblings, 1 reply; 5+ messages in thread From: Tang (US), Pik S @ 2018-04-28 0:29 UTC (permalink / raw) To: git Hi, I discovered that I was able to delete the feature branch I was in, due to some fat fingering on my part and case insensitivity. I never realized this could be done before. A quick google search did not give me a whole lot to work with... Steps to reproduce: 1. Create a feature branch, "editCss" 2. git checkout master 3. git checkout editCSS 4. git checkout editCss 5. git branch -d editCSS Normally, it should have been impossible for a user to delete the branch they're on. And the deletion left me in a weird state that took a while to dig out of. I know this was a user error, but I was also wondering if this was a bug. Thanks, Pik Tang ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Branch deletion question / possible bug? 2018-04-28 0:29 Branch deletion question / possible bug? Tang (US), Pik S @ 2018-04-28 7:44 ` Jacob Keller 2018-04-28 10:30 ` Philip Oakley 0 siblings, 1 reply; 5+ messages in thread From: Jacob Keller @ 2018-04-28 7:44 UTC (permalink / raw) To: Tang (US), Pik S; +Cc: git On Fri, Apr 27, 2018 at 5:29 PM, Tang (US), Pik S <Pik.S.Tang@boeing.com> wrote: > Hi, > > I discovered that I was able to delete the feature branch I was in, due to some fat fingering on my part and case insensitivity. I never realized this could be done before. A quick google search did not give me a whole lot to work with... > > Steps to reproduce: > 1. Create a feature branch, "editCss" > 2. git checkout master > 3. git checkout editCSS > 4. git checkout editCss > 5. git branch -d editCSS > Are you running on a case-insensitive file system? What version of git? I thought I recalled seeing commits to help avoid creating branches of the same name with separate case when we know we're on a file system which is case-insensitive.. > Normally, it should have been impossible for a user to delete the branch they're on. And the deletion left me in a weird state that took a while to dig out of. > > I know this was a user error, but I was also wondering if this was a bug. If we have not yet done this, I think we should. Long term this would be fixed by using a separate format to store refs than the filesystem, which has a few projects being worked on but none have been put into a release. Thanks, Jake > > > Thanks, > > Pik Tang > ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Branch deletion question / possible bug? 2018-04-28 7:44 ` Jacob Keller @ 2018-04-28 10:30 ` Philip Oakley 2018-04-28 12:43 ` Johannes Schindelin 0 siblings, 1 reply; 5+ messages in thread From: Philip Oakley @ 2018-04-28 10:30 UTC (permalink / raw) To: Jacob Keller, Tang (US), Pik S; +Cc: Git List From: "Jacob Keller" <jacob.keller@gmail.com> > On Fri, Apr 27, 2018 at 5:29 PM, Tang (US), Pik S <Pik.S.Tang@boeing.com> > wrote: >> Hi, >> >> I discovered that I was able to delete the feature branch I was in, due >> to some fat fingering on my part and case insensitivity. I never >> realized this could be done before. A quick google search did not give >> me a whole lot to work with... >> >> Steps to reproduce: >> 1. Create a feature branch, "editCss" >> 2. git checkout master >> 3. git checkout editCSS >> 4. git checkout editCss >> 5. git branch -d editCSS >> > > Are you running on a case-insensitive file system? What version of > git? I thought I recalled seeing commits to help avoid creating > branches of the same name with separate case when we know we're on a > file system which is case-insensitive.. > >> Normally, it should have been impossible for a user to delete the branch >> they're on. And the deletion left me in a weird state that took a while >> to dig out of. >> >> I know this was a user error, but I was also wondering if this was a bug. > > If we have not yet done this, I think we should. Long term this would > be fixed by using a separate format to store refs than the filesystem, > which has a few projects being worked on but none have been put into a > release. Yes, this is an on-going problem on Windows and other case insentive systems. At the moment the branch name becomes embedded as a file name, so when Git requests details of a branch from the filesystem, it can get a case insensitive equivalent. Meanwhile, internally Git is checking for equality in a case sensitive [Linux] way with obvious consequences such as this - The most obvious being when there is no "*" current branch marker in the branch status list. It's a bit tricky to fix (internally the name and the path are passed down different call chains), and depends on how one expects the case insensitivity to work - the kicker is when someone does an edit of the name via the file system and expects Git to cope (i.e. devs knowing, or think they know, too much detail ;-). The refs can also get packed, so the "bad spelling" gets baked in. Ultimately it probably means that GfW and other systems will need a case sensitivity check when opening paths... Philip > > Thanks, > Jake > >> >> >> Thanks, >> >> Pik Tang >> > ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Branch deletion question / possible bug? 2018-04-28 10:30 ` Philip Oakley @ 2018-04-28 12:43 ` Johannes Schindelin 2018-04-30 19:54 ` Tang (US), Pik S 0 siblings, 1 reply; 5+ messages in thread From: Johannes Schindelin @ 2018-04-28 12:43 UTC (permalink / raw) To: Philip Oakley; +Cc: Jacob Keller, Tang (US), Pik S, Git List Hi, On Sat, 28 Apr 2018, Philip Oakley wrote: > From: "Jacob Keller" <jacob.keller@gmail.com> > > On Fri, Apr 27, 2018 at 5:29 PM, Tang (US), Pik S <Pik.S.Tang@boeing.com> > > wrote: > > > Hi, > > > > > > I discovered that I was able to delete the feature branch I was in, due > > > to some fat fingering on my part and case insensitivity. I never > > > realized this could be done before. A quick google search did not give > > > me a whole lot to work with... > > > > > > Steps to reproduce: > > > 1. Create a feature branch, "editCss" > > > 2. git checkout master > > > 3. git checkout editCSS > > > 4. git checkout editCss > > > 5. git branch -d editCSS > > > > > > > Are you running on a case-insensitive file system? What version of > > git? I thought I recalled seeing commits to help avoid creating > > branches of the same name with separate case when we know we're on a > > file system which is case-insensitive.. > > > > > Normally, it should have been impossible for a user to delete the branch > > > they're on. And the deletion left me in a weird state that took a while > > > to dig out of. > > > > > > I know this was a user error, but I was also wondering if this was a bug. > > > > If we have not yet done this, I think we should. Long term this would > > be fixed by using a separate format to store refs than the filesystem, > > which has a few projects being worked on but none have been put into a > > release. > > Yes, this is an on-going problem on Windows and other case insentive > systems. At the moment the branch name becomes embedded as a file name, so > when Git requests details of a branch from the filesystem, it can get a case > insensitive equivalent. Meanwhile, internally Git is checking for equality > in a case sensitive [Linux] way with obvious consequences such as this - The > most obvious being when there is no "*" current branch marker in the branch > status list. > > It's a bit tricky to fix (internally the name and the path are passed down > different call chains), and depends on how one expects the case > insensitivity to work - the kicker is when someone does an edit of the name > via the file system and expects Git to cope (i.e. devs knowing, or think > they know, too much detail ;-). > > The refs can also get packed, so the "bad spelling" gets baked in. > Ultimately it probably means that GfW and other systems will need a case > sensitivity check when opening paths... FWIW I outlined what I think is the best route to fix this for good: https://github.com/git-for-windows/git/issues/1623#issuecomment-380085257 Essentially, I think we should teach Git the trick to check the spelling before calling lstat() in refs/files-backend.c. To check the spelling, we would need an API to get the on-disk representation of a given path. On Windows, I know this call. On Linux, apparently canonicalize_file_name() might do the job, but that is a GNU libc extension, and won't help us on macOS. Any ideas? Ciao, Dscho ^ permalink raw reply [flat|nested] 5+ messages in thread
* RE: Branch deletion question / possible bug? 2018-04-28 12:43 ` Johannes Schindelin @ 2018-04-30 19:54 ` Tang (US), Pik S 0 siblings, 0 replies; 5+ messages in thread From: Tang (US), Pik S @ 2018-04-30 19:54 UTC (permalink / raw) To: Johannes Schindelin, Philip Oakley; +Cc: Jacob Keller, Git List Hello, Thank you for all your replies. I am on a case insensitive system (Windows 10) running git version 2.14.1.windows.1. While I can't comment on what the fix would be, it has been enlightening to learn a bit more about what's under the cover of git. TIL :) Pik -----Original Message----- From: Johannes Schindelin [mailto:Johannes.Schindelin@gmx.de] Sent: Saturday, April 28, 2018 5:44 AM To: Philip Oakley <philipoakley@iee.org> Cc: Jacob Keller <jacob.keller@gmail.com>; Tang (US), Pik S <Pik.S.Tang@boeing.com>; Git List <git@vger.kernel.org> Subject: Re: Branch deletion question / possible bug? Hi, On Sat, 28 Apr 2018, Philip Oakley wrote: > From: "Jacob Keller" <jacob.keller@gmail.com> > > On Fri, Apr 27, 2018 at 5:29 PM, Tang (US), Pik S > > <Pik.S.Tang@boeing.com> > > wrote: > > > Hi, > > > > > > I discovered that I was able to delete the feature branch I was > > > in, due to some fat fingering on my part and case insensitivity. > > > I never realized this could be done before. A quick google search > > > did not give me a whole lot to work with... > > > > > > Steps to reproduce: > > > 1. Create a feature branch, "editCss" > > > 2. git checkout master > > > 3. git checkout editCSS > > > 4. git checkout editCss > > > 5. git branch -d editCSS > > > > > > > Are you running on a case-insensitive file system? What version of > > git? I thought I recalled seeing commits to help avoid creating > > branches of the same name with separate case when we know we're on a > > file system which is case-insensitive.. > > > > > Normally, it should have been impossible for a user to delete the > > > branch they're on. And the deletion left me in a weird state that > > > took a while to dig out of. > > > > > > I know this was a user error, but I was also wondering if this was a bug. > > > > If we have not yet done this, I think we should. Long term this > > would be fixed by using a separate format to store refs than the > > filesystem, which has a few projects being worked on but none have > > been put into a release. > > Yes, this is an on-going problem on Windows and other case insentive > systems. At the moment the branch name becomes embedded as a file > name, so when Git requests details of a branch from the filesystem, it > can get a case insensitive equivalent. Meanwhile, internally Git is > checking for equality in a case sensitive [Linux] way with obvious > consequences such as this - The most obvious being when there is no > "*" current branch marker in the branch status list. > > It's a bit tricky to fix (internally the name and the path are passed > down different call chains), and depends on how one expects the case > insensitivity to work - the kicker is when someone does an edit of the > name via the file system and expects Git to cope (i.e. devs knowing, > or think they know, too much detail ;-). > > The refs can also get packed, so the "bad spelling" gets baked in. > Ultimately it probably means that GfW and other systems will need a > case sensitivity check when opening paths... FWIW I outlined what I think is the best route to fix this for good: https://github.com/git-for-windows/git/issues/1623#issuecomment-380085257 Essentially, I think we should teach Git the trick to check the spelling before calling lstat() in refs/files-backend.c. To check the spelling, we would need an API to get the on-disk representation of a given path. On Windows, I know this call. On Linux, apparently canonicalize_file_name() might do the job, but that is a GNU libc extension, and won't help us on macOS. Any ideas? Ciao, Dscho ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2018-04-30 19:54 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2018-04-28 0:29 Branch deletion question / possible bug? Tang (US), Pik S 2018-04-28 7:44 ` Jacob Keller 2018-04-28 10:30 ` Philip Oakley 2018-04-28 12:43 ` Johannes Schindelin 2018-04-30 19:54 ` Tang (US), Pik S
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