Re: [PATCH 2/2] Add keyword unexpansion support to convert.c
- From
Robin H. Johnson <robbat2@gentoo.org>
- Date
- Apr 18, 2007, 11:08 UTC
- Message-ID
- <20070418110834.GK31488@curie-int.orbis-terrarum.net>
- In-Reply-To
- <87tzve9etj.fsf@morpheus.local>
On Wed, Apr 18, 2007 at 12:06:48PM +0200, David K??gedal wrote:
Show 8 quoted lines
> > This is perhaps a reasonable wording of my requirement. > > "Files from from the VCS should contain a stable machine-usable > > identifier that is unique for that revision of the file, without > > post-processing to insert the identifier." > But what is the "revision of the file"? The blob ID is just a hash of > the contents, and doesn't say anything about where in the history of > the project it appears. It will usually appear in many "project > revisions", i.e. commits.
The location/context in history of the file is not needed by the requirement I wrote above.
Since the BlobID is the hash of the contents (taken with all keywords collapsed obviously) - if the contents are identical, then the blobid is identical.
Since the contents and blobid are the same, it doesn't matter which commit you take the file from when you don't care about the history of that point (eg cat-file, diff).
The file goes out, and when a user throws it (modified) back at us, we just grab the $BlobId$ and use that to identify what it originally looked like.
-- Robin Hugh Johnson Gentoo Linux Developer & Council Member E-Mail : robbat2@gentoo.org GnuPG FP : 11AC BA4F 4778 E3F6 E4ED F38E B27B 944E 3488 4E85