Re: [fossil-users] What is a baseline?
On Fri, Jul 18, 2014 at 8:30 PM, Warren Young war...@etr-usa.com wrote: fossil help timeline talks about a BASELINE. I've discovered by playing that it can be an artifact ID, but I assume there has to be more to it than that, else why use a different term? Neither the Schimpf book nor fossil help really explain the term. It doesn't appear on the documentation index page or in the FAQ. A baseline is a side-effect of fossil's delta manifests. Originally, fossil required that all files belonging to a give version be included in that checkin's manifest (the official metadata). That proved to be problematic for repos with large numbers (thousands) of files, as it has to record thousands of files in a list when only one changed. List member Joerg Sonnenberg (spelling?) urged Richard to find a solution, and that solution was delta manifests. A baseline is a normal checkin record. A delta manifest is a checkin record which records only files which changed between its own version and the baseline version. Any given non-delta checkin can be a baseline for arbitrary other delta manifests. If a delta gets too big, a new baseline checkin is created with all the files listed in it, and further deltas can be generated from that one. i've got a simple browser which might make this clearer: http://fossil.wanderinghorse.net/repos/libfossil/cgidemo/index.cgi/manifest see the Parent/Baseline links, click those, and note the UUIDs. Sometimes the parent and baseline are the same, but not always. Typically any given baseline stays a baseline of its successors until the list of file changes gets to some computed portion of the original file list, at which point it is considered to be too far removed from the current version and a new baseline is created. So, in short: a baseline manifest is simply a checkin record (i.e. manifest) which is _not_ a delta manifest. Whether or not it actually acts as a baseline for any deltas is unimportant (maybe it does not now, but will tomorrow). Can a tag name be a baseline? No - only checkin records can. Originally, checkins were called manifests, but the word manifest now has several meanings. See: http://fossil.wanderinghorse.net/repos/libfossil/doxygen/page_terminology.html i hope that makes some sort of sense. -- - stephan beal http://wanderinghorse.net/home/stephan/ http://gplus.to/sgbeal Freedom is sloppy. But since tyranny's the only guaranteed byproduct of those who insist on a perfect world, freedom will have to do. -- Bigby Wolf ___ fossil-users mailing list fossil-users@lists.fossil-scm.org http://lists.fossil-scm.org:8080/cgi-bin/mailman/listinfo/fossil-users
Re: [fossil-users] What is a baseline?
Baseline is an older name for check-in. It drives from DO-178B language. We should updates the timeline help to say check-in instead, as that will be clearer to most readers, I think. On Fri, Jul 18, 2014 at 2:30 PM, Warren Young war...@etr-usa.com wrote: fossil help timeline talks about a BASELINE. I've discovered by playing that it can be an artifact ID, but I assume there has to be more to it than that, else why use a different term? Neither the Schimpf book nor fossil help really explain the term. It doesn't appear on the documentation index page or in the FAQ. Can a tag name be a baseline? ___ fossil-users mailing list fossil-users@lists.fossil-scm.org http://lists.fossil-scm.org:8080/cgi-bin/mailman/listinfo/fossil-users -- D. Richard Hipp d...@sqlite.org ___ fossil-users mailing list fossil-users@lists.fossil-scm.org http://lists.fossil-scm.org:8080/cgi-bin/mailman/listinfo/fossil-users
Re: [fossil-users] What is a baseline?
On Fri, Jul 18, 2014 at 2:40 PM, Stephan Beal sgb...@googlemail.com wrote: On Fri, Jul 18, 2014 at 8:30 PM, Warren Young war...@etr-usa.com wrote: fossil help timeline talks about a BASELINE. I've discovered by playing that it can be an artifact ID, but I assume there has to be more to it than that, else why use a different term? Neither the Schimpf book nor fossil help really explain the term. It doesn't appear on the documentation index page or in the FAQ. A baseline is a side-effect of fossil's delta manifests. That's a newer and unrelated meaning of the word baseline, that is still meaningful. I think the word baseline in the timeline help comment is the older, obsolete alias for check-in. Originally, fossil required that all files belonging to a give version be included in that checkin's manifest (the official metadata). That proved to be problematic for repos with large numbers (thousands) of files, as it has to record thousands of files in a list when only one changed. List member Joerg Sonnenberg (spelling?) urged Richard to find a solution, and that solution was delta manifests. A baseline is a normal checkin record. A delta manifest is a checkin record which records only files which changed between its own version and the baseline version. Any given non-delta checkin can be a baseline for arbitrary other delta manifests. If a delta gets too big, a new baseline checkin is created with all the files listed in it, and further deltas can be generated from that one. i've got a simple browser which might make this clearer: http://fossil.wanderinghorse.net/repos/libfossil/cgidemo/index.cgi/manifest see the Parent/Baseline links, click those, and note the UUIDs. Sometimes the parent and baseline are the same, but not always. Typically any given baseline stays a baseline of its successors until the list of file changes gets to some computed portion of the original file list, at which point it is considered to be too far removed from the current version and a new baseline is created. So, in short: a baseline manifest is simply a checkin record (i.e. manifest) which is _not_ a delta manifest. Whether or not it actually acts as a baseline for any deltas is unimportant (maybe it does not now, but will tomorrow). Can a tag name be a baseline? No - only checkin records can. Originally, checkins were called manifests, but the word manifest now has several meanings. See: http://fossil.wanderinghorse.net/repos/libfossil/doxygen/page_terminology.html i hope that makes some sort of sense. -- - stephan beal http://wanderinghorse.net/home/stephan/ http://gplus.to/sgbeal Freedom is sloppy. But since tyranny's the only guaranteed byproduct of those who insist on a perfect world, freedom will have to do. -- Bigby Wolf ___ fossil-users mailing list fossil-users@lists.fossil-scm.org http://lists.fossil-scm.org:8080/cgi-bin/mailman/listinfo/fossil-users -- D. Richard Hipp d...@sqlite.org ___ fossil-users mailing list fossil-users@lists.fossil-scm.org http://lists.fossil-scm.org:8080/cgi-bin/mailman/listinfo/fossil-users
Re: [fossil-users] What is a baseline?
On Fri, Jul 18, 2014 at 8:40 PM, Stephan Beal sgb...@googlemail.com wrote: i've got a simple browser which might make this clearer: http://fossil.wanderinghorse.net/repos/libfossil/cgidemo/index.cgi/manifest This one's a good example: http://fossil.wanderinghorse.net/repos/libfossil/cgidemo/index.cgi/manifest/98be7a7c10f23ccae709766 the Baseline is actually several versions back from the parent. If you first follow the Baseline link, then go Back and follow the Parent link (a few times), you should see that the next several Baseline links show up as visited, as those versions all share the same baseline manifest. -- - stephan beal http://wanderinghorse.net/home/stephan/ http://gplus.to/sgbeal Freedom is sloppy. But since tyranny's the only guaranteed byproduct of those who insist on a perfect world, freedom will have to do. -- Bigby Wolf ___ fossil-users mailing list fossil-users@lists.fossil-scm.org http://lists.fossil-scm.org:8080/cgi-bin/mailman/listinfo/fossil-users
Re: [fossil-users] What is a baseline?
On 7/18/2014 12:39, Richard Hipp wrote: We should updates the timeline help to say check-in instead, as that will be clearer to most readers, I think. Sounds good. Baseline appears in the help for /ci_edit /doc /info /zip 3-way-merge ci (as --baseline) descendants merge revert stash tag timeline The help for fossil tag talks about a hexadecimal baseline or artifact ID. Is there a difference? Can a tag name be a baseline? My understanding is that a non-propagating tag is an alias for an artifact ID, and can be used in the same places. True? ___ fossil-users mailing list fossil-users@lists.fossil-scm.org http://lists.fossil-scm.org:8080/cgi-bin/mailman/listinfo/fossil-users
Re: [fossil-users] What is a baseline?
On Fri, Jul 18, 2014 at 2:55 PM, Warren Young war...@etr-usa.com wrote: On 7/18/2014 12:39, Richard Hipp wrote: We should updates the timeline help to say check-in instead, as that will be clearer to most readers, I think. Sounds good. Baseline appears in the help for /ci_edit /doc /info /zip 3-way-merge ci (as --baseline) descendants merge revert stash tag timeline The help for fossil tag talks about a hexadecimal baseline or artifact ID. Is there a difference? Maybe. A check-in is a particular kind of artifact that defines a collection of files that is being checked in as a complete version of the program. An artifact ID can refer to thinks other than check-ins, for example specific versions of files or tickets or wiki pages, etc. In other words, a check-in is always an artifact but an artifact is not always a check-in. Can a tag name be a baseline? My understanding is that a non-propagating tag is an alias for an artifact ID, and can be used in the same places. True? Any tag can be used as a check-in name. It doesn't have to be non-propagating and it doesn't have to be unique. In the event that two or more check-ins both carry the same tag (perhaps because the tag propagates) then the one with the most recent timestamp is selected. ___ fossil-users mailing list fossil-users@lists.fossil-scm.org http://lists.fossil-scm.org:8080/cgi-bin/mailman/listinfo/fossil-users -- D. Richard Hipp d...@sqlite.org ___ fossil-users mailing list fossil-users@lists.fossil-scm.org http://lists.fossil-scm.org:8080/cgi-bin/mailman/listinfo/fossil-users
Re: [fossil-users] What is a baseline?
On Fri, Jul 18, 2014 at 2:55 PM, Warren Young war...@etr-usa.com wrote: Baseline appears in the help for ci (as --baseline) If I understand the description in the help, --baseline forces the created manifest to be a baseline manifest.. This seems reasonable. Perhaps the description can be made clearer? Also, add a description (somewhere) of baseline vs delta manifest. ___ fossil-users mailing list fossil-users@lists.fossil-scm.org http://lists.fossil-scm.org:8080/cgi-bin/mailman/listinfo/fossil-users
Re: [fossil-users] What is a baseline?
On Fri, Jul 18, 2014 at 3:23 PM, Ron W ronw.m...@gmail.com wrote: On Fri, Jul 18, 2014 at 2:55 PM, Warren Young war...@etr-usa.com wrote: Baseline appears in the help for ci (as --baseline) If I understand the description in the help, --baseline forces the created manifest to be a baseline manifest.. This seems reasonable. Perhaps the description can be made clearer? Also, add a description (somewhere) of baseline vs delta manifest. That use of the word baseline is in accordance with the meaning described by Stephan, not the older obsolete alias for check-in that is written as BASELINE on the timeline help page. Yes, that is confusing. And yes, it needs to be fixed. ___ fossil-users mailing list fossil-users@lists.fossil-scm.org http://lists.fossil-scm.org:8080/cgi-bin/mailman/listinfo/fossil-users -- D. Richard Hipp d...@sqlite.org ___ fossil-users mailing list fossil-users@lists.fossil-scm.org http://lists.fossil-scm.org:8080/cgi-bin/mailman/listinfo/fossil-users
