Difference between revisions of "Talk:VCS package guidelines"

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(git pkgver: Date of last commit at the beginning of the version number for compatibility with older PKGBUILDs from AUR?)
(git pkgver: Date of last commit at the beginning of the version number for compatibility with older PKGBUILDs from AUR?)
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--[[User:Hardfalcon|Hardfalcon]] ([[User talk:Hardfalcon|talk]]) 21:22, 17 August 2013 (UTC)
--[[User:Hardfalcon|Hardfalcon]] ([[User talk:Hardfalcon|talk]]) 21:22, 17 August 2013 (UTC)
:Since it's just a local workaround, why not just hardcode a larger number in there? If you want the date of the last commit, I would suggest awk as being easier to use and to read/understand: git log -n 1 --date=short | awk '/Date/ {gsub ("-",""); print $2}'
:Since it's just a local workaround, why not just hardcode a larger number in there? If you want the date of the last commit, I would suggest awk as being easier to use and to read/understand
git log -n 1 --date=short | awk '/Date/ {gsub ("-",""); print $2}'
:[[User:Scimmia|Scimmia]] ([[User talk:Scimmia|talk]]) 05:29, 18 August 2013 (UTC)
:[[User:Scimmia|Scimmia]] ([[User talk:Scimmia|talk]]) 05:29, 18 August 2013 (UTC)

Revision as of 05:33, 18 August 2013

https:// vs git://

Could we consider a guideline to use firewall-friendly protocols when possible (e.g. https://github.com/matplotlib/matplotlib.git instead of git://github.com/matplotlib/matplotlib.git)? --Mitch feaster 14:34, 15 November 2011 (EST)

It shouldn't be too hard to just mention that. As I haven't heard of anybody else ever bringing it up, it'd probably be enough.
--Det (talk) 22:51, 2 May 2013 (UTC)

Updating a CVS repo

I don't use cvs. How can you describe the pkgver for cvs (for pacman 4.1)?
-- Dracorp (talk) 09:31, 6 April 2013 (UTC)

CVS is not supported in pacman 4.1 like the other VCS tools. You will need to update pkgver manually until CVS support is added.
-- Jstjohn (talk) 22:44, 15 April 2013 (UTC)
Yeah, but how about mentioning that in the article (as well as giving a download example)? Even if it's not that common anymore.
--Det (talk) 22:39, 2 May 2013 (UTC)
The download example can still be found in /usr/share/pacman/. The next version of the ABS package should update it a bit so the download happens in the prepare function where it belongs. As for pkgver, I think the generic example using date covers that, as there's not a way to get a version number from a CVS repo. Maybe a note to that effect?
-- Scimmia (talk) 07:17, 15 May 2013 (UTC)
That makes the most sense, but it might also be a good idea to rename the "Fallback" section to something like "Fallback / CVS" to make it more obvious even when you're just checking out the table of contents.
But as for ABS, as far as I can tell the last commit was over 8 months ago.
--Det (talk) 05:54, 19 May 2013 (UTC)
Hmm, there were a number of patches submitted last month for cleaning up the prototypes, looks like none have been committed yet. I do remember a discussion (IRC maybe?) questioning the proper place for the prototypes, so maybe that's why? Looking at the patches, I was mistaken anyway; they didn't update the darcs or cvs prototypes. Simple enough, I'll send in a patch myself.
--Scimmia (talk) 08:22, 19 May 2013 (UTC)
I use this dirty hack: cvs history -c -a | cut -d' ' -f2 | sort -u | tail -n 1 | sed 's|-||g" ; could probably be improved. --Buhman (talk) 18:00, 6 June 2013 (UTC)

Checking out branches/tags needs clarification

The #fragment part of the VCS source URL has a different meaning for each type of VCS. This can be confusing for people, especially when they are trying to checkout a specific branch or tag. Examples would reduce the chance for confusion a lot.

fictional examples for git and svn (don't have experience with bzr or HG)

check out branch git_test of git://myproject.com into folder my_git_code :


Check out branch svn_test of svn://myproject.com into folder my_svn_code :


Lone_Wolf (talk) 20:49, 16 April 2013 (UTC)

Makes sense. At least for those two.
--Det (talk) 22:53, 2 May 2013 (UTC)

More on git pkgver()'s

I would also like to see packages use pkgver functions like this:

git describe --always --long | sed -E 's/([^-]*-g)/r\1/;s/-/./g'

so they are more friendly to vercmp. Current behaviour using git-git as an example:

current ver: next ver:

1 # the first is greater than the second

Right now, the current version is actually greater than the new version, causing a downgrade. If r is appended to the patch level (the numbers just before the g<hex> bit), then vercmp would order the versions correctly.

current ver: 1.8.2.r210.g123abc-1 next ver:

vercmp 1.8.2.r210.g123abc
-1 # the first is less than the second

KaiSforza (talk) 20:42, 18 April 2013 (UTC)

So Git makes some projects jump down from x.x.x.210 to x.x.x.x.50? Is that really intended behavior?
--Det (talk) 22:48, 2 May 2013 (UTC)
Yes, that's intended behavior. That number is the number of commits since the last tag, so it will reset every time the author tags a new commit.
Scimmia (talk) 08:02, 4 May 2013 (UTC)
I noticed just now there's the .1.
--Det (talk) 20:44, 14 May 2013 (UTC)
Why not make the change for use .r or ~ instead from the actual . for prevent that problem
--Jristz (talk) 18:52, 17 May 2013 (UTC)
Well, that's what's being suggested..
--Det (talk) 05:57, 19 May 2013 (UTC)
I have the same issue with tup--git package that bumped its version from 0.6 to 0.6.5. previously generated version was 0.6.350.gfoobar now it became 0.6.5 that is smaller than previous. Generated version should split upstream version from 'git describe' version. My vote is goes to '~' delimiter proposed above. Or maybe we can use '-' as delimiter?
--Anatolik (talk) 11:43, 17 Jun 2013 (UTC)
You can't have a '-' in the pkgver, so that's out. '~' is an option, but I kind of like the suggested '.r'. Seems cleaner to me.
Scimmia (talk) 16:47, 26 July 2013 (UTC)

Clarifying the first Git function

Instead of just sed 's|-|.|g' it'd probably be better to give some example with cut (which you're probably gonna end up using anyway) and tr (which is simpler than sed). Then you could either explain it like this or just mention the man pages: "cut -d "-" -f2- cuts from the first hyphen (-) to the end, tr - . converts hyphens to dots (.) and tr -d - removes the hyphens".


pkgver() {
  cd local_repo
  git describe --always | cut -d "-" -f2- | tr - .
Note: See the man pages of cut(1) and tr(1) for more info.

--Det (talk) 00:22, 3 May 2013 (UTC)

Did you test this before posting? It doesn't do anything like you think it does. Scimmia (talk) 22:29, 4 May 2013 (UTC)
Well, my friend, that's what makes it an example. The reason I'm using cut is to remove the actual project names that are often included in their tags. All the sed example does is change the hyphens (-) to dots (.), which is simpler to do with tr - . anyway.
What _makes_ it so hard is that there isn't a single solution that somehow magicly worked on all scenarios. Even if you decided to be clever and started cutting the output up until the first number (with something like $ sed 's/\([^0-9]*\)\(.*\)/\2/g'), you'd still end up with the wrong result whenever the "version" starts with a letter or the project name ends with a number.
--Det (talk) 21:04, 7 May 2013 (UTC)
Ah, I see now, you were addressing a special case. You're right, there isn't a single solution. You're also right that tr is simpler and should probably be used in the example if that's all the example is going to show. It seems to be fairly common, though, to include a "v" at the beginning of the version number, in which case you'd already be using sed anyway so you can just do sed 's/^v//;s/-/./g' So many ways of doing the same job. Scimmia (talk) 02:15, 8 May 2013 (UTC)
That only works when they do. It doesn't remove the names from the tags, which are included in things like Wine and the entire X stack.
git describe --always | sed 's/\([^0-9]*\)\(.*\)/\2/g; s/-/./g' is the most universal approach I can think of. But it's totally unreadable and a damn lot harder to edit than some cut/tr example.
--Det (talk) 20:37, 14 May 2013 (UTC)
Yeah, my example was a special case as well. I'm really thinking that this is a situation where it's best just to include a very simple example and let the maintainer customize it as needed instead of trying to find a convoluted solution that works everywhere.
-- Scimmia (talk) 07:11, 15 May 2013 (UTC)
In that sense the current one is pretty fitting, but it sort of gives the impression that it works "right away", which it doesn't. So at least a note for probably having to do something yourself would be good.
--Det (talk) 06:03, 19 May 2013 (UTC)

Use --long insead of --always in git describe

--always is for returning something even when it can't find a tag. It just returns the short hash of the commit, which is kind of useless in this example. On the other hand --long is needed to get the output we want if HEAD has a tag. By default, git describe would just return the name of the tag, --long forces it to return the full output we want, ie "2.0-0-g123abcd" instead of just "2.0". --Scimmia (talk) 09:40, 22 May 2013 (UTC)

pkgver function for hg based on tags

I recent came across a way with hg to show the most recent tag, as well as the number of commits from this tag (similar to the output of `git describe`.)

pkgver() {
  cd local_repo
  hg log -r . --template '{latesttag}.{latesttagdistance}.{node|short}\n'

Please could this be included in the page.

Garyvdm (talk) 09:03, 23 July 2013 (UTC)

Support for shallow copies

Some git repositories are really really large, and forcing a full copy on the initial download might not be ideal. Git (don't know about the other VCSs) supports passing a --depth option to only download the last couple of commits rather than everything. Thoughts on including this functionality somehow in the PKGBUILD VCS support?

Jonhoo (talk) 18:14, 26 July 2013 (UTC)

Does this work with a bare clone? Check the pacman-devel mailing list, I seem to remember this being discussed and rejected. This talk page really isn't the place to discuss changes to pacman, anyway.
also, please sign your posts with 4 tildes
Scimmia (talk) 15:17, 26 July 2013 (UTC)
Shallow cloning should work fine from a bare clone.
After a bit of Googling, I came up with (aur-general) please add -depth 1 to makepkg git clone and (pacman-dev) (PATCH) Use shallow clones for git sources to reduce traffic, so should anyone else want to discuss it, that's probably a better place to continue the discussion as Scimmia pointed out.
(Oh, and I added the signature to my original post too)
Jonhoo (talk) 18:14, 26 July 2013 (UTC)

git pkgver: Date of last commit at the beginning of the version number for compatibility with older PKGBUILDs from AUR?

We have quite a bunch of older PKGBUILDs for -git packages in AUR which still work but which do not have a pkgver function yet. Many of these actually carry a date as version number (mostly the date of the last git commit at the time when the PKGBUILD was last updated).

When you update these scripts to use one of the two pkgver functions suggested on the wiki page, AUR helpers like packer will (in most cases) suggest that there is a newer version in AUR on every system update. My proposal to solve this problem is a pkgver function which precedes the generated version number with the date of the last git commit:

pkgver() {
	cd "${_pkgname}"
	echo $(git log -n 1 --date=short | sed -nr 's|^Date:\s+([0-9]{4})-([0-9]{2})-([0-9]{2})$|\1\2\3|p').$(git rev-list --count HEAD).$(git rev-parse --short HEAD)

This function is *not* intended to go into PKGBUILDs in AUR, but could be proposed as a temporary "local" fix in the wiki for the period of time until the package maintainer has found time to update his PKGBUILD in AUR.

--Hardfalcon (talk) 21:22, 17 August 2013 (UTC)

Since it's just a local workaround, why not just hardcode a larger number in there? If you want the date of the last commit, I would suggest awk as being easier to use and to read/understand
git log -n 1 --date=short | awk '/Date/ {gsub ("-",""); print $2}'
Scimmia (talk) 05:29, 18 August 2013 (UTC)