Fix msys2-runtime based on Cygwin v3.0.1

[dscho]

The issue might have been with Cygwin v3.0.0 already, I don't know. The issue is that a couple of fields in uname -a are clipped: they miss the first character.

Most crucially, the output of uname -m does, too, which makes pacman believe that all of the new packages have an incorrect architecture.

This problem was the reason why I pulled the msys2-runtime update out of v2.21.0, and I will have to investigate and fix this issue after that version comes out. Unless somebody else beats me to it 😉

[magneticflux-]

Just got bit by this, I had to run pacman -U --arch x86_64 /var/cache/pacman/pkg/msys2-runtime-devel-2.11.2-1-x86_64.pkg.tar.xz /var/cache/pacman/pkg/msys2-runtime-2.11.2-1-x86_64.pkg.tar.xz to revert the affected packages.

[FlyingWombat]

Not sure if this is the same issue, or just one very close, but I have a work-around for it.
The issue I'm referring to is msys2/MSYS2-packages#1578 ,
which I believe to be caused by msys2-runtime 3.0.1 as packaged by git-for-windows.

with msys2-runtime 3.0.1 the $arch variable for pacman gets messed up.
Instead of reading x86_64, it reads 86_64.

A work-around for until this gets fixed is to edit /etc/pacman.conf
to change Architecture = auto to Architecture = x86_64

Here are some relevant errors:

debug: url: http://repo.msys2.org/msys/86_64/msys.db
debug: maxsize: 26214400
debug: opened tempfile for download: /var/lib/pacman/sync/msys.db.part (wb)
debug: curl returned error 0 from transfer
debug: response code: 404
error: failed retrieving file 'msys.db' from repo.msys2.org : The requested URL returned error: 404

where the correct URL should have 'x86_64' in it.

and

error: failed to prepare transaction (package architecture is not valid)
:: package git-extra-1.1.336.cef9ac0-1-x86_64 does not have a valid architecture

[magneticflux-]

@FlyingWombat That was already stated in the original issue.

Most crucially, the output of uname -m does, too, which makes pacman believe that all of the new packages have an incorrect architecture.

It looks like @kevinfengcu is using Git for Windows inside of MSYS2 proper, like I do.

[dscho]

@magneticflux- do feel free to debug the problem further by rebuilding msys-2.0.dll with debug print statements.

[orgads]

This also affects the build of Git itself in the git-sdk.

Sample output on Bash from Git installer:

$ uname -s
MINGW64_NT-6.1
$ uname -m
x86_64
$ uname -o
Msys
$ uname -r
2.11.2(0.329/5/3)
$ uname -p
unknown
$ uname -v
2018-11-10 14:38

On Git SDK Bash:

$ uname -s
MINGW64_NT-6.1
$ uname -m
86_64
$ uname -o
Msys
$ uname -r
.0.1(0.338/5/3)
$ uname -p
unknown
$ uname -v
019-02-20 14:24

[dscho]

$ uname -r
.0.1(0.338/5/3)

Ah, I get it: this would affect https://github.com/git-for-windows/git/blob/v2.21.0.windows.1/config.mak.uname#L628...

[kevinfengcu]

@magneticflux- Yes I am using Git for Windows repo in Msys.
I cannot find relevant discussion in Cygwin's mainling list, however there is a change in uname in version 3.0.0 here.

[dscho]

@kevinfengcu since you are trying to use Git for Windows in MSYS2 (I highly doubt that you mean MSys...), you need to understand that you are doing things that require a lot of expertise from you, as it would really be unfair to put even more of a maintenance burden on the Git for Windows project.

[dscho]

For the record, I went through the output of git range-diff 44c8e5632f^{/^Start.the}..44c8e5632f e054c53f7d^{/^Start.the}..e054c53f7d in a checkout of https://github.com/git-for-windows/msys2-runtime again, this time with a focus on public headers that might have been changed as incompatibly as uname.h, and I found that this was the only thing I missed in the rebase to v3.0.0/v3.0.1.

[dscho]

Oh, and also: the build is running and should be done in about 40 minutes from now. After that, it might still be a bit challenging to update for you MSYS2 users, the safest might be to roll back by force-installing https://wingit.blob.core.windows.net/x86-64/msys2-runtime-2.11.2-1-x86_64.pkg.tar.xz (and https://wingit.blob.core.windows.net/x86-64/msys2-runtime-devel-2.11.2-1-x86_64.pkg.tar.xz, if you have installed msys2-runtime-devel for some reason) via pacman -U <file>..., and then update the regular way with pacman -Syu.

Note: if you use Git for Windows' SDK and update by running git pull in a PowerShell or a CMD (i.e. not a Git SDK Bash), you will get this upgrade "for free", through my work.