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git update-git-for-windows: download ARM64 Git for Windows if applicable #340

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merged 1 commit into from
May 18, 2021

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dennisameling
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@dennisameling dennisameling commented May 8, 2021

Builds further on #338
Needed for git-for-windows/git#3107

If the /arm64/bin folder is present, we assume that the user has the ARM64 version of Git for Windows installed. When a new version is available, we'll then automatically download the ARM64 version. This is similar to the logic in git-wrapper.c in mingw-w64-git.

Sample release with a fake ARM64 installer (renamed 64-bit installer, just to show that the installer indeed downloads the correct file): https://github.com/dennisameling/git/releases/tag/2.31.2.windows.1

Tested as follows:

  1. Ensure /arm64/bin folder is present
  2. Point the update check script to my fake 2.31.2 release: https://github.com/dennisameling/git/releases/tag/2.31.2.windows.1
  3. Run cmd\git.exe update-git-for-windows --gui from Git Bash
  4. Get the "Update available" notification - it correctly downloaded the ARM64 installer

if [ -d "/arm64/bin" ]
then
version_string="Git for Windows $version (ARM64)"
filename_for_download="ARM64\.exe"
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I assumed that you want to call the ARM64 binaries something like Git-2.31.2-ARM64.exe - happy to change if you think there might be a better name though!

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No, I concur with you: Git-2.31.2-ARM64.exe sounds good.

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Thank you for all your work on the ARM64 version of Git for Windows!!!

I'd like to ask for just minor changes, and for a rebase on top of my (updated) PR.

@@ -211,7 +211,16 @@ update_git_for_windows () {
test -n "$quiet" && test "x$recently_seen" = "x$latest" && return

version=$(git --version | sed "s/git version //")
echo "Git for Windows $version (${bit}bit)" >&2
version_string="Git for Windows $version (${bit}bit)"
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This should probably be replaced already, too. How about

if test -d /arm64/bin
then
    arch_bit=ARM64
else
    arch_bit=${bit}-bit
fi

echo "Git for Windows $version ($arch_bit)" >&2

[...]
        grep "$arch_bit\.exe" |
[...]

version_string="Git for Windows $version (${bit}bit)"
filename_for_download="$bit\-bit\.exe"

if [ -d "/arm64/bin" ]
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Technically, the Git wrapper does more: it first verifies that we are running on ARM64. Therefore, we could implement the --is-running-on-ARM64 option in /cmd/git.exe and use that. But that sounds like quite a bit of effort for almost no value in return, so I'm fine with the directory check.

To align with Git's coding style, I would like to use test instead of [, though.

if [ -d "/arm64/bin" ]
then
version_string="Git for Windows $version (ARM64)"
filename_for_download="ARM64\.exe"
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No, I concur with you: Git-2.31.2-ARM64.exe sounds good.

If the /arm64/bin folder is present, we assume that the user has the
ARM64 version of Git for Windows installed. When a new version is
available, we'll then automatically download the ARM64 version. This is
similar to the logic in git-wrapper.c in mingw-w64-git (technically, the
Git wrapper _also_ tests whether it is running an ARM64 executable, but
we cannot do that in a shell script).

Signed-off-by: Dennis Ameling <[email protected]>
Signed-off-by: Johannes Schindelin <[email protected]>
@dscho dscho merged commit 58bcd90 into git-for-windows:main May 18, 2021
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dscho commented May 18, 2021

I went ahead and made those changes, and merged it. If things do not quite work as expected, we'll just need another PR, eh? 😄

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Thanks for making those changes! Quick test is looking good:

$ cmd/git.exe update-git-for-windows --gui
Dennis's fork 2.31.1.windows.1 (ARM64)
Update 2.31.2.windows.1 is available

Indeed downloads from the right path: https://github.com/dennisameling/git/releases/download/2.31.2.windows.1/Git-2.31.2-ARM64.exe

Great! This is really exciting 😊

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2 participants