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Update source-build to Azure-Linux-3-Amd64 image#16456

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mmitche merged 2 commits intomainfrom
copilot/update-source-build-image
Jan 16, 2026
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Update source-build to Azure-Linux-3-Amd64 image#16456
mmitche merged 2 commits intomainfrom
copilot/update-source-build-image

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Copilot AI commented Jan 16, 2026 •
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Source-build jobs in internal 1ES pipelines fail because 1es-azurelinux-3 lacks the Azure CLI, required for federated authentication via AzureCLI@2 task.

Changes

  • Updated eng/common/core-templates/job/source-build.yml to use Azure-Linux-3-Amd64 image instead of 1es-azurelinux-3 for internal 1ES pipeline pools

The new image includes Azure CLI pre-installed, resolving authentication failures in source-build workflows.

To double check:

Original prompt

This section details on the original issue you should resolve

<issue_title>Source build managed jobs failing with missing 'az' cli</issue_title>
<issue_description>Repo source build jobs are failing. The 1es azure-linux 3 image doesn't have the necessary az cli installed by default which is required to do an internal build.</issue_description>

Comments on the Issue (you are @copilot in this section)

@lbussell Dupe of https://github.com/dotnet/dnceng/issues/6029 @mmitche Okay, the source-build.yml's should be updated to use the new pool image.

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@mmitche
Update source-build pool image from 1es-azurelinux-3 to Azure-Linux-3…
6c720c1 
…-Amd64

Co-authored-by: mmitche <8725170+mmitche@users.noreply.github.com>
Copilot AI changed the title [WIP] Fix source build managed jobs failing due to missing 'az' cli Update source-build to Azure-Linux-3-Amd64 image Jan 16, 2026
Copilot AI requested a review from mmitche January 16, 2026 01:21
@akoeplinger akoeplinger mentioned this pull request Jan 16, 2026
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@mmitche mmitche marked this pull request as ready for review January 16, 2026 16:44
@mmitche mmitche requested a review from a team as a code owner January 16, 2026 16:44
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mmitche commented Jan 16, 2026

/backport to release/9.0

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mmitche commented Jan 16, 2026

/backport to release/10.0

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github-actions bot commented Jan 16, 2026

Started backporting to release/9.0 (link to workflow run)

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mmitche commented Jan 16, 2026

/backport to release/8.0

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github-actions bot commented Jan 16, 2026

Started backporting to release/10.0 (link to workflow run)

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github-actions bot commented Jan 16, 2026

Started backporting to release/8.0 (link to workflow run)

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github-actions bot commented Jan 16, 2026

@mmitche backporting to release/10.0 failed, the patch most likely resulted in conflicts. Please backport manually!

git am output 
$ git am --3way --empty=keep --ignore-whitespace --keep-non-patch changes.patch

Creating an empty commit: Initial plan
Applying: Update source-build pool image from 1es-azurelinux-3 to Azure-Linux-3-Amd64
Using index info to reconstruct a base tree...
M	eng/common/core-templates/job/source-build.yml
Falling back to patching base and 3-way merge...
Auto-merging eng/common/core-templates/job/source-build.yml
CONFLICT (content): Merge conflict in eng/common/core-templates/job/source-build.yml
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config set advice.mergeConflict false"
Patch failed at 0002 Update source-build pool image from 1es-azurelinux-3 to Azure-Linux-3-Amd64
Error: The process '/usr/bin/git' failed with exit code 128

Link to workflow output

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github-actions bot commented Jan 16, 2026

@mmitche backporting to release/8.0 failed, the patch most likely resulted in conflicts. Please backport manually!

git am output 
$ git am --3way --empty=keep --ignore-whitespace --keep-non-patch changes.patch

Creating an empty commit: Initial plan
Applying: Update source-build pool image from 1es-azurelinux-3 to Azure-Linux-3-Amd64
Using index info to reconstruct a base tree...
A	eng/common/core-templates/job/source-build.yml
Falling back to patching base and 3-way merge...
Auto-merging eng/common/templates-official/job/source-build.yml
CONFLICT (content): Merge conflict in eng/common/templates-official/job/source-build.yml
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config set advice.mergeConflict false"
Patch failed at 0002 Update source-build pool image from 1es-azurelinux-3 to Azure-Linux-3-Amd64
Error: The process '/usr/bin/git' failed with exit code 128

Link to workflow output

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MichaelSimons commented Jan 16, 2026

@mmitche - Just so you are aware, the way the templates are defined is broken for the 1ES internal scenario because the SB specified container is being ignored - see dotnet/source-build#5463. While this change fixes the particular repos that are broken, there is a risk we will see future differences because the SB specified container is being ignored. See dotnet/source-build#5463 for more details.

That all said, I don't see a high ROI in investing/improving this beyond your fix.

This was referenced Jan 16, 2026
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@mmitche mmitche merged commit bb62070 into main Jan 16, 2026
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@mmitche mmitche deleted the copilot/update-source-build-image branch January 16, 2026 21:45
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mmitche commented Jan 16, 2026

@mmitche - Just so you are aware, the way the templates are defined is broken for the 1ES internal scenario because the SB specified container is being ignored - see dotnet/source-build#5463. While this change fixes the particular repos that are broken, there is a risk we will see future differences because the SB specified container is being ignored. See dotnet/source-build#5463 for more details.

That all said, I don't see a high ROI in investing/improving this beyond your fix.

Thanks for the heads up.

@dotnet-maestro dotnet-maestro bot mentioned this pull request Jan 18, 2026
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@akoeplinger akoeplinger mentioned this pull request Jan 22, 2026
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Source build managed jobs failing with missing 'az' cli

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