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[PR #10908] Fix WriteUTF8FileAtomic to preserve symlinks #28303

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opened 2026-01-31 09:27:39 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:27:39 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/10908

State: closed
Merged: Yes

WriteUTF8FileAtomic overrides the content of the file "atomically"
by creating a temp file and then renaming it to the original path.
The problem arises when the original path is symbolic link,
as the link itself gets overridden by a file (rather than the link target).
This PR introduces a special handling of the symlinks:
if the path as a symlink we resolve the path and use:

  1. target's directory to create a temp-file in
  2. target itself to be replaced with the tempfile.

Symlink resolution is problematic when the target path does not exist,
as there is no good utility that resolves such link (canonical() fails).
In this corner case we skip the "atomic" approach of renaming the file
and write the link target directly.

Closes #10787

**Original Pull Request:** https://github.com/microsoft/terminal/pull/10908 **State:** closed **Merged:** Yes --- WriteUTF8FileAtomic overrides the content of the file "atomically" by creating a temp file and then renaming it to the original path. The problem arises when the original path is symbolic link, as the link itself gets overridden by a file (rather than the link target). This PR introduces a special handling of the symlinks: if the path as a symlink we resolve the path and use: 1. target's directory to create a temp-file in 2. target itself to be replaced with the tempfile. Symlink resolution is problematic when the target path does not exist, as there is no good utility that resolves such link (canonical() fails). In this corner case we skip the "atomic" approach of renaming the file and write the link target directly. Closes #10787
claunia added the pull-request label 2026-01-31 09:27:39 +00:00
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Reference: starred/terminal#28303
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