fix: open files read-only during format --check - #5961
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August 20, 2026 15:25
format --check only reads files to compare content but opened them with r+, which requires write permission and fails on read-only filesystems in certain CI setups. Use r for check mode and keep r+ for normal format runs that write back to disk. Signed-off-by: Amir Vakili <AVakili@Voleon.com>
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Description
sqlmesh format --check opened model/audit SQL files with r+ even though check mode only reads them. That requires write permission and can fail on read-only filesystems in certain CI setups.
This change opens files in r mode when check=True, and keeps r+ for normal format runs that write back to disk.
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