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58 lines
2.0 KiB
Markdown
58 lines
2.0 KiB
Markdown
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# Swift Snapshot Tool
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Used to list and bisect nightly snapshots off of swift.org.
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# Examples
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## List snapshots
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```
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# xcrun swift run swift_snapshot_tool list
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[INFO] Starting to download snapshot information from github.
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[INFO] Finished downloading snapshot information from github.
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0 swift-DEVELOPMENT-SNAPSHOT-2024-09-06-a
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1 swift-DEVELOPMENT-SNAPSHOT-2024-09-05-a
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2 swift-DEVELOPMENT-SNAPSHOT-2024-09-04-a
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3 swift-DEVELOPMENT-SNAPSHOT-2024-08-29-a
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...
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```
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The number to the left is just the number back through historical time that the
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value is at. This allows for one to get a sense of the range of time in between
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two bisect numbers since one can look at the range in between them and how time
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varies.
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## Bisect
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```
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xcrun swift run swift_snapshot_tool bisect --script $SCRIPT_NAME --workspace $DIR_TO_DOWNLOAD_TOOLCHAINS \
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--good-tag $OLDER_TAG_NAME_THAT_PASSES --bad-tag $NEWER_TAG_NAME_THAT_FAILS
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```
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bisect success is defined by `$SCRIPT_NAME` returning 0 as an exit code. All
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other exit codes are considered a failure.
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Options:
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- workspace: This is the place where we will download toolchains to. Defaults to
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`/tmp/swift_snapshot_tool_workspace_v1`
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- script: This is the script that should be run. We pass in the environment
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variables `SWIFT_EXEC` and `SWIFT_FRONTEND` to the subscript. If the script
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returns a zero exit code then the run is considered a succeess. If the script
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returns a non-zero exit code, then the run is considered a failure.
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- good_tag: This is the older tag and is assumed to succeed by returning a zero
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exit code.
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- bad_tag: This is the newer tag and is assumed to fail by returning a non-zero
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exit code.
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- invert: This causes test.sh's result to be inverted. This allows one to bisect
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backwards from a good state to a bad state. This is useful to determine when
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an error was fixed.
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- branch: This controls the specific branch of snapshots that are downloaded. By
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default uses development. Also supports the options 5.0 and 6.0.
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