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Swift Testing is in the downloadable toolchains but is not in the normal library lookup path, so one needs to specify it explicitly with a -I command so it is found by the test command.
116 lines
4.2 KiB
Markdown
116 lines
4.2 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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One can specify a branch of snapshots to list. By default uses
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--development. Also supports the options --release_5_0, --release_6_0,
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--release_6_2.
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## Run
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```
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xcrun swift run swift_snapshot_tool run --script $SCRIPT_NAME \
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--date YYYY-MM-DD [--invert] [--workspace $DIR_TO_DOWNLOAD_TOOLCHAINS]
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```
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run success is defined by `$SCRIPT_NAME` returning 0 as an exit code. All other
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exit codes are considered a failure.
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This command is meant to help one figure out where to start bisecting.
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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`. We suggest that you use an external
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hard drive or a specified place so that one does not have to redownload
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toolchains in between system restarts.
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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`, `SWIFT_FRONTEND`, and `SWIFT_LIBRARY_PATH` to the
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script. If the script returns a zero exit code then the run is considered a
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succeess. If the script returns a non-zero exit code, then the run is
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considered a failure.
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- date: A date in the form YYYY-MM-DD. If a snapshot at date does not exist, we
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choose the first snapshot before that date.
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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 --release_5_0,
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--release_6_0, --release_6_2.
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## Bisect
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```
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xcrun swift run swift_snapshot_tool bisect --script $SCRIPT_NAME --old-date YYYY_MM_DD \
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[--new-date YYYY_MM_DD] [--workspace $DIR_TO_DOWNLOAD_TOOLCHAINS]
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```
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bisect success is defined by `$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`. We suggest that you use an external
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hard drive or a specified place so that one does not have to redownload
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toolchains in between system restarts.
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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`, `SWIFT_FRONTEND`, `SWIFT_LIBRARY_PATH` to the
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script. If the script returns a zero exit code then the run is considered a
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succeess. If the script returns a non-zero exit code, then the run is
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considered a failure.
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- old-date: Date in the form of YYYY-MM-DD. This is assumed to succeed by
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returning a zero exit code. If a snapshot does not exist at this date, the
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tool will choose the first snapshot before the date.
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- new-date: Date in the form of YYYY-MM-DD. This is assumed to fail by returning
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a non-zero exit code. If a snapshot does not exist at this date, the tool will
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choose the first snapshot before the date.
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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 --release_5_0,
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--release_6_0, --release_6_2.
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# FAQ and Helpful Tips
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## Bisecting against examples using Swift Testing
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Swift Testing is not stored in the normal place in a toolchain. To test against
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such an example that uses swift testing pass into ones script the following -I
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command:
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```
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xcrun ${SWIFTC} "${@:1}" -o binary -parse-as-library -I ${SWIFT_LIBRARY_PATH}/testing
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```
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