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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.
4.2 KiB
Swift Snapshot Tool
Used to list and bisect nightly snapshots off of swift.org.
Examples
List snapshots
# xcrun swift run swift_snapshot_tool list
[INFO] Starting to download snapshot information from github.
[INFO] Finished downloading snapshot information from github.
0 swift-DEVELOPMENT-SNAPSHOT-2024-09-06-a
1 swift-DEVELOPMENT-SNAPSHOT-2024-09-05-a
2 swift-DEVELOPMENT-SNAPSHOT-2024-09-04-a
3 swift-DEVELOPMENT-SNAPSHOT-2024-08-29-a
...
The number to the left is just the number back through historical time that the value is at. This allows for one to get a sense of the range of time in between two bisect numbers since one can look at the range in between them and how time varies.
One can specify a branch of snapshots to list. By default uses --development. Also supports the options --release_5_0, --release_6_0, --release_6_2.
Run
xcrun swift run swift_snapshot_tool run --script $SCRIPT_NAME \
--date YYYY-MM-DD [--invert] [--workspace $DIR_TO_DOWNLOAD_TOOLCHAINS]
run success is defined by $SCRIPT_NAME returning 0 as an exit code. All other
exit codes are considered a failure.
This command is meant to help one figure out where to start bisecting.
Options:
-
workspace: This is the place where we will download toolchains to. Defaults to
/tmp/swift_snapshot_tool_workspace_v1. We suggest that you use an external hard drive or a specified place so that one does not have to redownload toolchains in between system restarts. -
script: This is the script that should be run. We pass in the environment variables
SWIFT_EXEC,SWIFT_FRONTEND, andSWIFT_LIBRARY_PATHto the script. If the script returns a zero exit code then the run is considered a succeess. If the script returns a non-zero exit code, then the run is considered a failure. -
date: A date in the form YYYY-MM-DD. If a snapshot at date does not exist, we choose the first snapshot before that date.
-
invert: This causes test.sh's result to be inverted. This allows one to bisect backwards from a good state to a bad state. This is useful to determine when an error was fixed.
-
branch: This controls the specific branch of snapshots that are downloaded. By default uses --development. Also supports the options --release_5_0, --release_6_0, --release_6_2.
Bisect
xcrun swift run swift_snapshot_tool bisect --script $SCRIPT_NAME --old-date YYYY_MM_DD \
[--new-date YYYY_MM_DD] [--workspace $DIR_TO_DOWNLOAD_TOOLCHAINS]
bisect success is defined by $SCRIPT_NAME returning 0 as an exit code. All
other exit codes are considered a failure.
Options:
-
workspace: This is the place where we will download toolchains to. Defaults to
/tmp/swift_snapshot_tool_workspace_v1. We suggest that you use an external hard drive or a specified place so that one does not have to redownload toolchains in between system restarts. -
script: This is the script that should be run. We pass in the environment variables
SWIFT_EXEC,SWIFT_FRONTEND,SWIFT_LIBRARY_PATHto the script. If the script returns a zero exit code then the run is considered a succeess. If the script returns a non-zero exit code, then the run is considered a failure. -
old-date: Date in the form of YYYY-MM-DD. This is assumed to succeed by returning a zero exit code. If a snapshot does not exist at this date, the tool will choose the first snapshot before the date.
-
new-date: Date in the form of YYYY-MM-DD. This is assumed to fail by returning a non-zero exit code. If a snapshot does not exist at this date, the tool will choose the first snapshot before the date.
-
invert: This causes test.sh's result to be inverted. This allows one to bisect backwards from a good state to a bad state. This is useful to determine when an error was fixed.
-
branch: This controls the specific branch of snapshots that are downloaded. By default uses --development. Also supports the options --release_5_0, --release_6_0, --release_6_2.
FAQ and Helpful Tips
Bisecting against examples using Swift Testing
Swift Testing is not stored in the normal place in a toolchain. To test against such an example that uses swift testing pass into ones script the following -I command:
xcrun ${SWIFTC} "${@:1}" -o binary -parse-as-library -I ${SWIFT_LIBRARY_PATH}/testing