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Cache opam root (~/.opam on Unix, D:\.opam on Windows), opam download-cache (~/.opam/download-cache on Unix, D:\.opam\download-cache on Windows), and opam local switch (_opam).
If dune-cache enabled, install dune, automatically configure the dune cache for the most efficient use in CI (exports DUNE_CACHE=enabled, DUNE_CACHE_TRANSPORT=direct. TRANSPORT must be direct, not daemon, to speed up the opam install process and to support Windows: ocaml/dune#4166, ocaml/dune#4167), and share the dune cache directory for each run.
If opam-pin is enabled, pin the local packages specified by opam-local-packages.
If opam-depext is enabled, install the system dependencies specified by opam-local-packages via depext
If opam-disable-sandboxing is enabled, sandboxing is disabled for all platforms except Windows. (Sandboxing is always disabled on the Windows runners due to limitations of opam.)
Added opam-repositories input to support multiple opam repositories.
2.0.0-beta10
Added "extends" experimentally.
Changed
2.0.0-alpha
The Windows runners install mingw64-i686-gcc-core and mingw64-i686-gcc-g++ for 32 bit compiler variant support.
Clean the log output by grouping some operations.
The compiler will be initialised in all platforms with an opam local switch to eliminate differences between platforms and prepare for full dependency caching in the future.
The macOS and Ubuntu runners install and cache opam from the GitHub release directly without the system package manager.
The macOS and Ubuntu runners install darcs and mercurial.
Export MSYS=winsymlinks:native for @actions/cache on the Windows runners.
Export HOME=%USERPROFILE% for opam on the Windows runners.
2.0.0-beta2
Changed to force an update of the opam cache if the week number is changed.
2.0.0-beta3
Use the week number to manage Cygwin cache.
2.0.0-beta4
Set OPAMSOLVERTIMEOUT to 1000 to avoid a timeout even if the opam solver is slow.
Increase cache hit ratio by loosening restore keys of opam cache.
2.0.0-beta5
Reduce GitHub API calls to avoid issues that can easily hit rate-limiting.
2.0.0-beta6
Unlock opam 2.1 on the Ubuntu and macOS runners.
2.0.0-beta8
Use 2.1 mode instead of 2.0 mode on the Ubuntu and macOS runners.
2.0.0-beta9
Increase the allowed artifact cache size from 5GB to 10GB.
2.0.0-beta10
Remove some hacks as --no-depexts is now used in CLI 2.0 mode from opam 2.1.2.
2.0.0-beta13
Do not install opam-depext if it's not enabled.
2.0.0
Update default runtime to node16.
Removed
2.0.0-alpha
The ocaml-version input has been removed. Use the ocaml-compiler instead.
The simplified version specifying scheme (e.g. 4.12.0) support has been removed.
2.0.0-beta
The opam-repository input has been removed in order to add the opam-repositories input.
2.0.0-beta2
Removed the profiling functionality added in 2.0.0-alpha.
Fixed
2.0.0-alpha
Use the appropriate file system behavior parameters on the Windows runners. (R2L:1, R2R:1)
Add ppa: avsm/musl on 18.04 and older Ubuntu runners.
Pass --enable-shell-hook to opam init fixes a bug that must be run via opam exec in subsequent steps.
The Ubuntu runners install gcc-multilib, g++-multilib for ocaml-option-32bit.
2.0.0-beta3
Set repository priorities correctly for multiple repositories feature.
Lock the version of opam to be installed only to < 2.1 releases until opam 2.2 is released.
2.0.0-beta5
If no user-input version is found in the opam-repository, explicitly raise an error instead of implicitly breaking the workflow.
Retrieve the base compiler version from opam-repository to use the live released compiler version.
2.0.0-beta7
Return an empty array to avoid depext failure when depext flags are not passed.
2.0.0-beta11
Add support for more styles for the ocamlformat configuration in lint-fmt action.
2.0.0-beta12
Fallback to the version in which the assets exist if no assets exist in the latest opam release.
Instruct Cygwin setup to use "sys" symlinks during setup (partial workaround for bug with native symlinks in Cygwin setup - some depexts may still be affected)
2.0.0-beta13
Print a proper error if the version not found in the .ocamlformat file.