diff options
Diffstat (limited to 'Modules/ExternalProject.cmake')
| -rw-r--r-- | Modules/ExternalProject.cmake | 53 |
1 files changed, 51 insertions, 2 deletions
diff --git a/Modules/ExternalProject.cmake b/Modules/ExternalProject.cmake index 9074b18..9b1963f 100644 --- a/Modules/ExternalProject.cmake +++ b/Modules/ExternalProject.cmake @@ -294,6 +294,42 @@ External Project Definition ``git clone`` command line, with each option required to be in the form ``key=value``. + ``GIT_REMOTE_UPDATE_STRATEGY <strategy>`` + When ``GIT_TAG`` refers to a remote branch, this option can be used to + specify how the update step behaves. The ``<strategy>`` must be one of + the following: + + ``CHECKOUT`` + Ignore the local branch and always checkout the branch specified by + ``GIT_TAG``. + + ``REBASE`` + Try to rebase the current branch to the one specified by ``GIT_TAG``. + If there are local uncommitted changes, they will be stashed first + and popped again after rebasing. If rebasing or popping stashed + changes fail, abort the rebase and halt with an error. + When ``GIT_REMOTE_UPDATE_STRATEGY`` is not present, this is the + default strategy unless the default has been overridden with + ``CMAKE_EP_GIT_REMOTE_UPDATE_STRATEGY`` (see below). + + ``REBASE_CHECKOUT`` + Same as ``REBASE`` except if the rebase fails, an annotated tag will + be created at the original ``HEAD`` position from before the rebase + and then checkout ``GIT_TAG`` just like the ``CHECKOUT`` strategy. + The message stored on the annotated tag will give information about + what was attempted and the tag name will include a timestamp so that + each failed run will add a new tag. This strategy ensures no changes + will be lost, but updates should always succeed if ``GIT_TAG`` refers + to a valid ref unless there are uncommitted changes that cannot be + popped successfully. + + The variable ``CMAKE_EP_GIT_REMOTE_UPDATE_STRATEGY`` can be set to + override the default strategy. This variable should not be set by a + project, it is intended for the user to set. It is primarily intended + for use in continuous integration scripts to ensure that when history + is rewritten on a remote branch, the build doesn't end up with unintended + changes or failed builds resulting from conflicts during rebase operations. + *Subversion* ``SVN_REPOSITORY <url>`` URL of the Subversion repository. @@ -938,6 +974,7 @@ The custom step could then be triggered from the main build like so:: cmake_policy(PUSH) cmake_policy(SET CMP0054 NEW) # if() quoted variables not dereferenced +cmake_policy(SET CMP0057 NEW) # if() supports IN_LIST # Pre-compute a regex to match documented keywords for each command. math(EXPR _ep_documentation_line_count "${CMAKE_CURRENT_LIST_LINE} - 4") @@ -1242,7 +1279,7 @@ endif() endfunction() -function(_ep_write_gitupdate_script script_filename git_EXECUTABLE git_tag git_remote_name init_submodules git_submodules_recurse git_submodules git_repository work_dir) +function(_ep_write_gitupdate_script script_filename git_EXECUTABLE git_tag git_remote_name init_submodules git_submodules_recurse git_submodules git_repository work_dir git_update_strategy) if("${git_tag}" STREQUAL "") message(FATAL_ERROR "Tag for git checkout should not be empty.") endif() @@ -2631,10 +2668,22 @@ function(_ep_add_update_command name) endif() endif() + get_property(git_update_strategy TARGET ${name} PROPERTY _EP_GIT_REMOTE_UPDATE_STRATEGY) + if(NOT git_update_strategy) + set(git_update_strategy "${CMAKE_EP_GIT_REMOTE_UPDATE_STRATEGY}") + endif() + if(NOT git_update_strategy) + set(git_update_strategy REBASE) + endif() + set(strategies CHECKOUT REBASE REBASE_CHECKOUT) + if(NOT git_update_strategy IN_LIST strategies) + message(FATAL_ERROR "'${git_update_strategy}' is not one of the supported strategies: ${strategies}") + endif() + _ep_get_git_submodules_recurse(git_submodules_recurse) _ep_write_gitupdate_script(${tmp_dir}/${name}-gitupdate.cmake - ${GIT_EXECUTABLE} ${git_tag} ${git_remote_name} ${git_init_submodules} "${git_submodules_recurse}" "${git_submodules}" ${git_repository} ${work_dir} + ${GIT_EXECUTABLE} ${git_tag} ${git_remote_name} ${git_init_submodules} "${git_submodules_recurse}" "${git_submodules}" ${git_repository} ${work_dir} ${git_update_strategy} ) set(cmd ${CMAKE_COMMAND} -P ${tmp_dir}/${name}-gitupdate.cmake) set(always 1) |