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-rw-r--r--Modules/ExternalProject-gitupdate.cmake.in216
1 files changed, 216 insertions, 0 deletions
diff --git a/Modules/ExternalProject-gitupdate.cmake.in b/Modules/ExternalProject-gitupdate.cmake.in
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+++ b/Modules/ExternalProject-gitupdate.cmake.in
@@ -0,0 +1,216 @@
+# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+cmake_minimum_required(VERSION 3.5)
+
+execute_process(
+ COMMAND "@git_EXECUTABLE@" rev-list --max-count=1 HEAD
+ WORKING_DIRECTORY "@work_dir@"
+ RESULT_VARIABLE error_code
+ OUTPUT_VARIABLE head_sha
+ OUTPUT_STRIP_TRAILING_WHITESPACE
+ )
+if(error_code)
+ message(FATAL_ERROR "Failed to get the hash for HEAD")
+endif()
+
+execute_process(
+ COMMAND "@git_EXECUTABLE@" show-ref "@git_tag@"
+ WORKING_DIRECTORY "@work_dir@"
+ OUTPUT_VARIABLE show_ref_output
+ )
+# If a remote ref is asked for, which can possibly move around,
+# we must always do a fetch and checkout.
+if("${show_ref_output}" MATCHES "remotes")
+ set(is_remote_ref 1)
+else()
+ set(is_remote_ref 0)
+endif()
+
+# Tag is in the form <remote>/<tag> (i.e. origin/master) we must strip
+# the remote from the tag.
+if("${show_ref_output}" MATCHES "refs/remotes/@git_tag@")
+ string(REGEX MATCH "^([^/]+)/(.+)$" _unused "@git_tag@")
+ set(git_remote "${CMAKE_MATCH_1}")
+ set(git_tag "${CMAKE_MATCH_2}")
+else()
+ set(git_remote "@git_remote_name@")
+ set(git_tag "@git_tag@")
+endif()
+
+# This will fail if the tag does not exist (it probably has not been fetched
+# yet).
+execute_process(
+ COMMAND "@git_EXECUTABLE@" rev-list --max-count=1 "${git_tag}"
+ WORKING_DIRECTORY "@work_dir@"
+ RESULT_VARIABLE error_code
+ OUTPUT_VARIABLE tag_sha
+ OUTPUT_STRIP_TRAILING_WHITESPACE
+ )
+
+# Is the hash checkout out that we want?
+if(error_code OR is_remote_ref OR NOT ("${tag_sha}" STREQUAL "${head_sha}"))
+ execute_process(
+ COMMAND "@git_EXECUTABLE@" fetch
+ WORKING_DIRECTORY "@work_dir@"
+ RESULT_VARIABLE error_code
+ )
+ if(error_code)
+ message(FATAL_ERROR "Failed to fetch repository '@git_repository@'")
+ endif()
+
+ if(is_remote_ref)
+ # Check if stash is needed
+ execute_process(
+ COMMAND "@git_EXECUTABLE@" status --porcelain
+ WORKING_DIRECTORY "@work_dir@"
+ RESULT_VARIABLE error_code
+ OUTPUT_VARIABLE repo_status
+ )
+ if(error_code)
+ message(FATAL_ERROR "Failed to get the status")
+ endif()
+ string(LENGTH "${repo_status}" need_stash)
+
+ # If not in clean state, stash changes in order to be able to perform a
+ # rebase or checkout without losing those changes permanently
+ if(need_stash)
+ execute_process(
+ COMMAND "@git_EXECUTABLE@" stash save @git_stash_save_options@
+ WORKING_DIRECTORY "@work_dir@"
+ RESULT_VARIABLE error_code
+ )
+ if(error_code)
+ message(FATAL_ERROR "Failed to stash changes")
+ endif()
+ endif()
+
+ if("@git_update_strategy@" STREQUAL "CHECKOUT")
+ execute_process(
+ COMMAND "@git_EXECUTABLE@" checkout "${git_remote}/${git_tag}"
+ WORKING_DIRECTORY "@work_dir@"
+ RESULT_VARIABLE error_code
+ )
+ if(error_code)
+ message(FATAL_ERROR "Failed to checkout tag: '${git_remote}/${git_tag}'")
+ endif()
+ else()
+ # Pull changes from the remote branch
+ execute_process(
+ COMMAND "@git_EXECUTABLE@" rebase "${git_remote}/${git_tag}"
+ WORKING_DIRECTORY "@work_dir@"
+ RESULT_VARIABLE error_code
+ OUTPUT_VARIABLE rebase_output
+ ERROR_VARIABLE rebase_output
+ )
+ if(error_code)
+ # Rebase failed, undo the rebase attempt before continuing
+ execute_process(
+ COMMAND "@git_EXECUTABLE@" rebase --abort
+ WORKING_DIRECTORY "@work_dir@"
+ )
+
+ if(NOT "@git_update_strategy@" STREQUAL "REBASE_CHECKOUT")
+ # Not allowed to do a checkout as a fallback, so cannot proceed
+ if(need_stash)
+ execute_process(
+ COMMAND "@git_EXECUTABLE@" stash pop --index --quiet
+ WORKING_DIRECTORY "@work_dir@"
+ )
+ endif()
+ message(FATAL_ERROR "\nFailed to rebase in: '@work_dir@'."
+ "\nOutput from the attempted rebase follows:"
+ "\n${rebase_output}"
+ "\n\nYou will have to resolve the conflicts manually")
+ endif()
+
+ # Fall back to checkout. We create an annotated tag so that the user
+ # can manually inspect the situation and revert if required.
+ # We can't log the failed rebase output because MSVC sees it and
+ # intervenes, causing the build to fail even though it completes.
+ # Write it to a file instead.
+ string(TIMESTAMP tag_timestamp "%Y%m%dT%H%M%S" UTC)
+ set(tag_name _cmake_ExternalProject_moved_from_here_${tag_timestamp}Z)
+ set(error_log_file ${CMAKE_CURRENT_LIST_DIR}/rebase_error_${tag_timestamp}Z.log)
+ file(WRITE ${error_log_file} "${rebase_output}")
+ message(WARNING "Rebase failed, output has been saved to ${error_log_file}"
+ "\nFalling back to checkout, previous commit tagged as ${tag_name}")
+ execute_process(
+ COMMAND "@git_EXECUTABLE@" tag -a
+ -m "ExternalProject attempting to move from here to ${git_remote}/${git_tag}"
+ ${tag_name}
+ WORKING_DIRECTORY "@work_dir@"
+ RESULT_VARIABLE error_code
+ )
+ if(error_code)
+ message(FATAL_ERROR "Failed to add marker tag")
+ endif()
+
+ execute_process(
+ COMMAND "@git_EXECUTABLE@" checkout "${git_remote}/${git_tag}"
+ WORKING_DIRECTORY "@work_dir@"
+ RESULT_VARIABLE error_code
+ )
+ if(error_code)
+ message(FATAL_ERROR "Failed to checkout : '${git_remote}/${git_tag}'")
+ endif()
+
+ endif()
+ endif()
+
+ if(need_stash)
+ execute_process(
+ COMMAND "@git_EXECUTABLE@" stash pop --index --quiet
+ WORKING_DIRECTORY "@work_dir@"
+ RESULT_VARIABLE error_code
+ )
+ if(error_code)
+ # Stash pop --index failed: Try again dropping the index
+ execute_process(
+ COMMAND "@git_EXECUTABLE@" reset --hard --quiet
+ WORKING_DIRECTORY "@work_dir@"
+ RESULT_VARIABLE error_code
+ )
+ execute_process(
+ COMMAND "@git_EXECUTABLE@" stash pop --quiet
+ WORKING_DIRECTORY "@work_dir@"
+ RESULT_VARIABLE error_code
+ )
+ if(error_code)
+ # Stash pop failed: Restore previous state.
+ execute_process(
+ COMMAND "@git_EXECUTABLE@" reset --hard --quiet ${head_sha}
+ WORKING_DIRECTORY "@work_dir@"
+ )
+ execute_process(
+ COMMAND "@git_EXECUTABLE@" stash pop --index --quiet
+ WORKING_DIRECTORY "@work_dir@"
+ )
+ message(FATAL_ERROR "\nFailed to unstash changes in: '@work_dir@'."
+ "\nYou will have to resolve the conflicts manually")
+ endif()
+ endif()
+ endif()
+ else()
+ execute_process(
+ COMMAND "@git_EXECUTABLE@" checkout "${git_tag}"
+ WORKING_DIRECTORY "@work_dir@"
+ RESULT_VARIABLE error_code
+ )
+ if(error_code)
+ message(FATAL_ERROR "Failed to checkout tag: '${git_tag}'")
+ endif()
+ endif()
+
+ set(init_submodules "@init_submodules@")
+ if(init_submodules)
+ execute_process(
+ COMMAND "@git_EXECUTABLE@" submodule update @git_submodules_recurse@ --init @git_submodules@
+ WORKING_DIRECTORY "@work_dir@"
+ RESULT_VARIABLE error_code
+ )
+ endif()
+ if(error_code)
+ message(FATAL_ERROR "Failed to update submodules in: '@work_dir@'")
+ endif()
+endif()
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