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# 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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