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Use shallow clone for git repositories by default (#129) (#130)

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* Use shallow clone for git repositories by default (#129)

* use shallow clone for git repositories by default

* remove trailing spaces

* Enable shallow clone for actual tags

* Support short commit hash

* Enable shallow only when downloading dependencies into cache

* Always honor user specified GIT_SHALLOW opiton
This commit is contained in:
Kingsley Chen
2020-06-15 15:27:26 +08:00
committed by GitHub
parent 139d3cacba
commit 392b2a864b
2 changed files with 64 additions and 13 deletions
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29
cmake/CPM.cmake
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@@ -191,6 +191,7 @@ function(CPMAddPackage)
DOWNLOAD_COMMAND
FIND_PACKAGE_ARGUMENTS
NO_CACHE
GIT_SHALLOW
)
set(multiValueArgs
@@ -230,6 +231,10 @@ function(CPMAddPackage)
if (DEFINED CPM_ARGS_GIT_TAG)
list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS GIT_TAG ${CPM_ARGS_GIT_TAG})
# If GIT_SHALLOW is explicitly specified, honor the value.
if (DEFINED CPM_ARGS_GIT_SHALLOW)
list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS GIT_SHALLOW ${CPM_ARGS_GIT_SHALLOW})
endif()
endif()
# Check if package has been added before
@@ -309,6 +314,15 @@ function(CPMAddPackage)
list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS DOWNLOAD_COMMAND "${CMAKE_COMMAND}")
set(PACKAGE_INFO "${download_directory}")
else()
# Enable shallow clone when GIT_TAG is not a commit hash.
# Our guess may not be accurate, but it should guarantee no commit hash get mis-detected.
if (NOT DEFINED CPM_ARGS_GIT_SHALLOW)
cpm_is_git_tag_commit_hash(${CPM_ARGS_GIT_TAG} IS_HASH)
if (NOT ${IS_HASH})
list(APPEND CPM_ARGS_UNPARSED_ARGUMENTS GIT_SHALLOW TRUE)
endif()
endif()
# remove timestamps so CMake will re-download the dependency
file(REMOVE_RECURSE ${CMAKE_BINARY_DIR}/_deps/${lower_case_name}-subbuild)
set(PACKAGE_INFO "${PACKAGE_INFO} -> ${download_directory}")
@@ -474,3 +488,18 @@ function(cpm_get_version_from_git_tag GIT_TAG RESULT)
SET(${RESULT} ${CMAKE_MATCH_1} PARENT_SCOPE)
endif()
endfunction()
# guesses if the git tag is a commit hash or an actual tag or a branch nane.
function(cpm_is_git_tag_commit_hash GIT_TAG RESULT)
string(LENGTH ${GIT_TAG} length)
# full hash has 40 characters, and short hash has at least 7 characters.
if (length LESS 7 OR length GREATER 40)
SET(${RESULT} 0 PARENT_SCOPE)
else()
if (${GIT_TAG} MATCHES "^[a-fA-F0-9]+$")
SET(${RESULT} 1 PARENT_SCOPE)
else()
SET(${RESULT} 0 PARENT_SCOPE)
endif()
endif()
endfunction()

22
test/unit/is_git_tag_commit_hash.cmake Normal file
View File

@@ -0,0 +1,22 @@
cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
include(${CPM_PATH}/CPM.cmake)
include(${CPM_PATH}/testing.cmake)
CPM_IS_GIT_TAG_COMMIT_HASH("v1.2.3" RESULT)
ASSERT_EQUAL("0" ${RESULT})
CPM_IS_GIT_TAG_COMMIT_HASH("asio-1-12-1" RESULT)
ASSERT_EQUAL("0" ${RESULT})
CPM_IS_GIT_TAG_COMMIT_HASH("513039e3cba83284cec71287fd829865b9f423bc" RESULT)
ASSERT_EQUAL("1" ${RESULT})
CPM_IS_GIT_TAG_COMMIT_HASH("513039E3CBA83284CEC71287FD829865B9F423BC" RESULT)
ASSERT_EQUAL("1" ${RESULT})
CPM_IS_GIT_TAG_COMMIT_HASH("513039E" RESULT)
ASSERT_EQUAL("1" ${RESULT})
CPM_IS_GIT_TAG_COMMIT_HASH("513039E3CBA8" RESULT)
ASSERT_EQUAL("1" ${RESULT})