[LLVMdev] [PATCH] CMake add_version_info_from_vcs SVN_REPOSITORY

[Adam Strzelecki]

This will be used by Clang to show full build information when
LLVM_APPEND_VC_REV is enabled and LLVM/Clang are built from Git.

Also try to figure-out repository URL and revision from Git mirror parsing
git-svn-id: footer from last commit (if present).
---
 cmake/modules/VersionFromVCS.cmake | 55 ++++++++++++++++++++++++++++----------
 1 file changed, 41 insertions(+), 14 deletions(-)

diff --git a/cmake/modules/VersionFromVCS.cmake b/cmake/modules/VersionFromVCS.cmake
index 26314d4..4e140e9 100644
--- a/cmake/modules/VersionFromVCS.cmake
+++ b/cmake/modules/VersionFromVCS.cmake
@@ -1,9 +1,13 @@
 # Adds version control information to the variable VERS. For
 # determining the Version Control System used (if any) it inspects the
-# existence of certain subdirectories under CMAKE_CURRENT_SOURCE_DIR.
+# existence of certain subdirectories under CMAKE_CURRENT_SOURCE_DIR
+# or optional 2nd argument.
 
 function(add_version_info_from_vcs VERS)
   string(REPLACE "svn" "" result "${${VERS}}")
+  if( ARGV1 )
+    set(CMAKE_CURRENT_SOURCE_DIR "${ARGV1}")
+  endif()
   if( EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/.svn" )
     set(result "${result}svn")
     # FindSubversion does not work with symlinks. See PR 8437
@@ -14,15 +18,16 @@ function(add_version_info_from_vcs VERS)
       subversion_wc_info( ${CMAKE_CURRENT_SOURCE_DIR} Project )
       if( Project_WC_REVISION )
         set(SVN_REVISION ${Project_WC_REVISION} PARENT_SCOPE)
+        set(SVN_REPOSITORY ${Project_WC_URL} PARENT_SCOPE)
         set(result "${result}-r${Project_WC_REVISION}")
       endif()
     endif()
   elseif( EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/.git )
     set(result "${result}git")
-    # Try to get a ref-id
-    if( EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/.git/svn )
-      find_program(git_executable NAMES git git.exe git.cmd)
-      if( git_executable )
+    find_program(git_executable NAMES git git.exe git.cmd)
+    if( git_executable )
+      # Try to get a ref-id
+      if( EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/.git/svn )
         set(is_git_svn_rev_exact false)
         execute_process(COMMAND ${git_executable} svn log --limit=1 --oneline
           WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
@@ -36,7 +41,16 @@ function(add_version_info_from_vcs VERS)
           string(SUBSTRING "${git_svn_rev}" 1 ${rev_length} git_svn_rev_number)
           set(SVN_REVISION ${git_svn_rev_number} PARENT_SCOPE)
           set(git_svn_rev "-svn-${git_svn_rev}")
-
+          # Get repository URL
+          execute_process(COMMAND ${git_executable} svn info --url
+            WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+            TIMEOUT 5
+            RESULT_VARIABLE git_result
+            OUTPUT_VARIABLE git_output)
+          if( git_result EQUAL 0 )
+            string(STRIP "${git_output}" git_svn_info_url)
+            set(SVN_REPOSITORY ${git_svn_info_url} PARENT_SCOPE)
+          endif()
           # Determine if the HEAD points directly at a subversion revision.
           execute_process(COMMAND ${git_executable} svn find-rev HEAD
             WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
@@ -52,20 +66,33 @@ function(add_version_info_from_vcs VERS)
         else()
           set(git_svn_rev "")
         endif()
-        execute_process(COMMAND
-          ${git_executable} rev-parse --short HEAD
+      else() # Figure out revision and URL from last commit footer
+        execute_process(COMMAND ${git_executable} log -1 --pretty=format:%b
           WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
           TIMEOUT 5
           RESULT_VARIABLE git_result
           OUTPUT_VARIABLE git_output)
-        if( git_result EQUAL 0 AND NOT is_git_svn_rev_exact )
-          string(STRIP "${git_output}" git_ref_id)
-          set(GIT_COMMIT ${git_ref_id} PARENT_SCOPE)
-          set(result "${result}${git_svn_rev}-${git_ref_id}")
-        else()
-          set(result "${result}${git_svn_rev}")
+        if( git_result EQUAL 0 AND
+            git_output MATCHES "^(.*\n)?git-svn-id: ([^@]*)@([0-9]+)" )
+          set(SVN_REVISION ${CMAKE_MATCH_3} PARENT_SCOPE)
+          set(SVN_REPOSITORY ${CMAKE_MATCH_2} PARENT_SCOPE)
+          set(git_svn_rev "-svn-r${CMAKE_MATCH_3}")
+          set(is_git_svn_rev_exact true)
         endif()
       endif()
+      execute_process(COMMAND
+        ${git_executable} rev-parse --short HEAD
+        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+        TIMEOUT 5
+        RESULT_VARIABLE git_result
+        OUTPUT_VARIABLE git_output)
+      if( git_result EQUAL 0 AND NOT is_git_svn_rev_exact )
+        string(STRIP "${git_output}" git_ref_id)
+        set(GIT_COMMIT ${git_ref_id} PARENT_SCOPE)
+        set(result "${result}${git_svn_rev}-${git_ref_id}")
+      else()
+        set(result "${result}${git_svn_rev}")
+      endif()
     endif()
   endif()
   set(${VERS} ${result} PARENT_SCOPE)
-- 
1.8.5.2 (Apple Git-48)