make_patchnum.sh

   1 #!/bin/sh
   2
   3 # this script is used to regenerate a number of special build files
   4 # based on either information contained in a file called .patch or
   5 # directly from git.
   6 # The files involved are:
   7 #   .patchnum         # information about the current checkout
   8 #   lib/Config_git.pl # holds some special configure settings related to git
   9 #   unpushed.h        # header file used by patchlevel.h to store unpushed commits
  10
  11 config_file="lib/Config_git.pl"
  12 header_file="git_version.h"
  13 patch_file=".patch"
  14
  15 git_dir=`git rev-parse --git-dir 2>/dev/null`
  16 existing_config=`cat $config_file 2>/dev/null`
  17 existing_header=`cat $header_file 2>/dev/null`
  18
  19 unpushed_commits='/*no-op*/'
  20 if [ -s $patch_file ] ; then
  21         # this is the minimal expectation for the
  22         read branch snapshot_created commit_id describe < .patch
  23         changed=""
  24         extra_info="git_snapshot_date='$snapshot_created'"
  25         commit_title='Snapshot of:'
  26 elif [ -n "$git_dir" ]; then
  27         branch=`git branch | awk 'BEGIN{ORS=""} /^\* [^(]/ { print $2 }'`
  28         test -n "$branch" && remote=`git config branch.$branch.remote`
  29         test -n "$branch" && merge=`git config branch.$branch.merge | sed s,refs/heads/,,`
  30         commit_id=`git rev-parse HEAD`
  31         changed=`git diff-index --name-only HEAD`
  32         describe=`git describe --tags`
  33         commit_created=`git log -1 --pretty='format:%ci'`
  34         extra_info="git_commit_date='$commit_created'"
  35         if [ -n "$merge" ] && [ -n "$remote" ]; then
  36                 unpushed_commit_list=`git cherry $remote/$merge | awk 'BEGIN{ORS=","} /\+/ {print $2}' | sed -e 's/,$//'`
  37                 unpushed_commits=`git cherry $remote/$merge | awk 'BEGIN{ORS="\t\\\\\n"} /\+/ {print ",\"" $2 "\""}'`
  38
  39                 if [ -n "$unpushed_commits" ]; then
  40                         commit_title="Local Commit:"
  41                         ancestor=`git rev-parse $remote/$merge`
  42                         extra_info="$extra_info
  43 git_ancestor='$ancestor'
  44 git_remote_branch='$remote/$merge'
  45 git_unpushed='$unpushed_commit_list'"
  46                 fi
  47
  48         fi
  49 else
  50         cat <<SNDOGS
  51 Something is wrong with your source tree. You should
  52 either have a .git directory and a functional git toolset
  53 OR should have a .patch file in the source tree. Please
  54 report the particulars of this situation to
  55 perl5-porters@perl.org.
  56 SNDOGS
  57         exit 2
  58 fi
  59
  60 # Set up defaults for various values
  61 if [ -n "$changed" ]; then
  62         changed="true"
  63         commit_title="Derived from:"
  64         status="#define PERL_GIT_UNCOMMITTED_CHANGES uncommitted-changes"
  65 else
  66         status="/* clean working directory */"
  67 fi
  68 test -z "$commit_title" && commit_title='Commit id:'
  69
  70 new_header=`cat <<EOFTEXT
  71 /***************************************************************************
  72 * WARNING: $header_file is automatically generated by make_patchnum.sh
  73 *          DO NOT EDIT DIRECTLY - edit make_patchnum.sh instead
  74 ****************************************************************************/
  75 #define PERL_PATCHNUM $describe
  76 $status
  77 #define PERL_GIT_UNPUSHED_COMMITS       $unpushed_commits
  78 /*leave-this-comment*/
  79 EOFTEXT
  80 `
  81 new_config=`cat <<EOFDATA
  82 #######################################################################
  83 # WARNING: $config_file is generated by make_patchnum.sh
  84 #          DO NOT EDIT DIRECTLY - edit make_patchnum.sh instead
  85 #######################################################################
  86 \\$Config::Git_Data=<<'ENDOFGIT';
  87 git_commit_id='$commit_id'
  88 git_describe='$describe'
  89 git_branch='$branch'
  90 git_uncommitted_changes='$changed'
  91 git_commit_id_title='$commit_title'
  92 $extra_info
  93 ENDOFGIT
  94 EOFDATA
  95 `
  96 # only update the files if necessary, other build product depends on these files
  97 if [ "$new_config" != "$existing_config" ] || [ "$existing_header" != "$new_header" ]; then
  98         echo "Updating $header_file and $config_file"
  99         echo "$new_config" > $config_file
 100         echo "$new_header" > $header_file
 101 else
 102         echo "Reusing $header_file and $config_file"
 103 fi
 104