kbuild: Clean up and speed up the localversion logic
[linux-2.6.git] / scripts / setlocalversion
1 #!/bin/sh
2 #
3 # This scripts adds local version information from the version
4 # control systems git, mercurial (hg) and subversion (svn).
5 #
6 # If something goes wrong, send a mail the kernel build mailinglist
7 # (see MAINTAINERS) and CC Nico Schottelius
8 # <nico-linuxsetlocalversion -at- schottelius.org>.
9 #
10 #
11
12 usage() {
13         echo "Usage: $0 [--scm-only] [srctree]" >&2
14         exit 1
15 }
16
17 scm_only=false
18 srctree=.
19 if test "$1" = "--scm-only"; then
20         scm_only=true
21         shift
22 fi
23 if test $# -gt 0; then
24         srctree=$1
25         shift
26 fi
27 if test $# -gt 0 -o ! -d "$srctree"; then
28         usage
29 fi
30
31 scm_version()
32 {
33         local short=false
34
35         cd "$srctree"
36         if test -e .scmversion; then
37                 cat "$_"
38                 return
39         fi
40         if test "$1" = "--short"; then
41                 short=true
42         fi
43
44         # Check for git and a git repo.
45         if head=`git rev-parse --verify --short HEAD 2>/dev/null`; then
46
47                 # If we are at a tagged commit (like "v2.6.30-rc6"), we ignore
48                 # it, because this version is defined in the top level Makefile.
49                 if [ -z "`git describe --exact-match 2>/dev/null`" ]; then
50
51                         # If only the short version is requested, don't bother
52                         # running further git commands
53                         if $short; then
54                                 echo "+"
55                                 return
56                         fi
57                         # If we are past a tagged commit (like
58                         # "v2.6.30-rc5-302-g72357d5"), we pretty print it.
59                         if atag="`git describe 2>/dev/null`"; then
60                                 echo "$atag" | awk -F- '{printf("-%05d-%s", $(NF-1),$(NF))}'
61
62                         # If we don't have a tag at all we print -g{commitish}.
63                         else
64                                 printf '%s%s' -g $head
65                         fi
66                 fi
67
68                 # Is this git on svn?
69                 if git config --get svn-remote.svn.url >/dev/null; then
70                         printf -- '-svn%s' "`git svn find-rev $head`"
71                 fi
72
73                 # Update index only on r/w media
74                 [ -w . ] && git update-index --refresh --unmerged > /dev/null
75
76                 # Check for uncommitted changes
77                 if git diff-index --name-only HEAD | grep -v "^scripts/package" \
78                     | read dummy; then
79                         printf '%s' -dirty
80                 fi
81
82                 # All done with git
83                 return
84         fi
85
86         # Check for mercurial and a mercurial repo.
87         if hgid=`hg id 2>/dev/null`; then
88                 tag=`printf '%s' "$hgid" | cut -d' ' -f2`
89
90                 # Do we have an untagged version?
91                 if [ -z "$tag" -o "$tag" = tip ]; then
92                         id=`printf '%s' "$hgid" | sed 's/[+ ].*//'`
93                         printf '%s%s' -hg "$id"
94                 fi
95
96                 # Are there uncommitted changes?
97                 # These are represented by + after the changeset id.
98                 case "$hgid" in
99                         *+|*+\ *) printf '%s' -dirty ;;
100                 esac
101
102                 # All done with mercurial
103                 return
104         fi
105
106         # Check for svn and a svn repo.
107         if rev=`svn info 2>/dev/null | grep '^Last Changed Rev'`; then
108                 rev=`echo $rev | awk '{print $NF}'`
109                 printf -- '-svn%s' "$rev"
110
111                 # All done with svn
112                 return
113         fi
114 }
115
116 collect_files()
117 {
118         local file res
119
120         for file; do
121                 case "$file" in
122                 *\~*)
123                         continue
124                         ;;
125                 esac
126                 if test -e "$file"; then
127                         res="$res$(cat "$file")"
128                 fi
129         done
130         echo "$res"
131 }
132
133 if $scm_only; then
134         scm_version
135         exit
136 fi
137
138 if test -e include/config/auto.conf; then
139         source "$_"
140 else
141         echo "Error: kernelrelease not valid - run 'make prepare' to update it"
142         exit 1
143 fi
144
145 # localversion* files in the build and source directory
146 res="$(collect_files localversion*)"
147 if test ! "$srctree" -ef .; then
148         res="$res$(collect_files "$srctree"/localversion*)"
149 fi
150
151 # CONFIG_LOCALVERSION and LOCALVERSION (if set)
152 res="${res}${CONFIG_LOCALVERSION}${LOCALVERSION}"
153
154 # scm version string if not at a tagged commit
155 if test "$CONFIG_LOCALVERSION_AUTO" = "y"; then
156         # full scm version string
157         res="$res$(scm_version)"
158 else
159         # apped a plus sign if the repository is not in a clean tagged
160         # state and  LOCALVERSION= is not specified
161         if test "${LOCALVERSION+set}" != "set"; then
162                 scm=$(scm_version --short)
163                 res="$res${scm:++}"
164         fi
165 fi
166
167 echo "$res"