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|
#!/bin/sh
#
# Generate some basic versioning information which can be piped to a header.
#
# Copyright (c) 2006-2007 Luc Verhaegen <libv@skynet.be>
# Copyright (C) 2007 Hans Ulrich Niedermann <hun@n-dimensional.de>
#
# The author thanks the nice people on #git for the assistance!
#
# Simple testing of this script:
# env SED="/sbin/busybox sed" \
# /sbin/busybox sh git-buildmsg --example > moo.c \
# && gcc -Wall -Wextra -Wno-unused -o moo moo.c \
# && ./moo
# (bash and other seds should also do)
#
# Ideas:
# * Output for languages other than C (Erlang, Python, Perl, sh, ...)
# The caller may have found these programs for us
SED="${SED-sed}"
# Initialize
GIT_DIR=".git"
working_dir="$(pwd)"
# Who am I?
self="$(basename "$0")"
# Defaults
ifndef_symbol="GIT_VERSION_H"
outfile="-"
print_example=false
srcdir="$(pwd)"
# Parse command line parameter, affecting defaults
while [ "x$1" != "x" ]
do
case "$1" in
--example)
print_example=:
;;
-o|--output)
if shift; then
outfile="$1"
if [ "x$outfile" = "x-" ]; then
: # keep default ifndef_symbol
else
ifndef_symbol=`basename "$outfile" | $SED 's|\.|_|g; s|[^A-Za-z0-9_]||g' | tr a-z A-Z`
fi
else
echo "$self: Fatal: \"$1\" option requires parameter." >&2
exit 1
fi
;;
--version)
echo "$self (@PACKAGE_NAME@) @PACKAGE_VERSION@"
exit
;;
--help)
echo "Supported params: --help, --example, -o|--output"
exit
;;
-s|--srcdir)
if shift; then
if test -d "$1"; then
srcdir="$1"
else
echo "$self: Fatal: \"$1\" not a directory."
exit 1
fi
else
echo "$self: Fatal: \"$1\" option requires directory parameter."
exit 1
fi
;;
*)
echo "$self: Fatal: Invalid command line paramenter: \"$1\"" >&2
exit 1
;;
esac
shift
done
# If not printing to stdout, redirect stdout to output file
rename_new_output=false
if [ "x$outfile" = "x-" ]
then
: # keep using stdout
else
exec 1> "${outfile}.new"
fi
# Done with creating output files, so we can change to source dir
cd "$srcdir"
# Write program header
cat<<EOF
/*
* Basic versioning gathered from the git repository.
* Automatically generated by ${self}.
*/
#ifndef ${ifndef_symbol}
#define ${ifndef_symbol} 1
EOF
# Detect git tools (should work with old and new git versions)
git_found=yes
for git_tool in git-symbolic-ref git-rev-parse git-diff-files git-diff-index
do
[ x`which $git_tool 2>/dev/null` = "x" ] && { git_found=no; break; }
done
# Determine and write git specific defines
if [ "x$git_found" = "xyes" ]; then
if [ -e "$GIT_DIR/index" ]; then
echo "/* This is a git repository */"
echo "#define GIT_USED 1"
echo ""
# Commit SHA-ID
git_shaid=`git-rev-parse HEAD | $SED -n 's/^\(.\{8\}\).*/\1/p'`
echo "/* Git SHA ID of last commit */"
echo "#define GIT_SHAID \"${git_shaid}..\""
echo ""
# Branch
git_branch=`git-symbolic-ref HEAD | $SED -n 's|^refs/heads/||p'`
echo "/* Branch this tree is on */"
echo "#define GIT_BRANCH \"$git_branch\""
echo ""
# Any uncommitted changes we should know about?
# Or technically: Are the working tree or index dirty?
if git-diff-files --quiet && git-diff-index --cached --quiet HEAD; then
echo "/* SHA-ID uniquely defines the state of this code */"
echo "#undef GIT_UNCOMMITTED"
else
echo "/* Local changes might be breaking things */"
echo "#define GIT_UNCOMMITTED 1"
fi
else
echo "/* This is not a git repository */"
echo "#undef GIT_USED"
fi
else
echo "/* git is not installed */"
echo "#undef GIT_USED"
fi
# Define a few immediately useful message strings
cat<<EOF
/* Define GIT_MESSAGE such that
* printf("%s: built from %s", argv[0], GIT_MESSAGE);
* forms a proper sentence.
*/
#ifdef GIT_USED
# ifdef GIT_UNCOMMITTED
# define GIT_WITH_WITHOUT_UNCOMMITTED " + changes"
# else
# define GIT_WITH_WITHOUT_UNCOMMITTED ""
# endif /* GIT_UNCOMMITTED */
# define GIT_MESSAGE \\
"git branch " GIT_BRANCH ", " \\
"commit " GIT_SHAID GIT_WITH_WITHOUT_UNCOMMITTED
#else
# define GIT_MESSAGE "non-git sources"
#endif /* GIT_USED */
#endif /* ${ifndef_symbol} */
EOF
# Example program
if "$print_example"
then
cat<<EOF
/* example program demonstrating the use of git_version.sh output */
#include <stdio.h>
#include <string.h>
int main(int argc, char *argv[])
{
const char *const idx = strrchr(argv[0], '/');
const char *const prog = (idx)?(idx+1):(argv[0]);
#ifdef PACKAGE_VERSION
printf("%s: version %s, built from %s\n", prog, PACKAGE_VERSION, GIT_MESSAGE);
#elif defined(GIT_USED)
printf("%s: built from %s\n", prog, GIT_MESSAGE);
#endif
return 0;
}
EOF
fi
# Change back to working dir for the remaining output file manipulations.
cd "$working_dir"
# If necessary, overwrite outdated output file with new one
if [ "x$outfile" != "x-" ]
then
if [ -f "$outfile" ]; then
if cmp "$outfile" "$outfile.new" > /dev/null; then
echo "$self: Output is unchanged, keeping $outfile" >&2
rm -f "$outfile.new"
else
echo "$self: Output has changed, updating $outfile" >&2
mv -f "$outfile.new" "$outfile"
fi
else
mv -f "$outfile.new" "$outfile"
fi
fi
# THE END.
|
