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#!/bin/bash -euE
. pbs-plumb-shlib
cmd=${0##*/}
usage() {
echo "Usage: $cmd [OPTIONS] REPOSITORY OLDPACKAGE REPO/NEWPACKAGE"
echo 'Forks a package.'
echo ''
echo 'To fork a local package, (for example, making `pcr/emacs-lucid`'
echo 'from `pcr/emacs-lucid`), the repository is the local filesystem,'
echo 'so use `./`'
echo ''
echo ' $cmd ./ emacs pcr/emacs-lucid'
echo ''
echo 'This forks the branch `packages/emacs` into a new branch'
echo '`packages/emacs-lucid`, creates the file `pbstrack` in it, and'
echo 'checks it out as a git submodule to the directory '
echo '`prc/emacs-lucid`.'
echo ''
echo 'Use `pbs-merge` to pull updates from the original package.'
echo ''
echo 'Options:'
echo ' -h Show this message'
}
main() {
while getopts 'h' arg; do
case $arg in
h) usage; return 0;;
*) usage; return 1;;
esac
done
shift $(($OPTIND - 1))
if [[ $# != 3 ]]; then
usage
return 1
fi
local repository=$1
local oldpackage=$2
local dest=$3
local newpackage="${dest##*/}"
cdto_pbs-root
git submodule add -b "packages/${oldpackage}" "${repository}" "${dest}"
cd "${dest}"
git checkout -b "packages/${newpackage}"
echo "${repository} packages/${oldpkackage}" > pbstrack
git add pbstrack
git commit -m "Fork package from ${repository} ${oldpackage} to ${dest}"
}
main "$@"
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