POSIX shell support #56
Description
It would be good to not have bash as a dependency and to use #!/usr/bin/env sh instead for cross platform support.
I've made some headway with this which I'll paste below but it's beyond my shell scripting skills.
#!/usr/bin/env sh
set -eu
## Functions/
usage() {
cat << EOF
SYNOPSIS
gpm leverages the power of the go get command and the underlying version
control systems used by it to set your Go dependencies to desired versions,
thus allowing easily reproducible builds in your Go projects.
A Godeps file in the root of your Go application is expected containing
the import paths of your packages and a specific tag or commit hash
from its version control system, an example Godeps file looks like this:
$ cat Godeps
# This is a comment
github.com/nu7hatch/gotrail v0.0.2
github.com/replicon/fast-archiver v1.02 #This is another comment!
github.com/nu7hatch/gotrail 2eb79d1f03ab24bacbc32b15b75769880629a865
gpm has a companion tool, called [gvp](https://github.com/pote/gvp) which
provides vendoring functionalities, it alters your GOPATH so every project
has its own isolated dependency directory, its usage is recommended.
USAGE
$ gpm # Same as 'install'.
$ gpm install # Parses the Godeps file, installs dependencies and sets
# them to the appropriate version.
$ gpm version # Outputs version information
$ gpm help # Prints this message
EOF
}
is_in_use() {
[ -e "$1/.git/index.lock" -o -e "$1/.hg/store/lock" -o -e "$1/.bzr/checkout/lock" ]
}
# Iterates over Godep file dependencies and sets
# the specified version on each of them.
set_dependencies() {
local deps=$(sed 's/#.*//;/^\s*$/d' < $1) || echo ""
echo "$deps" | while read package version; do
(
echo ">> Getting package "$package""
go get -u -d "$package"
) &
done
wait
echo "$deps" | while read package version; do
(
local pkg_path=$(echo "$package" | awk -F/ '{print $1"/"$2"/"$3}')
local install_path="${GOPATH%%:*}/src/${pkg_path%%/...}"
echo ">> Setting $package to version $version"
cd $install_path
is_in_use $install_path && wait
[ -d .bzr ] && bzr revert -q -r "$version"
[ -d .git ] && git checkout -q "$version"
[ -d .hg ] && hg update -q "$version"
[ -d .svn ] && svn update -r "$version"
) &
done
wait
echo ">> All Done"
}
## /Functions
## Command Line Parsing
case "${1:-"install"}" in
"version")
echo ">> gpm v1.3.1"
;;
"install")
deps_file="${2:-"Godeps"}"
[ -r "$deps_file" ] || (echo ">> $deps_file file does not exist." && exit 1)
(which go > /dev/null) ||
( echo ">> Go is currently not installed or in your PATH" && exit 1)
set_dependencies $deps_file
;;
"help")
usage
;;
*)
## Support for Plugins: if command is unknown search for a gpm-command executable.
if command -v "gpm-$1" > /dev/null
then
plugin=$1 &&
shift &&
gpm-$plugin $@ &&
exit
else
echo ">> No command 'gpm $1'"
usage && exit 1
fi
;;
esac