A universal bash script for installing with apt-get and yum - linux

Question

I'm trying to write a simple bash wrapper which abstracts yum and apt-get. Basically so we can do something like universal-install curl Here is what I have so far:
# universal-install
package=$1
apt=`command -v apt-get`
yum=`command -v yum`
if [ -n "$apt" ]; then
apt-get update
apt-get -y install $package
elif [ -n "$yum" ]; then
yum -y install $package
else
echo "Err: no path to apt-get or yum" >&2;
exit 1;
fi
Are there any errors or improvements/optimizations that can be made?

Answer 1

Take a look at how pacapt detects the OS:
# Detect package type from /etc/issue
_found_arch() {
local _ostype="$1"
shift
grep -qis "$*" /etc/issue && _OSTYPE="$_ostype"
}
# Detect package type
_OSTYPE_detect() {
_found_arch PACMAN "Arch Linux" && return
_found_arch DPKG "Debian GNU/Linux" && return
_found_arch DPKG "Ubuntu" && return
_found_arch YUM "CentOS" && return
_found_arch YUM "Red Hat" && return
_found_arch YUM "Fedora" && return
_found_arch ZYPPER "SUSE" && return
[[ -z "$_OSTYPE" ]] || return
# See also https://github.com/icy/pacapt/pull/22
# Please not that $OSTYPE (which is `linux-gnu` on Linux system)
# is not our $_OSTYPE. The choice is not very good because
# a typo can just break the logic of the program.
if [[ "$OSTYPE" != "darwin"* ]]; then
_error "Can't detect OS type from /etc/issue. Running fallback method."
fi
[[ -x "/usr/bin/pacman" ]] && _OSTYPE="PACMAN" && return
[[ -x "/usr/bin/apt-get" ]] && _OSTYPE="DPKG" && return
[[ -x "/usr/bin/yum" ]] && _OSTYPE="YUM" && return
[[ -x "/opt/local/bin/port" ]] && _OSTYPE="MACPORTS" && return
command -v brew >/dev/null && _OSTYPE="HOMEBREW" && return
[[ -x "/usr/bin/emerge" ]] && _OSTYPE="PORTAGE" && return
[[ -x "/usr/bin/zypper" ]] && _OSTYPE="ZYPPER" && return
if [[ -z "$_OSTYPE" ]]; then
_error "No supported package manager installed on system"
_error "(supported: apt, homebrew, pacman, portage, yum)"
exit 1
fi
}
As you can see it first checks /etc/issue, then failing that the script looks for the associated executable file for each package manager.
But heck, why not just use pacapt, instead of rolling your own?

Answer 2

If you're going to do this, why require the user to tell the script which tool to use?
#!/bin/bash
# Find our package manager
if VERB="$( which apt-get )" 2> /dev/null; then
echo "Debian-based"
elif VERB="$( which yum )" 2> /dev/null; then
echo "Modern Red Hat-based"
elif VERB="$( which portage )" 2> /dev/null; then
echo "Gentoo-based"
elif VERB="$( which pacman )" 2> /dev/null; then
echo "Arch-based"
else
echo "I have no idea what I'm doing." >&2
exit 1
fi
if [[ 1 -ne $# ]]; then
echo "Syntax: $0 PACKAGE"
exit 1
fi
$VERB "$1"
exit $?
Slightly better would to to look at /etc/issue to see what your distribution is and behave accordingly.

Answer 3

I was looking for a one-liner to install a package and couldn't find any so this was my final version:
if [ "" == "`which unzip`" ]; then echo "Unzip Not Found"; if [ -n "`which apt-get`" ]; then apt-get -y install unzip ; elif [ -n "`which yum`" ]; then yum -y install unzip ; fi ; fi
It's specific for the unzip package, but can be altered to any other package that is available on apt-get/yum.
Hope this will help someone :)

Answer 4

#!/bin/bash
# file: src/bash/aspark-starter/install-prerequisites-for-aspark-starter.sh
# caveat package names are for Ubuntu !!!
set -eu -o pipefail # fail on error , debug all lines
# run as root
[ "${USER:-}" = "root" ] || exec sudo "$0" "$#"
echo "=== $BASH_SOURCE on $(hostname -f) at $(date)" >&2
echo installing the must-have pre-requisites
while read -r p ; do
if [ "" == "`which $p`" ];
then echo "$p Not Found";
if [ -n "`which apt-get`" ];
then apt-get install -y $p ;
elif [ -n "`which yum`" ];
then yum -y install $p ;
fi ;
fi
done < <(cat << "EOF"
perl
zip unzip
exuberant-ctags
mutt
libxml-atom-perl
postgresql-9.6
libdbd-pgsql
curl
wget
libwww-curl-perl
EOF
)
echo installing the nice-to-have pre-requisites
echo you have 5 seconds to proceed ...
echo or
echo hit Ctrl+C to quit
echo -e "\n"
sleep 6
echo installing the nice to-have pre-requisites
while read -r p ; do
if [ "" == "`which $p`" ];
then echo "$p Not Found";
if [ -n "`which apt-get`" ];
then apt-get install -y $p ;
elif [ -n "`which yum`" ];
then yum -y install $p ;
fi ;
fi
done < <(cat << "EOF"
tig
EOF
)