#!/bin/sh -ef
# Turn an installed package into a CPT tarball

## SYNOPSIS:
## .Nm
## .Op Ar pkg

## DESCRIPTION:
## .Nm
## creates a package tarball of an installed package using the system files
## declared on the package's manifest. If no package name is given,
## .Nm
## will use the name of the current directory as the package.

case "$1" in
    --help|-h)
        printf 'usage: %s [pkg]\n' "${0##*/}"
        exit 0
        ;;
    '') set -- "${PWD##*/}"
esac

cpt-list "${1:-null}" >/dev/null

# Grab the package's version..
read -r ver rel 2>/dev/null < \
    "$CPT_ROOT/var/db/cpt/installed/$1/version"

### Environment variables:
### The compression method can be changed while creating a tarball, using the
### .Ev CPT_COMPRESS
### environment variable.

# Fallback to gzip if there is a typo
case "$CPT_COMPRESS" in bz2|gz|xz|zst) ;; *) CPT_COMPRESS=gz; esac

# Reset the argument list.
pkg=$1
tarball="$PWD/$1#$ver-$rel.tar.$CPT_COMPRESS"
set --

# Construct the argument list using each file.
eval set -- "$(sed '/\/$/d;s|^|".|;s|$|"|' \
    "$CPT_ROOT/var/db/cpt/installed/$pkg/manifest" | tr '\n' ' ')"

# Turn the list of files back into a package.
cd "$CPT_ROOT/"
tar cf - -- "$@" |

case "$CPT_COMPRESS" in
    bz2) bzip2 -z ;;
    gz)  gzip -6  ;;
    xz)  xz -zT 0 ;;
    zst) zstd -3  ;;
esac > "$tarball"

printf 'tarball created in %s\n' "$tarball"