#! /usr/bin/env bash

# Use fpm to package up files into a DEB .

# Usage:
#   mk_deb_fpmdir PACKAGENAME MANIFEST1 MANIFEST2 ...

# Example:
#   Make a package foopkg manifest.txt
# Where "manifest.txt" contains:
#   exec /usr/bin/stack_makefqdn  misc/stack_makefqdn.py
#   exec /usr/bin/bar             bar/bar.sh
#   read /usr/man/man1/bar.1      bar/bar.1.man
#   0444 /etc/foo.conf            bar/foo.conf

set -e

# Parameters for this DEB:
PACKAGENAME=${1?"First arg must be the package name."}
shift

# Defaults that can be overridden:
# All packages are 1.0 unless otherwise specifed:
: ${PKGVERSION:=1.0} ;
# If there is no iteration setting, assume "1":
: ${PKGRELEASE:=1}
# If there is no epoch, assume 0
: ${PKGEPOCH:=0}

# The DEB is output here: (should be a place that can be wiped)
OUTPUTDIR="${HOME}/debbuild-$PACKAGENAME"
# The TeamCity templates expect to find the list of artifacts here:
DEB_BIN_LIST="${OUTPUTDIR}/bin-packages.txt"

# -- Now the real work can be done.

# Clean the output dir.
rm -rf "$OUTPUTDIR"
mkdir -p "$OUTPUTDIR/installroot"

# Copy the files into place:
set -o pipefail  # Error out if any manifest is not found.
cat """$@""" | while read -a arr ; do
  PERM="${arr[0]}"
  case $PERM in
    \#*)  continue ;;   # Skip comments.
    exec) PERM=0755 ;;
    read) PERM=0744 ;;
    *) ;;
  esac
  DST="$OUTPUTDIR/installroot/${arr[1]}"
  SRC="${arr[2]}"
  if [[ $SRC == "cmd/"* || $SRC == *"/cmd/"* ]]; then
    ( cd $(dirname "$SRC" ) && go build -a -v ) 
  fi
  install -D -T -b -m "$PERM" -T "$SRC" "$DST"
done

# Build the DEB:
cd "$OUTPUTDIR" && fpm -s dir -t deb \
  -a x86_64 \
  -n "${PACKAGENAME}" \
  --epoch "${PKGEPOCH}" \
  --version "${PKGVERSION}" \
  --iteration "${PKGRELEASE}" \
  ${PKGDESCRIPTION:+ --description="${PKGDESCRIPTION}"} \
  ${PKGVENDOR:+ --vendor="${PKGVENDOR}"} \
  -C "$OUTPUTDIR/installroot" \
  .

# TeamCity templates for DEBS expect to find
# the list of all packages created in bin-packages.txt.
# Generate that list:
find "$OUTPUTDIR" -maxdepth 1 -name '*.deb' >"$DEB_BIN_LIST"
# Output it for debugging purposes:
cat "$DEB_BIN_LIST"