support/download/bzr

   1 #!/usr/bin/env bash
   2
   3 # We want to catch any unexpected failure, and exit immediately
   4 set -e
   5
   6 # Download helper for bzr, to be called from the download wrapper script
   7 #
   8 # Call it as:
   9 #   .../bzr [-q] OUT_FILE REPO_URL REV BASENAME
  10 #
  11 # Environment:
  12 #   BZR      : the bzr command to call
  13
  14
  15 verbose=
  16 while getopts :q OPT; do
  17     case "${OPT}" in
  18     q)  verbose=-q;;
  19     \?) printf "unknown option '%s'\n" "${OPTARG}" >&2; exit 1;;
  20     esac
  21 done
  22 shift $((OPTIND-1))
  23
  24 output="${1}"
  25 repo="${2}"
  26 rev="${3}"
  27 basename="${4}"
  28
  29 shift 4 # Get rid of our options
  30
  31 # Caller needs to single-quote its arguments to prevent them from
  32 # being expanded a second time (in case there are spaces in them)
  33 _bzr() {
  34     eval ${BZR} "${@}"
  35 }
  36
  37 # --per-file-timestamps comes with bzr-2.2 (released August 2010),
  38 # so only pass it if bzr is recent enough. We compute versions as:
  39 # major*1000 + minor
  40 bzr_min_version=2002
  41 bzr_version=$(($(bzr --version |
  42                  sed -r -n 's/^Bazaar \(bzr\) ([[:digit:]]+)\.([[:digit:]]+)\..*$/\1*1000+\2/p')
  43              ))
  44
  45 # If the version is recent enough, we can generate reproducible
  46 # archives; otherwise, we just hope for the best (as it would
  47 # be downloaded from the BR mirror if what we generate here does
  48 # not match the hash we have for it).
  49 if [ ${bzr_version} -ge ${bzr_min_version} ]; then
  50     timestamp_opt="--per-file-timestamps"
  51 fi
  52
  53 _bzr export ${verbose} --root="'${basename}/'" --format=tgz \
  54     ${timestamp_opt} - "${@}" "'${repo}'" -r "'${rev}'" \
  55     >"${output}"