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 # Caller needs to single-quote its arguments to prevent them from
  30 # being expanded a second time (in case there are spaces in them)
  31 _bzr() {
  32     eval ${BZR} "${@}"
  33 }
  34
  35 # --per-file-timestamps comes with bzr-2.2 (released August 2010),
  36 # so only pass it if bzr is recent enough. We compute versions as:
  37 # major*1000 + minor
  38 bzr_min_version=2002
  39 bzr_version=$(($(bzr --version |
  40                  sed -r -n 's/^Bazaar \(bzr\) ([[:digit:]]+)\.([[:digit:]]+)\..*$/\1*1000+\2/p')
  41              ))
  42
  43 # If the version is recent enough, we can generate reproducible
  44 # archives; otherwise, we just hope for the best (as it would
  45 # be downloaded from the BR mirror if what we generate here does
  46 # not match the hash we have for it).
  47 if [ ${bzr_version} -ge ${bzr_min_version} ]; then
  48     timestamp_opt="--per-file-timestamps"
  49 fi
  50
  51 _bzr export ${verbose} --root="'${basename}/'" --format=tgz \
  52     ${timestamp_opt} - "'${repo}'" -r "'${rev}'" \
  53     >"${output}"