Blame get_sources.sh

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#!/bin/bash
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#
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# Might want to drop this in ~/bin/ and chmod u+x it
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#
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#  Initial Author: Karanbir Singh <kbsingh@centos.org>
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#         Updates:
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#                  Mike McLean <mikem@redhat.com>
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#                  Pat Riehecky <riehecky@fnal.gov>
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#                  Tyler Parsons <tparsons@fnal.gov>
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#####################################################################
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usage() {
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    echo ''                                               >&2
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    echo "$0 [-hcq] [-b branch] [--surl url]"             >&2
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    echo ''                                               >&2
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    echo 'Script to parse the non-text sources metadata file'   >&2
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    echo ' and download the required files from the lookaside'  >&2
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    echo ' cache.'                                              >&2
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    echo ''                                                     >&2
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    echo 'PLEASE NOTE: this script is non-destructive, it wont' >&2
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    echo ' replace files that already exist, regardless of'     >&2
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    echo ' their state, allowing you to have work-in-progress'  >&2
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    echo ' content that wont get overwritten.'                  >&2
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    echo ''                                                     >&2
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    echo 'You need to run this from inside a sources git repo'  >&2
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    echo ''                                               >&2
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    echo ' -h: This help message'                         >&2
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    echo ''                                               >&2
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    echo "  $0 -b c7"                                     >&2
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    echo "  $0 -q -b c7"                                  >&2
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    echo "  $0 -c -b remotes/origin/c7"                   >&2
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    echo "  $0 -c -b c7 --surl '$SURL'"                   >&2
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    echo "  $0"                                           >&2
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    exit 1
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}
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#####################################################################
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SURL="https://git.centos.org/sources"
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QUIET=0
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BRANCH=''
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CHECK=0
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# for setting any overrides, such as SURL, default BRANCH, or force CHECK
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if [ -f /etc/centos-git-common ]; then
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  . /etc/centos-git-common
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fi
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#####################################################################
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# setup args in the right order for making getopt evaluation
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# nice and easy.  You'll need to read the manpages for more info
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# utilizing 'while' construct rather than 'for arg' to avoid unnecessary
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# shifting of program args
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args=$(getopt -o hcqb: -l surl: -- "$@")
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eval set -- "$args"
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while [[ 0 -eq 0 ]]; do
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    case $1 in
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        -- )
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            # end of getopt args, shift off the -- and get out of the loop
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            shift
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            break
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           ;;
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         -c )
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            # verify the sha1sum of the downloaded file
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            CHECK=1
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            shift
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           ;;
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         -q )
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            # suppress warnings
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            QUIET=1
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            shift
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           ;;
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         -b )
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            # Check this particular branch 
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            BRANCH=$2
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            shift
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            shift
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           ;;
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         --surl )
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            # override sources url
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            SURL=$2
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            shift
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            shift
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           ;;
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         -h )
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            # get help
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            usage
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           ;;
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    esac
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done
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# set curl options this way so defaults can be set in /etc/centos-git-common
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# across multiple scripts
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if [[ ${QUIET} -eq 1 ]]; then
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    QUIET='--silent'
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else
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    QUIET=''
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fi
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which git >/dev/null 2>&1
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if [[ $? -ne 0 ]]; then
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    echo 'You need git in PATH' >&2
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    exit 1
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fi
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which curl >/dev/null 2>&1
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if [[ $? -ne 0 ]]; then
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    echo 'You need curl in PATH' >&2
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    exit 1
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fi
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# should go into a function section at some point
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weakHashDetection () {
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  strHash=${1};
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  case $((`echo ${strHash}|wc -m` - 1 )) in
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    128)
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      hashBin='sha512sum'
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      ;;
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    64)
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      hashBin='sha256sum'
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      ;;
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    40)
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      hashBin='sha1sum'
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      ;;
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    32)
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      hashBin='md5sum'
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      ;;
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    *)
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      hashBin='unknown'
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      ;;
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  esac
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  echo ${hashBin};
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}
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# check metadata file and extract package name
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shopt -s nullglob
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set -- .*.metadata
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if (( $# == 0 ))
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then
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    echo 'Missing metadata. Please run from inside a sources git repo' >&2
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    exit 1
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elif (( $# > 1 ))
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then
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    echo "Warning: multiple metadata files found. Using $1"
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fi
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meta=$1
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pn=${meta%.metadata}
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pn=${pn#.}
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if [ ! -d .git ] || [ ! -d SPECS ]; then
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  echo 'You need to run this from inside a sources git repo' >&2
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  exit 1
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fi
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mkdir -p SOURCES
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# sort out our branch
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if [ -n "$BRANCH" ]
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then
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  branches=("$BRANCH")
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else
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  # generate a list of all branches containing current HEAD
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  branches=()
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  while IFS='' read -r line
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  do
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    # input from: git branch --contains HEAD
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    branch="${line:2}"
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    if [[ "$branch" =~ "detached from" ]]
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    then
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      # ignore detached heads
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      continue
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    fi
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    if [ ".${line:0:1}" = ".*" ]
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    then
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      # current branch, put it first
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      branches=("$branch" "${branches[@]}")
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    else
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      branches=("${branches[@]}" "$branch")
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    fi
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  done <<< "$(git branch --contains HEAD)"
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fi
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while read -r fsha fname ; do
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  if [ ".${fsha}" = ".da39a3ee5e6b4b0d3255bfef95601890afd80709" ]; then
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    # zero byte file
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    touch ${fname}
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  else
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    if [ ${CHECK} -eq 1 ]; then
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      hashType=$(weakHashDetection ${fsha})
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      if [ "${hashType}" == "unknown" ]; then
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        echo 'Failure: Hash type unknown.' >&2
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        exit 1;
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      else
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        which ${hashType} >/dev/null 2>&1
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        if [[ $? -ne 0 ]]; then
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          echo "Failure: You need ${hashType} in PATH." >&2
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          exit 1;
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        fi
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      fi
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    fi
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    if [ ! -e "${fname}" ]; then
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      for br in "${branches[@]}"
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      do
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        br=$(echo ${br}| sed -e s'|remotes/origin/||')
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        curl ${QUIET} -f "${SURL}/${pn}/${br}/${fsha}" -o "${fname}" && break
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      done
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    else
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      echo "${fname} exists. skipping"
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    fi
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    if [ ${CHECK} -eq 1 ]; then
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        downsum=$(${hashType} ${fname} | awk '{print $1}')
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        if [ "${fsha}" != "${downsum}" ]; then
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            rm -f ${fname}
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            echo "Failure: ${fname} hash does not match hash from the .metadata file" >&2
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            exit 1;
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        fi
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    fi
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  fi
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done < "${meta}"