1 #!/bin/bash

     2 #

     3 # produces two repositories with different common and missing subsets

     4 #

     5 #   $ discovery-helper.sh REPO NBHEADS DEPT

     6 #

     7 # The Goal is to produce two repositories with some common part and some

     8 # exclusive part on each side. Provide a source repository REPO, it will

     9 # produce two repositories REPO-left and REPO-right.

    10 #

    11 # Each repository will be missing some revisions exclusive to NBHEADS of the

    12 # repo topological heads. These heads and revisions exclusive to them (up to

    13 # DEPTH depth) are stripped.

    14 #

    15 # The "left" repository will use the NBHEADS first heads (sorted by

    16 # description). The "right" use the last NBHEADS one.

    17 #

    18 # To find out how many topological heads a repo has, use:

    19 #

    20 #   $ hg heads -t -T '{rev}\n' | wc -l

    21 #

    22 # Example:

    23 #

    24 #  The `pypy-2018-09-01` repository has 192 heads. To produce two repositories

    25 #  with 92 common heads and ~50 exclusive heads on each side.

    26 #

    27 #    $ ./discovery-helper.sh pypy-2018-08-01 50 10

    28 

    29 set -euo pipefail

    30 

    31 if [ $# -lt 3 ]; then

    32      echo "usage: `basename $0` REPO NBHEADS DEPTH"

    33      exit 64

    34 fi

    35 

    36 repo="$1"

    37 shift

    38 

    39 nbheads="$1"

    40 shift

    41 

    42 depth="$1"

    43 shift

    44 

    45 leftrepo="${repo}-left"

    46 rightrepo="${repo}-right"

    47 

    48 left="first(sort(heads(all()), 'desc'), $nbheads)"

    49 right="last(sort(heads(all()), 'desc'), $nbheads)"

    50 

    51 leftsubset="ancestors($left, $depth) and only($left, heads(all() - $left))"

    52 rightsubset="ancestors($right, $depth) and only($right, heads(all() - $right))"

    53 

    54 echo '### building left repository:' $left-repo

    55 echo '# cloning'

    56 hg clone --noupdate "${repo}" "${leftrepo}"

    57 echo '# stripping' '"'${leftsubset}'"'

    58 hg -R "${leftrepo}" --config extensions.strip= strip --rev "$leftsubset" --no-backup

    59 

    60 echo '### building right repository:' $right-repo

    61 echo '# cloning'

    62 hg clone --noupdate "${repo}" "${rightrepo}"

    63 echo '# stripping:' '"'${rightsubset}'"'

    64 hg -R "${rightrepo}" --config extensions.strip= strip --rev "$rightsubset" --no-backup