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-rwxr-xr-xt/perf/repos/inflate-repo.sh85
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diff --git a/t/perf/repos/inflate-repo.sh b/t/perf/repos/inflate-repo.sh
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+#!/bin/sh
+# Inflate the size of an EXISTING repo.
+#
+# This script should be run inside the worktree of a TEST repo.
+# It will use the contents of the current HEAD to generate a
+# commit containing copies of the current worktree such that the
+# total size of the commit has at least <target_size> files.
+#
+# Usage: [-t target_size] [-b branch_name]
+
+set -e
+
+target_size=10000
+branch_name=p0006-ballast
+ballast=ballast
+
+while test "$#" -ne 0
+do
+ case "$1" in
+ -b)
+ shift;
+ test "$#" -ne 0 || { echo 'error: -b requires an argument' >&2; exit 1; }
+ branch_name=$1;
+ shift ;;
+ -t)
+ shift;
+ test "$#" -ne 0 || { echo 'error: -t requires an argument' >&2; exit 1; }
+ target_size=$1;
+ shift ;;
+ *)
+ echo "error: unknown option '$1'" >&2; exit 1 ;;
+ esac
+done
+
+git ls-tree -r HEAD >GEN_src_list
+nr_src_files=$(cat GEN_src_list | wc -l)
+
+src_branch=$(git symbolic-ref --short HEAD)
+
+echo "Branch $src_branch initially has $nr_src_files files."
+
+if test $target_size -le $nr_src_files
+then
+ echo "Repository already exceeds target size $target_size."
+ rm GEN_src_list
+ exit 1
+fi
+
+# Create well-known branch and add 1 file change to start
+# if off before the ballast.
+git checkout -b $branch_name HEAD
+echo "$target_size" > inflate-repo.params
+git add inflate-repo.params
+git commit -q -m params
+
+# Create ballast for in our branch.
+copy=1
+nr_files=$nr_src_files
+while test $nr_files -lt $target_size
+do
+ sed -e "s| | $ballast/$copy/|" <GEN_src_list |
+ git update-index --index-info
+
+ nr_files=$(expr $nr_files + $nr_src_files)
+ copy=$(expr $copy + 1)
+done
+rm GEN_src_list
+git commit -q -m "ballast"
+
+# Modify 1 file and commit.
+echo "$target_size" >> inflate-repo.params
+git add inflate-repo.params
+git commit -q -m "ballast plus 1"
+
+nr_files=$(git ls-files | wc -l)
+
+# Checkout master to put repo in canonical state (because
+# the perf test may need to clone and enable sparse-checkout
+# before attempting to checkout a commit with the ballast
+# (because it may contain 100K directories and 1M files)).
+git checkout $src_branch
+
+echo "Repository inflated. Branch $branch_name has $nr_files files."
+
+exit 0