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evaluate-changed-paths.sh
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evaluate-changed-paths.sh
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#!/usr/bin/env bash
# Disable globbing in this bash script since we iterate over path patterns
set -f
# Stop script if unbound variable found (use ${var:-} if intentional)
set -u
# Stop script if command returns non-zero exit code.
# Prevents hidden errors caused by missing error code propagation.
set -e
usage()
{
echo "Script that evaluates changed paths and emits an azure devops variable if the changes contained in the current HEAD against the difftarget meet the includepahts/excludepaths filters:"
echo " --difftarget <value> SHA or branch to diff against. (i.e: HEAD^1, origin/main, 0f4hd36, etc.)"
echo " --excludepaths <value> Escaped list of paths to exclude from diff separated by '+'. (i.e: 'src/libraries/*+'src/installer/*')"
echo " --includepaths <value> Escaped list of paths to include on diff separated by '+'. (i.e: 'src/libraries/System.Private.CoreLib/*')"
echo " --subset Subset name for which we're evaluating in order to include it in logs"
echo " --azurevariable Name of azure devops variable to create if change meets filter criteria"
echo ""
echo "Arguments can also be passed in with a single hyphen."
}
source="${BASH_SOURCE[0]}"
# resolve $source until the file is no longer a symlink
while [[ -h "$source" ]]; do
scriptroot="$( cd -P "$( dirname "$source" )" && pwd )"
source="$(readlink "$source")"
# if $source was a relative symlink, we need to resolve it relative to the path where the
# symlink file was located
[[ $source != /* ]] && source="$scriptroot/$source"
done
scriptroot="$( cd -P "$( dirname "$source" )" && pwd )"
eng_root=`cd -P "$scriptroot" && pwd`
exclude_paths=()
include_paths=()
subset_name=''
azure_variable=''
diff_target=''
while [[ $# > 0 ]]; do
opt="$(echo "${1/#--/-}" | tr "[:upper:]" "[:lower:]")"
case "$opt" in
-help|-h)
usage
exit 0
;;
-difftarget)
diff_target=$2
shift
;;
-excludepaths)
IFS='+' read -r -a tmp <<< $2
exclude_paths+=(${tmp[@]})
shift
;;
-includepaths)
IFS='+' read -r -a tmp <<< $2
include_paths+=(${tmp[@]})
shift
;;
-subset)
subset_name=$2
shift
;;
-azurevariable)
azure_variable=$2
shift
;;
esac
shift
done
ci=true # Needed in order to use pipeline-logging-functions.sh
. "$eng_root/common/pipeline-logging-functions.sh"
# -- expected args --
# $@: git diff arguments
customGitDiff() {
(
set -x
git diff -M -C -b --ignore-cr-at-eol --ignore-space-at-eol "$@"
)
}
# runs git diff with supplied filter.
# -- exit codes --
# 0: No match was found
# 1: At least 1 match was found
#
# -- expected args --
# $@: filter string
probePathsWithExitCode() {
local _filter=$@
echo ""
customGitDiff --exit-code --quiet $diff_target -- $_filter
}
# -- expected args --
# $@: filter string
printMatchedPaths() {
local _subset=$subset_name
local _filter=$@
echo ""
echo "----- Matching files for $_subset -----"
customGitDiff --name-only $diff_target -- $_filter
}
probePaths() {
local _subset=$subset_name
local _azure_devops_var_name=$azure_variable
local exclude_path_string=""
local include_path_string=""
local found_applying_changes=false
if [[ ${#exclude_paths[@]} -gt 0 ]]; then
echo ""
echo "******* Probing $_subset exclude paths *******";
for _path in "${exclude_paths[@]}"; do
echo "$_path"
if [[ -z "$exclude_path_string" ]]; then
exclude_path_string=":!$_path"
else
exclude_path_string="$exclude_path_string :!$_path"
fi
done
if ! probePathsWithExitCode $exclude_path_string; then
found_applying_changes=true
printMatchedPaths $exclude_path_string
fi
fi
if [[ $found_applying_changes != true && ${#include_paths[@]} -gt 0 ]]; then
echo ""
echo "******* Probing $_subset include paths *******";
for _path in "${include_paths[@]}"; do
echo "$_path"
if [[ -z "$include_path_string" ]]; then
include_path_string=":$_path"
else
include_path_string="$include_path_string :$_path"
fi
done
if ! probePathsWithExitCode $include_path_string; then
found_applying_changes=true
printMatchedPaths $include_path_string
fi
fi
if [[ $found_applying_changes == true ]]; then
echo ""
echo "Setting pipeline variable $_azure_devops_var_name=true"
Write-PipelineSetVariable -name $_azure_devops_var_name -value true -is_multi_job_variable true
else
echo ""
echo "No changed files for $_subset"
fi
}
probePaths