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buildsystem: replace $(cat file) with faster alternative

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See: https://www.gnu.org/software/bash/manual/html_node/Command-Substitution.html

"
...
Bash performs the expansion by executing command in a subshell environment and replacing
the command substitution with the standard output of the command, with any trailing newlines
deleted. Embedded newlines are not deleted, but they may be removed during word splitting. The
command substitution $(cat file) can be replaced by the equivalent but faster $(< file).
"

Testing indicates var=$(< file) is twice as fast as var=$(cat file).
This commit is contained in:
MilhouseVH 2019-05-29 00:49:26 +01:00
parent 0eb36d786b
commit 04b8036e32
2 changed files with 5 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
config/functions
View File

@ -1264,7 +1264,7 @@ pkg_lock() {
# As we now have the lock, if .failed still exists then a previous process must have failed
if [ -f "${THREAD_CONTROL}/locks/${pkg}.${task}.failed" ]; then
fail_seq="$(cat "${THREAD_CONTROL}/locks/${pkg}.${task}.failed")"
fail_seq="$(< "${THREAD_CONTROL}/locks/${pkg}.${task}.failed")"
print_color CLR_ERROR "FAILURE: ${pkg}.${task}.failed exists, a previous dependency process has failed (seq: ${fail_seq})\n"
if [ -d "${THREAD_CONTROL}/logs" ]; then
cat <<EOF
@ -1325,12 +1325,12 @@ update_dashboard() {
num=$(cat "${THREAD_CONTROL}/status" | wc -l)
while [ ${num} -lt ${sedline} ]; do echo "" >>"${THREAD_CONTROL}/status"; num=$((num + 1)); done
num=$(($(cat "${THREAD_CONTROL}/progress.prev") + 1))
num=$(< "${THREAD_CONTROL}/progress.prev")
projdevarch="${PROJECT}/"
[ -n "${DEVICE}" ] && projdevarch+="${DEVICE}/"
projdevarch+="${TARGET_ARCH}"
TZ=UTC0 printf -v elapsed "%(%H:%M:%S)T" $(($(date +%s) - MTBUILDSTART))
printf -v preamble "%s Dashboard (%s) - %d of %d jobs completed, %s elapsed" "${DISTRONAME}" "${projdevarch}" ${num} ${MTMAXJOBS} "${elapsed}"
printf -v preamble "%s Dashboard (%s) - %d of %d jobs completed, %s elapsed" "${DISTRONAME}" "${projdevarch}" $((num + 1)) ${MTMAXJOBS} "${elapsed}"
printf -v preamble "%b%-105s %s" "\e[2J\e[0;0H" "${preamble//\//\\/}" "$(date "+%Y-%m-%d %H:%M:%S")"
if [ "${DISABLE_COLORS}" != "yes" ]; then

3
config/multithread
View File

@ -107,8 +107,9 @@ package_worker() {
(
flock --exclusive 95
[ ${result} -eq 0 ] && status="DONE" || status="FAIL"
num=$(($(cat "${THREAD_CONTROL}/progress") + 1))
num=$(< "${THREAD_CONTROL}/progress")
mv "${THREAD_CONTROL}/progress" "${THREAD_CONTROL}/progress.prev"
num=$((num + 1))
echo ${num} >"${THREAD_CONTROL}/progress"
printf "[%0*d/%0*d] [%-4s] %-7s %s\n" ${#jobs} ${num} ${#jobs} ${jobs} "${status}" "${task}" "${pkgname}" >&2
) 95>"${THREAD_CONTROL}/locks/.progress"