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# GNU parallel dependency. | ||
apps/ | ||
src/ | ||
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# Input file. | ||
copy_input_dirs | ||
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# Output files. | ||
logs/ | ||
copy.joblog | ||
copy.log |
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Create full backup of gpfs2 at /gpfs/scratchfs1/gpfs2_full_backup/ | ||
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Run `copy` to do this. |
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# -*- mode: sh;-*- | ||
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# Copy all gpfs2 home and shared data to /scratch/gpfs2_full_backup. | ||
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# Global variables | ||
#----------------- | ||
file_dirlist=./copy_input_dirs | ||
file_sentinel=ORIG_COPY_TO_SCRATCH_COMPLETED | ||
dir_logs=logs | ||
log=copy.log | ||
joblog=copy.joblog | ||
np=6 # parallel rsync processes to run. | ||
prefix_src=/gpfs/gpfs2 | ||
prefix_dest=/gpfs/scratchfs1/gpfs2_full_backup | ||
parallel=apps/bin/parallel | ||
simulate= # test without copying. | ||
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# Functions | ||
#---------- | ||
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# Generate file with list of directories to be copied. This is | ||
# necessary to "parallelize" rsync. | ||
create_dirlist() { | ||
# Find does not order directories, so do not generate the file if | ||
# it already exists to preserve the copying order and support | ||
# predictable resuming. | ||
if ! [[ -f $file_list ]]; then | ||
find $prefix_src/{home,shared} \ | ||
-mindepth 1 \ | ||
-maxdepth 1 \ | ||
-type d \ | ||
> $file_dirlist | ||
fi | ||
# Ensure target sub-directories exist with same ownership, | ||
# permissions and modification times as source sub-directories. | ||
for dir in home shared; do | ||
src=$prefix_src/$dir | ||
dest=$prefix_dest/$dir | ||
mkdir -p $dest | ||
chown --reference=$src $dest | ||
chmod --reference=$src $dest | ||
touch --reference=$src $dest | ||
done | ||
} | ||
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# Prefix timestamp before "echo" message | ||
msg() { | ||
echo "[$(date '+%Y-%m-%dT%H:%M:%S')] $1" | ||
} | ||
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# Copy a single directory. | ||
copy_dir() { | ||
local src dest | ||
src=$1 | ||
dest=${src/#$prefix_src/$prefix_dest} | ||
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msg "Started copying directory $src -> $dest" | ||
if ! [[ -z "$simulate" ]]; then | ||
sleep $(( ( $RANDOM % 3 ) + 1 ))s | ||
else | ||
path_sentinel=$dest/$file_sentinel | ||
if [[ -f $path_sentinel ]]; then | ||
msg "Skipping already copied directory $dest" | ||
else | ||
rsync -aX $src $dest 2>&1 | ||
touch $path_sentinel | ||
fi | ||
fi | ||
msg "Finished copying directory $src -> $dest" | ||
} | ||
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# Use GNU parallel to parallelize copying instead of xargs, because | ||
# GNU parallel has nicer support for running exported bash functions | ||
# which allows us to have a single, self-contained script. | ||
copy_dirs() { | ||
# Export bash functions and variables for GNU parallel to inherit | ||
# with --env. | ||
export -f copy_dir msg | ||
export simulate prefix_src prefix_dest file_sentinel | ||
# Use --line-buffer so that output lines don't split. | ||
cat $file_dirlist | | ||
$parallel \ | ||
--will-cite \ | ||
--env \ | ||
--line-buffer \ | ||
--max-args 1 \ | ||
--max-procs $np \ | ||
--output-as-files \ | ||
--results $dir_logs/{} \ | ||
--eta \ | ||
--joblog $joblog \ | ||
copy_dir | ||
} | ||
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# Main | ||
#----- | ||
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main() { | ||
msg "---" | ||
msg "BEGIN copy" | ||
create_dirlist | ||
copy_dirs | ||
msg "END copy" | ||
} | ||
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# Boilerplate for running `main()`. | ||
[[ "$0" != "$BASH_SOURCE" ]] || main "$@" #|& tee -a $log |