8000 Add INCLUDE_IN_GC to operate on selected images only by fabriziodemaria · Pull Request #160 · spotify/docker-gc · GitHub
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Add INCLUDE_IN_GC to operate on selected images only #160

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Add INCLUDE_IN_GC to operate on selected images only #160

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36 changes: 33 additions & 3 deletions docker-gc
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Original file line number Diff line number Diff line change
Expand Up @@ -73,13 +73,20 @@ then
EXCLUDE_FROM_GC=/dev/null
fi

INCLUDE_IN_GC=${INCLUDE_IN_GC:=/etc/docker-gc-include}
if [ ! -f "$INCLUDE_IN_GC" ]
then
INCLUDE_IN_GC=/dev/null
fi

EXCLUDE_CONTAINERS_FROM_GC=${EXCLUDE_CONTAINERS_FROM_GC:=/etc/docker-gc-exclude-containers}
if [ ! -f "$EXCLUDE_CONTAINERS_FROM_GC" ]
then
EXCLUDE_CONTAINERS_FROM_GC=/dev/null
fi

EXCLUDE_IDS_FILE="exclude_ids"
INCLUDE_IDS_FILE="include_ids"
EXCLUDE_CONTAINER_IDS_FILE="exclude_container_ids"

function date_parse {
Expand Down Expand Up @@ -132,6 +139,21 @@ function compute_exclude_ids() {
| sed 's/^/^(sha256:)?/' > $EXCLUDE_IDS_FILE
}

function compute_include_ids() {
# Find images that match patterns in the INCLUDE_IN_GC file and put their
# id prefixes into $INCLUDE_IDS_FILE, prefixed with ^

PROCESSED_INCLUDES="processed_includes.tmp"
sed 's/^\(.*\)$/ \1 /' $INCLUDE_IN_GC | sed '/^ *$/d' > $PROCESSED_INCLUDES

$DOCKER images \
| tail -n+2 \
| sed 's/^\([^ ]*\) *\([^ ]*\) *\([^ ]*\).*/ \1:\2 \3 /' \
| grep -f $PROCESSED_INCLUDES 2>/dev/null \
| cut -d' ' -f3 \
| sed 's/^/^(sha256:)?/' > $INCLUDE_IDS_FILE
}

function compute_exclude_container_ids() {
# Find containers matching to patterns listed in EXCLUDE_CONTAINERS_FROM_GC file
# Implode their values with a \| separator on a single line
Expand Down Expand Up @@ -202,6 +224,9 @@ container_log "Container running" containers.running
# compute ids of container images to exclude from GC
compute_exclude_ids

# compute ids of container images to include in GC
compute_include_ids

# compute ids of containers to exclude from GC
compute_exclude_container_ids

Expand All @@ -211,7 +236,7 @@ comm -23 containers.all containers.running > containers.exited
if [[ $EXCLUDE_DEAD -gt 0 ]]; then
echo "Excluding dead containers"
# List dead containers
$DOCKER ps -q -a -f status=dead | sort | uniq > containers.dead
$DOCKER ps -q -a -f status=dead | sort | uniq > containers.dead
comm -23 containers.exited containers.dead > containers.exited.tmp
cat containers.exited.tmp > containers.exited
fi
Expand Down Expand Up @@ -253,7 +278,13 @@ do
echo $line >> images.reap.tmp
fi
done
comm -23 images.reap.tmp images.used | grep -E -v -f $EXCLUDE_IDS_FILE > images.reap || true

if [ -s $INCLUDE_IDS_FILE ]
then
comm -23 images.reap.tmp images.used | grep -E -v -f $EXCLUDE_IDS_FILE | grep -E -f $INCLUDE_IDS_FILE > images.reap || true
else
comm -23 images.reap.tmp images.used | grep -E -v -f $EXCLUDE_IDS_FILE > images.reap || true
fi

# Use -f flag on docker rm command; forces removal of images that are in Dead
# status or give errors when removing.
Expand Down Expand Up @@ -282,4 +313,3 @@ else
image_log "Removing image" images.reap
xargs -n 1 $DOCKER rmi $FORCE_IMAGE_FLAG < images.reap &>/dev/null || true
fi

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