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67 lines
1.6 KiB
Bash
Executable File
67 lines
1.6 KiB
Bash
Executable File
#!/bin/bash
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# Rebuild a cached docker image if the input files have changed.
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# Usage: ./rebuild-image <image name> <image dir> <image files...>
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set -eux
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IMAGENAME=$1
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# shellcheck disable=SC2001
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SAVEDNAME=$(echo "$IMAGENAME" | sed "s/[\/\-]/\./g")
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IMAGEDIR=$2
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shift 2
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INPUTFILES=( "$@" )
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CACHEDIR=$HOME/docker/
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# Rebuild the image
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rebuild() {
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mkdir -p "$CACHEDIR"
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rm "$CACHEDIR/$SAVEDNAME"* || true
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docker build -t "$IMAGENAME" "$IMAGEDIR"
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docker save "$IMAGENAME:latest" | gzip - > "$CACHEDIR/$SAVEDNAME-$CIRCLE_SHA1.gz"
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}
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# Get the revision the cached image was build at
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cached_image_rev() {
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find "$CACHEDIR" -name "$SAVEDNAME-*" -type f | sed -n 's/^[^\-]*\-\([a-z0-9]*\).gz$/\1/p'
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}
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# Have there been any revision between $1 and $2
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has_changes() {
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local rev1=$1
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local rev2=$2
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local changes
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changes=$(git diff --oneline "$rev1..$rev2" -- "${INPUTFILES[@]}" | wc -l)
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[ "$changes" -gt 0 ]
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}
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commit_timestamp() {
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local rev=$1
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git show -s --format=%ct "$rev"
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}
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cached_revision=$(cached_image_rev)
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if [ -z "$cached_revision" ]; then
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echo ">>> No cached image found; rebuilding"
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rebuild
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exit 0
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fi
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echo ">>> Found cached image rev $cached_revision"
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if has_changes "$cached_revision" "$CIRCLE_SHA1" ; then
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echo ">>> Found changes, rebuilding"
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rebuild
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exit 0
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fi
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IMAGE_TIMEOUT="$(( 3 * 24 * 60 * 60 ))"
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if [ "$(commit_timestamp "$cached_revision")" -lt "${IMAGE_TIMEOUT}" ]; then
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echo ">>> Image is more the 24hrs old; rebuilding"
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rebuild
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exit 0
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fi
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# we didn't rebuild; import cached version
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echo ">>> No changes found, importing cached image"
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zcat "$CACHEDIR/$SAVEDNAME-$cached_revision.gz" | docker load
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