81 lines
2.1 KiB
Bash
Executable File
81 lines
2.1 KiB
Bash
Executable File
#!/bin/sh
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set -e
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export LYRROOT="$(dirname "$(readlink -f "$0")")"
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export LYRREPO="${LYRREPO:-/usr/var/lyr}"
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[ -n "$1" ] || { \
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echo "
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usage: $(basename $0) <command> <layer name>
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commands:
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workdir
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returns the work directory path for the layer.
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upperdir
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returns the upper directory path for the layer.
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mountdir
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returns the mount directory path for the layer.
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mk
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create a new layer with the given name.
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rm
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unmount and delete the layer with the given name.
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up [<lower path>[:<lower path>]]
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mount the given layer with the given lower paths. print the mount path.
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dn
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unmount the given layer.
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" && exit 0; }
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# if this is running on an interactive
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# terminal (as opposed to in a script), if tput is installed, and if tput
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# knows some color codes, then set the color values.
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if [ -t 1 ] && [ "$(tput colors 2>/dev/null || echo 0)" -ge 8 ]; then
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_clr="$(tput sgr0)"
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_blu="$(tput setaf 6)"
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_ylw="$(tput setaf 3)"
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_red="$(tput setaf 1)"
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fi
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log() { echo "$_blu[LOG]$_clr $@"; }
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wrn() { echo "$_ylw[WRN]$_clr $@" >&2; }
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err() { echo "$_red[ERR]$_clr $@" >&2; exit 1; }
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case "$1" in
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workdir) echo "$LYRREPO/work/$2";;
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upperdir) echo "$LYRREPO/upper/$2";;
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mountdir) echo "$LYRREPO/mount/$2";;
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mk) mkdir -p "$LYRREPO/upper/$2";;
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rm)
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{ ! mountpoint -q "$LYRREPO/mount/$2" || umount "$LYRREPO/mount/$2"; } \
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&& rm -fr "$LYRREPO/upper/$2" "$LYRREPO/mount/$2" "$LYRREPO/work/$2"
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;;
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up)
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[ -n "$3" ] && { layer="$3" && lower="$2"; } || layer="$2"
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work="$LYRREPO/work/$layer"
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upper="$LYRREPO/upper/$layer"
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mnt="$LYRREPO/mount/$layer"
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[ -d "$upper" ] || err "layer '$layer' not recognized!"
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mkdir -p "$work" "$mnt"
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if [ -n "$lower" ]; then
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mount -t overlay -o lowerdir=$lower,upperdir=$upper,workdir=$work \
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none "$mnt"
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else
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mount -o bind "$upper" "$mnt"
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fi
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echo "$mnt"
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;;
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dn) umount "$LYRREPO/mount/$2" && rm -r "$LYRREPO/mount/$2";;
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*) err "unrecognized command '$1'";;
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esac
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