64 lines
1.6 KiB
Bash
64 lines
1.6 KiB
Bash
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#
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# Settings and functions for shell scripts.
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#
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CONFIG_PARTITION=mmcblk0p2
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CONFIG_MOUNTPOINT=/mnt/cfg
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CONFIG_DIR=/var/lib/puzzlefw/cfg
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# Lock the configuration files.
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lock_config() {
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# Make config directory in RAM filesystem.
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mkdir -p $CONFIG_DIR
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# Create or open lock file.
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# The file remains open until the calling script ends.
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exec 3>>${CONFIG_DIR}/lockfile
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# Get exclusive lock on the file.
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if ! flock -n 3 ; then
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echo "ERROR: Configuration locked" >&2
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return 1
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fi
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}
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# Read configuration files from the SD card.
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# This is only used during boot.
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read_config() {
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# Mount config filesystem read-only.
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mkdir -p $CONFIG_MOUNTPOINT
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mount -t ext4 -r -o noatime,data=journal /dev/${CONFIG_PARTITION} $CONFIG_MOUNTPOINT || return 1
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# Copy config files to RAM filesystem.
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cp -a ${CONFIG_MOUNTPOINT}/*.conf $CONFIG_DIR
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umount $CONFIG_MOUNTPOINT
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}
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# Write changed configuration files to the SD card.
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# Parameters: names of config files to synchronize
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sync_config() {
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# Mount config filesystem.
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mkdir -p $CONFIG_MOUNTPOINT
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mount -t ext4 -o noatime,data=journal /dev/${CONFIG_PARTITION} $CONFIG_MOUNTPOINT || return 1
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for fname in "$@" ; do
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# Copy new version of file to SD card.
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cp ${CONFIG_DIR}/${fname}.new $CONFIG_MOUNTPOINT
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# Atomically replace the old file on the SD card.
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mv ${CONFIG_MOUNTPOINT}/${fname}.new ${CONFIG_MOUNTPOINT}/${fname}
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# Replace the old file in te RAM filesystem.
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mv ${CONFIG_DIR}/${fname}.new ${CONFIG_DIR}/${fname}
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done
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umount $CONFIG_MOUNTPOINT
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sync
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}
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