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26ba9b609b
If board_detect is interrupted by cutting power on first boot, board.json might only be half-way written and the file will not be written again correctly on subsequent boots. Write to a temporary file first, then rename. Since a rename on the same file system is an atomic operation, it ensures that either /etc/board.json does not exist or that the complete file exists. Signed-off-by: Andreas Gnau <andreas.gnau@iopsys.eu> Link: https://github.com/openwrt/openwrt/pull/20831 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
23 lines
490 B
Bash
Executable File
23 lines
490 B
Bash
Executable File
#!/bin/sh
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REAL_CFG=$1
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[ -n "$REAL_CFG" ] || REAL_CFG=/etc/board.json
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if [ -d "/etc/board.d/" ] && [ ! -s "$REAL_CFG" ]; then
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# Use temp file to prevent incomplete file on power-cut, CFG is used by the sourced script to read/write the file
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CFG="$(dirname "$REAL_CFG")/.$(basename "$REAL_CFG").tmp"
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rm -f "$CFG" || exit
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for a in $(ls /etc/board.d/*); do
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[ -s "$a" ] || continue
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(. "$a")
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done
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fi
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if [ -s "$CFG" ]; then
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mv "$CFG" "$REAL_CFG" || exit
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else
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rm -f "$CFG"
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exit 1
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fi
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