21 lines
806 B
Bash
21 lines
806 B
Bash
#!/bin/sh
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#
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# Create a systemd environment file for tee-supplicant
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# $1 is the path to the file to be generated.
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# At the moment this figures out the --rpmb-cid parameter to be given to
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# tee-supplicant, indicating which eMMC device OP-TEE should use for RPMB
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# storage.
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# No file is generated if no device is found (not an error) or if multiple
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# eMMCs are found (which is an error).
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[ "$1" ] || { echo Usage: $0 FILE >&2; exit 1; }
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for f in /sys/class/mmc_host/mmc*/mmc*\:*/raw_rpmb_size_mult; do
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[ "$CID" ] && { echo $0: Multiple eMMC devices found, not chosing one automatically >&2; exit 2; }
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# POSIX shells don't expand globbing patterns that match no file
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[ -e $f ] || exit 0
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SYS_MMC_PATH=$(dirname $f)
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CID=$(cat $SYS_MMC_PATH/cid)
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done
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[ "$CID" ] && echo RPMB_CID="--rpmb-cid $CID" >$1
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