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If there was no older file than $NIX_BUILD_TOP this would result in a warning, e.g. with nix-info. ``` /nix/store/15kgcm8hnd99p7plqzx7p4lcr2jni4df-set-source-date-epoch-to-latest.sh: line 13: [: : integer expression expected ```
35 lines
1.3 KiB
Bash
35 lines
1.3 KiB
Bash
updateSourceDateEpoch() {
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local path="$1"
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# Get the last modification time of all regular files, sort them,
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# and get the most recent. Maybe we should use
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# https://github.com/0-wiz-0/findnewest here.
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local -a res=($(find "$path" -type f -not -newer "$NIX_BUILD_TOP/.." -printf '%T@ %p\0' \
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| sort -n --zero-terminated | tail -n1 --zero-terminated | head -c -1))
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local time="${res[0]//\.[0-9]*/}" # remove the fraction part
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local newestFile="${res[1]}"
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# Update $SOURCE_DATE_EPOCH if the most recent file we found is newer.
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if [ "${time:-0}" -gt "$SOURCE_DATE_EPOCH" ]; then
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echo "setting SOURCE_DATE_EPOCH to timestamp $time of file $newestFile"
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export SOURCE_DATE_EPOCH="$time"
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# Warn if the new timestamp is too close to the present. This
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# may indicate that we were being applied to a file generated
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# during the build, or that an unpacker didn't restore
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# timestamps properly.
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local now="$(date +%s)"
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if [ "$time" -gt $((now - 60)) ]; then
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echo "warning: file $newestFile may be generated; SOURCE_DATE_EPOCH may be non-deterministic"
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fi
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fi
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}
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postUnpackHooks+=(_updateSourceDateEpochFromSourceRoot)
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_updateSourceDateEpochFromSourceRoot() {
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if [ -n "$sourceRoot" ]; then
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updateSourceDateEpoch "$sourceRoot"
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fi
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}
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