34faed5bb0
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() {
|
|
local path="$1"
|
|
|
|
# Get the last modification time of all regular files, sort them,
|
|
# and get the most recent. Maybe we should use
|
|
# https://github.com/0-wiz-0/findnewest here.
|
|
local -a res=($(find "$path" -type f -not -newer "$NIX_BUILD_TOP/.." -printf '%T@ %p\0' \
|
|
| sort -n --zero-terminated | tail -n1 --zero-terminated | head -c -1))
|
|
local time="${res[0]//\.[0-9]*/}" # remove the fraction part
|
|
local newestFile="${res[1]}"
|
|
|
|
# Update $SOURCE_DATE_EPOCH if the most recent file we found is newer.
|
|
if [ "${time:-0}" -gt "$SOURCE_DATE_EPOCH" ]; then
|
|
echo "setting SOURCE_DATE_EPOCH to timestamp $time of file $newestFile"
|
|
export SOURCE_DATE_EPOCH="$time"
|
|
|
|
# Warn if the new timestamp is too close to the present. This
|
|
# may indicate that we were being applied to a file generated
|
|
# during the build, or that an unpacker didn't restore
|
|
# timestamps properly.
|
|
local now="$(date +%s)"
|
|
if [ "$time" -gt $((now - 60)) ]; then
|
|
echo "warning: file $newestFile may be generated; SOURCE_DATE_EPOCH may be non-deterministic"
|
|
fi
|
|
fi
|
|
}
|
|
|
|
postUnpackHooks+=(_updateSourceDateEpochFromSourceRoot)
|
|
|
|
_updateSourceDateEpochFromSourceRoot() {
|
|
if [ -n "$sourceRoot" ]; then
|
|
updateSourceDateEpoch "$sourceRoot"
|
|
fi
|
|
}
|