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release.sh: reproducible gzip on Mac

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Make sure we use GNU gzip. Mac by default uses BSD gzip.
This commit is contained in:
Boris Nagaev 2025-09-29 22:22:58 -03:00
parent a34b46c760
commit 6d8872f995
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2 changed files with 25 additions and 3 deletions
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7
docs/release.md
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@ -58,6 +58,13 @@ other tools:
sudo apt-get install build-essential git make zip perl gpg
```
On MacOS, you will need to install GNU tar and GNU gzip, which can be done with
`brew`:
```bash
brew install gnu-tar gzip
```
Add GPG key of Alex Bosworth to verify release tag signature:
```bash
gpg --keyserver keys.openpgp.org --recv-keys DE23E73BFA8A0AD5587D2FCDE80D2F3F311FD87E

21
release.sh
View file

@ -102,13 +102,14 @@ function reproducible_tar_gzip() {
local dir=$1
local dst=$2
local tar_cmd=tar
local gzip_cmd=gzip
# MacOS has a version of BSD tar which doesn't support setting the --mtime
# flag. We need gnu-tar, or gtar for short to be installed for this script to
# work properly.
tar_version=$(tar --version)
tar_version=$(tar --version 2>&1 || true)
if [[ ! "$tar_version" =~ "GNU tar" ]]; then
if ! command -v "gtar"; then
if ! command -v "gtar" >/dev/null 2>&1; then
red "GNU tar is required but cannot be found!"
red "On MacOS please run 'brew install gnu-tar' to install gtar."
exit 1
@ -118,12 +119,26 @@ function reproducible_tar_gzip() {
tar_cmd=gtar
fi
# On MacOS, the default BSD gzip produces a different output than the GNU
# gzip on Linux. To ensure reproducible builds, we need to use GNU gzip.
gzip_version=$(gzip --version 2>&1 || true)
if [[ ! "$gzip_version" =~ "GNU" ]]; then
if ! command -v "ggzip" >/dev/null 2>&1; then
red "GNU gzip is required but cannot be found!"
red "On MacOS please run 'brew install gzip' to install ggzip."
exit 1
fi
# We have ggzip installed, use that instead.
gzip_cmd=ggzip
fi
# Pin down the timestamp time zone.
export TZ=UTC
find "${dir}" -print0 | LC_ALL=C sort -r -z | $tar_cmd \
"--mtime=${BUILD_DATE}" --no-recursion --null --mode=u+rw,go+r-w,a+X \
--owner=0 --group=0 --numeric-owner -c -T - | gzip -9n > "$dst"
--owner=0 --group=0 --numeric-owner -c -T - | $gzip_cmd -9n > "$dst"
}
# reproducible_zip creates a reproducible zip file of a directory. This