void-packages/common/hooks/post-install/05-generate-gitrevs.sh

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# This hook generates a file in ${wrksrc}/.xbps_git_revs with the last
# commit sha1 (in short mode) for all files of a source pkg.
hook() {
local GITREVS_FILE=${wrksrc}/.xbps_${sourcepkg}_git_revs
local GIT_CMD rev
# If XBPS_USE_GIT_REVS is disabled in conf file don't continue.
if [ -z $XBPS_USE_GIT_REVS ]; then
return
fi
# If the file exists don't regenerate it again.
if [ -s ${GITREVS_FILE} ]; then
return
fi
if command -v chroot-git &>/dev/null; then
GIT_CMD=$(command -v chroot-git)
elif command -v git &>/dev/null; then
GIT_CMD=$(command -v git)
else
msg_error "$pkgver: cannot find chroot-git or git utility, exiting...\n"
fi
cd $XBPS_SRCPKGDIR
rev="$($GIT_CMD rev-parse --short HEAD)"
echo "${sourcepkg}:${rev}"
echo "${sourcepkg}:${rev}" > $GITREVS_FILE
}