kiss-chbuild: verify checksums

FossilOrigin-Name: b6bd32ef178a37590eb44d65e8790f64a354b8dc75b99879f5822f380e1dc70a

1 files changed, 41 insertions, 8 deletions

diff --git a/contrib/kiss-chbuild b/contrib/kiss-chbuild
index 2b406d1..2caf87e 100755
--- a/contrib/kiss-chbuild
+++ b/contrib/kiss-chbuild
@@ -4,30 +4,63 @@ case "$1" in --help|-h) printf '\033[1;33m-> \033[m%s\n' "usage: ${0##*/}"; exit
 
 log() { printf '\033[31;1m->\033[m %s.\n' "$@" ;}
 
-clean() {
-    log "Destroying chroot"
-    su -c "rm -rf chroot-$pid" || clean
+die() {
+    rm -f carbs-rootfs.tar.xz carbs-rootfs.tar.xz.sum
+
+    log "$@"
+    log "Re-run 'kiss-chbuild' to try again."
+
+    exit 1
 }
 
+sh256() {
+    # There's no standard utility to generate sha256 checksums.
+    # This is a simple wrapper around sha256sum, sha256, shasum
+    # and openssl which will use whatever is available.
+    #
+    # All utilities must match 'sha256sum' output.
+    #
+    # Example: '<checksum>  <file>'
+    [ -e "$1" ] || return 0
+
+    hash=$(sha256sum "$1" ||
+           sha256 -r "$1" ||
+           openssl dgst -sha256 -r "$1" ||
+           shasum -a 256 "$1")
+
+    printf '%s  %s\n' "${hash%% *}" "$1"
+} 2>/dev/null
+
+case "$(uname -m)" in i*86) arch=i686; esac
+url="https://dl.carbslinux.org/releases/${arch:-$(uname -m)}/carbs-rootfs.tar.xz"
 pid=$$
 
 cd "${cac_dir:=$KISS_ROOT${XDG_CACHE_HOME:-$HOME/.cache}/kiss}"
 
 [ -f carbs-rootfs.tar.xz ] || {
     log "Downloading chroot tarball"
-    wget https://dl.carbslinux.org/releases/carbs-rootfs.tar.xz
+    curl -fLO "$url"
 }
 
+[ -f carbs-rootfs.tar.xz.sum ] || {
+    log "Downloading checksums"
+    curl -fLo- "${url%/*}/sha256sums.txt" |
+        grep ' carbs-rootfs.tar.xz$' > carbs-rootfs.tar.xz.sum
+}
+
+log "Verifying checksums"
+sh256 carbs-rootfs.tar.xz | diff - carbs-rootfs.tar.xz.sum ||
+    die "Checksum verification failed"
+
+
 [ -d carbs-chroot ] || {
     log "Extracting chroot"
     mkdir -p carbs-chroot
-    tar xvf carbs-rootfs.tar.xz -C carbs-chroot
+    ( cd carbs-chroot; tar xf ../carbs-rootfs.tar.xz )
 }
 
 log "Creating temporary chroot"
 cp -a carbs-chroot "chroot-$pid"
 
-trap clean EXIT INT
-
 log "Entering chroot"
-su -c "kiss-chroot chroot-$pid"
+su -c "kiss-chroot chroot-$pid; rm -rf chroot-$pid"