install: Do not create intermediate tarfile for container

Skip the creation of the `share/container.tar` file, since it's not used
anywhere. Instead, pipe our `docker/podman save` invocations to `gzip`
directly, which will compress the tarfile on the fly. This saves both
time and disk space.

install/linux/build-image.sh

@@ -3,11 +3,8 @@
 echo "Building container image"
 podman build container --platform linux/amd64 --tag dangerzone.rocks/dangerzone
 
-echo "Saving container image"
-podman save dangerzone.rocks/dangerzone -o share/container.tar
-
-echo "Compressing container image"
-gzip -f share/container.tar
+echo "Saving and compressing container image"
+podman save dangerzone.rocks/dangerzone | gzip > share/container.tar.gz
 
 echo "Looking up the image id"
 podman image ls dangerzone.rocks/dangerzone | grep "dangerzone.rocks/dangerzone" | tr -s ' ' | cut -d' ' -f3 > share/image-id.txt

install/macos/build-image.sh

@@ -3,11 +3,8 @@
 echo "Building container image"
 docker build container --platform linux/amd64 --tag dangerzone.rocks/dangerzone
 
-echo "Saving container image"
-docker save dangerzone.rocks/dangerzone -o share/container.tar
-
-echo "Compressing container image"
-gzip -f share/container.tar
+echo "Saving and compressing container image"
+docker save dangerzone.rocks/dangerzone | gzip > share/container.tar.gz
 
 echo "Looking up the image id"
 docker image ls dangerzone.rocks/dangerzone | grep "dangerzone.rocks/dangerzone" | tr -s ' ' | cut -d' ' -f3 > share/image-id.txt

install/windows/build-image.py

@@ -18,28 +18,26 @@ def main():
     )
 
     print("Saving container image")
-    subprocess.run(
+    cmd = subprocess.Popen(
         [
             "docker",
             "save",
             "dangerzone.rocks/dangerzone",
-            "-o",
-            "share/container.tar",
-        ]
+        ],
+        stdout=subprocess.PIPE,
     )
 
     print("Compressing container image")
-    chunk_size = 1024
-    with open("share/container.tar", "rb") as f:
-        with gzip.open("share/container.tar.gz", "wb") as gzip_f:
-            while True:
-                chunk = f.read(chunk_size)
-                if len(chunk) > 0:
-                    gzip_f.write(chunk)
-                else:
-                    break
+    chunk_size = 4 << 12
+    with gzip.open("share/container.tar.gz", "wb") as gzip_f:
+        while True:
+            chunk = cmd.stdout.read(chunk_size)
+            if len(chunk) > 0:
+                gzip_f.write(chunk)
+            else:
+                break
 
-    os.remove("share/container.tar")
+    cmd.wait(5)
 
     print("Looking up the image id")
     image_id = subprocess.check_output(