blockdev: Use -b for lsblk, hard require size property

I noticed that the JSON format inconsistently uses human-readable
sizes for some properties, but not others. `size` happens to
be one of the ones were it outputs human readable. But I think
we will often want to operate on the raw byte value on our
own, so let's tell lsblk to just give us raw numbers and
do formatting where needed.

While we're here, just hard require the `size` property.
I don't think any block devices can be missing this.

Signed-off-by: Colin Walters <[email protected]>

lib/src/blockdev.rs

@@ -29,7 +29,7 @@ pub(crate) struct Device {
     pub(crate) model: Option<String>,
     pub(crate) partlabel: Option<String>,
     pub(crate) children: Option<Vec<Device>>,
-    pub(crate) size: Option<String>,
+    pub(crate) size: u64,
     #[serde(rename = "maj:min")]
     pub(crate) maj_min: Option<String>,
     // NOTE this one is not available on older util-linux
@@ -91,7 +91,7 @@ pub(crate) fn wipefs(dev: &Utf8Path) -> Result<()> {
 
 fn list_impl(dev: Option<&Utf8Path>) -> Result<Vec<Device>> {
     let o = Command::new("lsblk")
-        .args(["-J", "-O"])
+        .args(["-J", "-b", "-O"])
         .args(dev)
         .output()?;
     if !o.status.success() {

lib/src/install/baseline.rs

@@ -125,7 +125,7 @@ fn mkfs<'a>(
     opts: impl IntoIterator<Item = &'a str>,
 ) -> Result<uuid::Uuid> {
     let devinfo = crate::blockdev::list_dev(dev.into())?;
-    let size = devinfo.size.as_deref().unwrap_or("(unknown)");
+    let size = ostree_ext::glib::format_size(devinfo.size);
     let u = uuid::Uuid::new_v4();
     let mut t = Task::new(
         &format!("Creating {label} filesystem ({fs}) on device {dev} (size={size})"),
@@ -210,12 +210,8 @@ pub(crate) fn install_create_rootfs(
     };
     let serial = device.serial.as_deref().unwrap_or("<unknown>");
     let model = device.model.as_deref().unwrap_or("<unknown>");
-    let size = device
-        .size
-        .as_deref()
-        .ok_or_else(|| anyhow::anyhow!("Missing size for blockdev"))?;
     println!("Block setup: {block_setup}");
-    println!("       Size: {size}",);
+    println!("       Size: {}", device.size);
     println!("     Serial: {serial}");
     println!("      Model: {model}");