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cli/payload: Allow unpacking only metadata from delta payloads

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The images are the only parts that can't be extracted. Having the
unpacked metadata is useful because it allows for manually building a
full payload using the metadata from the delta payload.

Discussion: #582

Signed-off-by: Andrew Gunnerson <accounts+github@chiller3.com>
This commit is contained in:
Andrew Gunnerson
2026-03-25 18:37:24 -04:00
parent e8532870b1
commit c1836d01a4
1 changed files with 8 additions and 7 deletions
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avbroot/src/cli/payload.rs
+8 -7
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@@ -22,15 +22,12 @@ use crate::{
util,
};
fn open_reader(path: &Path, allow_delta: bool) -> Result<(BufReader<File>, PayloadHeader)> {
fn open_reader(path: &Path) -> Result<(BufReader<File>, PayloadHeader)> {
let mut reader = File::open(path)
.map(BufReader::new)
.with_context(|| format!("Failed to open payload for reading: {path:?}"))?;
let header = PayloadHeader::from_reader(&mut reader)
.with_context(|| format!("Failed to read payload header: {path:?}"))?;
if !allow_delta && !header.is_full_ota() {
bail!("Payload is a delta OTA, not a full OTA");
}
Ok((reader, header))
}
@@ -104,7 +101,7 @@ fn unpack_subcommand(
cli: &UnpackCli,
cancel_signal: &AtomicBool,
) -> Result<()> {
let (mut reader, header) = open_reader(&cli.input, false)?;
let (mut reader, header) = open_reader(&cli.input)?;
let payload_size = reader
.seek(SeekFrom::End(0))
.with_context(|| format!("Failed to get file size: {:?}", cli.input))?;
@@ -114,6 +111,10 @@ fn unpack_subcommand(
write_info(&cli.output_info, &header)?;
if !cli.no_output_images {
if !header.is_full_ota() {
bail!("Cannot extract images from a delta payload");
}
fs::create_dir_all(&cli.output_images)
.with_context(|| format!("Failed to create directory: {:?}", cli.output_images))?;
@@ -260,7 +261,7 @@ fn repack_subcommand(
) -> Result<()> {
let signing_key = load_key(&cli.key)?;
let (mut reader, header) = open_reader(&cli.input, true)?;
let (mut reader, header) = open_reader(&cli.input)?;
info!("Generating new OTA payload");
@@ -316,7 +317,7 @@ fn repack_subcommand(
}
fn info_subcommand(payload_cli: &PayloadCli, cli: &InfoCli) -> Result<()> {
let (_, header) = open_reader(&cli.input, true)?;
let (_, header) = open_reader(&cli.input)?;
display_header(payload_cli, &header);