- /data/gsi/ota/* now has the type ota_image_data_file. At runtime
during an OTA, update_engine uses libsnapshot to talk to gsid
to create these images as a backing storage of snapshots. These
"COW images" stores the changes update_engine has applied to
the partitions.
If the update is successful, these changes will be merged to the
partitions, and these images will be teared down. If the update
fails, these images will be deleted after rolling back to the
previous slot.
- /metadata/gsi/ota/* now has the type ota_metadata_file. At runtime
during an OTA, update_engine and gsid stores update states and
information of the created snapshots there. At next boot, init
reads these files to re-create the snapshots.
Beside these assignments, this CL also allows gsid and update_engine
to have the these permissions to do these operations.
Bug: 135752105
Test: apply OTA, no failure
Change-Id: Ibd53cacb6b4ee569c33cffbc18b1b801b62265de
gsid creates loop devices when it cannot use device-mapper. This can
occur when images are split into multiple files (for example, FAT32) or
when a device is unencrypted, or FBE without metadata encryption. In
addition to accessing /dev/loop-control and loop devices, it also needs
LOOP_SET_DIRECT_IO and LOOP_SET_BLOCK_SIZE to optimize writes.
Bug: 134536978
Test: gsi_tool install works on crosshatch with metadata encryption
disabled
Change-Id: I3f0aee1d0757e4b299deee74a8c1077846d56292
This is needed now that libfiemap_writer reads from dm/name to find
device-mapper names.
Bug: 134536978
Test: gsi_tool install
Change-Id: I10e1234f2ea39c92b43ace97fa76878358dfc476
To install GSIs on external storage (such as sdcards), gsid needs some
additional privileges:
- proc_cmdline and device-tree access to call ReadDefaultFstab().
This is ultimately used to check whether system's dm-verity has
check_at_most_once enabled, which is disallowed with sdcards.
- vfat read/write access to write files to the sdcard. Note that
adopted sdcards are not supported here.
- read access to the sdcard block device. To enable this without
providing access to vold_block_device, a new sdcard_block_device
label was added. Devices must apply this label appropriately to
enable gsid access.
- FIBMAP access for VFAT filesystems, as they do not support FIEMAP.
This only appears to work by granting SYS_RAWIO.
Bug: 126230649
Test: adb shell su root gsi_tool install --install_dir=/mnt/media_rw/...
works without setenforce 0
Change-Id: I88d8d83e5f61d4c0490f912f226fe1fe38cd60ab
