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FP4: Force rollback timestamp to be of the 05th of the month

Manu Sureshrequested to merge
1706-a14-FP4 into a14

Description

FP4: Force rollback timestamp to be of the 05th of the month

Screenshots

Technical details

  • Fairphone uses the rollback from the SPL, but their SPL is always for the 05th of the month.
  • /e/ OS merges the security updates from AOSP which is for 1st of the month.
  • Even if both the OS-ses are on the same SPL, /e/ OS would always be behind, which is leading to more rollback flashing failures, internally.
  • So match with FPOS by using the 5th of the month, rollback timestamp

Tests

  • Rollback timestamp is for the 5th day of the month, regardless of what day the SPL is.
❯ avbtool info_image --image vbmeta_system.img
Minimum libavb version:   1.0
Header Block:             256 bytes
Authentication Block:     320 bytes
Auxiliary Block:          2176 bytes
Public key (sha1):        cdbb77177f731920bbe0a0f94f84d9038ae0617d
Algorithm:                SHA256_RSA2048
Rollback Index:           1770249600
Flags:                    0
Rollback Index Location:  0
Release String:           'avbtool 1.3.0'
Descriptors:
Prop: com.android.build.system.os_version -> '14'
Prop: com.android.build.system.fingerprint -> 'Fairphone/FP4eea/FP4:13/TKQ1.230127.002/TP31:user/release-keys'
Prop: com.android.build.system.security_patch -> '2026-02-01'
Prop: com.android.build.system_ext.os_version -> '14'
Prop: com.android.build.system_ext.fingerprint -> 'Fairphone/FP4eea/FP4:13/TKQ1.230127.002/TP31:user/release-keys'
Prop: com.android.build.system_ext.security_patch -> '2026-02-01'
Prop: com.android.build.product.os_version -> '14'
Prop: com.android.build.product.fingerprint -> 'Fairphone/FP4eea/FP4:13/TKQ1.230127.002/TP31:user/release-keys'
Prop: com.android.build.product.security_patch -> '2026-02-01'
❯ date -d 'TZ="GMT" 2026-02-01' +%s
1769904000
❯ date -d 'TZ="GMT" 2026-02-05' +%s
1770249600

Issues

https://gitlab.e.foundation/e/devices/backlog/-/issues/1706

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