Jorijn van der Graaf
40ccc12a18
ssh ControlMaster keeps one authenticated connection (login typed at most once, or never with sshpass installed); sudo answers itself via a SUDO_ASKPASS helper carrying the image's public default password (sudo -S would have eaten the boot image's first bytes from stdin). Helper lives on tmpfs and evaporates with the install reboot. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
118 lines
4.8 KiB
Shell
Executable file
118 lines
4.8 KiB
Shell
Executable file
#!/bin/sh -eu
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# fp6-img modem-preserving installer for the Fairphone 6.
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#
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# Why this exists: this device's bootloader ZEROES the modem's NV storage
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# (modemst1/modemst2) whenever the boot partition is written over fastboot —
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# after a classic `fastboot flash boot`, cellular (incl. eSIM access) is dead
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# until restored. Isolated by experiment, 2026-08-09 (fp6 journal/modem).
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#
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# This installer never lets the bootloader write boot:
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# 1. fastboot erase dtbo (verified safe)
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# 2. fastboot flash userdata (rootfs; not a boot write - believed safe,
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# final isolation pending; step 5 verifies)
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# 3. fastboot boot boot.img (RAM boot - writes nothing; verified safe)
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# 4. dd boot.img to boot_a from the booted Linux over USB networking
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# (kernel block layer - the bootloader never sees it)
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# 5. read back the modem NV and tell you the truth either way
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#
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# Requirements on this machine: fastboot, ssh. Phone: bootloader unlocked,
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# in fastboot mode (Vol-down + Power), connected over USB.
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# Run from a directory containing boot.img and fairphone-fp6.img.
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PHONE=172.16.42.1
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BOOT=${BOOT:-boot.img}
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ROOTFS=${ROOTFS:-fairphone-fp6.img}
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say() { printf '\n== %s ==\n' "$*"; }
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die() { printf 'ERROR: %s\n' "$*" >&2; exit 1; }
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# --- preflight ---------------------------------------------------------------
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command -v fastboot >/dev/null || die "fastboot not found (install android-tools)"
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command -v ssh >/dev/null || die "ssh not found"
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[ -f "$BOOT" ] || die "$BOOT not found (download it from the release)"
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[ -f "$ROOTFS" ] || die "$ROOTFS not found (download it from the release)"
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fastboot devices 2>/dev/null | grep -q fastboot || \
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die "no device in fastboot mode (Vol-down + Power, USB connected)"
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cat <<'EOF'
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This will REPLACE the operating system on the connected Fairphone 6
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(userdata + boot). The modem's NV storage is preserved - that is the point
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of this installer. Press Enter to continue, Ctrl-C to abort.
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EOF
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read -r _
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# --- 1+2: safe fastboot writes -------------------------------------------------
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say "erasing dtbo (one-time; safe - does not touch modem NV)"
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fastboot erase dtbo
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say "flashing rootfs to userdata (this is the big one, be patient)"
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fastboot flash userdata "$ROOTFS"
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# --- 3: RAM-boot the kernel, no write -----------------------------------------
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say "RAM-booting the new system (nothing is written)"
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fastboot boot "$BOOT"
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say "waiting for the phone to come up on the USB network ($PHONE)"
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i=0
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until (exec 3<>"/dev/tcp/$PHONE/22") 2>/dev/null; do
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i=$((i+1)); [ $i -gt 40 ] && die "phone did not appear on $PHONE after 400s"
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sleep 10
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done
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exec 3<&- 3>&- 2>/dev/null || true
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sleep 8
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# --- 4: write boot from Linux ---------------------------------------------------
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# One authenticated ssh connection is opened and kept alive (ControlMaster);
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# sudo self-answers with the image's default password via an askpass helper
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# (sudo -S would eat the first bytes of the boot image from stdin).
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PW=147147
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CTL="/tmp/fp6-install-ssh-$$"
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SSHOPTS="-o StrictHostKeyChecking=accept-new -o UserKnownHostsFile=/dev/null \
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-o ControlMaster=auto -o ControlPath=$CTL -o ControlPersist=120"
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SUDO="SUDO_ASKPASS=/tmp/.fp6-install-pw sudo -A"
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if command -v sshpass >/dev/null; then
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say "connecting (default credentials, no typing needed)"
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SSHCMD="sshpass -p $PW ssh $SSHOPTS"
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else
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say "connecting - type the password ONCE (fresh image default: 147147)"
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SSHCMD="ssh $SSHOPTS"
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fi
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# shellcheck disable=SC2086
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$SSHCMD "user@$PHONE" \
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"printf '#!/bin/sh\necho $PW\n' > /tmp/.fp6-install-pw && chmod 700 /tmp/.fp6-install-pw && echo CONNECTED" \
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|| die "could not connect to the phone"
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say "writing boot.img to boot_a from inside Linux"
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# shellcheck disable=SC2086
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cat "$BOOT" | ssh $SSHOPTS "user@$PHONE" \
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"$SUDO dd of=/dev/disk/by-partlabel/boot_a bs=1M conv=fsync status=none && sync && echo BOOT-WRITTEN"
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say "verifying modem NV survived"
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# shellcheck disable=SC2086
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Z=$(ssh $SSHOPTS "user@$PHONE" \
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"$SUDO od -An -tx1 -N4096 /dev/disk/by-partlabel/modemst1 | sort -u | wc -l" 2>/dev/null || echo 0)
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if [ "$Z" -gt 2 ]; then
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echo "modem NV intact - cellular will work."
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else
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cat <<'EOF'
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WARNING: the modem NV reads empty. If this device previously ran stock
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Android, its factory copy (fsg) is still on the device but postmarketOS
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cannot restore from it yet - see the README's modem section. If you have a
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modemst backup, dd it back now.
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EOF
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fi
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say "rebooting into the installed system"
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# shellcheck disable=SC2086
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ssh $SSHOPTS "user@$PHONE" \
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"$SUDO setsid sh -c 'sleep 2; /sbin/reboot' </dev/null >/dev/null 2>&1 & sleep 5" || true
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# shellcheck disable=SC2086
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ssh $SSHOPTS -O exit "user@$PHONE" 2>/dev/null || true
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cat <<'EOF'
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DONE. The phone reboots into postmarketOS from its own boot partition.
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Log in as user / 147147 (change it!). For VoLTE, write your carrier's
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P-CSCF into /etc/imsd.env and restart imsd - see the README.
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EOF
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