Gmer4Lfe
e0cf83c944
The pull substituted only HOSTN_, so bare HOSTN in comments kept tripping conf_upgrade's own guard and no host conf had upgraded since the guard landed.
440 lines
23 KiB
Bash
Executable File
440 lines
23 KiB
Bash
Executable File
#!/bin/bash
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# ==============================================================================================
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# ============================= conf_upgrade.sh ================================================
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# ==============================================================================================
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#
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# PURPOSE
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# ─────────────────────────────────────────────────────────────────────────────
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# Merges a new conf template into an existing user conf while preserving every
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# value the user has already set. Run manually when the conf schema changes
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# between versions — adds new keys, removes deprecated ones, and keeps the
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# structure of the new template exactly.
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#
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# Keys in template only → ADDED (placeholder/default — user fills in once)
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# Keys in target only → REMOVED (deprecated in new version)
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# Keys in both → KEPT (target's value always wins, template ignored)
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# Comments / blank lines → always from template (structure follows new version)
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#
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# Supports all conf variable patterns: simple scalars, indexed arrays, and
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# associative arrays (declare -A).
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#
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# ==============================================================================================
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# OPERATIONAL MODEL
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# ==============================================================================================
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#
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# 1. Validate both --template and --target exist
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# 2. Parse each into keys, handling scalars, indexed arrays and declare -A
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# 3. Classify every key: ADDED (template only) / REMOVED (target only) / KEPT (both)
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# 4. Emit the merged result — template structure, target values — to a temp file
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# staged in the target's own directory
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# 5. --dry-run stops here and prints the report
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# 6. --backup copies the current target to .bak
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# 7. Install by atomic rename over the target
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#
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# Called automatically by git_pull_execute.sh after every pull, for master.conf and this
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# host's own host*.conf. The host template is HOSTN_-prefixed and the caller substitutes
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# the real MY_ID before merging.
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#
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# ==============================================================================================
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# DESIGN PRINCIPLES
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# ==============================================================================================
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#
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# The User's Value Always Wins
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# For any key present in both files, the target's value is kept and the template's is
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# discarded. The template supplies structure and new keys, never settings. This is what
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# makes the upgrade safe to run unattended after every single pull.
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#
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# Structure Follows the Template
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# Comments, ordering and blank lines come from the template, so an upgraded conf reads
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# like the current version rather than accumulating layers of old formatting.
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#
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# Standalone by Design — Do Not Add load_config.sh
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# This script sources nothing. It is the tool that repairs the conf that load_config.sh
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# depends on, so it has to work when that conf is broken, partial, or missing keys.
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# Sourcing load_config.sh here would make the repair tool fail in exactly the situation
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# it exists for. That is also why it uses plain echo instead of log()/error(), and why
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# there is no acquire_lock — common.sh is not available to it.
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#
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# Atomic Install, Never In-Place
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# The merged conf is renamed over the target, not copied into it. Every watchdog sources
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# load_config.sh on every run; a cp would truncate master.conf and write into it, and
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# anything reading during that window gets a partial conf with empty path variables.
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#
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# Concurrency Handled by Atomicity, Not a Lock
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# Two concurrent runs against the same target cannot corrupt it — each stages its own
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# temp file and the rename is atomic, so the last writer simply wins. Since the merge is
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# idempotent, that outcome is identical to running once.
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#
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# ==============================================================================================
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# OPERATIONAL SAFEGUARDS
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# ==============================================================================================
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#
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# The Host Slot Must Be Declared, Never Inferred
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# host.conf.template ships HOSTN_ placeholders; a live host conf uses HOST1_ / HOST2_. Key
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# matching is literal, so merging the raw template against a real host conf classifies every
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# existing key as deprecated — KEPT 0 — and the install drops every credential in the file.
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# Verified on HOST1 2026-08-02: it would have removed HOST1_RADARR_API_KEY,
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# HOST1_EMBY_API_KEY, HOST1_NPM_PASS and 137 others.
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#
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# --host-slot HOST<n> is how a caller says which slot the template is being resolved for, and
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# it works for any slot — HOST1, HOST2, and whatever a third server would be. The slot is
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# still never inferred from the target and applied silently: the caller declares it, and the
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# target is read only to contradict a wrong answer. A declared slot that disagrees with the
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# target's own keys aborts, because substituting for the wrong slot destroys the file just as
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# thoroughly as not substituting at all. Without the flag, a template containing HOSTN is
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# refused exactly as before.
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#
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# Both cases are substituted. HOSTN_ covers the key prefixes, bare HOSTN appears in section
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# comments, and lowercase hostn is a real value — the hostn-appdata rsync profile keys. A
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# substitution handling only HOSTN_ leaves a conf carrying a profile named hostn-appdata that
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# nothing references.
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#
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# A Target Owning Two Slots Is Refused
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# A host conf describes exactly one server. Finding both HOST1_ and HOST2_ key definitions in
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# one target means it is not the file it claims to be, so the slot cross-check has nothing
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# trustworthy to compare against and the run aborts rather than picking one.
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#
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# Total Mismatch Is Refused
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# Keeping nothing from a populated conf is never a real upgrade; it means the two files do
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# not describe the same thing. KEPT 0 with a non-empty REMOVED list aborts. This is the
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# general net behind the HOSTN check — the failure mode is silent and total, so it fires in
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# --dry-run as well, putting the warning in the report itself.
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#
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# Root Required to Write
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# Installing over the target requires root. --dry-run deliberately does not, so the
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# change report can be previewed by anyone.
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#
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# Atomic Rename
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# The temp file is created in the target's own directory so the rename stays within one
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# filesystem. On Unraid /tmp is rootfs while the confs live on flash, and a cross-device
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# mv degrades to copy-then-unlink — precisely the torn write this avoids.
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#
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# Permissions Preserved
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# mktemp creates 0600; the target's existing mode and owner are copied onto the temp file
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# before it is installed, so a conf does not come back with different permissions.
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#
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# Temp File Cleanup
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# An EXIT trap removes the staged file on any early exit, and is cleared once the rename
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# has succeeded so the trap cannot delete the installed conf.
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#
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# Dry-run Mode
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# --dry-run prints the full change report (ADDED / REMOVED / KEPT) then exits
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# without writing anything. Always preview before applying to production confs.
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#
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# Backup Option
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# --backup writes a .bak copy of the target before overwriting. Use when
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# applying to a conf that has never been upgraded before.
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#
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# File Existence Guards
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# Both --template and --target are validated before any parsing begins.
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# Missing files abort immediately with a clear error.
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#
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# ==============================================================================================
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# CONFIGURATION
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# ==============================================================================================
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#
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# No conf vars. All inputs are CLI flags.
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#
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# --template <file> New version conf file (source of structure and defaults)
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# --target <file> Existing user conf (source of real values — always preserved)
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# --host-slot <HOSTn> Resolve HOSTN/hostn placeholders to this slot before merging.
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# Required for host.conf.template; meaningless for master.conf.template,
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# which has no placeholders. Must match the target's own slot.
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# --dry-run Show what would change without writing
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# --backup Write a .bak copy of target before modifying
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#
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# ==============================================================================================
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# RUNTIME MODES
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# ==============================================================================================
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#
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# conf_upgrade.sh --template Deployment/master.conf.template --target Configurations/master.conf --dry-run
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# Preview what would be added, removed, and kept — no changes written.
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#
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# conf_upgrade.sh --template Deployment/master.conf.template --target Configurations/master.conf --backup
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# Apply the upgrade, writing a .bak first.
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#
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# conf_upgrade.sh --template Deployment/master.conf.template --target Configurations/master.conf
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# Apply the upgrade in-place with no backup.
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#
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# conf_upgrade.sh --template Deployment/host.conf.template --target Configurations/host1.conf \
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# --host-slot HOST1 --dry-run
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# Preview a host conf upgrade. HOSTN/hostn are resolved to HOST1/host1 first. Swap in HOST2
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# and host2.conf for the other server — the template is the same file for every slot.
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#
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# ==============================================================================================
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set -uo pipefail
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# ── Arguments ────────────────────────────────────────────────────────────────────────────────
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TEMPLATE=""
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TARGET=""
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DRY_RUN=false
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BACKUP=false
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HOST_SLOT=""
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_RESOLVED_TMPL="" # set only when --host-slot triggers a substitution; cleaned on exit
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while [[ $# -gt 0 ]]; do
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case "$1" in
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--template) TEMPLATE="$2"; shift 2 ;;
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--target) TARGET="$2"; shift 2 ;;
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--host-slot) HOST_SLOT="$2"; shift 2 ;;
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--dry-run) DRY_RUN=true; shift ;;
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--backup) BACKUP=true; shift ;;
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*) echo "Unknown option: $1" >&2; exit 1 ;;
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esac
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done
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[[ -z "$TEMPLATE" ]] && { echo "Error: --template required" >&2; exit 1; }
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[[ -z "$TARGET" ]] && { echo "Error: --target required" >&2; exit 1; }
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[[ -f "$TEMPLATE" ]] || { echo "Error: template not found: $TEMPLATE" >&2; exit 1; }
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[[ -f "$TARGET" ]] || { echo "Error: target not found: $TARGET" >&2; exit 1; }
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# ── Host slot resolution ─────────────────────────────────────────────────────────────────────
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#
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# host.conf.template ships HOSTN_ placeholders; a live host conf uses HOST1_ / HOST2_. Key
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# matching below is literal, so merging the raw template against a real host conf classifies
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# EVERY existing key as deprecated and every template key as new — KEPT 0, and the install
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# would drop every credential in the file.
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#
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# --host-slot is how a caller declares which slot the template is for. The slot is never
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# inferred from the target and silently applied: the caller states it, and the target is used
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# only to contradict a wrong answer. Substituting for the wrong slot is the same catastrophe as
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# not substituting at all, so a declared slot that disagrees with the target is refused.
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#
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# Both cases matter. HOSTN_ covers the 159 key prefixes; bare HOSTN appears in section comments,
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# and lowercase hostn is a real value — the hostn-appdata rsync profile keys. A substitution
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# that only handles HOSTN_ leaves a live conf with a profile named hostn-appdata that nothing
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# references, which is what the pull script did before this flag existed.
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_target_slots=$(grep -oE '^[[:space:]]*HOST[0-9]+_' "$TARGET" 2>/dev/null \
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| grep -oE 'HOST[0-9]+' | sort -u)
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_target_slot=$(echo "$_target_slots" | head -1)
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if [[ $(echo "$_target_slots" | grep -c .) -gt 1 ]]; then
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echo "Error: '$TARGET' defines keys for more than one host slot:" >&2
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echo " $(echo "$_target_slots" | tr '\n' ' ')" >&2
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echo " A host conf owns exactly one slot. Refusing rather than picking one." >&2
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exit 1
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fi
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if [[ -n "$HOST_SLOT" ]]; then
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if ! [[ "$HOST_SLOT" =~ ^HOST[0-9]+$ ]]; then
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echo "Error: --host-slot must be HOST<n> (e.g. HOST1, HOST2) — got '$HOST_SLOT'" >&2
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exit 1
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fi
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if [[ -n "$_target_slot" && "$_target_slot" != "$HOST_SLOT" ]]; then
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echo "Error: --host-slot says $HOST_SLOT but '$TARGET' defines ${_target_slot}_ keys." >&2
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echo " Substituting for the wrong slot removes every key the target actually has," >&2
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echo " credentials included. Refusing." >&2
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exit 1
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fi
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if grep -q -e 'HOSTN' -e 'hostn' "$TEMPLATE" 2>/dev/null; then
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_lower=$(echo "$HOST_SLOT" | tr '[:upper:]' '[:lower:]')
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_RESOLVED_TMPL="$(mktemp)"
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trap '[[ -n "${_RESOLVED_TMPL:-}" ]] && rm -f "$_RESOLVED_TMPL"' EXIT
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sed -e "s/HOSTN/${HOST_SLOT}/g" -e "s/hostn/${_lower}/g" "$TEMPLATE" > "$_RESOLVED_TMPL"
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TEMPLATE="$_RESOLVED_TMPL"
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echo " Resolved HOSTN → ${HOST_SLOT} for this host"
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fi
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elif grep -q 'HOSTN' "$TEMPLATE" 2>/dev/null; then
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# No slot declared and the template is still generic — the original refusal, unchanged.
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if [[ -n "$_target_slot" ]]; then
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_lower=$(echo "$_target_slot" | tr '[:upper:]' '[:lower:]')
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echo "Error: template still contains HOSTN placeholders, but the target uses ${_target_slot}_." >&2
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echo " Merging as-is would classify all ${_target_slot}_ keys as deprecated and remove" >&2
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echo " them — including every credential. Declare the slot:" >&2
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echo "" >&2
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echo " $0 --template $TEMPLATE --target $TARGET --host-slot ${_target_slot} --dry-run" >&2
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echo "" >&2
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exit 1
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fi
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fi
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# ── Parse target → KEY → full definition block ───────────────────────────────────────────────
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declare -A HOST_MAP # KEY → complete definition line(s) from user's conf
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_parse_target() {
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local in_block=false cur_key="" cur_block="" line
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while IFS= read -r line || [[ -n "$line" ]]; do
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if [[ "$in_block" == true ]]; then
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cur_block+="$line"$'\n'
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# Closing ) — optional trailing whitespace and comment
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if [[ "$line" =~ ^[[:space:]]*\)[[:space:]]*(#.*)?$ ]]; then
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HOST_MAP["$cur_key"]="$cur_block"
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in_block=false; cur_key=""; cur_block=""
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fi
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else
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# declare -A KEY=(
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if [[ "$line" =~ ^[[:space:]]*declare[[:space:]]+-[a-zA-Z]+[[:space:]]+([A-Z0-9_]+)[[:space:]]*=\( ]]; then
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cur_key="${BASH_REMATCH[1]}"; in_block=true; cur_block="$line"$'\n'
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# KEY=(
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elif [[ "$line" =~ ^[[:space:]]*([A-Z0-9_]+)[[:space:]]*=\( ]]; then
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cur_key="${BASH_REMATCH[1]}"; in_block=true; cur_block="$line"$'\n'
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# KEY=value (simple scalar)
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elif [[ "$line" =~ ^[[:space:]]*([A-Z0-9_]+)[[:space:]]*= ]]; then
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HOST_MAP["${BASH_REMATCH[1]}"]="$line"$'\n'
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fi
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fi
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done < "$TARGET"
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}
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# ── Walk template — collect stats (must run in current shell so arrays persist) ──────────────
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declare -a ADDED=() KEPT=() REMOVED=()
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declare -A TMPL_SEEN=()
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_collect_stats() {
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local in_block=false cur_key="" line
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while IFS= read -r line || [[ -n "$line" ]]; do
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if [[ "$in_block" == true ]]; then
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if [[ "$line" =~ ^[[:space:]]*\)[[:space:]]*(#.*)?$ ]]; then
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in_block=false
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TMPL_SEEN["$cur_key"]=1
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if [[ -n "${HOST_MAP[$cur_key]+_}" ]]; then KEPT+=("$cur_key")
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else ADDED+=("$cur_key"); fi
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cur_key=""
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fi
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else
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if [[ "$line" =~ ^[[:space:]]*declare[[:space:]]+-[a-zA-Z]+[[:space:]]+([A-Z0-9_]+)[[:space:]]*=\( ]]; then
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cur_key="${BASH_REMATCH[1]}"; in_block=true
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elif [[ "$line" =~ ^[[:space:]]*([A-Z0-9_]+)[[:space:]]*=\( ]]; then
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cur_key="${BASH_REMATCH[1]}"; in_block=true
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elif [[ "$line" =~ ^[[:space:]]*([A-Z0-9_]+)[[:space:]]*= ]]; then
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local k="${BASH_REMATCH[1]}"
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TMPL_SEEN["$k"]=1
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if [[ -n "${HOST_MAP[$k]+_}" ]]; then KEPT+=("$k")
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else ADDED+=("$k"); fi
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fi
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fi
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done < "$TEMPLATE"
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for key in "${!HOST_MAP[@]}"; do
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[[ -z "${TMPL_SEEN[$key]+_}" ]] && REMOVED+=("$key")
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done
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}
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# ── Walk template — write merged output ──────────────────────────────────────────────────────
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# Runs in a subshell (stdout redirected) — array mutations are intentionally discarded here.
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_write_merged() {
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local in_block=false cur_key="" cur_block="" line
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while IFS= read -r line || [[ -n "$line" ]]; do
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if [[ "$in_block" == true ]]; then
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cur_block+="$line"$'\n'
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if [[ "$line" =~ ^[[:space:]]*\)[[:space:]]*(#.*)?$ ]]; then
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in_block=false
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if [[ -n "${HOST_MAP[$cur_key]+_}" ]]; then printf '%s' "${HOST_MAP[$cur_key]}"
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else printf '%s' "$cur_block"; fi
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cur_key=""; cur_block=""
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fi
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else
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if [[ "$line" =~ ^[[:space:]]*declare[[:space:]]+-[a-zA-Z]+[[:space:]]+([A-Z0-9_]+)[[:space:]]*=\( ]]; then
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cur_key="${BASH_REMATCH[1]}"; in_block=true; cur_block="$line"$'\n'
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elif [[ "$line" =~ ^[[:space:]]*([A-Z0-9_]+)[[:space:]]*=\( ]]; then
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cur_key="${BASH_REMATCH[1]}"; in_block=true; cur_block="$line"$'\n'
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elif [[ "$line" =~ ^[[:space:]]*([A-Z0-9_]+)[[:space:]]*= ]]; then
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local k="${BASH_REMATCH[1]}"
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if [[ -n "${HOST_MAP[$k]+_}" ]]; then printf '%s' "${HOST_MAP[$k]}"
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else printf '%s\n' "$line"; fi
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else
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printf '%s\n' "$line"
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fi
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fi
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done < "$TEMPLATE"
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}
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# ── Run ───────────────────────────────────────────────────────────────────────────────────────
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_parse_target
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_collect_stats
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# ── Report ────────────────────────────────────────────────────────────────────────────────────
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TARGET_NAME="$(basename "$TARGET")"
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echo ""
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echo "── conf_upgrade: $TARGET_NAME ──────────────────────────────────────────"
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if [[ ${#ADDED[@]} -gt 0 ]]; then
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echo " ADDED (new — fill in your values where needed):"
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for k in "${ADDED[@]}"; do echo " + $k"; done
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fi
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if [[ ${#REMOVED[@]} -gt 0 ]]; then
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echo " REMOVED (deprecated — no longer in this version):"
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for k in "${REMOVED[@]}"; do echo " - $k"; done
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fi
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echo " KEPT ${#KEPT[@]} existing vars — your values preserved"
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# ── Guard: total mismatch ────────────────────────────────────────────────────────────────────
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#
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# Keeping nothing from a populated conf is never a real upgrade — it is the signature of the
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# two files not describing the same thing (wrong template, wrong target, unsubstituted
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# placeholders). The HOSTN check above catches the known cause; this catches the rest, because
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# the failure mode is silent and total: every value in the file is replaced by a default.
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# Deliberately fires in --dry-run too, so the report itself carries the warning.
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if [[ ${#KEPT[@]} -eq 0 && ${#REMOVED[@]} -gt 0 ]]; then
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echo "────────────────────────────────────────────────────────────────────────"
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echo ""
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echo "Error: refusing — this would keep NOTHING and remove all ${#REMOVED[@]} existing keys." >&2
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echo " A genuine upgrade preserves values; keeping zero means the template and the" >&2
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echo " target do not describe the same conf. Check that --template matches --target" >&2
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echo " and that any HOSTN placeholders were substituted for this host's slot." >&2
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echo "" >&2
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exit 1
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fi
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if [[ ${#ADDED[@]} -eq 0 && ${#REMOVED[@]} -eq 0 ]]; then
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echo " Already up to date — no changes needed."
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echo "────────────────────────────────────────────────────────────────────────"
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echo ""
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exit 0
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fi
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echo "────────────────────────────────────────────────────────────────────────"
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echo ""
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# ── Apply ─────────────────────────────────────────────────────────────────────────────────────
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if [[ "$DRY_RUN" == true ]]; then
|
|
echo "(dry-run — no changes written)"
|
|
exit 0
|
|
fi
|
|
|
|
# Checked here rather than at the top: --dry-run is a read-only report and is useful to
|
|
# anyone, but installing over a conf under /boot needs root. Plain echo because this script
|
|
# deliberately does not source common.sh — see the header.
|
|
if [[ "$EUID" -ne 0 ]]; then
|
|
echo "ERROR: writing '$TARGET' requires root (use --dry-run to preview as any user)" >&2
|
|
exit 1
|
|
fi
|
|
|
|
# Staged beside the target, not in /tmp. mv is only atomic within one filesystem, and on
|
|
# Unraid /tmp is rootfs while the confs live on flash — a cross-device mv silently degrades
|
|
# to copy-then-unlink, which is exactly the torn write this is meant to prevent.
|
|
TMPOUT="$(mktemp "${TARGET}.XXXXXX")"
|
|
trap 'rm -f "$TMPOUT"; [[ -n "${_RESOLVED_TMPL:-}" ]] && rm -f "$_RESOLVED_TMPL"' EXIT
|
|
|
|
# mktemp creates 0600; carry the target's existing mode/owner across so the installed conf
|
|
# does not come back with different permissions than it went in with.
|
|
chmod --reference="$TARGET" "$TMPOUT" 2>/dev/null || true
|
|
chown --reference="$TARGET" "$TMPOUT" 2>/dev/null || true
|
|
|
|
_write_merged > "$TMPOUT"
|
|
|
|
if [[ "$BACKUP" == true ]]; then
|
|
cp -a "$TARGET" "${TARGET}.bak"
|
|
echo "Backup: ${TARGET}.bak"
|
|
fi
|
|
|
|
# Atomic install. cp would truncate the live conf and write into it, leaving a window where
|
|
# anything sourcing load_config.sh reads a half-written master.conf — every watchdog does
|
|
# that constantly. A rename swaps the inode: readers get the old file or the new one.
|
|
mv -f "$TMPOUT" "$TARGET"
|
|
trap - EXIT
|
|
[[ -n "$_RESOLVED_TMPL" ]] && rm -f "$_RESOLVED_TMPL"
|
|
echo "Updated: $TARGET"
|