0.37.4 (March 27, 2024)

IMPROVEMENTS:

Add a ServerErrCh to the runner that that will surface server errors back to the caller. GH-1897

BUG FIXES:

Fixed a goroutine leak where dependencies could be added after a runner stops. GH-1898

0.37.3 (Unreleased)

Version 0.37.3 includes all the changes in 0.37.4 but was not officially released.

0.37.2 (March 8, 2024)

IMPROVEMENTS:

Add ability to set custom render and reader functions to control behaviour writing and reading files. GH-1876

0.37.1 (February 26, 2024)

BUG FIXES:

Fix peer not being a part of String function in health_service.go.
Fix flaky ENT test cases NET-7377.

0.37.0 (February 20, 2024)

NEW FEATURES:

Add support for listing Consul peers NET-6966
Add ENT test cases such that all unit tests could run on different combinations of namespace and partition NET-7377

BUG FIXES:

Fetch services query not overriding opts correctly NET-7571
All consul resources which support namespace and partition should also have namespace and partition in the key represented by String function.NET-7571
Consul-template now correctly renders KVv2 secrets with delete_version_after set NET-3777

v0.36.0 (January 3, 2024)

IMPROVEMENTS:

Support for namespaces, partitions in consul endpoints. GH-1842
Bump github.com/go-jose/go-jose/v3 from 3.0.0 to 3.0.1. GH-1843
Bump golang.org/x/crypto from 0.14.0 to 0.17.0. GH-1858
Add Vault transport configuration option for MaxConnsPerHost. GH-1858

v0.35.0 (November 7, 2023)

NEW FEATURES:

Add alpha support for Consul namespaces/partitions/peering. GH-1822

IMPROVEMENTS:

Bump golang.org/x/text from 0.13.0 to 0.14.0. GH-1830
Bump golang.org/x/sys from 0.13.0 to 0.14.0. GH-1829
Bump github.com/hashicorp/consul/sdk from 0.14.1 to 0.15.0. GH-1826
Bump github.com/hashicorp/consul/api from 1.25.1 to 1.26.1. GH-1827

v0.34.0 (October 11, 2023)

IMPROVEMENTS:

Refactor deprecated Vault calls. GH-1768
Remove explicit math/rand seed. GH-1793
Bump github.com/hashicorp/vault/api/auth/kubernetes from 0.4.1 to 0.5.0. GH-1805
Bump go version from 1.20 to 1.21. GH-1819
Bump golang.org/x/text from 0.11.0 to 0.13.0. GH-1802
Bump golang.org/x/sys from 0.11.0 to 0.13.0. GH-1816
Bump github.com/hashicorp/consul/api from 1.23.0 to 1.25.1. GH-1787 GH-1815
Bump github.com/hashicorp/vault/api from 1.9.2 to 1.10.0. GH-1806
Bump golangci/golangci-lint-action from 3.6.0 to 3.7.0. GH-1812
add golangci-lint. GH-1773 GH-1774

v0.33.0 (August 9, 2023)

IMPROVEMENTS:

Add support for setting Vault CA from VAULT_CACERT_BYTES. GH-1782
Add CLI support for exec env configs. GH-1761
Add function for HMAC SHA256. GH-1760
Bump go version from 1.19 to 1.20. GH-1783
Bump hashicorp/consul/api from 1.13.0 to 1.23.0. GH-1781 & GH-1758
Bump BurntSushi/toml from 1.2.1 to 1.3.2. GH-1766
Bump golang.org/x/sys from 0.10.0 to 0.11.0. GH-1788
Bump golang.org/x/net from 0.12.0 to 0.13.0. GH-1784
Bump golang.org/x/text from 0.7.0 to 0.10.0. GH-1763
Bump stretchr/testify from 1.8.2 to 1.8.4. GH-1757
Bump hashicorp/vault/api/auth/kubernetes from 0.3.0 to 0.4.1. GH-1755

REPO MAINTENANCE:

Code quality fixes and various lint improvements. GH-1762

v0.32.0 (May 18, 2023)

IMPROVEMENTS:

Add support for Vault agent environment variables. GH-1741
Upgrade hashicorp/vault/api from 1.8.2 to 1.9.1. GH-1743

REPO MAINTENANCE:

remove repo-specific codeql action, in favor of centralized job. GH-1740

v0.31.0 (Apr 06, 2023)

IMPROVEMENTS:

Added ExtFuncMap to allow external functions to be passed to the template. This gives users ability to add functions to the library and selective opaque existing ones. 1708
Vault: add new configuration option vault-client-user-agent, when set consul-template will use the set User-Agent when making requests to vault. This change is being made as part of a broader effort for Vault Agent to send its version as part of a User-Agent string in requests to Vault. Agent will then consume the latest version of consul-template, then use this new config to set the correct User-Agent. GH-1725
Upgrade golang.org/x/net from 0.4.0 to 0.7.0. GH-1711
Upgrade Sprig from v2 to v3. GH-1699
Upgrage github.com/stretchr/testify from 1.8.1 to 1.8.2 1726
Add copyright headers to file for compliance. GH-1721
Improve use of inclusive language GH-1731

v0.30.0 (Jan 09, 2023)

IMPROVEMENTS:

option to exit with an error upon failure to look up data (instead of blocking and waiting for it). [GH-1695, GH-1637]
tweak defaults for performance improvements [GH-1697, GH-1603]

BUG FIXES:

properly respect reload/kill configured signals [GH-1690, GH-1671]
Fix 'toTitle' function for a better support for word boundaries and unicode punctuation [GH-1678]

v0.29.6 (Nov 30, 2022)

BUG FIXES:

Force kill fails to kill the process group in exec mode [GH-1666, GH-1668]
Fix user set in dockerfile [GH-1662]
Module version update to x/text package for CVE-2022-32149, though the CVE didn't impact consul-template [GH-1655]

IMPROVEMENTS:

Update build to use 1.18+ to add template support for continue and break [GH-1663]
Template function 'splitToMap' [GH-1664]
Template function 'mustEnv' [GH-1657]

v0.29.5 (Oct 04, 2022)

BUG FIXES:

Fix issue with ownership change detection incorrectly indicating a change when a user or group was set but not both [GH-1652]
Fix issue with nomad configuration setup [GH-1653]

v0.29.4 (Sept 30, 2022)

BUG FIXES:

Fix goroutine leak in vault token watcher on config reload. [GH-1650]

v0.29.3 (Sept 30, 2022)

IMPROVEMENTS:

Vault token management refactor to increase encapsulation and enable testing. [GH-1645]

BUG FIXES:

Log child process successful exits at INFO level (not ERR). [GH-1649, GH-1282]
Fix reading vault agent token in wrapped format [GH-1498]
Fix issue with transient goroutine leak causing unnecessary memory growth. [GH-1644]
Fix issue with pkiCerts failing if cert file is moved. [GH-1639]

v0.29.2 (Aug 16, 2022)

IMPROVEMENTS:

Nomad services support use of byTab template function. [GH-1594]

BUG FIXES:

Fix issue with pkiCert caching certificate based on consul key path. [GH-1611, GH-1607]
Fix issue with setting the reload_signal to an empty string ("") not disabling the reload_signal as documented. [GH-1610, GH-1428, GH-1442]
Limit Setgpid setting to strictly sh -c wrapped calls. [GH-1600, GH-1604]
Fix potential for nil pointer dereference in vault config debug output. [GH-1586]

SECURITY:

Filter Vault Secrets from text/template error messages, CVE-2022-38149. [GH-1613]
Updates dependencies several of which had known CVEs. [GH-1622, GH-1614]

v0.29.1 (Jun 24, 2022)

IMPROVEMENTS:

Kubernetets Vault authentication support [GH-1580]
Nomad: add support for querying consistent subset of services [GH-1579]

BUG FIXES:

pkiCert now useful, getting the certificate, private key and CA [GH-1591, 1567]
fix issue with VaultConfig debug printing [GH-1587]
update crypto package version [GH-1592, GH-1582]
fix sort.Stable sorting [GH-1578]

v0.29.0 (Apr 20, 2022)

IMPROVEMENTS:

Nomad Service Discovery! [GH-1565]
New pkiCert template function provides self-caching certificates [GH-1559, GH-1259]
Add string trim template functions [GH-1558, GH-1544]

BUG FIXES:

Fix issue with multiple identical templates using the same path [GH-1573]
Reduce signal processing overhead [GH-1575, GH-1548]
Fix issue with template user/group setting [GH-1571, GH-1570]

v0.28.1 (Apr 04, 2022)

IMPROVEMENTS:

Allow setting template destination file ownership by name (with uid/gid compatibilty) [GH-1541, GH-1551]
better writeToFile user/group ownership behaviors [GH-1549]
configurable lease check wait for non-renewable secrets [GH-1546]

v0.28.0 (Mar 04, 2022)

BUG FIXES:

Fix issue returning typed nil pointers in template functions [GH-1535, GH-1418]
Support secret write queries w/ an empty write [GH-1532, GH-1453]

IMPROVEMENTS:

Add sprig library [GH-1312]
Add option to make template errors non-fatal [GH-1420, GH-1419, GH-1289]
Support for accepting a custom logger for a child process [GH-1515]
Add support for providing Consul ACL Token via a file [GH-1516, GH-1429]
Allow setting user/group ownership of template output [GH-1531, GH-1497, GH-639]
Logging to file [GH-1534, GH-1416]]
Support command/exec lists [GH-1543, GH-1518]

v0.27.2 (Nov 05, 2021)

BUG FIXES:

Syslog doesn't work after upgrade to 0.27 [GH-1523, GH-1529]

v0.27.1 (Sep 22, 2021)

IMPROVEMENTS:

Updated command execution on *nix systems to call the command directly, without the sh -c wrapping shell command, only in cases where the command is a single word (no spaces). This allows docker to run in environments (like a minimal docker image) where there is no shell (sh). Multi-word commands will continue to use the wrapping shell call. [GH-1509, GH-1508]

SECURITY:

Updated golang.or/x/crypto dependency for CVE-2020-29652. [GH-1507]

v0.27.0 (Aug 16, 2021)

BREAKING CHANGES:

All command execution calls are now made (on *nix systems) using a shell command call ('/bin/sh -c ...') with process group set to ensure all signals are propagated to the called commands. This was done to eliminate the need for parsing the shell command as it was a continual source of bugs. Windows systems currently only support single command calls because of no (known) 'sh -c' equivalent on Windows. [GH-1496, GH-1494]

IMPROVEMENTS:

New Docker Image. Similar to old Alpine image but modernized and simplified [GH-1481, GH-1484]
New, more obvious, log level environment variable [GH-1383]
New 'writeToFile' template function [GH-1495, GH-1077]
New mergeMap and mergeMapWithOverride template functions [GH-1500, GH-1499].

BUG FIXES:

Ignore SIGURG signals by default [GH-1486, GH-1487]
Fix issue with command argument parsing when using sub-shell calls [GH-1482]

v0.26.0 (Jun 10, 2021)

BREAKING CHANGES:

Docker: We have moved to a new Docker image build pipeline that is creating a simplified image containing only the executable, meant primarily to be used as a base image. If you would like the previous, more complex image back please file an issue. Thanks.

IMPROVEMENTS:

Arm CPUs no longer need special builds [GH-1471, GH-1404]
add 'md5sum' template function [GH-1464]
add 'envOrDefault' template function [GH-1461, GH-829]
configurable Vault default lease duration [GH-1446, GH-1445]
unescaped JSON template filter functions [GH-1432, GH-1430]
go spew debugging template functions [GH-1406]
add service tagged addresses to health service data [GH-1400, GH-1398]
allow running via Windows Service Control [GH-1382]

BUG FIXES:

fix command shell quoting issue [GH-1477, GH-1456, GH-1463]
rework logging, add tests and fix missing timestamp issue [GH-1476, GH-1475]
fix issue with connect/health services using same cache entry [GH-1474, GH-1458]
fix issue with ownership when perms option is set [GH-1473, GH-1379]
fixes issue with 'secrets' and Vault kv-v2 [GH-1468, GH-1274, GH-1275, GH-1462]

v0.25.2 (Feb 19, 2021)

BREAKING CHANGES:

version output from -v/-version should go to STDOUT (not STDERR)[GH-1452, GH-1455]
log date output format consistency fix [GH-1412]

BUG FIXES:

fix extra logging/broken log levels [GH-1438, GH-1426, GH-1454, ]
fix issue with vault secret panic/missing nil check [GH-1450, GH-1447]
Override block_query_wait doesn't work [GH-1441, GH-1443]

IMPROVEMENTS:

vault secret ttl handling [Gh-1451]

v0.25.1 (Jul 27, 2020)

IMPROVEMENTS:

Update whitelist/blacklist config options to allowlist/denylist with backward compatibility [GH-1388]

BUG FIXES:

Fix issue rendering empty file to disk [GH-1393][GH-1397]
Fix issue with Vault PKI cert expiration [GH-1394]
Fix issue reading Vault KVv2 secrets metadata [GH-1396][GH-1399]

v0.25.0 (Apr 27, 2020)

IMPROVEMENTS:

Add minimum and maximum math functions [GH-1323]
Allow overriding the default delimiter [GH-1290]
Add weights field for HealthService [GH-1288]
Beta support for Consul Namespaces (Consul Enterprise feature) [GH-1320, GH-1303]
Added sha256Hex function [GH-1327]
Make timeout for blocking query configurable [GH-1329]
docker: alpine without docker-base [GH-1333]
Add parseYAML helper [GH-1344]
Add lease calculation for rotating secrets [GH-1358]
Allow to set application name in syslog [GH-1367]

BUG FIXES:

Don't renew vault token when no token is set [GH-1352, GH-1297]
Fix bug looking up versioned vault secrets [GH-1354, GH-1350]
Fix issue reading kv2 vault secrets for key paths starting with "data" [GH-1341, GH-1340]
Fix data race in child.go [GH-1373, GH-1372]
Fix issue with template commands when used as library [GH-1370, GH-1369]

DOCUMENTATION:

How to run multiple things in template commands [GH-1375]
Template command_timeout clarifications [GH-1370, GH-1369]
ByMeta does not accept services as input [GH-1348]

v0.24.1 (Jan 24, 2020)

BUG FIXES:

Make user non-numeric to satisfy PSP [GH-1332]
fatal error: PowerRegisterSuspendResumeNotification failure on windows [GH-1335]

v0.24.0 (Jan 08, 2020)

BREAKING CHANGES:

Alpine Docker image no longer runs as root and so doesn't change ownership of the /consul-template/data and /consul-template/config directories to the consul-template user. See the Docker Image Use topic in the documentation for more.

BUG FIXES:

arm builds are linked against wrong library [GH-1317, GH-1326]
consul-template container runs as root - breaks CISO compliance [GH-1321, GH-1324]
'sockaddr' function returning whitespace after address [GH-1314, GH-1315]
runTemplate - DEBUG logging is needed to identify missing dependencies [GH-1308, GH-1309]
Remove code/logic for working with (long deprecated) Vault grace [GH-1284]

v0.23.0 (Nov 13, 2019)

IMPROVEMENTS:

Support Configuring Consul Connect Clients [GH-1262, GH-1304, GH-1306]

v0.22.1 (Nov 08, 2019)

SECURITY:

curl is vulnerable in the latest alpine docker image [GH-1302]

BUG FIXES:

fix breaking change for loop [GH-1285]

v0.22.0 (September 10, 2019)

IMPROVEMENTS:

Add rate limiting to consul api calls [GH-1279]
Add byMeta function [GH-1237]
Add support for : and = in service tag values [GH-1149, GH-1049]
Add explodeMap function [GH-1148]
Don't wait for splay when stopping child runner [GH-1141]
Add safels and safetree functions [GH-1132]
Support Vault certificates with no lease [GH-1106]
Add wrapper function for go-sockaddr templating [GH-1087]
Build binaries for arm64 platform [GH-1251]

BUG FIXES:

Fix arm/arm64 builds by enabling CGO and restricting builds to Linux [workaround for go/issues/32912]

v0.21.3 (September 05, 2019)

BUG FIXES:

Fix regression in non-renewable sleep [GH-1277, GH-1272, GH-1276]

v0.21.2 (August 31, 2019)

BUG FIXES:

Fix regression in backup [GH-1271, GH-1270]

v0.21.1 (August 30, 2019)

BUG FIXES:

Fixed issue in Vault call retry logic [GH-1269, GH-1224]
Fixed race in backup [GH-1265, GH-1264]
Fixed issue when reading deleted secret [GH-1260, GH-1198]
Fix issue with Vault writes [GH-1257, GH-1252]
Fix loop to work with template set integers [GH-1255, GH-1143]

v0.21.0 (August 05, 2019)

IMPROVEMENTS:

Migrated to use Go modules [GH-1244, GH-1173, GH-1208 GH-1232]
Template blacklist feature [GH-1243]

v0.20.1 (July 30, 2019)

BUG FIXES:

Fixed issue with exec running before template rendering when wait is set [GH-1229, GH-1209]
Fixed issue with templates not rendering with -once [GH-1227, GH-1196, GH-1207]
Fixed regression with ~/.vault-token and with vault_agent_token_file not respecting renew_token [GH-1228, GH-1189]
CA certificates missing from docker 'light' image [GH-1200]
Fixed issue with dedup data garbage in Consul KV [GH-1158, GH-1168]
Fixed bad case in import path [GH-1139]
Documented limits on using "." in service names [GH-1205]

v0.20.0 (February 19, 2019)

IMPROVEMENTS:

Support for Consul service metadata [GH-1113]
Support for Vault's KV v2 secrets engine, including versioned secrets [GH-1180].
Support for Vault Enterprise's namespaces feature [GH-1181].
Support for a new config parameter, vault_agent_token_file, which supports loading the Vault token from the contents of a dynamically updated file. This is intended for use in environments like Kubernetes [GH-1185].
A template's destination file will now have its user and group permissions preserved on supported OSes (Linux/MacOS) [GH-1061].

BUG FIXES:

The indent function no longer panics on negative spaces variable [GH-1127]
Fixed an issue that caused exec to not be called with multiple templates and wait configured [GH-1043]
Fixed an issue where Consul Template did not wait for most of a non-renewable secret's lease before attempting to refresh the secret. [GH-1183]

v0.19.5 (June 12, 2018)

BUG FIXES:

The de-duplication feature was incorrectly calculating the hash of dependency values over an unstable encoding of the data. This meant that in most cases the templates were being re-written to KV and on all watching template instances every minimum update time (i.e. wait { min = X }). At best this was a lot of wasted work, in some cases it caused 100% CPU usage when template instance leadership was split. [GH-1099, GH-1095]
Fixed an issue where we waited unnecessarily for a child process to exit [GH-1101]

IMPROVEMENTS:

Initiating runner log level moved to DEBUG [GH-1088]

v0.19.4 (October 30, 2017)

BREAKING CHANGES:

The version of Consul Template is now taken into account when using de-duplication mode. Without bundling the version, it's challenging to upgrade existing clusters or run multiple versions of Consul Template on the same cluster and template simultaneously. [GH-1025]

BUG FIXES:

Remove references to unsupported dump_signal configuration
Update vendor libraries to support Consul 1.0.0 changes for better test stability
Renew unwrapped Vault token (previously Consul Template) would try to renew the wrapped token, which would not work.
Do not sort results when ~near queries are used [GH-1027]
Handle integer overflow in exponential backoff calculations [GH-1031, GH-1028]
Properly preserve existing file permissions [GH-1037]

IMPROVEMENTS:

Compile with Go 1.9.2
The Vault grace period in the config is now set to 15 seconds as the default. This matches Vault's default configuration for consistency.
Add indent function for indenting blocks of text in templates
Allow additional colons in the template command on the CLI [GH-1026]
Add Vault Transit example for key exfiltration [GH-1014]
Add a new option for disabling recursive directory creation per template [GH-1033]
Allow dots in node names [GH-977]

v0.19.3 (September 11, 2017)

BUG FIXES:

Fix a bug that would cause once mode to not exit when the file pre-existed on disk with the correct contents. [GH-1000]

v0.19.2 (September 1, 2017)

BUG FIXES:

Fix a critical bug that would cause a hot loop for some TTL durations. [GH-1004]

v0.19.1 (August 25, 2017)

IMPROVEMENTS:

The runner's render event now includes the last-rendered template contents. This is useful when embedding Consul Template as a library. [GH-974-975]
Use the new Golang API renewer [GH-978]
Compile and build with Go 1.9

BUG FIXES:

Add per-template option error_on_missing_key. This causes the template to error when the user attempts to access a key in a map or field in a struct that does not exist. Previous behavior was to print <no value>, which might not be the desired behavior. This is opt-in behavior on a per-template basis. There is no global option. A future version of Consul Template will switch the default behavior to this safer format, but that change will be clearly called out as a breaking change in the future. Users should set error_on_missing_key = false in their configuration files if they are relying on the current <no value> behavior. [GH-973, GH-972]
Ensure all templates are rendered before spawning commands [GH-991, GH-995]

v0.19.0 (June 29, 2017)

BREAKING CHANGES:

All previous deprecation errors have been removed and associated configs or CLI options are no longer valid. It is highly recommended that you run v0.18.5 and resolve any deprecations before upgrading to this version!

IMPROVEMENTS:

Add new configuration option vault.grace, which configures the grace period between lease renewal and secret re-acquisition. When renewing a secret, if the remaining lease is less than or equal to the configured grace, Consul Template will request a new credential. This prevents Vault from revoking the credential at expiration and Consul Template having a stale credential. If you set this to a value that is higher than your default TTL or max TTL, Consul Template will always read a new secret!
Add a new option to datacenters to optionally ignore inaccessible datacenters [GH-908].

BUG FIXES:

Use the logger as soon as its available for output [GH-947]
Update Consul API library to fix a bug where custom CA configuration was ignored [GH-965]

v0.18.5 (May 25, 2017)

BREAKING CHANGES:

Retry now has a maximum default. Previous versions of Consul Template would retry indefinitely, potentially allowing the time between retries to reach days, months, or years due to the exponential nature. Users wishing to use the old behavior should set max_backoff = 0 in their configurations. [GH-940]

IMPROVEMENTS:

Add support for MaxBackoff in Retry options [GH-938, GH-939]
Compile with Go 1.8.3

v0.18.4 (May 25, 2017)

BUG FIXES:

Compile with go 1.8.2 for the security fix. The code is exactly the same as v0.18.3.

v0.18.3 (May 9, 2017)

IMPROVEMENTS:

Add support for local datacenter in node queries [GH-862, GH-927]
Add support for service tags on health checks [Consul vendor update]

BUG FIXES:

Seed the random generator for splay values
Reset retries counter on successful contact [GH-931]
Return a nil slice instead of an error for non-existent maps [GH-906, GH-932]
Do not return data in dedup mode if the template is unchanged [GH-933 GH-698]

NOTABLE:

Consul Template is now built with Go 1.8.1
Update internal library to Consul 0.8.2 - this should not affect any users

v0.18.2 (March 28, 2017)

IMPROVEMENTS:

Add missing HTTP transport configuration options
Add modulo function for performing modulo math

BUG FIXES:

Default transport max idle connections based on GOMAXPROCS
Read VAULT_* envvars before finalizing [GH-914, GH-916]
Register []*KeyPair as a gob [GH-893]

v0.18.1 (February 7, 2017)

IMPROVEMENTS:

Add support for tagged addresses and metadata [GH-863]
Add .exe extension to Windows binaries [GH-875]
Add support for customizing the low-level transport details for Consul and Vault [GH-880, GH-877]
Read token from ~/.vault-token if it exists [GH-878, GH-884]

BUG FIXES:

Resolve an issue with filters on health service dependencies [GH-857]
Restore ability to reload configurations from disk [GH-866]
Move env back to a helper function [GH-882]

This was causing a lot of issues for users, and it required many folks to re-write their templates for the small benefit of people running in de-duplicate mode who did not understand the trade-offs. The README is now updated with the trade-offs of running in dedup mode and the expected env behavior has been restored.
Do not loop indefinitely if the dedup manager is unable to acquire a lock [GH-864]

v0.18.0 (January 20, 2017)

NEW FEATURES:

Add new template function keyExists for determining if a key is present. See the breaking change notice before for more information about the motivation for this change.
Add scratch for storing information across a template invocation. Scratch is especially useful when saving a computed value to use it across a template. Scratch values are not shared across multiple templates and are not persisted between template invocations
Add support for controlling retry behavior for failed communications to Consul or Vault. By default, Consul Template will now retry 5 times before returning an error. The backoff timing and number of attempts can be tuned using the CLI or a configuration file.
Add executeTemplate function for executing a defined template.
Add base64Decode, base64Encode, base64URLDecode, and base64URLEncode functions for working with base64 encodings.
Add containsAll, containsAny, containsNone, and containsNotAll functions for easy filtering of multiple tag selections.

BREAKING CHANGES:

Consul Template now blocks on key queries. The previous behavior was to always pass through, allowing users to use the existence of a key as a source of control flow. This caused confusion among many users, so we have restored the expected behavior of blocking on a key query, but have added keyExists to check for the existence of a key. Note that the keyOrDefault function remains unchanged and will not block if the value is nil, as expected.
The vault template function has been removed. This has been deprecated with a warning since v0.14.0.
A shell is no longer assumed for Template commands. Previous versions of Consul Template assumed /bin/sh (cmd on Windows) as the parent process for the template command. Due to user requests and a desire to customize the shell, Consul Template no longer wraps the command in a shell. For most commands, this change will be transparent. If you were utilizing shell-specific functions like &&, ||, or conditionals, you will need to wrap you command in a shell, for example:
```
-template "in.tpl:out.tpl:/bin/bash -c 'echo a || b'"
```
or
```
template {
  command = "/bin/bash -c 'echo a || b'"
}
```
The env function is now treated as a dependency instead of a helper. For most users, there will be no impact.
This release is compiled with Golang v1.8. We do not expect this to cause any issues, but it is worth calling out.

DEPRECATIONS:

.Tags.Contains is deprecated. Templates should make use of the built-in in and contains functions instead. For example:
```
{{ if .Tags.Contains "foo" }}
```
becomes:
```
{{ if .Tags | contains "foo" }}
```
or:
```
{{ if "foo" | in .Tags }}
```
key_or_default has been renamed to keyOrDefault to better align with Go's naming structure. The old method is aliased and will remain until a future release.
Consul-specific CLI options are now prefixed with -consul-:
- -auth is now -consul-auth
- -ssl-(.*) is now -consul-ssl-$1
- -retry is now -consul-retry and has been broken apart into more specific CLI options.
Consul-specific configuration options are now nested under a stanza. For example:
```
auth {
  username = "foo"
  password = "bar"
}
```
becomes:
```
consul {
  auth {
    username = "foo"
    password = "bar"
  }
}
```
This applies to the auth, retry, ssl, and token options.

IMPROVEMENTS:

Add CLI support for all SSL configuration options for both Consul and Vault. Vault options are identical to Consul but with vault- prefix. Includes the addition of ssl-ca-path to be consistent with file-based configuration options.
- ssl vault-ssl (Enable)
- ssl-verify vault-ssl-verify
- ssl-cert vault-ssl-cert
- ssl-key vault-ssl-key
- ssl-ca-cert vault-ssl-ca-cert
- ssl-ca-path vault-ssl-ca-path
- ssl-server-name vault-ssl-server-name
Add -consul-ssl-server-name
Add -consul-ssl-ca-path
Add -consul-retry
Add -consul-retry-attempts
Add -consul-retry-backoff
Add -vault-retry
Add -vault-retry-attempts
Add -vault-retry-backoff
Add support for server_name option for TLS configurations to allow specification of the expected certificate common name.
Add -vault-addr CLI option for specifying the Vault server address [GH-740, GH-747]
Add tagged addresses to Node structs
Add support for multiple -config flags [GH-773, GH-751]
Add more control over template command execution
Add a way to programatically track the dependencies a particular template is blocked on [GH-799]

BUG FIXES:

Fix -renew-token flag not begin honored on the CLI [GH-741, GH-745]
Allow * in key names [GH-789, GH-755]

v0.16.0 (September 22, 2016)

NEW FEATURES:

Exec Mode! Consul Template can now act as a faux-supervisor for applications. Please see the Exec Mode documentation for more information.
Vault Token Unwrapping! Consul Template can now unwrap Vault tokens that have been wrapped using Vault's cubbyhole response wrapping. Simply add the unwrap_token option to your Vault configuration stanza or pass in the -vault-unwrap-token command line flag.

BREAKING CHANGES:

Consul Template no longer terminates on SIGTERM or SIGQUIT. Previous versions were hard-coded to listen for SIGINT, SIGTERM, and SIGQUIT. This value is now configurable, and the default is SIGINT. SIGQUIT will trigger a core dump in accordance with similar programs. SIGTERM is no longer listened.
Consul Template now exits on irrecoverable Vault errors such as failing to renew a token or lease.

DEPRECATIONS:

The vault.renew option has been renamed to vault.renew_token for added clarity. This is backwards-compatible for this release, but will be removed in a future release, so please update your configurations accordingly.

IMPROVEMENTS:

Permit commas in key prefix names [GH-669]
Add configurable kill and reload signals [GH-686]
Add a command line flag for controlling whether a provided Vault token will be renewed [GH-718]

BUG FIXES:

Allow variadic template function for secret [GH-660, GH-662]
Always log in UTC time
Log milliseconds [GH-676, GH-674]
Maintain template ordering [GH-683]
Add Service address to catalog node response [GH-687]
Do not require trailing slashes [GH-706, GH-713]
Wait for all existing dedup acquire attempts to finish [GH-716, GH-677]

v0.15.0.dev (June 9, 2016)

BREAKING CHANGES:

Removing reaping functionality [GH-628]

IMPROVEMENTS:

Allow specifying per-template delimiters [GH-615, GH-389]
Allow specifying per-template wait parameters [GH-589, GH-618]
Switch to actually vendoring dependencies
Add support for writing data [GH-652, GH-492]

BUG FIXES:

Close open connections when reloading configuration [GH-591, GH-595]
Do not share catalog nodes [GH-611, GH-572, GH-603]
Properly handle empty string in ParseUint [GH-610, GH-609]
Cache Vault's original lease duration [5b955a8]
Use decimal division for calculating Vault lease durations [87d61d9]
Load VAULT_TOKEN environment variable [2431448]
Properly clean up quiescence timers when using multiple templates [GH-616]
Print a nice error if K/V cannot be exploded [GH-617, GH-596]
Update documentation about symlinks [GH-579]
Properly parse file permissions in mapstructure [GH-626]

v0.14.0 (March 7, 2016)

DEPRECATIONS:

The vault template API function has been renamed to secret to be in line with other tooling. The vault API function will continue to work but will print a warning to the log file. A future release of Consul Template will remove the vault API.

NEW FEATURES:

Add secrets template API for listing secrets in Vault. Please note this requires Vault 0.5+ and the secret backend must support listing. Please see the Vault documentation for more information [GH-270]

IMPROVEMENTS:

Allow passing any kind of object to toJSON in the template. Previously this was restricted to key-value maps, but that restriction is now removed. [GH-553]

BUG FIXES:

Parse file permissions as a string in JSON [GH-548]
Document how to reload config with signals [GH-522]
Stop all dependencies when reloading the running/watcher [GH-534, GH-568]

v0.13.0 (February 18, 2016)

BUG FIXES:

Compile with go1.6 to avoid race [GH-442]
Switch to using a pooled transport [GH-546]

v0.12.2 (January 15, 2016)

BUG FIXES:

Fixed an issue when running as PID 1 in a Docker container where Consul Template could consume CPU and spuriously think its spwaned sub-processes had failed [GH-511]

v0.12.1 (January 7, 2016)

IMPROVEMENTS:

Add support for math operations on uint types [GH-483, GH-484]
Make check information available through health service [GH-490]

BUG FIXES:

Store vault data on the dependency and handle an error where a failed lease renewal would result in <no data> in the rendered template. Please note, there is a bug in Vault 0.4 with respect to lease renewals that makes it inoperable with Consul Template. Please either use Vault 0.3 or wait until Vault 0.5 is released (the bug has already been fixed on master). [GH-468, GH-493, GH-504]

v0.12.0 (December 10, 2015)

BREAKING CHANGES:

Add support for checking if a node is in maintenance mode [GH-477, GH-455]

Previously, Consul Template would report nodes in maintenance mode as "critical". They will now report as "maintenance" so users can perform more detailed filtering. It is unlikely, but if you were filtering critical services, nodes/services in maintenance mode will no longer be included.

FEATURES:

Add support for de-duplication mode. In de-duplication mode, Consul Template uses leader election to elect one Consul Template process to render a template. The results of this template are rendered into Consul's key-value store, and other templates pull from the pre-rendered template. This option is off by default, but it is highly recommended that the option is enabled for clusters with a high load factor (number of templates x number of dependencies per template). [GH-465]
Add support for automatically reaping child processes. This is very useful when running Consul Template as PID 1 (like in a Docker container) when no init system is present. The option is configurable, but it defaults to "on" when the Consul Template process is PID 1. [GH-428, GH-479]

IMPROVEMENTS:

Use the renew-self endpoint instead of renew for renewing the token [GH-450]
Allow existing templates to be backed up before writing the new one [GH-464]
Add support for TLS/SSL mutual authentication [GH-448]
Add support for checking if a node is in maintenance mode [GH-477, GH-455]

v0.11.1 (October 26, 2015)

FEATURES:

Accept "unix" as an argument to timestamp to generate a unix timestamp [GH-422]

IMPROVEMENTS:

Make Path a public field on the vault secret dependency so other libraries can access it

BUG FIXES:

Ensure there is a newline at the end of the version output
Update README development instructions [GH-423]
Adjust error messages so that data does not always "come from Consul"
Fix race conditions in tests
Update the LastContact value for non-Consul dependencies to always return 0 [GH-432, GH-433]
Always use DefaultConfig() in tests to find issues
Fix broken math functions - previously add, subtract, multiply, and divide for integers would perform the operation on only the first operand [GH-430, GH-435]
Renew the vault token based off of the auth, not the secret [GH-443]
Remove noisy log message [GH-445]

v0.11.0 (October 9, 2015)

BREAKING CHANGES:

Allow configuration of destination file permissions [GH-415, GH-358]

Previously, Consul Template would inspect the file at the destination path and mirror those file permissions, if a file existed. If a file did not exist, Consul Template would render the file with 0644 permissions. This was acceptable behavior in a pre-Vault world, but now that Consul Template is capable of rendering secrets, there is a desire for increased security. As such, Consul Template no longer mirrors existing destination file permissions. Instead, users can specify the file permissions in the configuration file. Please see the README for examples. If you were previously relying on an existing file's file permissions to enfore the destination file permissions, you must switch to specifying the file permissions in the configuration file. If you were not dependent on this behavior, nothing has changed; the default value is still 0644.

FEATURES:

Add in and contains functions for checking if a slice or array contains a given value [GH-366]
Add add function for calculating the sum of integers/floats
Add subtract function for calculating the difference of integers/floats
Add multiply function for calculating the product of integers/floats
Add divide function for calculating the division of integers/floats

IMPROVEMENTS:

Sort serivces by ID as well
Add a mechanism for renewing the given Vault token [GH-359, GH-367]
Default max-stale to 1s - this severely reduces the load on the Consul leader by allowing followers to respond to API requests [GH-386, GH-397]
Add GPG signing for SHASUMS on new releases
Push watcher errors down to the client in once mode [GH-361, GH-418]

BUG FIXES:

Set ssl in the CLI [GH-321]
Regression - Reload configuration on SIGHUP [GH-332]
Remove port option from service query and documentation - it was unused and legacy, but was causing issues and confusion [GH-333]
Return the empty value when no parsable value is given [GH-353]
Start with a blank configuration when reloading via SIGHUP [GH-393, GH-394]
Use an int64 instead of an int to loop function [GH-401, GH-402]
Do not remove the Windows file if it exists [GH-378]

v0.10.0 (June 9, 2015)

FEATURES:

Add plugin and plugin ecosystem
Add parseBool function for parsing strings into booleans (GH-312)
Add parseFloat function for parsing strings into float64 (GH-312)
Add parseInt function for parsing strings into int64 (GH-312)
Add parseUint function for parsing strings into uint64 (GH-312)
Add explode function for exploding the result of tree or ls into a deeply nested hash (GH-311)
Add toJSON and toJSONPretty function for exporting the result of tree or ls into a JSON hash (GH-311)
Add toYAML function for exporting the result of tree or ls into a YAML document (GH-311)
Add node function for querying nodes (GH-306, GH-309)
Add split function for splitting a string on a separator (GH-285)
Add join function for joining a string slice on a given key (GH-285)
Add pid_file configuration and command line option for specifying the location of a pid file on disk (GH-281, GH-286)

IMPROVEMENTS:

Allow setting log_level via the configuration file (CLI still take precedence if specified)
Improve error reporting when loading multiple configs by including the path on the configuration file that had an error (GH-275)
Add a timeout around command execution to prevent hanging (GH-283)
Read Vault/Consul environment variables for the config (GH-307, GH-308)

BUG FIXES:

Properly merge "default" config values with user-supplied values (GH-271)

v0.9.0 (April 29, 2015)

FEATURES:

Add Vault functionality for querying secrets from Vault (GH-264)
Add regexMatch template helper to determine if a result matches the given regular expressions (GH-246)
Add support for ssl-cert and ss-ca-cert options (GH-255)

IMPROVEMENTS:

Expand byTag to accept catalog services as well (GH-249, GH-250)
Allow catalog service tags to use the .Contains function (GH-261)

BUG FIXES:

Send the standard error of commands back over the standard error of Consul Template (GH-253, GH-254)
Allow specifying -v in addition to -version to get the version output

v0.8.0 (March 30, 2015)

FEATURES:

Add .Size() so the watcher can report its size (GH-206)
Add byKey template helper to group the results of a tree function by their containing directory (GH-207, GH-209, GH-241)
Add timestamp template function for returning the current timestamp with the ability to add custom formatting (GH-225, GH-230)
Add loop template function for iteration (GH-238, GH-221)

IMPROVEMENTS:

Expose LastIndex and ReceivedData from the Watcher
Add unimplemented KV fields (GH-203)
Warn the user if there are a large number of dependencies (GH-205)
Extend documentation on how health service dependencies are downloaded from Consul (GH-212)
Allow empty configuration directories (GH-217)
Document caveats around using parseJSON during multi-evaluation
Print the final configuration as JSON in debug mode (GH-231)
Export certain environment variables when executing commands that are read by other Consul tooling or in your scripts (GH-232) - see the README for more information
Adjust logging to be less noisy without compromising information (GH-242)

BUG FIXES:

Properly filter services by their type (GH-210, GH-212)
Return an error if extra arguments are given on the command line (GH-227)
Do not overwrite given configuration with the default options (GH-228, GH-219)
Check for the correct conditions when using basic authentication (GH-220)
Remove unused code paths for clarity (GH-242)
Remove race condition in templates when called concurrently (GH-242)
Remove race condition in test suite (GH-242)
Force a refresh if Consul's WaitIndex is less than our current value (GH-242)
Avoid pushing data onto the watcher when the view has been stopped (GH-242)
Do not accept data in the runner for an unwatched dependency (GH-198, GH-242)

v0.7.0 (February 19, 2015)

BREAKING CHANGES:

Remove ssl configuration option from templates - use an ssl configuration block with enabled = true instead
Remove ssl_no_verify configuration option from templates - use an ssl configuration block with verify = false instead
Restructure CLI -ssl-no-verify to -ssl-verify - to disable SSL certification validation on the command line, use -ssl-verify=false
Remove auth configuration option from templates - use an auth configuration block with enabled = true combined with username = ... and password = ... inside the block instead

FEATURES:

Add support for logging to syslog (GH-163)
Add log_level as a configuration file option
Add -log-level as a CLI option

IMPROVEMENTS:

Use a default retry interval of 5s (GH-190) - this value has been (and will remain) configurable since v0.5.0, but the default value has changed from 0 to 5s
Use a service's reported address if given (GH-185, GH-186)
Add new NodeAddress field to health services to always include the node's address
Return errors up the watcher's error channel so other libraries can determine what to do with the error instead of swallowing it (GH-196)
Move SSL and authentication options into their own configuration blocks in the HCL
Add new watch.WaitVar for parsing Wait structs via Go's flag parsing library.
Extract logging components into their own library for sharing (GH-199)

BUG FIXES:

Return errors instead of nil in catalog nodes and key prefix dependencies (GH-192)
Allow Consul Template to exit when running in once mode and templates have not changed (GH-188)
Raise an error when specifying a non-existent option in the configuration file (GH-197)
Use an RWLock when accessing information in the Brain to improve performance
Improve debugging output and consistency
Remove unused Brain functions
Remove unused documentation items
Use the correct default values for -ssl and -retry on the CLI

v0.6.5 (February 5, 2015)

FEATURES:

Add -max-stale to specify Consul Template may talk to non-leader Consul nodes if they are less than the maximum stale value (GH-183)

BUG FIXES:

Fix a concurrency bug in the Brain (GH-180)
Add a better queue-draining mechanism for templates that have a large number of dependencies (GH-184)

v0.6.1 (February 2, 2015)

IMPROVEMENTS:

Allow watcher to use buffered channels so we do not block when multiple dependencies return data (GH-176)
Buffer results from the watcher to reduce the number of CPU cycles (GH-168 and GH-178)

BUG FIXES:

Handle the case where reloading via SIGHUP would cause an error (GH-175 and GH-177)
Return errors to the template when parsing a key fails (GH-170)
Expand the list of possible values for keys to non-ASCII fields (the @ is still a restricted character because it denotes the datacenter) (GH-170)
Diff missing dependencies during the template render to avoid creating extra watchers (GH-169)
Improve debugging output (GH-169)

v0.6.0 (January 20, 2015)

FEATURES:

Implement n-pass evaluation (GH-64) - templates are now evaluated N+1 times to properly accumulate dependencies and build the graph properly

BREAKING CHANGES:

Remove storeKeyPrefix template function - it has been replaced with ls and/or tree and was deprecated in 0.2.0
Remove Key() from dependency interface

IMPROVEMENTS:

Switch to using hashicorp/consul/api instead of armon/consul-api
Add support for communicating with Consul via HTTPS/SSL (GH-143)
Add support for communicating with Consul via BasicAuth (GH-147)
Quiesce on a per-template basis

BUG FIXES:

Reduce memory footprint when running with a large number of templates by using a single context instead of separate template contexts for each template
Improve test coverage
Improve debugging output
Correct tag deep copy that could result in 2N-1 tags (GH-155)
Return an empty slice when parsing an empty JSON file
Update README documentation

v0.5.1 (December 25, 2014)

BUG FIXES:

Parse Retry values in the config (GH-136)
Remove util package as it is a code smell and separate Watcher and Dependency structs and functions into their own packages for re-use (GH-137)

v0.5.0 (December 19, 2014)

FEATURES:

Reload configuration on SIGHUP
Add services template function for listing all services and associated tags in the Consul catalog (GH-77)

BUG FIXES:

Do not execute the same command more than once in one run (GH-112)
Do not exit when Consul is unavailable (GH-103)
Accept configuration files as a valid option to -config (GH-126)
Accept Windows drive letters in template paths (GH-78)
Deep copy and sort data returned from Consul API (specifically tags)
Run commands even if not all templates have received data (GH-119)

IMPROVEMENTS:

Add support for more complex service health filtering (GH-116)
Add support for specifying a -retry interval for Consul timeouts and connection errors (GH-22)
Use official HashiCorp multierror package for errors
Gracefully stop watchers on interrupt
Add support for Go 1.4
Improve test coverage around retrying failures

v0.4.0 (December 10, 2014)

FEATURES:

Add env template function for reading an environment variable in the current process into the template
Add regexReplaceAll template function

BUG FIXES:

Fix documentation examples
Fix golint and go vet errors
Fix a panic when Consul returned empty query metadata
Allow colons in key prefixes (ls and tree receive this by proxy)
Allow parseJSON to handle top-level JSON objects
Filter empty keys in tree and ls (folder nodes)

IMPROVEMENTS:

Merge multiple configuration template definitions when a configuration directory is specified

v0.3.1 (November 24, 2014)

BUG FIXES:

Allow colons in key names (GH-67)
Fix a documentation bug in the README in the Varnish example (GH-82)
Attempt to render templates before starting the watcher - this fixes an issue where a template that declared no Consul dependencies would never be rendered (GH-85)
Update inline Go documentation for better clarity

IMPROVEMENTS:

Fix all issues raised by go vet
Update packaging script to fix ZSHisms and use awk for clarity

v0.3.0 (November 13, 2014)

FEATURES:

Added a Contains method to Service.Tags
Added support for specifying a configuration directory in -config, in addition to a file
Added support for querying all nodes in Consul's catalog with the nodes template function

BUG FIXES:

Update README documentation to clarify that service dependencies default to the current datacenter if one is not explicitly given
Ignore empty keys that are returned from an ls call (GH-54)
When writing a file atomicly, ensure the drive is the same (GH-58)
Run all commands before exiting - previously if a single command failed in a multi-template environment, the other commands would not execute, but Consul Template would return

IMPROVEMENTS:

Added support for querying all service nodes by passing an additional parameter to service

v0.2.0 (November 4, 2014)

FEATURES:

Added helper for decoding a result as JSON using the parseJSON pipe function
Added support for reading and watching changes from a file using the file template function
Added helper for sorting service entires by a particular tag
Added helper function toLower() for converting a string to lowercase
Added helper function toTitle() for converting a string to titlecase
Added helper function toUpper() for converting a string to uppercase
Added helper function replaceAll() for replacing occurrences of a substring with a new string
Added tree function for returning all key prefixes recursively
Added ls function for returning all keys in the top-level prefix (but not deeply nested ones)

BUG FIXES:

Remove prefixes from paths when querying a key prefix

IMPROVEMENTS:

Moved shareable functions into a util module so other libraries can benefit
Make Path a public field on Template
Added more examples and documentation to the README

DEPRECATIONS:

keyPrefix is deprecated in favor or tree and ls and will be removed in the next major release

v0.1.1 (October 28, 2014)

BUG FIXES:

Fixed an issue where help output was displayed twice when specifying the -h flag
Added support for specifyiny forward slashes (/) in service names
Added support for specifying underscores (_) in service names
Added support for specifying dots (.) in tag names

IMPROVEMENTS:

Added support for Travis CI
Fixed numerous typographical errors
Added more documentation, including an FAQ in the README
Do not return an error when a template has no dependencies. See GH-31 for more background and information
Do not render templates if they have the same content
Do not execute commands if the template on disk would not be changed

v0.1.0 (October 21, 2014)

Initial release

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