Add --since argument to docker logs cmd

Added --since argument to `docker logs` command. Accept unix
timestamps and shows logs only created after the specified date.

Default value is 0 and passing default value or not specifying
the value in the request causes parameter to be ignored (behavior
prior to this change).

Signed-off-by: Ahmet Alp Balkan <ahmetalpbalkan@gmail.com>

contrib/completion/bash/docker

@@ -593,7 +593,7 @@ _docker_logs() {
 
 	case "$cur" in
 		-*)
-			COMPREPLY=( $( compgen -W "--follow -f --help --tail --timestamps -t" -- "$cur" ) )
+			COMPREPLY=( $( compgen -W "--follow -f --help --since --tail --timestamps -t" -- "$cur" ) )
 			;;
 		*)
 			local counter=$(__docker_pos_first_nonflag '--tail')

contrib/completion/fish/docker.fish

@@ -233,6 +233,7 @@ complete -c docker -f -n '__fish_docker_no_subcommand' -a logs -d 'Fetch the log
 complete -c docker -A -f -n '__fish_seen_subcommand_from logs' -s f -l follow -d 'Follow log output'
 complete -c docker -A -f -n '__fish_seen_subcommand_from logs' -l help -d 'Print usage'
 complete -c docker -A -f -n '__fish_seen_subcommand_from logs' -s t -l timestamps -d 'Show timestamps'
+complete -c docker -A -f -n '__fish_seen_subcommand_from logs' -l since -d 'Show logs since timestamp'
 complete -c docker -A -f -n '__fish_seen_subcommand_from logs' -l tail -d 'Output the specified number of lines at the end of logs (defaults to all logs)'
 complete -c docker -A -f -n '__fish_seen_subcommand_from logs' -a '(__fish_print_docker_containers running)' -d "Container"
 

contrib/completion/zsh/_docker

@@ -305,6 +305,7 @@ __docker_subcommand () {
         (logs)
             _arguments \
                 {-f,--follow}'[Follow log output]' \
+                '-s,--since[Show logs since timestamp]' \
                 {-t,--timestamps}'[Show timestamps]' \
                 '--tail=-[Output the last K lines]:lines:(1 10 20 50 all)' \
                 '*:containers:__docker_containers'

docs/sources/reference/commandline/cli.md

@@ -1632,6 +1632,7 @@ For example:
     Fetch the logs of a container
 
       -f, --follow=false        Follow log output
+      --since=""                Show logs since timestamp
       -t, --timestamps=false    Show timestamps
       --tail="all"              Number of lines to show from the end of the logs
 
@@ -1651,6 +1652,10 @@ timestamp, for example `2014-09-16T06:17:46.000000000Z`, to each
 log entry. To ensure that the timestamps for are aligned the
 nano-second part of the timestamp will be padded with zero when necessary.
 
+The `--since` option shows logs of a container generated only after
+the given date, specified as RFC 3339 or UNIX timestamp. The `--since` option
+can be combined with the `--follow` and `--tail` options.
+
 ## pause
 
     Usage: docker pause CONTAINER [CONTAINER...]