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docs: userguide: labels-custom-metadsata.md: update syntax for emtpy value labels 

Signed-off-by: Antonio Murdaca <runcom@redhat.com>
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Antonio Murdaca 2015-12-16 13:43:41 +01:00 committed by Tibor Vass
parent 1b77149fd4
commit 8008a57ffb
1 changed files with 6 additions and 3 deletions
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man/Dockerfile.5.md
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@ -156,20 +156,23 @@ A Dockerfile is similar to a Makefile.
the image. the image.
**LABEL** **LABEL**
-- `LABEL <key>[=<value>] [<key>[=<value>] ...]`or -- `LABEL <key>=<value> [<key>=<value> ...]`or
``` ```
LABEL <key>[ <value>] LABEL <key>[ <value>]
LABEL <key>[ <value>] LABEL <key>[ <value>]
... ...
``` ```
The **LABEL** instruction adds metadata to an image. A **LABEL** is a The **LABEL** instruction adds metadata to an image. A **LABEL** is a
key-value pair. To include spaces within a **LABEL** value, use quotes and key-value pair. To specify a **LABEL** without a value, simply use an empty
string. To include spaces within a **LABEL** value, use quotes and
backslashes as you would in command-line parsing. backslashes as you would in command-line parsing.
``` ```
LABEL com.example.vendor="ACME Incorporated" LABEL com.example.vendor="ACME Incorporated"
or
LABEL com.example.vendor "ACME Incorporated" LABEL com.example.vendor "ACME Incorporated"
LABEL com.example.vendor.is-beta ""
LABEL com.example.vendor.is-beta=
LABEL com.example.vendor.is-beta=""
``` ```
An image can have more than one label. To specify multiple labels, separate An image can have more than one label. To specify multiple labels, separate