[taler-grid5k] 40/73: document variables

[gnunet]

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marco-boss pushed a commit to branch master
in repository grid5k.

commit 2a31f3e30da13113791d8b37864340c53d271b12
Author: Boss Marco <bossm8@bfh.ch>
AuthorDate: Wed Dec 1 14:24:50 2021 +0100

    document variables
---
 image/README.md | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/image/README.md b/image/README.md
index 4d42c12..cc52c66 100644
--- a/image/README.md
+++ b/image/README.md
@@ -11,10 +11,27 @@ Official documentation can be found on these links:
 Replace `<G5K_USER>` with your Grid5000 username.
 This variable is required, if not specified the build will fail.
 
-`kameleon build -g g5k_user:<G5K_USER> taler-debian11`
+```bash
+kameleon build -g g5k_user:<G5K_USER> taler-debian11
+```
 
 **NOTE** Make sure that all dependencies listed in `Grid5000 Environment` are 
installed
 
+### Additional Variables
+
+The Taler binaries are built from source. You have the possiblity to override 
the commit from 
+which should be built with the following variables (default `master`):
+
+`gnunet_commit_sha`, `exchange_commit_sha`, `merchant_commit_sha`, 
`wallet_commit_sha` and `grid5k_commit_sha`
+
+To override them you must add them to the `-g` option of `kameleon build`:
+
+```bash
+kameleon build -g g5k_user:<G5K_USER> gnunet_commit_sha:master 
grid5k_commit_sha:node-setup taler-debian11
+```
+
+For more information please run `kameleon build --help`
+
 ### Deploy
 
 Copy the image to a Grid5000 site:

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