Kaniko capital letter

build.sh

#!/bin/bash

# the following build fails but should pass
gcloud builds submit --config=uppercase.yml  | tee uppercase.log


# the following build should pass
gcloud builds submit --config=lowercase.yml  | tee lowercase.log

Dockerfile-lowercase

# the name 'Library' causes a problem. but 'library' (lowercase) works fine
FROM python:3.7.2 AS library 

FROM library

RUN echo "another line"

Dockerfile-uppercase

# the name 'Library' causes a problem. but 'library' (lowercase) works fine
FROM python:3.7.2 AS Library 

FROM Library

RUN echo "another line"

lowercase.log

--------------------------------- REMOTE BUILD OUTPUT ----------------------------------
starting build "19c521ec-ca79-4940-a896-fcd48f9e7ac8"

FETCHSOURCE
Fetching storage object: gs://my-project_cloudbuild/source/1568633260.29-77d992c672ea49c290cb81b6ff662509.tgz#1568633259466313
Copying gs://my-project_cloudbuild/source/1568633260.29-77d992c672ea49c290cb81b6ff662509.tgz#1568633259466313...
/ [0 files][    0.0 B/  1.3 KiB]                                                
/ [1 files][  1.3 KiB/  1.3 KiB]                                                
Operation completed over 1 objects/1.3 KiB.                                      
BUILD
Already have image (with digest): gcr.io/kaniko-project/executor@sha256:584a8d90679211d9b09465d778990ec15965cf78f57f197e973d57d14b08eb81
INFO[0000] Resolved base name python:3.7.2 to python:3.7.2 
INFO[0000] Resolved base name library to library        
INFO[0000] Resolved base name python:3.7.2 to python:3.7.2 
INFO[0000] Resolved base name library to library        
INFO[0000] Downloading base image python:3.7.2          
INFO[0000] Error while retrieving image from cache: getting file info: stat /cache/sha256:9db2a731d3c7970453d37f5f92708ffd1255d12a76517fb24f944ca3d4f84f8e: no such file or directory 
INFO[0000] Downloading base image python:3.7.2          
INFO[0001] Built cross stage deps: map[]                
INFO[0001] Downloading base image python:3.7.2          
INFO[0001] Error while retrieving image from cache: getting file info: stat /cache/sha256:9db2a731d3c7970453d37f5f92708ffd1255d12a76517fb24f944ca3d4f84f8e: no such file or directory 
INFO[0001] Downloading base image python:3.7.2          
INFO[0001] Skipping unpacking as no commands require it. 
INFO[0001] Taking snapshot of full filesystem...        
INFO[0001] Storing source image from stage 0 at path /kaniko/stages/0 
INFO[0004] Deleting filesystem...                       
INFO[0004] Base image from previous stage 0 found, using saved tar at path /kaniko/stages/0 
INFO[0005] Unpacking rootfs as cmd RUN echo "another line" requires it. 
INFO[0018] Taking snapshot of full filesystem...        
INFO[0030] RUN echo "another line"                      
INFO[0030] cmd: /bin/sh                                 
INFO[0030] args: [-c echo "another line"]               
another line
INFO[0030] Taking snapshot of full filesystem...        
INFO[0034] No files were changed, appending empty layer to config. No layer added to image. 
PUSH
DONE
----------------------------------------------------------------------------------------

ID                                    CREATE_TIME                DURATION  SOURCE                                                                                    IMAGES  STATUS
19c521ec-ca79-4940-a896-fcd48f9e7ac8  2019-09-16T11:27:39+00:00  44S       gs://my-project_cloudbuild/source/1568633260.29-77d992c672ea49c290cb81b6ff662509.tgz  -       SUCCESS

lowercase.yml

steps:
 - name: gcr.io/kaniko-project/executor@sha256:584a8d90679211d9b09465d778990ec15965cf78f57f197e973d57d14b08eb81
   args:
      - --dockerfile=Dockerfile-lowercase
      - --destination=gcr.io/my-project/kaniko_fail_example_capital # note: change 'your-project' to your google cloud 

uppercase.log

--------------------------------- REMOTE BUILD OUTPUT ----------------------------------
starting build "7e1de778-143d-40fe-9e21-683c51fde205"

FETCHSOURCE
Fetching storage object: gs://my-project_cloudbuild/source/1568633246.06-66fdd267ca2f4b9e8ebd1f61365e0b51.tgz#1568633245319762
Copying gs://my-project_cloudbuild/source/1568633246.06-66fdd267ca2f4b9e8ebd1f61365e0b51.tgz#1568633245319762...
/ [0 files][    0.0 B/  800.0 B]                                                
/ [1 files][  800.0 B/  800.0 B]                                                
Operation completed over 1 objects/800.0 B.                                      
BUILD
Already have image (with digest): gcr.io/kaniko-project/executor@sha256:584a8d90679211d9b09465d778990ec15965cf78f57f197e973d57d14b08eb81
INFO[0000] Resolved base name python:3.7.2 to python:3.7.2 
INFO[0000] Resolved base name Library to Library        
INFO[0000] Resolved base name python:3.7.2 to python:3.7.2 
INFO[0000] Resolved base name Library to Library        
INFO[0000] Downloading base image python:3.7.2          
INFO[0001] Error while retrieving image from cache: getting file info: stat /cache/sha256:9db2a731d3c7970453d37f5f92708ffd1255d12a76517fb24f944ca3d4f84f8e: no such file or directory 
INFO[0001] Downloading base image python:3.7.2          
INFO[0002] Error while retrieving image from cache: could not parse reference 
INFO[0002] Downloading base image Library               
error building image: could not parse reference
ERROR
ERROR: build step 0 "gcr.io/kaniko-project/executor@sha256:584a8d90679211d9b09465d778990ec15965cf78f57f197e973d57d14b08eb81" failed: exit status 1
----------------------------------------------------------------------------------------

uppercase.yml

steps:
 - name: gcr.io/kaniko-project/executor@sha256:584a8d90679211d9b09465d778990ec15965cf78f57f197e973d57d14b08eb81
   args:
      - --dockerfile=Dockerfile-uppercase
      - --destination=gcr.io/my-project/kaniko_fail_example_capital # note: change 'your-project' to your google cloud 

Reported as Kaniko issue #770