Azure agents with docker ./start.sh no such file or directory - linux

Question

So I am following the documentation from Microsoft here:
https://learn.microsoft.com/en-us/azure/devops/pipelines/agents/docker?view=azure-devops#add-tools-and-customize-the-container
This is my dockerfile:
FROM ubuntu:20.04
RUN DEBIAN_FRONTEND=noninteractive apt-get update
RUN DEBIAN_FRONTEND=noninteractive apt-get upgrade -y
RUN DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends \
apt-transport-https \
apt-utils \
ca-certificates \
curl \
git \
iputils-ping \
jq \
lsb-release \
software-properties-common
RUN curl -sL https://aka.ms/InstallAzureCLIDeb | bash
# Can be 'linux-x64', 'linux-arm64', 'linux-arm', 'rhel.6-x64'.
ENV TARGETARCH=linux-x64
WORKDIR /azp
COPY ./start.sh .
RUN chmod +x start.sh
ENTRYPOINT [ "./start.sh" ]
This is my start.sh:
#!/bin/bash
set -e
if [ -z "$AZP_URL" ]; then
echo 1>&2 "error: missing AZP_URL environment variable"
exit 1
fi
if [ -z "$AZP_TOKEN_FILE" ]; then
if [ -z "$AZP_TOKEN" ]; then
echo 1>&2 "error: missing AZP_TOKEN environment variable"
exit 1
fi
AZP_TOKEN_FILE=/azp/.token
echo -n $AZP_TOKEN > "$AZP_TOKEN_FILE"
fi
unset AZP_TOKEN
if [ -n "$AZP_WORK" ]; then
mkdir -p "$AZP_WORK"
fi
export AGENT_ALLOW_RUNASROOT="1"
cleanup() {
if [ -e config.sh ]; then
print_header "Cleanup. Removing Azure Pipelines agent..."
# If the agent has some running jobs, the configuration removal process will fail.
# So, give it some time to finish the job.
while true; do
./config.sh remove --unattended --auth PAT --token $(cat "$AZP_TOKEN_FILE") && break
echo "Retrying in 30 seconds..."
sleep 30
done
fi
}
print_header() {
lightcyan='\033[1;36m'
nocolor='\033[0m'
echo -e "${lightcyan}$1${nocolor}"
}
# Let the agent ignore the token env variables
export VSO_AGENT_IGNORE=AZP_TOKEN,AZP_TOKEN_FILE
print_header "1. Determining matching Azure Pipelines agent..."
AZP_AGENT_PACKAGES=$(curl -LsS \
-u user:$(cat "$AZP_TOKEN_FILE") \
-H 'Accept:application/json;' \
"$AZP_URL/_apis/distributedtask/packages/agent?platform=$TARGETARCH&top=1")
AZP_AGENT_PACKAGE_LATEST_URL=$(echo "$AZP_AGENT_PACKAGES" | jq -r '.value[0].downloadUrl')
if [ -z "$AZP_AGENT_PACKAGE_LATEST_URL" -o "$AZP_AGENT_PACKAGE_LATEST_URL" == "null" ]; then
echo 1>&2 "error: could not determine a matching Azure Pipelines agent"
echo 1>&2 "check that account '$AZP_URL' is correct and the token is valid for that account"
exit 1
fi
print_header "2. Downloading and extracting Azure Pipelines agent..."
curl -LsS $AZP_AGENT_PACKAGE_LATEST_URL | tar -xz & wait $!
source ./env.sh
print_header "3. Configuring Azure Pipelines agent..."
./config.sh --unattended \
--agent "${AZP_AGENT_NAME:-$(hostname)}" \
--url "$AZP_URL" \
--auth PAT \
--token $(cat "$AZP_TOKEN_FILE") \
--pool "${AZP_POOL:-Default}" \
--work "${AZP_WORK:-_work}" \
--replace \
--acceptTeeEula & wait $!
print_header "4. Running Azure Pipelines agent..."
trap 'cleanup; exit 0' EXIT
trap 'cleanup; exit 130' INT
trap 'cleanup; exit 143' TERM
chmod +x ./run-docker.sh
# To be aware of TERM and INT signals call run.sh
# Running it with the --once flag at the end will shut down the agent after the build is executed
./run-docker.sh "$#" & wait $!
I can build everything fine and this is what it spits out:
[+] Building 185.9s (13/13) FINISHED
=> [internal] load build definition from Dockerfile 0.1s
=> => transferring dockerfile: 32B 0.0s
=> [internal] load .dockerignore 0.1s
=> => transferring context: 2B 0.0s
=> [internal] load metadata for docker.io/library/ubuntu:20.04 0.6s
=> CACHED [1/8] FROM docker.io/library/ubuntu:20.04#sha256:fd92c36d3cb9b1d027c4d2a72c6bf0125da82425fc2ca37c414d4 0.0s
=> [internal] load build context 0.1s
=> => transferring context: 30B 0.0s
=> [2/8] RUN DEBIAN_FRONTEND=noninteractive apt-get update 10.4s
=> [3/8] RUN DEBIAN_FRONTEND=noninteractive apt-get upgrade -y 8.8s
=> [4/8] RUN DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends apt-transport-ht 53.5s
=> [5/8] RUN curl -sL https://aka.ms/InstallAzureCLIDeb | bash 54.7s
=> [6/8] WORKDIR /azp 0.1s
=> [7/8] COPY ./start.sh . 0.1s
=> [8/8] RUN chmod +x start.sh 0.5s
=> exporting to image 56.8s
=> => exporting layers 56.8s
=> => writing image sha256:fadefaae070c65381941b5a17a063d2248ebaba97c10d8a131dac711f153ae50 0.0s
=> => naming to docker.io/library/dockeragent:latest 0.0s
Use 'docker scan' to run Snyk tests against images to find vulnerabilities and learn how to fix them
But when I go to run the image with
docker run -e AZP_URL=https://myazureurl -e AZP_TOKEN=myTokenIGenerated -e AZP_POOL=myAgentPool -e AZP_AGENT_NAME=myAgentName dockeragent:latest
I get this error:
exec ./start.sh: no such file or directory
But start.sh is in the same folder as my dockerfile

Answer 1

I found out the issue was that when making the start.sh file in windows it creates a CRLF line ending file. Linux uses LF, so to convert it just open the file up in notepad ++ and rightclick the bottom right where you see windows CRLF and swap it to Linux LF