Add new UDC to perform an optimized git deep clone

Earthfile

@@ -11,8 +11,11 @@ install-dind-script:
     SAVE ARTIFACT ./install-dind.sh
 
 test:
+    FROM alpine:3.18
     BUILD +test-install-dind-amd64
-    BUILD ./ssh+test-add-known-hosts
+    FOR dir IN "ssh git"
+        BUILD ./$dir+test
+    END
 
 test-install-dind-amd64:
     BUILD --platform=linux/amd64 +test-install-dind-for-image \

git/Earthfile

@@ -0,0 +1,32 @@
+VERSION --arg-scope-and-set 0.7
+
+# DEEP_CLONE deep clones the provided git url
+DEEP_CLONE:
+    COMMAND
+    ARG USE_GIT_ENV="false"
+    IF [ $USE_GIT_ENV = "true" ]
+        FROM alpine/git:v2.40.1
+    END
+    DO ../ssh+ADD_KNOWN_HOSTS
+    ARG --required GIT_URL
+    ARG DEST_DIR
+    LET dest_dir=$DEST_DIR
+    IF [ -z $dest_dir ]
+        SET dest_dir=$(basename ${GIT_URL%.git})
+    END
+    GIT CLONE $GIT_URL $dest_dir
+    WORKDIR $dest_dir
+    RUN git remote set-url origin $GIT_URL
+    ARG git_hash=$(git rev-parse HEAD)
+    ARG SECRET_PATH
+    IF [ -z $SECRET_PATH ]
+        RUN echo secrets path is z
+        RUN --ssh git fetch --unshallow
+    ELSE
+        RUN echo secrets path is NOT z
+        RUN --mount=type=secret,id=$SECRET_PATH,mode=0400,target=/root/.ssh/id_rsa \
+            git fetch --unshallow
+    END
+
+test:
+    BUILD ./tests+all

git/tests/Earthfile

@@ -0,0 +1,48 @@
+VERSION --arg-scope-and-set --pass-args 0.7
+
+PROJECT earthly-technologies/core
+
+all:
+    BUILD --platform=linux/amd64 --platform=linux/arm64 +test-deep-clone-image \
+        --base_image=alpine/git:latest \
+        --base_image=alpine:latest \
+        --base_image=debian:stable \
+        --base_image=debian:stable-slim \
+        --base_image=ubuntu:latest \
+        --base_image=amazonlinux:1 \
+        --base_image=amazonlinux:2 \
+        --GIT_URL=https://github.com/earthly/lib.git \
+        [email protected]:earthly/cloud.git \
+        [email protected]:earthly/cloud \
+        --SECRET_PATH="" \
+        --SECRET_PATH="littleredcorvette-id_rsa" \
+        --DEST_DIR="" \
+        --DEST_DIR="some-other-dir"
+
+test-deep-clone-image:
+    ARG --required base_image
+    ARG TARGETPLATFORM
+    FROM alpine
+    IF [ "$base_image" = "amazonlinux:1" ] && [ "$TARGETPLATFORM" = "linux/arm64" ] # no amazonlinux:1 for arm64, skipping
+        RUN echo skipping $base_image with platform $TARGETPLATFORM
+    ELSE
+        FROM "$base_image"
+        LET use_git_env="true"
+        IF [ "${base_image%:*}" = "alpine/git" ]
+            SET use_git_env="false"
+            RUN apk add git
+        ELSE IF [ "${base_image%:*}" = "alpine" ]
+            RUN apk add git
+        ELSE IF [ "${base_image%:*}" = "debian" ]
+            RUN apt update && apt install -y git
+        ELSE IF [ "${base_image%:*}" = "ubuntu" ]
+            RUN apt-get update && apt-get -y install git
+        ELSE IF [[ $base_image == amazonlinux* ]]
+            RUN yum -y install git
+        END
+        DO --pass-args ..+DEEP_CLONE --USE_GIT_ENV=$use_git_env
+        IF [ -n $DEST_DIR ]
+            WORKDIR $DEST_DIR
+        END
+        RUN git checkout main
+    END

ssh/Earthfile

@@ -1,6 +1,6 @@
-VERSION --pass-args --arg-scope-and-set 0.7
+VERSION 0.7
 
-# ADD_KNOWN_HOSTS will append some known public keys into the $target_file
+# ADD_KNOWN_HOSTS appends some known public keys into the $target_file
 ADD_KNOWN_HOSTS:
     COMMAND
     ARG target_file=~/.ssh/known_hosts
@@ -11,47 +11,9 @@ ADD_KNOWN_HOSTS:
 
 # known-hosts is used to copy the known_hosts file into the build context (internal use)
 known-hosts:
-    FROM alpine
+    FROM alpine:3.18.4
     COPY known_hosts .
     SAVE ARTIFACT known_hosts
 
-#######################
-# Tests:
-#######################
-
-test-add-known-hosts:
-    BUILD --platform=linux/amd64 +test-add-known-hosts-image \
-        --base_image=alpine:latest \
-        --base_image=debian:stable \
-        --base_image=debian:stable-slim \
-        --base_image=ubuntu:latest \
-        --base_image=amazonlinux:1 \
-        --base_image=amazonlinux:2 \
-        --target_file=~/to_interpolate/known_hosts \
-        --target_file=no_dir_new_known_hosts \
-        --target_file=/some/dir/to/file/new_known_hosts \
-        --target_file=existing_known_hosts # this will be handled in the test target
-
-test-add-known-hosts-image:
-    ARG --required base_image
-    ARG TARGETPLATFORM
-    FROM alpine
-    IF [ "$base_image" = "amazonlinux:1" ] && [ "$TARGETPLATFORM" = "linux/arm64" ] # no amazonlinux:1 for arm64, skipping
-        RUN echo skipping $base_image with platform $TARGETPLATFORM
-    ELSE
-        FROM "$base_image"
-        IF [ "$base_image" = "amazonlinux:1" ]
-            RUN yum -y install diffutils.x86_64
-        END
-        COPY ./known_hosts /tmp/expected-temp
-        RUN test -s /tmp/expected-temp
-        ARG target_file
-        IF [ "$target_file" = "existing_known_hosts" ]
-            RUN echo some-key >> /tmp/expected
-            RUN echo some-key >> $target_file
-        END
-        RUN cat /tmp/expected-temp >> /tmp/expected
-        DO --pass-args +ADD_KNOWN_HOSTS
-        LET expanded_target_file="$(eval echo $target_file)"
-        RUN diff /tmp/expected $(eval echo $expanded_target_file)
-    END
+test:
+    BUILD ./tests+all

ssh/tests/Earthfile

@@ -0,0 +1,38 @@
+VERSION --pass-args --arg-scope-and-set 0.7
+
+all:
+    BUILD --platform=linux/amd64 --platform=linux/arm64 +test-add-known-hosts-image \
+        --base_image=alpine:latest \
+        --base_image=debian:stable \
+        --base_image=debian:stable-slim \
+        --base_image=ubuntu:latest \
+        --base_image=amazonlinux:1 \
+        --base_image=amazonlinux:2 \
+        --target_file=~/to_interpolate/known_hosts \
+        --target_file=no_dir_new_known_hosts \
+        --target_file=/some/dir/to/file/new_known_hosts \
+        --target_file=existing_known_hosts # this will be handled in the test target
+
+test-add-known-hosts-image:
+    ARG --required base_image
+    ARG TARGETPLATFORM
+    FROM alpine
+    IF [ "$base_image" = "amazonlinux:1" ] && [ "$TARGETPLATFORM" = "linux/arm64" ] # no amazonlinux:1 for arm64, skipping
+        RUN echo skipping $base_image with platform $TARGETPLATFORM
+    ELSE
+        FROM "$base_image"
+        IF [ "$base_image" = "amazonlinux:1" ]
+            RUN yum -y install diffutils.x86_64
+        END
+        COPY ..+known-hosts/known_hosts /tmp/expected-temp
+        RUN test -s /tmp/expected-temp
+        ARG target_file
+        IF [ "$target_file" = "existing_known_hosts" ]
+            RUN echo some-key >> /tmp/expected
+            RUN echo some-key >> $target_file
+        END
+        RUN cat /tmp/expected-temp >> /tmp/expected
+        DO --pass-args ..+ADD_KNOWN_HOSTS
+        LET expanded_target_file="$(eval echo $target_file)"
+        RUN diff /tmp/expected $(eval echo $expanded_target_file)
+    END