spack · alalazo · Jun 17, 2026 · Jun 17, 2026 · Jun 17, 2026
diff --git a/container/buildcache.dockerfile b/container/buildcache.dockerfile
@@ -0,0 +1,67 @@
+# Multi-stage variant of ./Dockerfile.
+#
+# Instead of pulling a prebuilt buildcache, this builds the buildcache
+# locally from container/spack.yaml in a "builder" stage, then copies
+# it into the tutorial image. Use it to try out new specs: edit
+# container/spack.yaml and rebuild.
+#
+#   docker build -f container/buildcache.dockerfile -t tutorial:experimental container
+#
+
+# ---- stage 1: build the buildcache ----
+FROM ghcr.io/spack/tutorial-ubuntu-26.04:v2026-06-09 AS builder
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV SPACK_ROOT=/spack/spack
+ENV PATH=$SPACK_ROOT/bin:$PATH
+ENV SPACK_COMMIT=63943396d634faa92cb59474df3558ec9b9b2425
+ENV SPACK_PACKAGES_COMMIT=688a7045fbcaea7b4965ac51e266408a0b591b9d
+
+# Base image has no spack, so clone it and pin to a specific commit.
+RUN git clone --depth 1 https://github.com/spack/spack.git $SPACK_ROOT && \
+    git -C $SPACK_ROOT fetch --depth 1 origin $SPACK_COMMIT && \
+    git -C $SPACK_ROOT checkout $SPACK_COMMIT
+
+# Pin the builtin package repository to a specific commit.
+RUN spack repo update builtin --commit $SPACK_PACKAGES_COMMIT
+
+COPY spack.yaml /opt/spack-environment/spack.yaml
+
+RUN --mount=type=cache,target=/home/software/spack \
+    spack -e /opt/spack-environment concretize -f && \
+    spack -e /opt/spack-environment install --fail-fast
+
+RUN --mount=type=cache,target=/home/software/spack \
+    spack -e /opt/spack-environment buildcache push --unsigned --update-index /mirror && \
+    chmod -R go+r /mirror
+
+# ---- stage 2: the tutorial image ----
+FROM ghcr.io/spack/tutorial-ubuntu-26.04:v2026-06-09
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Same tooling as ./Dockerfile, minus rclone (no longer needed).
+RUN apt-get update -y && \
+    apt-get install -y --no-install-recommends \
+    bash-completion \
+    ca-certificates \
+    emacs \
+    jq \
+    less \
+    vim
+
+# Bring in the buildcache produced by the builder stage.
+COPY --from=builder /mirror /mirror
+
+COPY packages.yaml /etc/spack/packages.yaml
+COPY config.yaml /etc/spack/config.yaml
+COPY concretizer.yaml /etc/spack/concretizer.yaml
+
+RUN useradd -ms /bin/bash spack && \
+    chmod -R go+r /etc/spack
+
+USER spack
+
+WORKDIR /home/spack
+
+ENTRYPOINT [ "bash" ]
diff --git a/container/spack.yaml b/container/spack.yaml
@@ -0,0 +1,80 @@
+spack:
+  view: false
+
+  packages:
+    all:
+      require:
+      - target=x86_64_v3
+    tbb:
+      require: intel-tbb
+
+  specs:
+  - group: compiler
+    specs:
+    - gcc@16 build_type=Release +profiled +strip
+
+  - group: "gcc@15 specs"
+    specs:
+    - zlib-ng@2.2.4
+    - zlib-ng@2.0.7
+    - zlib-ng +ipo
+    - zlib-ng build_type=Debug
+    - zlib-ng %clang
+    - tcl ^zlib-ng@2.2.4
+    - tcl ^zlib-ng@2.0.7 %clang
+    - tcl ^zlib-ng %gcc@14
+    - hdf5+mpi^openmpi
+    - hdf5~mpi
+    - hdf5+hl+mpi ^mpich
+    - trilinos ^openmpi
+    - trilinos +hdf5 ^hdf5+hl+mpi ^mpich
+    - mpileaks
+    - lmod@8.7.67
+    - environment-modules
+    - macsio@1.1+scr ^scr@2.0.0~fortran ^silo~fortran ^hdf5~fortran
+    - julia ^llvm ~clang ~gold ~lldb ~lua ~polly compiler-rt=none libcxx=none libunwind=none targets=x86 ^openblas threads=openmp
+    - vim
+    override:
+      packages:
+        c:
+          prefer: [gcc@15]
+        cxx:
+          prefer: [gcc@15]
+        fortran:
+          prefer: [gcc@15]
+
+  - group: scalapacks
+    needs: [compiler]
+    specs:
+    - matrix:
+      - [netlib-scalapack]
+      - [^mpich, ^openmpi]
+      - [^openblas, ^netlib-lapack]
+    - matrix:
+      - [py-scipy ^openblas, armadillo ^openblas, netlib-lapack, openmpi, mpich, elpa ^mpich]
+    override:
+      packages:
+        c:
+          prefer: [gcc@16]
+        cxx:
+          prefer: [gcc@16]
+        fortran:
+          prefer: [gcc@16]
+
+  concretizer:
+    unify: false
+    reuse: false
+    targets:
+      granularity: generic
+
+  config:
+    installer: new
+    misc_cache: "$user_cache_path/cache"
+    db_lock_timeout: 120
+    shared_linking:
+      missing_library_policy: warn
+    install_tree:
+      root: /home/software/spack
+      padded_length: 256
+      projections:
+        all: "{architecture.platform}-{architecture.target}/{name}-{version}-{hash}"
diff --git a/outputs/basics/clone.out b/outputs/basics/clone.out
@@ -1,9 +1,9 @@
 $ git clone --depth=2 --branch=releases/v1.1 https://github.com/spack/spack.git ~/spack
 Cloning into '/home/spack/spack'...
-remote: Enumerating objects: 2340, done.K
-remote: Counting objects: 100% (2340/2340), done.K
-remote: Compressing objects: 100% (1583/1583), done.K
-remote:nTotale2340 (delta2311),3reused 1329 (delta 237), pack-reused 0 (from 0)K
-Receiving objects: 100% (2340/2340), 5.30 MiB | 20.25 MiB/s, done.
-Resolving deltas: 100% (311/311), done.
+remote: Enumerating objects: 2343, done.K
+remote: Counting objects: 100% (2343/2343), done.K
+remote: Compressing objects: 100% (1589/1589), done.K
+remote:nTotale2343 (delta2309),3reused 1265 (delta 234), pack-reused 0 (from 0)K
+Receiving objects: 100% (2343/2343), 5.32 MiB | 18.72 MiB/s, done.
+Resolving deltas: 100% (309/309), done.
 $ cd ~/spack
diff --git a/outputs/basics/find-ldf-2.out b/outputs/basics/find-ldf-2.out
@@ -1,8 +1,8 @@
 $ spack find -ldf
 -- linux-ubuntu22.04-x86_64 / no compilers ----------------------
-rpw3buk gcc@11.4.0
+4xgkopt gcc@11.4.0
 
-vjnqll7 glibc@2.35
+jfjsr3p glibc@2.35
 
 
 -- linux-ubuntu22.04-x86_64_v3 / %c,cxx,fortran=gcc@11.4.0 ------
@@ -637,11 +637,11 @@ c6d2zlj	    readline@8.3
 ncdxq3j		ncurses@6.5-20250705
 f4qiprw		    pkgconf@2.5.1
 
-vsq3oi3 gmake@4.4.1
+ikkzcak gmake@4.4.1
 ntccuj2	    compiler-wrapper@1.0
-rpw3buk	    gcc@11.4.0
-qmbrryi	    gcc-runtime@11.4.0
-vjnqll7	    glibc@2.35
+4xgkopt	    gcc@11.4.0
+dr7kup4	    gcc-runtime@11.4.0
+jfjsr3p	    glibc@2.35
 
 4obn7cg gmake@4.4.1
 ntccuj2	    compiler-wrapper@1.0
@@ -1240,9 +1240,9 @@ ahapkrs gcc-runtime@10.5.0
 ntkvysy	    gcc@10.5.0
 qg7qyaz	    glibc@2.35
 
-qmbrryi gcc-runtime@11.4.0
-rpw3buk	    gcc@11.4.0
-vjnqll7	    glibc@2.35
+dr7kup4 gcc-runtime@11.4.0
+4xgkopt	    gcc@11.4.0
+jfjsr3p	    glibc@2.35
 
 nokfxva gcc-runtime@11.4.0
 ml7cem5	    gcc@11.4.0

diff --git a/outputs/basics/find-ldf.out b/outputs/basics/find-ldf.out
@@ -1,8 +1,8 @@
 $ spack find -ldf
 -- linux-ubuntu22.04-x86_64 / no compilers ----------------------
-rpw3buk gcc@11.4.0
+4xgkopt gcc@11.4.0
 
-vjnqll7 glibc@2.35
+jfjsr3p glibc@2.35
 
 
 -- linux-ubuntu22.04-x86_64_v3 / %c,cxx=clang@14.0.0 ------------
@@ -82,11 +82,11 @@ qg7qyaz	    glibc@2.35
 
 
 -- linux-ubuntu22.04-x86_64_v3 / %c=gcc@11.4.0 ------------------
-vsq3oi3 gmake@4.4.1
+ikkzcak gmake@4.4.1
 ntccuj2	    compiler-wrapper@1.0
-rpw3buk	    gcc@11.4.0
-qmbrryi	    gcc-runtime@11.4.0
-vjnqll7	    glibc@2.35
+4xgkopt	    gcc@11.4.0
+dr7kup4	    gcc-runtime@11.4.0
+jfjsr3p	    glibc@2.35
 
 4obn7cg gmake@4.4.1
 ntccuj2	    compiler-wrapper@1.0
@@ -106,9 +106,9 @@ ahapkrs gcc-runtime@10.5.0
 ntkvysy	    gcc@10.5.0
 qg7qyaz	    glibc@2.35
 
-qmbrryi gcc-runtime@11.4.0
-rpw3buk	    gcc@11.4.0
-vjnqll7	    glibc@2.35
+dr7kup4 gcc-runtime@11.4.0
+4xgkopt	    gcc@11.4.0
+jfjsr3p	    glibc@2.35
 
 nokfxva gcc-runtime@11.4.0
 ml7cem5	    gcc@11.4.0

diff --git a/outputs/basics/find-lf.out b/outputs/basics/find-lf.out
@@ -1,6 +1,6 @@
 $ spack find -lf
 -- linux-ubuntu22.04-x86_64 / no compilers ----------------------
-rpw3buk gcc@11.4.0  vjnqll7 glibc@2.35
+4xgkopt gcc@11.4.0  jfjsr3p glibc@2.35
 
 -- linux-ubuntu22.04-x86_64_v3 / %c,cxx=clang@14.0.0 ------------
 um7p6tr zlib-ng@2.0.7  ct2r7xm zlib-ng@2.2.4
@@ -15,10 +15,10 @@ qlavhjb zlib-ng@2.0.7  cflags=-O3
 ufbescp gmake@4.4.1
 
 -- linux-ubuntu22.04-x86_64_v3 / %c=gcc@11.4.0 ------------------
-vsq3oi3 gmake@4.4.1  4obn7cg gmake@4.4.1
+ikkzcak gmake@4.4.1  4obn7cg gmake@4.4.1
 
 -- linux-ubuntu22.04-x86_64_v3 / no compilers -------------------
 ntccuj2 compiler-wrapper@1.0  ahapkrs gcc-runtime@10.5.0  qg7qyaz glibc@2.35
-ntkvysy gcc@10.5.0	      qmbrryi gcc-runtime@11.4.0  qr2e4rd llvm@14.0.0
+ntkvysy gcc@10.5.0	      dr7kup4 gcc-runtime@11.4.0  qr2e4rd llvm@14.0.0
 ml7cem5 gcc@11.4.0	      nokfxva gcc-runtime@11.4.0
 ==> 17 installed packages
diff --git a/outputs/basics/find-px.out b/outputs/basics/find-px.out
@@ -11,7 +11,7 @@ tcl@8.6.17     /home/spack/spack/opt/spack/linux-x86_64_v3/tcl-8.6.17-tsq4fjjw2p
 zlib-ng@2.0.7  /home/spack/spack/opt/spack/linux-x86_64_v3/zlib-ng-2.0.7-qlavhjbsgqyboovfvsultjdwzz5nvthw
 
 -- linux-ubuntu22.04-x86_64_v3 / %c=gcc@11.4.0 ------------------
-gmake@4.4.1  /home/spack/spack/opt/spack/linux-x86_64_v3/gmake-4.4.1-vsq3oi374trwzuwcxzutihi2zbxrhosh
+gmake@4.4.1  /home/spack/spack/opt/spack/linux-x86_64_v3/gmake-4.4.1-ikkzcakbjrn76u5l3eavzliyjhrdvagn
 hdf5@1.14.6  /home/spack/spack/opt/spack/linux-x86_64_v3/hdf5-1.14.6-7mm6knnnjxquabuuhme4sjpe6d6vfawh
 hdf5@1.14.6  /home/spack/spack/opt/spack/linux-x86_64_v3/hdf5-1.14.6-vllfzb7aaz52qw5k2rkqq64glpglw5gv
 hdf5@1.14.6  /home/spack/spack/opt/spack/linux-x86_64_v3/hdf5-1.14.6-gdk3ghc3gh5rpxoztushxjuvto5prlqd

diff --git a/outputs/basics/gmake.out b/outputs/basics/gmake.out
@@ -1,29 +1,29 @@
 $ spack install gmake
 ==> Compilers have been configured automatically from PATH inspection
-[+] /usr (external gcc-11.4.0-rpw3bukiasa3mhgh2vbz6tlwb5smfg3w)
-[+] /usr (external glibc-2.35-vjnqll7uhrmsms4z5opdvczk7riv6fs5)
+[+] /usr (external gcc-11.4.0-4xgkoptcicxn25t4t6n3zp4ujbdn7pgo)
+[+] /usr (external glibc-2.35-jfjsr3pnnii2tcvxku73bl5apu6jxfct)
 ==> No binary for compiler-wrapper-1.0-ntccuj2fi3y7asqifeq3i4iylrbxakw2 found: installing from source
 ==> Installing compiler-wrapper-1.0-ntccuj2fi3y7asqifeq3i4iylrbxakw2 [3/5]
 ==> Fetching https://mirror.spack.io/_source-cache/archive/a5/a5ff4fcdbeda284a7993b87f294b6338434cffc84ced31e4d04008ed5ea389bf
-    [100%]   30.08 KB @	 185.8 MB/s
+    [100%]   30.08 KB @	  57.3 MB/s
 ==> No patches needed for compiler-wrapper
 ==> compiler-wrapper: Executing phase: 'install'
 ==> compiler-wrapper: Successfully installed compiler-wrapper-1.0-ntccuj2fi3y7asqifeq3i4iylrbxakw2
-  Stage: 0.15s.	 Install: 0.01s.  Post-install: 0.01s.	Total: 0.18s
+  Stage: 0.09s.	 Install: 0.00s.  Post-install: 0.01s.	Total: 0.13s
 [+] /home/spack/spack/opt/spack/linux-x86_64_v3/compiler-wrapper-1.0-ntccuj2fi3y7asqifeq3i4iylrbxakw2
-==> No binary for gcc-runtime-11.4.0-qmbrryiepg5ww5i2bujmli7i22dmwqju found: installing from source
-==> Installing gcc-runtime-11.4.0-qmbrryiepg5ww5i2bujmli7i22dmwqju [4/5]
+==> No binary for gcc-runtime-11.4.0-dr7kup45zat5rlc3hfgnyu2xliolb5v5 found: installing from source
+==> Installing gcc-runtime-11.4.0-dr7kup45zat5rlc3hfgnyu2xliolb5v5 [4/5]
 ==> No patches needed for gcc-runtime
 ==> gcc-runtime: Executing phase: 'install'
-==> gcc-runtime: Successfully installed gcc-runtime-11.4.0-qmbrryiepg5ww5i2bujmli7i22dmwqju
-  Stage: 0.00s.	 Install: 0.05s.  Post-install: 0.03s.	Total: 0.09s
-[+] /home/spack/spack/opt/spack/linux-x86_64_v3/gcc-runtime-11.4.0-qmbrryiepg5ww5i2bujmli7i22dmwqju
-==> No binary for gmake-4.4.1-vsq3oi374trwzuwcxzutihi2zbxrhosh found: installing from source
-==> Installing gmake-4.4.1-vsq3oi374trwzuwcxzutihi2zbxrhosh [5/5]
+==> gcc-runtime: Successfully installed gcc-runtime-11.4.0-dr7kup45zat5rlc3hfgnyu2xliolb5v5
+  Stage: 0.00s.	 Install: 0.04s.  Post-install: 0.03s.	Total: 0.09s
+[+] /home/spack/spack/opt/spack/linux-x86_64_v3/gcc-runtime-11.4.0-dr7kup45zat5rlc3hfgnyu2xliolb5v5
+==> No binary for gmake-4.4.1-ikkzcakbjrn76u5l3eavzliyjhrdvagn found: installing from source
+==> Installing gmake-4.4.1-ikkzcakbjrn76u5l3eavzliyjhrdvagn [5/5]
 ==> Fetching https://mirror.spack.io/_source-cache/archive/dd/dd16fb1d67bfab79a72f5e8390735c49e3e8e70b4945a15ab1f81ddb78658fb3.tar.gz
-    [100%]   62.35 MB @	 163.0 MB/s
+    [100%]   62.35 MB @	 113.1 MB/s
 ==> No patches needed for gmake
 ==> gmake: Executing phase: 'install'
-==> gmake: Successfully installed gmake-4.4.1-vsq3oi374trwzuwcxzutihi2zbxrhosh
-  Stage: 0.24s.	 Install: 10.47s.  Post-install: 0.01s.	 Total: 10.73s
-[+] /home/spack/spack/opt/spack/linux-x86_64_v3/gmake-4.4.1-vsq3oi374trwzuwcxzutihi2zbxrhosh
+==> gmake: Successfully installed gmake-4.4.1-ikkzcakbjrn76u5l3eavzliyjhrdvagn
+  Stage: 0.19s.	 Install: 10.48s.  Post-install: 0.01s.	 Total: 10.70s
+[+] /home/spack/spack/opt/spack/linux-x86_64_v3/gmake-4.4.1-ikkzcakbjrn76u5l3eavzliyjhrdvagn