fix post_easyblock_hook_copy_easybuild_subdir: check that easybuild subdirectory exists before trying to copy it to reprod directory

[boegel]

This avoids a confusing "Failed to copy directory" error message when an installation failed because downloading of source files files, for example:

== 2026-07-30 13:31:38,659 build_log.py:233 ERROR EasyBuild encountered an error: Failed to copy directory /cvmfs/software.eessi.io/versions/2025.06/software/linux/x86_64/amd/zen5/software/nettle/3.10.1-GCCcore-14.2.0/easybuild to /cvmfs/s
oftware.eessi.io/versions/2025.06/software/linux/x86_64/amd/zen5/reprod/nettle/3.10.1-GCCcore-14.2.0/20260730_133138UTC/easybuild: [Errno 2] No such file or directory: '/cvmfs/software.eessi.io/versions/2025.06/software/linux/x86_64/amd/ze
n5/software/nettle/3.10.1-GCCcore-14.2.0/easybuild' (at easybuild/tools/filetools.py:2738 in copy_dir)
Callstack:
        easybuild/tools/filetools.py:2738 in copy_dir
        easybuild/eb_hooks.py:964 in post_easyblock_hook_copy_easybuild_subdir
        easybuild/eb_hooks.py:2199 in post_easyblock_hook
        easybuild/tools/hooks.py:252 in run_hook
        easybuild/framework/easyblock.py:5365 in build_and_install_one
        easybuild/main.py:184 in build_and_install_software
        easybuild/main.py:630 in process_eb_args
        easybuild/main.py:337 in process_easystack
        easybuild/main.py:812 in main
        easybuild/main.py:872 in main_with_hooks
        easybuild/main.py:891 in <module>

While the actual problem (higher up in the log) is a download failure:

== 2026-07-30 14:13:03,592 build_log.py:233 ERROR EasyBuild encountered an error: Couldn't find file nettle-3.10.1.tar.gz anywhere, and downloading it didn't work either...

[bedroge]

bot: build repo:eessi.io-2023.06-software instance:eessi-bot-mc-aws for:arch=x86_64/amd/zen2
bot: build repo:eessi.io-2025.06-software instance:eessi-bot-mc-aws for:arch=x86_64/amd/zen2

[eessi-bot-aws]

New job on instance eessi-bot-mc-aws for repository eessi.io-2023.06-software
Building on: amd-zen2
Building for: x86_64/amd/zen2
Job dir: /project/def-users/SHARED/jobs/2026.07/pr_276/181662

date	job status	comment
Jul 30 15:32:04 UTC 2026	submitted	job id 181662 awaits release by job manager
Jul 30 15:32:28 UTC 2026	released	job awaits launch by Slurm scheduler
Jul 30 15:38:01 UTC 2026	running	job 181662 is running
Jul 30 15:48:00 UTC 2026	finished	😁 SUCCESS (click triangle for details) Details ✅ job output file slurm-181662.out ✅ no message matching FATAL: ✅ no message matching ERROR: ✅ no message matching FAILED: ✅ no message matching required modules missing: ✅ found message(s) matching No missing installations ✅ found message matching .tar.* created! Artefacts eessi-2023.06-software-linux-x86_64-amd-zen2-17854260650.tar.zst size: 0 MiB (31411 bytes) entries: 1 modules under 2023.06/software/linux/x86_64/amd/zen2/modules/all no module files in tarball software under 2023.06/software/linux/x86_64/amd/zen2/software no software packages in tarball reprod directories under 2023.06/software/linux/x86_64/amd/zen2/reprod no reprod directories in tarball other under 2023.06/software/linux/x86_64/amd/zen2 no other files in tarball
Jul 30 15:48:00 UTC 2026	test result	😁 SUCCESS (click triangle for details) ReFrame Summary [ OK ] ( 1/10) EESSI_LAMMPS_lj %device_type=cpu %module_name=LAMMPS/29Aug2024-foss-2023b-kokkos %scale=1_node /aeb2d9df @BotBuildTests:x86-64-zen2+default P: perf: 440.762 timesteps/s (r:0, l:None, u:None) [ OK ] ( 2/10) EESSI_LAMMPS_lj %device_type=cpu %module_name=LAMMPS/2Aug2023_update2-foss-2023a-kokkos %scale=1_node /04ff9ece @BotBuildTests:x86-64-zen2+default P: perf: 455.857 timesteps/s (r:0, l:None, u:None) [ OK ] ( 3/10) EESSI_OSU_coll %benchmark_info=mpi.collective.osu_allreduce %module_name=OSU-Micro-Benchmarks/7.2-gompi-2023b %scale=1_node %device_type=cpu /775175bf @BotBuildTests:x86-64-zen2+default P: latency: 3.29 us (r:0, l:None, u:None) [ OK ] ( 4/10) EESSI_OSU_coll %benchmark_info=mpi.collective.osu_allreduce %module_name=OSU-Micro-Benchmarks/7.1-1-gompi-2023a %scale=1_node %device_type=cpu /52707c40 @BotBuildTests:x86-64-zen2+default P: latency: 2.86 us (r:0, l:None, u:None) [ OK ] ( 5/10) EESSI_OSU_coll %benchmark_info=mpi.collective.osu_alltoall %module_name=OSU-Micro-Benchmarks/7.2-gompi-2023b %scale=1_node %device_type=cpu /b1aacda9 @BotBuildTests:x86-64-zen2+default P: latency: 5.69 us (r:0, l:None, u:None) [ OK ] ( 6/10) EESSI_OSU_coll %benchmark_info=mpi.collective.osu_alltoall %module_name=OSU-Micro-Benchmarks/7.1-1-gompi-2023a %scale=1_node %device_type=cpu /c6bad193 @BotBuildTests:x86-64-zen2+default P: latency: 5.83 us (r:0, l:None, u:None) [ OK ] ( 7/10) EESSI_OSU_pt2pt_CPU %benchmark_info=mpi.pt2pt.osu_latency %module_name=OSU-Micro-Benchmarks/7.2-gompi-2023b %scale=1_node /15cad6c4 @BotBuildTests:x86-64-zen2+default P: latency: 0.73 us (r:0, l:None, u:None) [ OK ] ( 8/10) EESSI_OSU_pt2pt_CPU %benchmark_info=mpi.pt2pt.osu_latency %module_name=OSU-Micro-Benchmarks/7.1-1-gompi-2023a %scale=1_node /6672deda @BotBuildTests:x86-64-zen2+default P: latency: 0.9 us (r:0, l:None, u:None) [ OK ] ( 9/10) EESSI_OSU_pt2pt_CPU %benchmark_info=mpi.pt2pt.osu_bw %module_name=OSU-Micro-Benchmarks/7.2-gompi-2023b %scale=1_node /2a9a47b1 @BotBuildTests:x86-64-zen2+default P: bandwidth: 6454.22 MB/s (r:0, l:None, u:None) [ OK ] (10/10) EESSI_OSU_pt2pt_CPU %benchmark_info=mpi.pt2pt.osu_bw %module_name=OSU-Micro-Benchmarks/7.1-1-gompi-2023a %scale=1_node /1b24ab8e @BotBuildTests:x86-64-zen2+default P: bandwidth: 6475.86 MB/s (r:0, l:None, u:None) [ PASSED ] Ran 10/10 test case(s) from 10 check(s) (0 failure(s), 0 skipped, 0 aborted) Details ✅ job output file slurm-181662.out ✅ no message matching ERROR: ✅ no message matching [\s*FAILED\s*].*Ran .* test case
Jul 30 16:09:42 UTC 2026	uploaded	transfer of eessi-2023.06-software-linux-x86_64-amd-zen2-17854260650.tar.zst to S3 bucket succeeded

[eessi-bot-aws]

New job on instance eessi-bot-mc-aws for repository eessi.io-2025.06-software
Building on: amd-zen2
Building for: x86_64/amd/zen2
Job dir: /project/def-users/SHARED/jobs/2026.07/pr_276/181663

date	job status	comment
Jul 30 15:32:10 UTC 2026	submitted	job id 181663 awaits release by job manager
Jul 30 15:32:25 UTC 2026	released	job awaits launch by Slurm scheduler
Jul 30 15:33:36 UTC 2026	running	job 181663 is running
Jul 30 15:35:51 UTC 2026	finished	😁 SUCCESS (click triangle for details) Details ✅ job output file slurm-181663.out ✅ no message matching FATAL: ✅ no message matching ERROR: ✅ no message matching FAILED: ✅ no message matching required modules missing: ✅ found message(s) matching No missing installations ✅ found message matching .tar.* created! Artefacts eessi-2025.06-software-linux-x86_64-amd-zen2-17854255800.tar.zst size: 0 MiB (31414 bytes) entries: 1 modules under 2025.06/software/linux/x86_64/amd/zen2/modules/all no module files in tarball software under 2025.06/software/linux/x86_64/amd/zen2/software no software packages in tarball reprod directories under 2025.06/software/linux/x86_64/amd/zen2/reprod no reprod directories in tarball other under 2025.06/software/linux/x86_64/amd/zen2 no other files in tarball
Jul 30 15:35:51 UTC 2026	test result	😁 SUCCESS (click triangle for details) ReFrame Summary [ OK ] (1/6) EESSI_LAMMPS_lj %device_type=cpu %module_name=LAMMPS/22Jul2025-foss-2024a-kokkos %scale=1_node /ade8cad7 @BotBuildTests:x86-64-zen2+default P: perf: 435.496 timesteps/s (r:0, l:None, u:None) [ OK ] (2/6) EESSI_LAMMPS_lj %device_type=cpu %module_name=LAMMPS/22Jul2025_update4-foss-2025b-kokkos %scale=1_node /e121eb9c @BotBuildTests:x86-64-zen2+default P: perf: 443.576 timesteps/s (r:0, l:None, u:None) [ OK ] (3/6) EESSI_OSU_coll %benchmark_info=mpi.collective.osu_allreduce %module_name=OSU-Micro-Benchmarks/7.5-gompi-2025a %scale=1_node %device_type=cpu /e4bf9965 @BotBuildTests:x86-64-zen2+default P: latency: 1.36 us (r:0, l:None, u:None) [ OK ] (4/6) EESSI_OSU_coll %benchmark_info=mpi.collective.osu_alltoall %module_name=OSU-Micro-Benchmarks/7.5-gompi-2025a %scale=1_node %device_type=cpu /3da4890b @BotBuildTests:x86-64-zen2+default P: latency: 2.06 us (r:0, l:None, u:None) [ OK ] (5/6) EESSI_OSU_pt2pt_CPU %benchmark_info=mpi.pt2pt.osu_latency %module_name=OSU-Micro-Benchmarks/7.5-gompi-2025a %scale=1_node /3255009a @BotBuildTests:x86-64-zen2+default P: latency: 0.17 us (r:0, l:None, u:None) [ OK ] (6/6) EESSI_OSU_pt2pt_CPU %benchmark_info=mpi.pt2pt.osu_bw %module_name=OSU-Micro-Benchmarks/7.5-gompi-2025a %scale=1_node /59f4b331 @BotBuildTests:x86-64-zen2+default P: bandwidth: 7796.25 MB/s (r:0, l:None, u:None) [ PASSED ] Ran 6/6 test case(s) from 6 check(s) (0 failure(s), 0 skipped, 0 aborted) Details ✅ job output file slurm-181663.out ✅ no message matching ERROR: ✅ no message matching [\s*FAILED\s*].*Ran .* test case
Jul 30 16:09:51 UTC 2026	uploaded	transfer of eessi-2025.06-software-linux-x86_64-amd-zen2-17854255800.tar.zst to S3 bucket succeeded