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{
"cells": [
{
"cell_type": "markdown",
"id": "0b397cbb-8db3-40d9-a0a9-27ba0a774021",
"metadata": {},
"source": [
"## Automatically creating new binhost directories when profile or gcc version changes"
]
},
{
"cell_type": "markdown",
"id": "97c6e8be-a571-4fea-84c4-b226f03f56c6",
"metadata": {},
"source": [
"On Gentoo Linux packages are compiled which is a time and energy consuming.\n",
"To minimise both, I have a binhost to share compiled binaries between devices.\n",
"The issues occurs when gcc major version changes - or a profile bump happens.\n",
"If I do not notice either - problem. Binaries might not be compatible.\n",
"So I wanted to automate a process of detection of those changes and automatically create subfolder for new binaries.\n",
"When investigating I learned a neat trick. For the wise ones this is trivial, for me it was enligtening.\n",
"Here it comes."
]
},
{
"cell_type": "markdown",
"id": "2a688afd-5f24-4eab-a1c7-119d372367b5",
"metadata": {},
"source": [
"On a regular system, emerge resides here:"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "b1098db8-2f77-4b56-acef-f58113107dad",
"metadata": {},
"outputs": [],
"source": [
"$ which emerge\n",
"/usr/bin/emerge"
]
},
{
"cell_type": "markdown",
"id": "9a1dcd6c-3f8c-455f-9d56-21e5157d0846",
"metadata": {},
"source": [
"On my box with binhost:"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "bcb9918c-20fb-49fd-baaf-b3b63356de5a",
"metadata": {},
"outputs": [],
"source": [
"$ which emerge\n",
"/usr/local/bin/emerge"
]
},
{
"cell_type": "markdown",
"id": "a84cf35c-e744-47c9-9500-d9b8c7d3bfef",
"metadata": {},
"source": [
"And here is $PATH:"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "94092561-ae6b-41eb-831a-71bffcf30e6e",
"metadata": {},
"outputs": [],
"source": [
"$ echo $PATH\n",
"/usr/local/sbin:/usr/local/bin:/usr/bin:/opt/bin:/usr/lib/llvm/18/bin:/usr/lib/llvm/17/bin"
]
},
{
"cell_type": "markdown",
"id": "eb05de7d-f2f3-4cd3-acc2-769e096a3a5b",
"metadata": {},
"source": [
"So we see that on binhost box, there is emerge that resides in location preceeding regular emerge - so it gets called first.\n",
"It contains a shell script as follows:"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "b9f78265-a1de-47eb-be21-bb66c1ed3bed",
"metadata": {},
"outputs": [],
"source": [
"#!/usr/bin/env bash\n",
"#\n",
"# Script checking that binhost path exists before running emerge and\n",
"# creating it if not exists\n",
"\n",
"PROFILE=$(eselect profile show|sed -n 2p|cut -d '/' -f4)\n",
"GCC_VERSION=$(eselect gcc show|cut -d '-' -f5)\n",
"BINHOST_DIR=\"/var/cache/binpkgs/${PROFILE}/gcc-${GCC_VERSION}.x/armv8a\"\n",
"\n",
"if [ ! -d \"${BINHOST_DIR}\" ]; then\n",
" echo \"${BINHOST_DIR} does not exist, creating\"\n",
" mkdir -p \"${BINHOST_DIR}\"\n",
"else echo \"Binhost directory ${BINHOST_DIR} exists, proceeding with emerge ...\"\n",
"fi\n",
"\n",
"PKGDIR=\"${BINHOST_DIR}\" /usr/bin/emerge \"$@\""
]
},
{
"cell_type": "markdown",
"id": "d6d085ea-b68f-4220-adaf-00223393e58e",
"metadata": {},
"source": [
"So on every profile change subfolder to /var/cache/binpkgs gets created,\n",
"on every gcc major version change, subfolder to /var/cache/binpkgs/<profile> gets created.\n",
"If folder already exists script only prints a message.\n",
"Then it calls /usr/bin/emerge - the regular emerge - with $PKGDIR variable, so binary packages are saved to the correct directory. "
]
},
{
"cell_type": "markdown",
"id": "1d464645-b7ac-4cbc-b5cc-1bd4bd976f06",
"metadata": {},
"source": [
"This is structure of /var/cache/binpkgs:"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "dee2b348-d16d-4709-a7cd-ac9424934009",
"metadata": {},
"outputs": [],
"source": [
"$ tree -L 3 /var/cache/binpkgs/\n",
"/var/cache/binpkgs/\n",
"├── 17.0\n",
"│ └── gcc-13.x\n",
"│ └── armv8a\n",
"└── 23.0\n",
" ├── gcc-13.x\n",
" │ └── armv8a\n",
" └── gcc-14.x\n",
" └── armv8a"
]
},
{
"cell_type": "markdown",
"id": "9f8f4a71-9fd1-4678-9cb0-a580c94f4582",
"metadata": {},
"source": [
"One less thing to worry about."
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3 (ipykernel)",
"language": "python",
"name": "python3"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 3
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.12.7"
}
},
"nbformat": 4,
"nbformat_minor": 5
}
|
