forked from mirrors/nixpkgs
270 lines
6.4 KiB
Bash
Executable file
270 lines
6.4 KiB
Bash
Executable file
#! /bin/sh -e
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url=$1
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rev=$2
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expHash=$3
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hashType=$NIX_HASH_ALGO
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deepClone=$NIX_PREFETCH_GIT_DEEP_CLONE
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leaveDotGit=$NIX_PREFETCH_GIT_LEAVE_DOT_GIT
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builder=
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if test -n "$deepClone"; then
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deepClone=true
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else
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deepClone=false
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fi
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if test "$leaveDotGit" != 1; then
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leaveDotGit=
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else
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leaveDotGit=true
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fi
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argi=0
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argfun=""
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for arg; do
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if test -z "$argfun"; then
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case $arg in
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--out) argfun=set_out;;
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--url) argfun=set_url;;
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--rev) argfun=set_rev;;
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--hash) argfun=set_hashType;;
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--deepClone) deepClone=true;;
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--no-deepClone) deepClone=false;;
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--leave-dotGit) leaveDotGit=true;;
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--builder) builder=true;;
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*)
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argi=$(($argi + 1))
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case $argi in
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1) url=$arg;;
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2) rev=$arg;;
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3) expHash=$arg;;
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*) exit 1;;
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esac
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;;
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esac
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else
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case $argfun in
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set_*)
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var=$(echo $argfun | sed 's,^set_,,')
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eval $var=$arg
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;;
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esac
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argfun=""
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fi
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done
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usage(){
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echo >&2 "syntax: nix-prefetch-git [options] [URL [REVISION [EXPECTED-HASH]]]
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Options:
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--out path Path where the output would be stored.
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--url url Any url understand by 'git clone'.
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--rev ref Any sha1 or references (such as refs/heads/master)
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--hash h Expected hash.
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--deepClone Clone submodules recursively.
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--no-deepClone Do not clone submodules.
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--leave-dotGit Keep the .git directories.
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--builder Clone as fetchgit does, but url, rev, and out option are mandatory.
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"
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exit 1
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}
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if test -z "$url"; then
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usage
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fi
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init_remote(){
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local url=$1;
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git init;
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git remote add origin $url;
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}
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# Return the reference of an hash if it exists on the remote repository.
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ref_from_hash(){
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local hash=$1;
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git ls-remote origin | sed -n "\,$hash\t, { s,\(.*\)\t\(.*\),\2,; p; q}"
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}
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# Return the hash of a reference if it exists on the remote repository.
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hash_from_ref(){
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local ref=$1
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git ls-remote origin | sed -n "\,\t$ref, { s,\(.*\)\t\(.*\),\1,; p; q}"
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}
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# Fetch everything and checkout the right sha1
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checkout_hash(){
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local hash="$1";
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local ref="$2";
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if test -z "$hash"; then
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hash=$(hash_from_ref $ref);
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fi;
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git fetch ${builder:+--progress} origin || return 1
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git checkout -b fetchgit $hash || return 1
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}
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# Fetch only a branch/tag and checkout it.
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checkout_ref(){
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local hash="$1";
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local ref="$2";
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if "$deepClone"; then
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# The caller explicitly asked for a deep clone. Deep clones
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# allow "git describe" and similar tools to work. See
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# http://thread.gmane.org/gmane.linux.distributions.nixos/3569
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# for a discussion.
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return 1
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fi
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if test -z "$ref"; then
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ref=$(ref_from_hash $hash);
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fi;
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if test -n "$ref"; then
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# --depth option is ignored on http repository.
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git fetch ${builder:+--progress} --depth 1 origin +"$ref" || return 1
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git checkout -b fetchgit FETCH_HEAD || return 1
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else
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return 1;
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fi;
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}
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# Update submodules
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init_submodules(){
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# Add urls into .git/config file
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git submodule init
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# list submodule directories and their hashes
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git submodule status |
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while read l; do
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# checkout each submodule
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local hash=$(echo $l | sed 's,^-\([0-9a-f]*\) \(.*\)$,\1,');
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local dir=$(echo $l | sed 's,^-\([0-9a-f]*\) \(.*\)$,\2,');
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local url=$(sed -n "\,$dir, { :loop; n; s,^.*url = ,,; T loop; p; q }" .git/config);
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clone "$dir" "$url" "$hash" "";
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done;
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}
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clone(){
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local top=$(pwd)
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local dir="$1"
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local url="$2"
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local hash="$3"
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local ref="$4"
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cd $dir;
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# Initialize the repository.
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init_remote "$url";
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# Download data from the repository.
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checkout_ref "$hash" "$ref" ||
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checkout_hash "$hash" "$ref" || (
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echo 1>&2 "Unable to checkout $hash$ref from $url.";
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exit 1;
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)
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# Checkout linked sources.
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init_submodules;
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if [ -z "$builder" -a -f .topdeps ]; then
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if tg help 2>&1 > /dev/null
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then
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echo "populating TopGit branches..."
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tg remote --populate origin
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else
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echo "WARNING: would populate TopGit branches but TopGit is not available" >&2
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echo "WARNING: install TopGit to fix the problem" >&2
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fi
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fi
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cd $top;
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}
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clone_user_rev() {
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local dir="$1"
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local url="$2"
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local rev="$3"
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# Perform the checkout.
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case "$rev" in
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HEAD|refs/*)
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clone "$dir" "$url" "" "$rev" 1>&2;;
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[0-9a-f]*)
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if test -z "$(echo $rev | tr -d 0123456789abcdef)"; then
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clone "$dir" "$url" "$rev" "" 1>&2;
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else
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echo 1>&2 "Bad commit hash or bad reference.";
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exit 1;
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fi;;
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"")
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clone "$dir" "$url" "" "HEAD" 1>&2;;
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esac
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# Allow doing additional processing before .git removal
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eval "$NIX_PREFETCH_GIT_CHECKOUT_HOOK"
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if test -z "$leaveDotGit"; then
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echo "removing \`.git'..." >&2
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find $dir -name .git\* | xargs rm -rf
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fi
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}
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if test -n "$builder"; then
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test -n "$out" -a -n "$url" -a -n "$rev" || usage
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mkdir $out
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clone_user_rev "$out" "$url" "$rev"
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else
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if test -z "$hashType"; then
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hashType=sha256
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fi
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# If the hash was given, a file with that hash may already be in the
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# store.
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if test -n "$expHash"; then
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finalPath=$(nix-store --print-fixed-path --recursive "$hashType" "$expHash" git-export)
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if ! nix-store --check-validity "$finalPath" 2> /dev/null; then
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finalPath=
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fi
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hash=$expHash
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fi
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# If we don't know the hash or a path with that hash doesn't exist,
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# download the file and add it to the store.
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if test -z "$finalPath"; then
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tmpPath=/tmp/git-checkout-tmp-$$
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tmpFile=$tmpPath/git-export
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mkdir $tmpPath $tmpFile
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trap "rm -rf $tmpPath" EXIT
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# Perform the checkout.
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clone_user_rev "$tmpFile" "$url" "$rev"
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# Compute the hash.
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hash=$(nix-hash --type $hashType $hashFormat $tmpFile)
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if ! test -n "$QUIET"; then echo "hash is $hash" >&2; fi
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# Add the downloaded file to the Nix store.
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finalPath=$(nix-store --add-fixed --recursive "$hashType" $tmpFile)
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if test -n "$expHash" -a "$expHash" != "$hash"; then
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echo "hash mismatch for URL \`$url'"
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exit 1
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fi
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fi
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if ! test -n "$QUIET"; then echo "path is $finalPath" >&2; fi
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echo $hash
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if test -n "$PRINT_PATH"; then
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echo $finalPath
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fi
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fi
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