GitUpdate

#!/bin/bash
#
# Copy built packages from old repo to new repo
# and if changed, transfer to github.

echo1() { echo "$@" ; }        # for "return" values from functions (output to stdout)
echo2() { echo "$@" >&2 ; }    # output to stderr
read2() { read "$@" >&2 ; }    # output to stderr

DIE() {
    echo2 "Error: $1"
    exit 1
}

_date() {
    date -Ru | tr -d ',' | awk '{print $1,$3,$2,$5,"UTC",$4}'
}

StateUpdate() {
    local statefile=state
    local stateval="$(head -n 1 $statefile)"
    if [ -n "$(echo "$stateval" | awk '{print $2}')" ] ; then
        DIE "file $PWD/state file is corrupted!"
    fi
    #Random ID generator, because the incrementing value is predictable
    local NEW_UUID="$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1)"

    echo $((stateval+1))                       > $statefile
    echo "$NEW_UUID"                          >> $statefile
    _date >> $statefile
}

GetRepoName() {
    local xx
    reponame="$(basename "$PWD")"
    case "$reponame" in
        repo | eos-tools)
            reponame="$(/usr/bin/ls -1F | grep "/$" | tr -d '/')" ;;
    esac
    case "$(echo "$reponame" | wc -l)" in
        0) return 1 ;;
        1) echo1 "$reponame" ;;
        *)
            echo2 "Potential repo names:"
            while true ; do
                echo2 "$reponame" | sed 's|^|    |'
                read2 -p "Select reponame: "
                if [ -n "$REPLY" ] && [ -n "$(echo "$reponame" | grep "^$REPLY$")" ]; then
                    echo1 "$REPLY"
                    return
                fi
                echo2 "sorry, '$REPLY' is none of the above!"
            done
            ;;
    esac
}

CreateExcludes() {
    local xx
    local files="$(/usr/bin/ls -1a "$srcdir")"

    for xx in $files ; do
        case "$xx" in
            *.sig | *.xz | *.zst | *.db | *.files) ;;  # these we want to diff
            . | ..) ;;                                 # not directories
            *) excludes+=" -x $xx" ;;                  # not these files/dirs either
        esac
    done
}

CheckDiff() {
    case "$reponame" in
        "")
            DIE "cannot determine reponame!"
            ;;
        endeavouros)
            statefile="$PWD/state"
            test -r "$statefile" && has_statefile=yes || DIE "file '$statefile' is missing!"

            srcdir="$ASSETSDIR"
            dstdir="$PWD/$reponame/x86_64"
            git_adds="$reponame state"
            ;;
        endeavouros-testing-dev)                           # was eos-tools
            #srcdir="$PWD/../_BUILD_/repo-testing.x86_64"
            srcdir="$ASSETSDIR"
            dstdir="$PWD/$reponame"                        # was endeavouros-pkgtools
            git_adds="$(basename "$dstdir")"
            ;;
        *)
            if true ; then
                statefile="$PWD/state"
                test -r "$statefile" && has_statefile=yes || DIE "file '$statefile' is missing!"
            fi
            srcdir="$ASSETSDIR"
            dstdir="$PWD/repo"
            if [ $has_statefile = yes ] ; then
                git_adds="$(basename "$dstdir") state"
            else
                git_adds="$(basename "$dstdir")"
            fi
            ;;
    esac

    test -d "$gitdir"/.git          || DIE "folder '$gitdir/.git' not found!"
    test -r "$srcdir"/$reponame.db  || DIE "db file '$srcdir/$reponame.db' not found!"
    test -d "$dstdir"               || DIE "folder '$dstdir' not found!"

    local excludes=""
    CreateExcludes

    LANG=C diff "$srcdir" "$dstdir" $excludes > $file_x86_64_diff
    diff_x86_64=$?
    case "$diff_x86_64" in
        2) DIE "'diff $srcdir $dstdir' failed." ;;
    esac

    # ARM news check!
    if [ "$reponame" = "endeavouros" ] && [ "$handle_also_arm" = "yes" ] ; then
        ArmPkgCheck check $file_arm_diff
        diff_arm=$?
        case "$diff_arm" in
            2) DIE "ArmPkgCheck check failed." ;;
        esac
    fi
}

ReplaceAssets() {
    case "$reponame" in
        endeavouros)
            if [ $diff_arm -eq 1 ] ; then
                ArmPkgCheck copy || DIE "ArmPkgCheck copy failed."
            fi
            if [ $diff_x86_64 -eq 1 ] ; then
                rm -f "$dstdir"/*.{db,files,sig,xz,zst}
                cp -p "$srcdir"/*.{db,files,sig,xz,zst} "$dstdir"
            fi
            ;;
        *)
            rm -f "$dstdir"/*.{db,files,sig,xz,zst}
            cp -p "$srcdir"/*.{db,files,sig,xz,zst} "$dstdir"
            ;;
    esac
}

MirrorStateUpdate() {
    cd "$gitdir"
    if [ "$has_statefile" = "yes" ] ; then
        StateUpdate
    fi
}

RunOnlyIfAllowed() {
    local cmd="$1"
    while true ; do
        read2 -p "Run '$cmd' at $PWD now (y/n)? "
        case "$REPLY" in
            [yY]*)
                $cmd || DIE "'$cmd' failed."
                break
                ;;
            [nN]*)
                break
                ;;
        esac
    done
}

GitUpdate() {
    if false && [ "$reponame" = "endeavouros" ] ; then
	local file
	printf2 "==> You need to transfer the following files to github:"
	for file in $git_adds ; do
	    printf "       %s\n" "$file"
	done
	echo2 "==> Commands 'cd $gitdir ; git push', or use the browser for the same."
	return
    fi

    local commit_msg="$1"

    cd "$gitdir"
    echo2 ""
    echo2 "Adding files to github."
    echo2 ""
    # RunOnlyIfAllowed "git pull"
    git add $git_adds
    #git commit -m "."          # dummy commit message
    git commit -m "$commit_msg"
    echo2 ""
    git push || {
        echo2 "You should run commands 'cd $PWD ; git push'"
    }
}

GetArmCommitMessage() {
    # Manually given Arm commits may not have the message, so get it from the github commit messages, or actual commits.

    # Get commit message from github arm commit message.
    local data=$(curl -Lsm 10 -o- https://github.com/endeavouros-arm/repo/commits/master/endeavouros)
    local commit_msg=$(echo "$data" | grep -w "open markdown-title" | head -n1 | sed -e 's|.*">\([^<]*\)</a>|\1|')

    if [ -z "$commit_msg" ] ; then
        # Show actual committed packages from the github ARM page.
        local commit=$(echo "$data" | grep -w "open markdown-title" | head -n1 | sed -e 's|.*/repo/commit/\(.*\)">.*|\1|')
        data=$(curl -Lsm 10 -o- "https://github.com/endeavouros-arm/repo/commit/$commit")
        readarray -t data <<< $(echo "$data" | grep "pkg.tar.zst<" | grep -w "a href" | sed 's|.*>endeavouros/\(.*\)</a>|\1|')
        commit_msg="Updated"
        for ((ix=1; ix < ${#data[@]}; ix=ix+2)) ; do
            commit_msg+=" ${data[ix]}"
        done
    fi
    echo "$commit_msg"
}

Main()
{
    local commit_msg="$1"
    local ASSETSDIR="$2"
    local commit_msg_arm=""
    local handle_also_arm=no          # yes or no; will be no later

    # [ -f .GitUpdate ] || DIE "no .GitUpdate file in folder $PWD"
    [ -d .git ]       || DIE "no .git folder in $PWD"
    [ -L .git ]       && DIE ".git must not be symlink in $PWD"

    local gitdir="$PWD"                     # has .git folder
    local reponame="$(GetRepoName)"
    local has_statefile=no
    local srcdir=""
    local dstdir=""
    local git_adds=""
    local statefile=""
    local diff_x86_64=0                     # 1 = has updates
    local diff_arm=0                        # 1 = has updates
    local file_arm_diff=/tmp/diffs_arm.txt
    local file_x86_64_diff=/tmp/diffs_x86_64.txt

    CheckDiff

    if [ $diff_x86_64 -ne 0 ] ; then
        echo2 "==> x86_64 diffs:"
        cat $file_x86_64_diff >&2
        rm -f $file_x86_64_diff
    fi
    if [ $diff_arm -ne 0 ] ; then
        echo2 "==> ARM diffs:"
        cat $file_arm_diff >&2
        rm -f $file_arm_diff
    fi

    if [ $diff_x86_64 -ne 0 ] || [ $diff_arm -ne 0 ] ; then
        printf2 "\nChanges detected and shown above.\nWill replace local assets after 'git pull', then sync all to github.\n\n"
        read2 -p "Continue (Y/n)? "
        case "$REPLY" in
            [nN]*) DIE "aborted!";;
        esac

        # x86_64 always should have a commit message, but Arm may not have it.
        if [ $diff_arm -ne 0 ] ; then
            if [ -n "$commit_msg" ] ; then
                echo2 "Current commit message: '$commit_msg'"
            fi
            read2 -p "A commit message for ARM changes is required. Get it automatically (Y/n)? "
            case "$REPLY" in
                [Yy]* | "")
                    commit_msg_arm="ARM: $(GetArmCommitMessage)"
                    printf2 "==> Commit message for ARM:\n    %s\n" "$commit_msg_arm"
                    read2 -p "OK to continue (Y/n)? "
                    case "$REPLY" in
                        [nN]*) DIE "aborted!" ;;
                    esac
                    ;;
                *)
                    DIE "no commit message for ARM changes."
                    ;;
            esac
            if [ -n "$commit_msg" ] ; then
                commit_msg+=", $commit_msg_arm"
            else
                commit_msg="$commit_msg_arm"
            fi
        fi
        if [ -z "$commit_msg" ] ; then
            read2 -p "Commit message is still empty. Give it now: " commit_msg
        fi
        if [ -z "$commit_msg" ] ; then
            DIE "cannot continue without a commit message!"
        fi

        cd "$gitdir"
        RunOnlyIfAllowed "git pull"

        if [ $has_statefile = yes ] && [ $diff_x86_64 -ne 0 ] ; then
            MirrorStateUpdate
        fi

        ReplaceAssets
        GitUpdate "$commit_msg"
    else
        echo2 "No changes."
    fi
}

Main "$@"